Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
ZSHCOMPSYS(1)		    General Commands Manual		 ZSHCOMPSYS(1)

NAME
       zshcompsys - zsh	completion system

DESCRIPTION
       This describes the shell	code for the `new' completion system, referred
       to as compsys.  It is written in	shell functions	based on the  features
       described in zshcompwid(1).

       The features are	contextual, sensitive to the point at which completion
       is started.  Many completions are already provided.  For	this reason, a
       user  can perform a great many tasks without knowing any	details	beyond
       how to initialize the system, which is described	below  in  INITIALIZA-
       TION.

       The context that	decides	what completion	is to be performed may be
       o      an  argument  or option position:	these describe the position on
	      the command line at which	completion is requested.  For  example
	      `first  argument	to rmdir, the word being completed names a di-
	      rectory';

       o      a	special	context, denoting an element in	 the  shell's  syntax.
	      For  example  `a	word  in  command  position' or	`an array sub-
	      script'.

       A full context specification contains other elements, as	we  shall  de-
       scribe.

       Besides	commands  names	and contexts, the system employs two more con-
       cepts, styles and tags.	These provide ways for the user	 to  configure
       the system's behaviour.

       Tags  play  a dual role.	 They serve as a classification	system for the
       matches,	typically indicating a class of	object that the	user may  need
       to  distinguish.	 For example, when completing arguments	of the ls com-
       mand the	user may prefer	to try files before directories,  so  both  of
       these are tags.	They also appear as the	rightmost element in a context
       specification.

       Styles modify various operations	of the completion system, such as out-
       put formatting, but also	what kinds of completers are used (and in what
       order), or which	tags are examined.  Styles may	accept	arguments  and
       are  manipulated	 using	the  zstyle  command  described	in see zshmod-
       ules(1).

       In summary, tags	describe what the completion objects  are,  and	 style
       how they	are to be completed.  At various points	of execution, the com-
       pletion system checks what styles and/or	tags are defined for the  cur-
       rent  context, and uses that to modify its behavior.  The full descrip-
       tion of context handling, which determines how tags and other  elements
       of the context influence	the behaviour of styles, is described below in
       COMPLETION SYSTEM CONFIGURATION.

       When a completion is requested, a dispatcher function  is  called;  see
       the  description	of _main_complete in the list of control functions be-
       low. This dispatcher decides which function should be called to produce
       the completions,	and calls it. The result is passed to one or more com-
       pleters,	functions that	implement  individual  completion  strategies:
       simple  completion, error correction, completion	with error correction,
       menu selection, etc.

       More generally, the shell functions contained in	the completion	system
       are of two types:
       o      those beginning `comp' are to be called directly;	there are only
	      a	few of these;

       o      those beginning `_' are called  by  the  completion  code.   The
	      shell  functions	of this	set, which implement completion	behav-
	      iour and may be bound to keystrokes, are referred	 to  as	 `wid-
	      gets'.  These proliferate	as new completions are required.

INITIALIZATION
       If the system was installed completely, it should be enough to call the
       shell function compinit from your initialization	 file;	see  the  next
       section.	  However,  the	 function  compinstall can be run by a user to
       configure various aspects of the	completion system.

       Usually,	compinstall will insert	code into .zshrc, although if that  is
       not  writable  it will save it in another file and tell you that	file's
       location.  Note that it is up to	you to make sure that the lines	 added
       to  .zshrc are actually run; you	may, for example, need to move them to
       an earlier place	in the file if .zshrc usually returns early.  So  long
       as you keep them	all together (including	the comment lines at the start
       and finish), you	can rerun compinstall and it will correctly locate and
       modify  these lines.  Note, however, that any code you add to this sec-
       tion by hand is likely to be lost if you	 rerun	compinstall,  although
       lines using the command `zstyle'	should be gracefully handled.

       The  new	 code  will  take effect next time you start the shell,	or run
       .zshrc by hand; there is	also an	option to make them take effect	 imme-
       diately.	  However,  if	compinstall  has removed definitions, you will
       need to restart the shell to see	the changes.

       To run compinstall you will need	to make	sure it	is in a	directory men-
       tioned in your fpath parameter, which should already be the case	if zsh
       was properly configured as long as your startup files do	not remove the
       appropriate  directories	 from fpath.  Then it must be autoloaded (`au-
       toload -U compinstall' is recommended).	You can	abort the installation
       any  time  you are being	prompted for information, and your .zshrc will
       not be altered at all; changes only take	place right at the end,	 where
       you are specifically asked for confirmation.

   Use of compinit
       This section describes the use of compinit to initialize	completion for
       the current session when	called directly; if you	have  run  compinstall
       it will be called automatically from your .zshrc.

       To  initialize  the system, the function	compinit should	be in a	direc-
       tory mentioned in the fpath parameter, and should be  autoloaded	 (`au-
       toload -U compinit' is recommended), and	then run simply	as `compinit'.
       This will define	a few utility functions, arrange for all the necessary
       shell  functions	 to be autoloaded, and will then re-define all widgets
       that do completion to use the new system.  If you use  the  menu-select
       widget,	which is part of the zsh/complist module, you should make sure
       that that module	is loaded before the call to  compinit	so  that  that
       widget is also re-defined.  If completion styles	(see below) are	set up
       to perform expansion as well as completion by default, and the TAB  key
       is  bound  to  expand-or-complete,  compinit  will  rebind  it  to com-
       plete-word; this	is necessary to	use the	correct	form of	expansion.

       Should you need to use the original completion commands,	you can	 still
       bind  keys  to  the old widgets by putting a `.'	in front of the	widget
       name, e.g. `.expand-or-complete'.

       To speed	up the running of compinit, it can be made to produce a	dumped
       configuration  that  will be read in on future invocations; this	is the
       default,	but can	be turned off by calling compinit with the option  -D.
       The  dumped  file  is  .zcompdump  in the same directory	as the startup
       files (i.e. $ZDOTDIR or $HOME); alternatively, an  explicit  file  name
       can  be	given  by  `compinit  -d  dumpfile'.   The  next invocation of
       compinit	will read the dumped file instead of performing	 a  full  ini-
       tialization.

       If the number of	completion files changes, compinit will	recognise this
       and produce a new dump file.  However, if the name of a function	or the
       arguments in the	first line of a	#compdef function (as described	below)
       change, it is easiest to	delete the dump	file by	hand so	that  compinit
       will  re-create it the next time	it is run.  The	check performed	to see
       if there	are new	functions can be omitted by giving the option -C.   In
       this  case  the	dump  file will	only be	created	if there isn't one al-
       ready.

       The dumping is actually done by another	function,  compdump,  but  you
       will  only  need	 to  run this yourself if you change the configuration
       (e.g. using compdef) and	then want to dump the new one.	 The  name  of
       the old dumped file will	be remembered for this purpose.

       If the parameter	_compdir is set, compinit uses it as a directory where
       completion functions can	be found; this is only necessary if  they  are
       not already in the function search path.

       For  security  reasons  compinit	 also  checks if the completion	system
       would use files not owned by root or by the current user, or  files  in
       directories  that are world- or group-writable or that are not owned by
       root or by the current user.  If	such files or directories  are	found,
       compinit	 will  ask if the completion system should really be used.  To
       avoid these tests and make all files found be used without asking,  use
       the  option -u, and to make compinit silently ignore all	insecure files
       and directories use the option -i.  This	security check is skipped  en-
       tirely when the -C option is given.

       The  security  check can	be retried at any time by running the function
       compaudit.  This	is the same check used by compinit, but	when it	is ex-
       ecuted  directly	any changes to fpath are made local to the function so
       they do not persist.  The directories to	be checked may	be  passed  as
       arguments; if none are given, compaudit uses fpath and _compdir to find
       completion system directories, adding missing ones to fpath  as	neces-
       sary.   To  force a check of exactly the	directories currently named in
       fpath, set _compdir to an empty	string	before	calling	 compaudit  or
       compinit.

       The  function  bashcompinit provides compatibility with bash's program-
       mable completion	system.	 When run it will define the functions,	 comp-
       gen  and	 complete  which correspond to the bash	builtins with the same
       names.  It will then be possible	to use completion  specifications  and
       functions written for bash.

   Autoloaded files
       The convention for autoloaded functions used in completion is that they
       start with an underscore; as already mentioned, the fpath/FPATH parame-
       ter  must  contain  the directory in which they are stored.  If zsh was
       properly	installed on your system, then fpath/FPATH automatically  con-
       tains the required directories for the standard functions.

       For  incomplete	installations,	if compinit does not find enough files
       beginning with an underscore (fewer than	twenty)	in the search path, it
       will  try  to  find more	by adding the directory	_compdir to the	search
       path.  If that directory	has a subdirectory named Base, all subdirecto-
       ries  will be added to the path.	 Furthermore, if the subdirectory Base
       has a subdirectory named	Core, compinit will add	all subdirectories  of
       the  subdirectories to the path:	this allows the	functions to be	in the
       same format as in the zsh source	distribution.

       When compinit is	 run,  it  searches  all  such	files  accessible  via
       fpath/FPATH and reads the first line of each of them.  This line	should
       contain one of the tags described below.	 Files whose first  line  does
       not  start  with	one of these tags are not considered to	be part	of the
       completion system and will not be treated specially.

       The tags	are:

       #compdef	name ... [ -{p|P} pattern ... [	-N name	... ] ]
	      The file will be made autoloadable and the function  defined  in
	      it will be called	when completing	names, each of which is	either
	      the name of a command whose arguments are	to be completed	or one
	      of  a number of special contexts in the form -context- described
	      below.

	      Each name	may also be of the form	`cmd=service'.	When  complet-
	      ing  the	command	 cmd, the function typically behaves as	if the
	      command (or special context) service  was	 being	completed  in-
	      stead.   This  provides a	way of altering	the behaviour of func-
	      tions that can perform many different completions.  It is	imple-
	      mented  by setting the parameter $service	when calling the func-
	      tion; the	function may choose to interpret this how  it  wishes,
	      and simpler functions will probably ignore it.

	      If  the  #compdef	line contains one of the options -p or -P, the
	      words following are taken	to be patterns.	 The function will  be
	      called  when  completion	is  attempted for a command or context
	      that matches one of the patterns.	 The options  -p  and  -P  are
	      used  to specify patterns	to be tried before or after other com-
	      pletions respectively.  Hence -P may be used to specify  default
	      actions.

	      The option -N is used after a list following -p or -P; it	speci-
	      fies that	remaining words	no longer define patterns.  It is pos-
	      sible  to	toggle between the three options as many times as nec-
	      essary.

       #compdef	-k style key-sequence ...
	      This option creates a widget behaving like  the  builtin	widget
	      style  and  binds	 it  to	 the given key-sequences, if any.  The
	      style must be one	of the builtin widgets	that  perform  comple-
	      tion,  namely complete-word, delete-char-or-list,	expand-or-com-
	      plete, expand-or-complete-prefix,	 list-choices,	menu-complete,
	      menu-expand-or-complete,	 or   reverse-menu-complete.   If  the
	      zsh/complist module is loaded  (see  zshmodules(1))  the	widget
	      menu-select is also available.

	      When one of the key-sequences is typed, the function in the file
	      will be invoked to generate the matches.	Note that a  key  will
	      not  be  re-bound	if it already was (that	is, was	bound to some-
	      thing other than undefined-key).	The  widget  created  has  the
	      same  name  as the file and can be bound to any other keys using
	      bindkey as usual.

       #compdef	-K widget-name style key-sequence [ name style seq ... ]
	      This is similar to -k except that	only one key-sequence argument
	      may  be given for	each widget-name style pair.  However, the en-
	      tire set of three	arguments may be repeated with a different set
	      of  arguments.   Note in particular that the widget-name must be
	      distinct in each set.  If	it does	not begin with `_'  this  will
	      be added.	 The widget-name should	not clash with the name	of any
	      existing widget: names based on the name	of  the	 function  are
	      most useful.  For	example,

		     #compdef -K _foo_complete complete-word "^X^C" \
		       _foo_list list-choices "^X^D"

	      (all on one line)	defines	a widget _foo_complete for completion,
	      bound to `^X^C', and a widget _foo_list for  listing,  bound  to
	      `^X^D'.

       #autoload [ options ]
	      Functions	 with the #autoload tag	are marked for autoloading but
	      are not otherwise	treated	specially.  Typically they are	to  be
	      called from within one of	the completion functions.  Any options
	      supplied will be passed to the autoload builtin; a  typical  use
	      is +X to force the function to be	loaded immediately.  Note that
	      the -U and -z flags are always added implicitly.

       The # is	part of	the tag	name and no white space	is allowed  after  it.
       The  #compdef  tags  use	the compdef function described below; the main
       difference is that the name of the function is supplied implicitly.

       The special contexts for	which completion functions can be defined are:

       -array-value-
	      The right	hand side of an	array-assignment (`name=(...)')

       -brace-parameter-
	      The name of a parameter expansion	within braces (`${...}')

       -assign-parameter-
	      The name of a parameter in an assignment,	i.e. on	the left  hand
	      side of an `='

       -command-
	      A	word in	command	position

       -condition-
	      A	word inside a condition	(`[[...]]')

       -default-
	      Any word for which no other completion is	defined

       -equal-
	      A	word beginning with an equals sign

       -first-
	      This  is	tried before any other completion function.  The func-
	      tion called may set the _compskip	parameter to  one  of  various
	      values:  all:  no	further	completion is attempted; a string con-
	      taining the substring patterns: no pattern completion  functions
	      will  be	called;	 a string containing default: the function for
	      the `-default-' context will not be called,  but	functions  de-
	      fined for	commands will be.

       -math- Inside mathematical contexts, such as `((...))'

       -parameter-
	      The name of a parameter expansion	(`$...')

       -redirect-
	      The word after a redirection operator.

       -subscript-
	      The contents of a	parameter subscript.

       -tilde-
	      After  an	initial	tilde (`~'), but before	the first slash	in the
	      word.

       -value-
	      On the right hand	side of	an assignment.

       Default implementations are supplied for	each of	 these	contexts.   In
       most  cases  the	 context  -context-  is	implemented by a corresponding
       function	_context, for example the context `-tilde-' and	 the  function
       `_tilde').

       The contexts -redirect- and -value- allow extra context-specific	infor-
       mation.	(Internally, this is handled by	the functions for each context
       calling	the function _dispatch.)  The extra information	is added sepa-
       rated by	commas.

       For the -redirect- context, the extra information is in the form	 `-re-
       direct-,op,command',  where  op is the redirection operator and command
       is the name of the command on the line.	If there is no command on  the
       line yet, the command field will	be empty.

       For the -value- context,	the form is `-value-,name,command', where name
       is the name of the parameter on the left	hand side of  the  assignment.
       In  the	case  of  elements  of	an associative array, for example `as-
       soc=(key	<TAB>',	name is	expanded to `name-key'.	  In  certain  special
       contexts,  such	as  completing	after `make CFLAGS=', the command part
       gives the name of the command, here make; otherwise it is empty.

       It is not necessary to define fully specific completions	as  the	 func-
       tions  provided	will  try to generate completions by progressively re-
       placing the elements with `-default-'.  For  example,  when  completing
       after  `foo=<TAB>',  _value will	try the	names `-value-,foo,' (note the
       empty command part), `-value-,foo,-default-' and`-value-,-default-,-de-
       fault-',	 in  that  order, until	it finds a function to handle the con-
       text.

       As an example:

	      compdef '_files -g "*.log"' '-redirect-,2>,-default-'

       completes files matching	`*.log'	after `2> <TAB>' for any command  with
       no more specific	handler	defined.

       Also:

	      compdef _foo -value-,-default-,-default-

       specifies  that	_foo provides completions for the values of parameters
       for which no special function has been defined.	This is	 usually  han-
       dled by the function _value itself.

       The same	lookup rules are used when looking up styles (as described be-
       low); for example

	      zstyle ':completion:*:*:-redirect-,2>,*:*' file-patterns '*.log'

       is another way to make  completion  after  `2>  <TAB>'  complete	 files
       matching	`*.log'.

   Functions
       The  following  function	 is  defined by	compinit and may be called di-
       rectly.

       compdef [ -ane ]	function name ... [ -{p|P} pattern ... [ -N name ...]]
       compdef -d name ...
       compdef -k [ -an	] function style key-sequence [	key-sequence ... ]
       compdef -K [ -an	] function name	style key-seq [	name style seq ... ]
	      The first	form defines the function to call  for	completion  in
	      the given	contexts as described for the #compdef tag above.

	      Alternatively,  all  the	arguments  may have the	form `cmd=ser-
	      vice'.   Here  service  should  already  have  been  defined  by
	      `cmd1=service' lines in #compdef files, as described above.  The
	      argument for cmd will be completed in the	same way as service.

	      The function argument may	alternatively be a  string  containing
	      almost  any  shell  code.	 If the	string contains	an equal sign,
	      the above	will take precedence.  The option -e may  be  used  to
	      specify the first	argument is to be evaluated as shell code even
	      if it contains an	equal sign.  The string	will be	executed using
	      the eval builtin command to generate completions.	 This provides
	      a	way of avoiding	having to define a  new	 completion  function.
	      For  example,  to	 complete files	ending in `.h' as arguments to
	      the command foo:

		     compdef '_files -g	"*.h"' foo

	      The option -n prevents any completions already defined  for  the
	      command or context from being overwritten.

	      The  option -d deletes any completion defined for	the command or
	      contexts listed.

	      The names	may also contain -p, -P	and -N	options	 as  described
	      for  the #compdef	tag.  The effect on the	argument list is iden-
	      tical, switching between	definitions  of	 patterns  tried  ini-
	      tially,  patterns	 tried	finally,  and normal commands and con-
	      texts.

	      The parameter $_compskip may be set by any function defined  for
	      a	 pattern context.  If it is set	to a value containing the sub-
	      string `patterns'	none of	the pattern-functions will be  called;
	      if it is set to a	value containing the substring `all', no other
	      function will be called.	Setting	$_compskip in this  manner  is
	      of particular utility when using the -p option, as otherwise the
	      dispatcher will move on to additional functions (likely the  de-
	      fault one) after calling the pattern-context one,	which can man-
	      gle the display of completion possibilities if not handled prop-
	      erly.

	      The  form	 with  -k  defines  a widget with the same name	as the
	      function that will be called for each of the key-sequences; this
	      is  like	the #compdef -k	tag.  The function should generate the
	      completions needed and will otherwise behave  like  the  builtin
	      widget  whose  name is given as the style	argument.  The widgets
	      usable for this  are:  complete-word,  delete-char-or-list,  ex-
	      pand-or-complete,	   expand-or-complete-prefix,	 list-choices,
	      menu-complete,  menu-expand-or-complete,	and  reverse-menu-com-
	      plete,  as  well	as  menu-select	 if the	zsh/complist module is
	      loaded.  The option -n prevents the key being bound if it	is al-
	      ready to bound to	something other	than undefined-key.

	      The  form	 with -K is similar and	defines	multiple widgets based
	      on the same function, each of which requires the	set  of	 three
	      arguments	name, style and	key-sequence, where the	latter two are
	      as for -k	and the	first must be a	unique widget  name  beginning
	      with an underscore.

	      Wherever	applicable, the	-a option makes	the function autoload-
	      able, equivalent to autoload -U function.

       The function compdef can	be used	to associate existing completion func-
       tions with new commands.	 For example,

	      compdef _pids foo

       uses the	function _pids to complete process IDs for the command foo.

       Note  also the _gnu_generic function described below, which can be used
       to complete options for commands	that understand	the `--help' option.

COMPLETION SYSTEM CONFIGURATION
       This section gives a short overview of how the completion system	works,
       and  then  more	detail on how users can	configure how and when matches
       are generated.

   Overview
       When completion is attempted somewhere on the command line the  comple-
       tion system begins building the context.	 The context represents	every-
       thing that the shell knows about	the meaning of the  command  line  and
       the  significance of the	cursor position.  This takes account of	a num-
       ber of things including the command word	(such as `grep'	or `zsh')  and
       options	to which the current word may be an argument (such as the `-o'
       option to zsh which takes a shell option	as an argument).

       The context starts out very generic ("we	are beginning  a  completion")
       and becomes more	specific as more is learned ("the current word is in a
       position	that is	usually	a command name"	or "the	current	word might  be
       a  variable  name"  and so on).	Therefore the context will vary	during
       the same	call to	the completion system.

       This context information	is condensed into a string consisting of  mul-
       tiple  fields  separated	by colons, referred to simply as `the context'
       in the remainder	of the documentation.  Note that a user	of the comple-
       tion  system rarely needs to compose a context string, unless for exam-
       ple a new function is being written to perform  completion  for	a  new
       command.	  What a user may need to do is	compose	a style	pattern, which
       is matched against a context when needed	to look	 up  context-sensitive
       options that configure the completion system.

       The  next  few  paragraphs explain how a	context	is composed within the
       completion function suite.  Following that is discussion	of how	styles
       are  defined.  Styles determine such things as how the matches are gen-
       erated, similarly to shell options but with much	 more  control.	  They
       are defined with	the zstyle builtin command (see	zshmodules(1)).

       The  context string always consists of a	fixed set of fields, separated
       by colons and with a leading colon before the first.  Fields which  are
       not yet known are left empty, but the surrounding colons	appear anyway.
       The fields are always in	the order  :completion:function:completer:com-
       mand:argument:tag.  These have the following meaning:

       o      The literal string completion, saying that this style is used by
	      the completion system.   This  distinguishes  the	 context  from
	      those used by, for example, zle widgets and ZFTP functions.

       o      The function, if completion is called from a named widget	rather
	      than through the normal completion system.   Typically  this  is
	      blank,  but  it is set by	special	widgets	such as	predict-on and
	      the various functions in the Widget directory of	the  distribu-
	      tion to the name of that function, often in an abbreviated form.

       o      The completer currently active, the name of the function without
	      the leading underscore and with other underscores	 converted  to
	      hyphens.	 A `completer' is in overall control of	how completion
	      is to be performed; `complete' is	the simplest, but  other  com-
	      pleters exist to perform related tasks such as correction, or to
	      modify the behaviour of a	 later	completer.   See  the  section
	      `Control Functions' below	for more information.

       o      The command or a special -context-, just at it appears following
	      the #compdef tag or the compdef function.	 Completion  functions
	      for commands that	have sub-commands usually modify this field to
	      contain the name of the command followed by a minus sign and the
	      sub-command.   For  example, the completion function for the cvs
	      command sets this	field to cvs-add when completing arguments  to
	      the add subcommand.

       o      The  argument; this indicates which command line or option argu-
	      ment we are completing.  For command  arguments  this  generally
	      takes  the  form	argument-n, where n is the number of the argu-
	      ment, and	for arguments to options the form option-opt-n where n
	      is  the  number of the argument to option	opt.  However, this is
	      only the case if	the  command  line  is	parsed	with  standard
	      UNIX-style options and arguments,	so many	completions do not set
	      this.

       o      The tag.	As described previously, tags are used to discriminate
	      between  the types of matches a completion function can generate
	      in a certain context.  Any completion function may use  any  tag
	      name  it	likes, but a list of the more common ones is given be-
	      low.

       The context is gradually	put together as	the  functions	are  executed,
       starting	 with  the  main  entry	point, which adds :completion: and the
       function	element	if necessary.  The completer then adds	the  completer
       element.	  The  contextual completion adds the command and argument op-
       tions.  Finally,	the tag	is added when  the  types  of  completion  are
       known.  For example, the	context	name

	      :completion::complete:dvips:option-o-1:files

       says  that normal completion was	attempted as the first argument	to the
       option -o of the	command	dvips:

	      dvips -o ...

       and the completion function will	generate filenames.

       Usually completion will be tried	for all	 possible  tags	 in  an	 order
       given  by the completion	function.  However, this can be	altered	by us-
       ing the tag-order style.	 Completion is then restricted to the list  of
       given tags in the given order.

       The  _complete_help  bindable  command  shows all the contexts and tags
       available for completion	at a particular	point.	This provides an  easy
       way  of	finding	information for	tag-order and other styles.  It	is de-
       scribed in the section `Bindable	Commands' below.

       When looking up styles the completion system uses full  context	names,
       including  the tag.  Looking up the value of a style therefore consists
       of two things: the context, which is matched to the most	specific (best
       fitting)	style pattern, and the name of the style itself, which must be
       matched exactly.	 The following examples	demonstrate  that  style  pat-
       terns  may  be  loosely	defined	 for  styles that apply	broadly, or as
       tightly defined as desired for styles that apply	 in  narrower  circum-
       stances.

       For example, many completion functions can generate matches in a	simple
       and a verbose form and use the  verbose	style  to  decide  which  form
       should be used.	To make	all such functions use the verbose form, put

	      zstyle ':completion:*' verbose yes

       in  a startup file (probably .zshrc).  This gives the verbose style the
       value yes in every context inside the completion	 system,  unless  that
       context has a more specific definition.	It is best to avoid giving the
       context as `*' in case the style	has some meaning outside  the  comple-
       tion system.

       Many  such general purpose styles can be	configured simply by using the
       compinstall function.

       A more specific example of the use of the verbose style is by the  com-
       pletion	for  the kill builtin.	If the style is	set, the builtin lists
       full job	texts and process command lines; otherwise it shows  the  bare
       job numbers and PIDs.  To turn the style	off for	this use only:

	      zstyle ':completion:*:*:kill:*:*'	verbose	no

       For  even  more	control,  the  style can use one of the	tags `jobs' or
       `processes'.  To	turn off verbose display only for jobs:

	      zstyle ':completion:*:*:kill:*:jobs' verbose no

       The -e option to	zstyle even allows completion function code to	appear
       as the argument to a style; this	requires some understanding of the in-
       ternals of completion functions (see see	zshcompwid(1))).  For example,

	      zstyle -e	':completion:*'	hosts 'reply=($myhosts)'

       This forces the value of	the hosts style	to be read from	 the  variable
       myhosts each time a host	name is	needed;	this is	useful if the value of
       myhosts can change dynamically.	For another useful  example,  see  the
       example in the description of the file-list style below.	 This form can
       be slow and should be avoided for commonly examined styles such as menu
       and list-rows-first.

       Note  that  the	order in which styles are defined does not matter; the
       style mechanism uses the	most specific possible match for a  particular
       style to	determine the set of values.  More precisely, strings are pre-
       ferred over patterns  (for  example,  `:completion::complete:::foo'  is
       more  specific  than  `:completion::complete:::*'), and longer patterns
       are preferred over shorter patterns.

       A good rule of thumb is that any	completion style pattern that needs to
       include more than one wildcard (*) and that does	not end	in a tag name,
       should include all six  colons  (:),  possibly  surrounding  additional
       wildcards.

       Style  names like those of tags are arbitrary and depend	on the comple-
       tion function.  However,	the following two sections list	 some  of  the
       most common tags	and styles.

   Standard Tags
       Some  of	 the following are only	used when looking up particular	styles
       and do not refer	to a type of match.

       accounts
	      used to look up the users-hosts style

       all-expansions
	      used by the _expand completer when adding	the single string con-
	      taining all possible expansions

       all-files
	      for  the	names of all files (as distinct	from a particular sub-
	      set, see the globbed-files tag).

       arguments
	      for arguments to a command

       arrays for names	of array parameters

       association-keys
	      for keys of associative arrays; used when	 completing  inside  a
	      subscript	to a parameter of this type

       bookmarks
	      when  completing	bookmarks (e.g.	for URLs and the zftp function
	      suite)

       builtins
	      for names	of builtin commands

       characters
	      for single characters in arguments of  commands  such  as	 stty.
	      Also  used  when	completing  character classes after an opening
	      bracket

       colormapids
	      for X colormap ids

       colors for color	names

       commands
	      for names	of external commands.  Also used by  complex  commands
	      such as cvs when completing names	subcommands.

       contexts
	      for contexts in arguments	to the zstyle builtin command

       corrections
	      used  by	the  _approximate and _correct completers for possible
	      corrections

       cursors
	      for cursor names used by X programs

       default
	      used in some contexts to provide a way of	 supplying  a  default
	      when  more  specific tags	are also valid.	 Note that this	tag is
	      used when	only the function field	of the context name is set

       descriptions
	      used when	looking	up the value of	the format style  to  generate
	      descriptions for types of	matches

       devices
	      for names	of device special files

       directories
	      for  names  of  directories -- local-directories is used instead
	      when completing arguments	of cd  and  related  builtin  commands
	      when the cdpath array is set

       directory-stack
	      for entries in the directory stack

       displays
	      for X display names

       domains
	      for network domains

       email-plugin
	      for   email   addresses  from  the  `_email-plugin'  backend  of
	      _email_addresses

       expansions
	      used by the _expand completer for	individual words  (as  opposed
	      to  the complete set of expansions) resulting from the expansion
	      of a word	on the command line

       extensions
	      for X server extensions

       file-descriptors
	      for numbers of open file descriptors

       files  the generic file-matching	tag used by functions completing file-
	      names

       fonts  for X font names

       fstypes
	      for file system types (e.g. for the mount	command)

       functions
	      names of functions -- normally shell functions, although certain
	      commands may understand other kinds of function

       globbed-files
	      for filenames when the name has been generated by	pattern	match-
	      ing

       groups for names	of user	groups

       history-words
	      for words	from the history

       hosts  for hostnames

       indexes
	      for array	indexes

       jobs   for jobs (as listed by the `jobs'	builtin)

       interfaces
	      for network interfaces

       keymaps
	      for names	of zsh keymaps

       keysyms
	      for names	of X keysyms

       libraries
	      for names	of system libraries

       limits for system limits

       local-directories
	      for  names of directories	that are subdirectories	of the current
	      working directory	when completing	arguments of  cd  and  related
	      builtin  commands	 (compare path-directories) -- when the	cdpath
	      array is unset, directories is used instead

       manuals
	      for names	of manual pages

       mailboxes
	      for e-mail folders

       maps   for map names (e.g. NIS maps)

       messages
	      used to look up the format style for messages

       modifiers
	      for names	of X modifiers

       modules
	      for modules (e.g.	zsh modules)

       my-accounts
	      used to look up the users-hosts style

       named-directories
	      for named	directories (you wouldn't  have	 guessed  that,	 would
	      you?)

       names  for all kinds of names

       newsgroups
	      for USENET groups

       nicknames
	      for nicknames of NIS maps

       options
	      for command options

       original
	      used  by	the _approximate, _correct and _expand completers when
	      offering the original string as a	match

       other-accounts
	      used to look up the users-hosts style

       other-files
	      for the names of any non-directory files.	 This is used  instead
	      of all-files when	the list-dirs-first style is in	effect.

       packages
	      for packages (e.g. rpm or	installed Debian packages)

       parameters
	      for names	of parameters

       path-directories
	      for  names  of  directories  found by searching the cdpath array
	      when completing arguments	of cd  and  related  builtin  commands
	      (compare local-directories)

       paths  used  to	look  up  the values of	the expand, ambiguous and spe-
	      cial-dirs	styles

       pods   for perl pods (documentation files)

       ports  for communication	ports

       prefixes
	      for prefixes (like those of a URL)

       printers
	      for print	queue names

       processes
	      for process identifiers

       processes-names
	      used to look up the command style	when generating	the  names  of
	      processes	for killall

       sequences
	      for sequences (e.g. mh sequences)

       sessions
	      for sessions in the zftp function	suite

       signals
	      for signal names

       strings
	      for  strings  (e.g.  the	replacement strings for	the cd builtin
	      command)

       styles for styles used by the zstyle builtin command

       suffixes
	      for filename extensions

       tags   for tags (e.g. rpm tags)

       targets
	      for makefile targets

       time-zones
	      for time zones (e.g. when	setting	the TZ parameter)

       types  for types	of whatever (e.g. address types	for the	xhost command)

       urls   used to look up the urls and local styles	when completing	URLs

       users  for usernames

       values for one of a set of values in certain lists

       variant
	      used by _pick_variant to look up the command to run when	deter-
	      mining what program is installed for a particular	command	name.

       visuals
	      for X visuals

       warnings
	      used to look up the format style for warnings

       widgets
	      for zsh widget names

       windows
	      for IDs of X windows

       zsh-options
	      for shell	options

   Standard Styles
       Note  that the values of	several	of these styles	represent boolean val-
       ues.  Any of the	strings	`true',	`on', `yes', and `1' can be  used  for
       the  value  `true' and any of the strings `false', `off', `no', and `0'
       for the value `false'.  The behavior for	any other value	 is  undefined
       except  where  explicitly  mentioned.   The default value may be	either
       `true' or `false' if the	style is not set.

       Some of these styles are	tested first for  every	 possible  tag	corre-
       sponding	to a type of match, and	if no style was	found, for the default
       tag.  The most notable styles of	this type are  menu,  list-colors  and
       styles	controlling   completion   listing  such  as  list-packed  and
       last-prompt.  When tested for the default tag, only the function	 field
       of  the	context	will be	set so that a style using the default tag will
       normally	be defined along the lines of:

	      zstyle ':completion:*:default' menu ...

       accept-exact
	      This is tested for the default tag in addition to	the tags valid
	      for  the current context.	 If it is set to `true'	and any	of the
	      trial matches is the same	as the string  on  the	command	 line,
	      this match will immediately be accepted (even if it would	other-
	      wise be considered ambiguous).

	      When completing pathnames	(where the tag used is	`paths')  this
	      style accepts any	number of patterns as the value	in addition to
	      the boolean values.  Pathnames matching one  of  these  patterns
	      will  be	accepted immediately even if the command line contains
	      some more	partially typed	pathname components and	these match no
	      file under the directory accepted.

	      This  style  is  also used by the	_expand	completer to decide if
	      words beginning with a tilde or parameter	 expansion  should  be
	      expanded.	  For example, if there	are parameters foo and foobar,
	      the string `$foo'	will only be expanded if accept-exact  is  set
	      to  `true';  otherwise  the completion system will be allowed to
	      complete $foo to $foobar.	If the style  is  set  to  `continue',
	      _expand  will  add  the  expansion as a match and	the completion
	      system will also be allowed to continue.

       accept-exact-dirs
	      This is used by filename completion.  Unlike accept-exact	it  is
	      a	 boolean.  By default, filename	completion examines all	compo-
	      nents of a path to see if	there are completions of  that	compo-
	      nent,  even if the component matches an existing directory.  For
	      example, when completion after /usr/bin/,	the function  examines
	      possible completions to /usr.

	      When  this style is `true', any prefix of	a path that matches an
	      existing directory is accepted without any attempt  to  complete
	      it  further.  Hence, in the given	example, the path /usr/bin/ is
	      accepted immediately and completion tried	in that	directory.

	      This style is also useful	when completing	after directories that
	      magically	 appear	 when referenced, such as ZFS .zfs directories
	      or NetApp	.snapshot directories.	When  the  style  is  set  the
	      shell  does  not check for the existence of the directory	within
	      the parent directory.

	      If  you  wish  to	 inhibit  this	behaviour  entirely,  set  the
	      path-completion style (see below)	to `false'.

       add-space
	      This  style  is  used by the _expand completer.  If it is	`true'
	      (the default), a space will be inserted after all	words  result-
	      ing  from	 the  expansion,  or  a	slash in the case of directory
	      names.  If the value is `file', the completer will  only	add  a
	      space  to	 names	of existing files.  Either a boolean `true' or
	      the value	`file' may be combined with `subst', in	which case the
	      completer	 will  not add a space to words	generated from the ex-
	      pansion of a substitution	of the form `$(...)' or	`${...}'.

	      The _prefix completer uses this style as a simple	boolean	 value
	      to decide	if a space should be inserted before the suffix.

       ambiguous
	      This  applies  when  completing non-final	components of filename
	      paths, in	other words those with a trailing  slash.   If	it  is
	      set,  the	 cursor	 is  left after	the first ambiguous component,
	      even if menu completion is in use.  The style is	always	tested
	      with the paths tag.

       assign-list
	      When completing after an equals sign that	is being treated as an
	      assignment, the completion system	normally  completes  only  one
	      filename.	  In  some cases the value  may	be a list of filenames
	      separated	by colons, as with PATH	and similar parameters.	  This
	      style  can  be  set  to a	list of	patterns matching the names of
	      such parameters.

	      The default is to	complete lists when the	word on	the  line  al-
	      ready contains a colon.

       auto-description
	      If  set,	this style's value will	be used	as the description for
	      options that are not described by	the completion functions,  but
	      that  have exactly one argument.	The sequence `%d' in the value
	      will be replaced by the description for this argument.   Depend-
	      ing  on personal preferences, it may be useful to	set this style
	      to something like	`specify: %d'.	Note that this	may  not  work
	      for some commands.

       avoid-completer
	      This  is	used  by  the  _all_matches completer to decide	if the
	      string consisting	of all matches should be  added	 to  the  list
	      currently	being generated.  Its value is a list of names of com-
	      pleters.	If any of these	is the name of the completer that gen-
	      erated  the  matches  in this completion,	the string will	not be
	      added.

	      The default value	for this style is `_expand _old_list  _correct
	      _approximate',  i.e.  it	contains  the  completers  for which a
	      string with all matches will almost never	be wanted.

       cache-path
	      This style defines the path where	 any  cache  files  containing
	      dumped  completion  data	are  stored.   It  defaults to `$ZDOT-
	      DIR/.zcompcache',	or `$HOME/.zcompcache' if $ZDOTDIR is not  de-
	      fined.   The  completion	cache  will  not  be  used  unless the
	      use-cache	style is set.

       cache-policy
	      This style defines the function that will	be used	 to  determine
	      whether  a  cache	 needs	rebuilding.   See  the	section	on the
	      _cache_invalid function below.

       call-command
	      This style is used in the	function for commands such as make and
	      ant  where calling the command directly to generate matches suf-
	      fers problems such as being slow or, as in the case of make  can
	      potentially  cause actions in the	makefile to be executed. If it
	      is set to	`true' the command is called to	generate matches.  The
	      default value of this style is `false'.

       command
	      In  many places, completion functions need to call external com-
	      mands to generate	the list of completions.  This	style  can  be
	      used  to override	the command that is called in some such	cases.
	      The elements of the value	are joined with	spaces to form a  com-
	      mand  line  to execute.  The value can also start	with a hyphen,
	      in which case the	usual command will be added to the  end;  this
	      is  most	useful	for putting `builtin' or `command' in front to
	      make sure	the appropriate	version	of a command  is  called,  for
	      example  to avoid	calling	a shell	function with the same name as
	      an external command.

	      As an example, the completion function for process IDs uses this
	      style with the processes tag to generate the IDs to complete and
	      the list of processes  to	 display  (if  the  verbose  style  is
	      `true').	 The list produced by the command should look like the
	      output of	the ps command.	 The first line	is not displayed,  but
	      is searched for the string `PID' (or `pid') to find the position
	      of the process IDs in the	following lines.  If the line does not
	      contain  `PID', the first	numbers	in each	of the other lines are
	      taken as the process IDs to complete.

	      Note that	the completion function	 generally  has	 to  call  the
	      specified	 command  for  each attempt to generate	the completion
	      list.  Hence care	should be taken	to specify only	commands  that
	      take  a  short  time to run, and in particular to	avoid any that
	      may never	terminate.

       command-path
	      This is a	list of	directories to search  for  commands  to  com-
	      plete.   The  default for	this style is the value	of the special
	      parameter	path.

       commands
	      This is used by the function  completing	sub-commands  for  the
	      system  initialisation scripts (residing in /etc/init.d or some-
	      where not	too far	away from that).  Its values give the  default
	      commands to complete for those commands for which	the completion
	      function isn't able to find them out automatically.  The default
	      for this style are the two strings `start' and `stop'.

       complete
	      This  is	used  by  the _expand_alias function when invoked as a
	      bindable command.	 If set	to `true' and the word on the  command
	      line  is	not the	name of	an alias, matching alias names will be
	      completed.

       complete-options
	      This is used by the completer for	 cd,  chdir  and  pushd.   For
	      these  commands a	- is used to introduce a directory stack entry
	      and completion of	these is far more common than  completing  op-
	      tions.   Hence  unless the value of this style is	`true' options
	      will not be completed, even  after  an  initial  -.   If	it  is
	      `true',  options	will  be  completed  after an initial -	unless
	      there is a preceding -- on the command line.

       completer
	      The strings given	as the value of	this style provide  the	 names
	      of the completer functions to use. The available completer func-
	      tions are	described in the section `Control Functions' below.

	      Each string may be either	the name of a completer	function or  a
	      string  of the form `function:name'.  In the first case the com-
	      pleter field of the context will contain the name	 of  the  com-
	      pleter  without the leading underscore and with all other	under-
	      scores replaced by hyphens.  In the second case the function  is
	      the  name	of the completer to call, but the context will contain
	      the user-defined name in the completer field of the context.  If
	      the  name	 starts	with a hyphen, the string for the context will
	      be build from the	name of	the completer function as in the first
	      case with	the name appended to it.  For example:

		     zstyle ':completion:*' completer _complete	_complete:-foo

	      Here,  completion	 will call the _complete completer twice, once
	      using `complete' and once	using `complete-foo' in	the  completer
	      field  of	 the context.  Normally, using the same	completer more
	      than once	only makes sense when used with	 the  `functions:name'
	      form, because otherwise the context name will be the same	in all
	      calls to the completer; possible exceptions to this rule are the
	      _ignored and _prefix completers.

	      The  default  value for this style is `_complete _ignored': only
	      completion will be done, first using the ignored-patterns	 style
	      and the $fignore array and then without ignoring matches.

       condition
	      This  style is used by the _list completer function to decide if
	      insertion	of matches should be delayed unconditionally. The  de-
	      fault is `true'.

       delimiters
	      This  style is used when adding a	delimiter for use with history
	      modifiers	or glob	qualifiers that	have delimited arguments.   It
	      is an array of preferred delimiters to add.  Non-special charac-
	      ters are preferred as the	completion system may otherwise	become
	      confused.	  The  default list is :, +, /,	-, %.  The list	may be
	      empty to force a delimiter to be typed.

       disabled
	      If this is set to	`true',	the _expand_alias completer and	 bind-
	      able  command will try to	expand disabled	aliases, too.  The de-
	      fault is `false'.

       domains
	      A	list of	names of network domains for completion.  If  this  is
	      not  set,	 domain	 names	will  be  taken	from the file /etc/re-
	      solv.conf.

       environ
	      The environ style	is used	when completing	for `sudo'.  It	is set
	      to  an  array of `VAR=value' assignments to be exported into the
	      local environment	before the completion for the  target  command
	      is invoked.
	      zstyle ':completion:*:sudo::' environ \
		PATH="/sbin:/usr/sbin:$PATH" HOME="/root"

       expand This  style is used when completing strings consisting of	multi-
	      ple parts, such as path names.

	      If one of	its values is the string `prefix', the partially typed
	      word  from  the line will	be expanded as far as possible even if
	      trailing parts cannot be completed.

	      If one of	its values is the string `suffix', matching names  for
	      components  after	 the  first  ambiguous one will	also be	added.
	      This means that the resulting string is the longest  unambiguous
	      string  possible.	 However, menu completion can be used to cycle
	      through all matches.

       fake   This style may be	set for	any completion context.	 It  specifies
	      additional  strings  that	 will always be	completed in that con-
	      text.  The form of each string is	`value:description'; the colon
	      and  description may be omitted, but any literal colons in value
	      must be quoted with a backslash.	Any  description  provided  is
	      shown alongside the value	in completion listings.

	      It  is  important	to use a sufficiently restrictive context when
	      specifying fake strings.	Note that the  styles  fake-files  and
	      fake-parameters  provide	additional  features  when  completing
	      files or parameters.

       fake-always
	      This works identically to	the fake style	except	that  the  ig-
	      nored-patterns style is not applied to it.  This makes it	possi-
	      ble to override a	set of matches completely by setting  the  ig-
	      nored patterns to	`*'.

	      The  following  shows  a way of supplementing any	tag with arbi-
	      trary data, but having it	behave for  display  purposes  like  a
	      separate	tag.   In  this	 example  we  use  the features	of the
	      tag-order	style to divide	the  named-directories	tag  into  two
	      when  performing completion with the standard completer complete
	      for arguments of cd.  The	tag  named-directories-normal  behaves
	      as  normal,  but the tag named-directories-mine contains a fixed
	      set of directories.  This	has the	effect	of  adding  the	 match
	      group `extra directories'	with the given completions.

		     zstyle ':completion::complete:cd:*' tag-order \
		       'named-directories:-mine:extra\ directories
		       named-directories:-normal:named\	directories *'
		     zstyle ':completion::complete:cd:*:named-directories-mine'	\
		       fake-always mydir1 mydir2
		     zstyle ':completion::complete:cd:*:named-directories-mine'	\
		       ignored-patterns	'*'

       fake-files
	      This style is used when completing files and looked up without a
	      tag.  Its	values are of the form `dir:names...'.	This will  add
	      the names	(strings separated by spaces) as possible matches when
	      completing in the	directory dir, even if no  such	 files	really
	      exist.   The  dir	may be a pattern; pattern characters or	colons
	      in dir should be quoted with a backslash to  be  treated	liter-
	      ally.

	      This  can	be useful on systems that support special file systems
	      whose top-level pathnames	can not	be listed  or  generated  with
	      glob  patterns (but see accept-exact-dirs	for a more general way
	      of dealing with this problem).  It can also be used for directo-
	      ries for which one does not have read permission.

	      The  pattern  form can be	used to	add a certain `magic' entry to
	      all directories on a particular file system.

       fake-parameters
	      This is used by the completion  function	for  parameter	names.
	      Its values are names of parameters that might not	yet be set but
	      should be	completed nonetheless.	Each name may also be followed
	      by  a  colon  and	 a string specifying the type of the parameter
	      (like `scalar', `array' or `integer').  If the  type  is	given,
	      the  name	 will only be completed	if parameters of that type are
	      required in the particular context.  Names for which no type  is
	      specified	will always be completed.

       file-list
	      This  style  controls whether files completed using the standard
	      builtin mechanism	are to be listed with a	long list  similar  to
	      ls  -l.	Note  that this	feature	uses the shell module zsh/stat
	      for file information; this loads the builtin stat	which will re-
	      place any	external stat executable.  To avoid this the following
	      code can be included in an initialization	file:

		     zmodload -i zsh/stat
		     disable stat

	      The style	may either be set to a `true' value (or	`all'),	or one
	      of  the  values `insert' or `list', indicating that files	are to
	      be listed	in long	format in all circumstances, or	when  attempt-
	      ing  to  insert  a file name, or when listing file names without
	      attempting to insert one.

	      More generally, the value	may be an array	of any	of  the	 above
	      values, optionally followed by =num.  If num is present it gives
	      the maximum number of matches for	which long listing style  will
	      be used.	For example,

		     zstyle ':completion:*' file-list list=20 insert=10

	      specifies	 that  long  format will be used when listing up to 20
	      files or inserting a file	with up	 to  10	 matches  (assuming  a
	      listing  is to be	shown at all, for example on an	ambiguous com-
	      pletion),	else short format will be used.

		     zstyle -e ':completion:*' file-list \
			    '((	${+NUMERIC} )) && reply=(true)'

	      specifies	that long format will be used any time a numeric argu-
	      ment is supplied,	else short format.

       file-patterns
	      This  is used by the standard function for completing filenames,
	      _files.  If the style is unset up	to  three  tags	 are  offered,
	      `globbed-files',`directories'  and `all-files', depending	on the
	      types of files  expected by the caller of	_files.	 The first two
	      (`globbed-files'	and  `directories')  are  normally offered to-
	      gether to	make it	easier to complete files in sub-directories.

	      The file-patterns	style provides	alternatives  to  the  default
	      tags, which are not used.	 Its value consists of elements	of the
	      form `pattern:tag'; each string may contain any number  of  such
	      specifications separated by spaces.

	      The  pattern  is	a pattern that is to be	used to	generate file-
	      names.  Any occurrence of	the sequence `%p' is replaced  by  any
	      pattern(s) passed	by the function	calling	_files.	 Colons	in the
	      pattern must be preceded by a backslash  to  make	 them  distin-
	      guishable	 from the colon	before the tag.	 If more than one pat-
	      tern is needed, the patterns can be given	inside	braces,	 sepa-
	      rated by commas.

	      The  tags	 of all	strings	in the value will be offered by	_files
	      and used when looking up other styles.  Any  tags	 in  the  same
	      word  will  be  offered at the same time and before later	words.
	      If no `:tag' is given the	`files'	tag will be used.

	      The tag may also be followed by an optional second colon	and  a
	      description, which will be used for the `%d' in the value	of the
	      format style (if that is set) instead of the default description
	      supplied	by  the	completion function.  If the description given
	      here contains itself a `%d', that	is replaced with the  descrip-
	      tion supplied by the completion function.

	      For example, to make the rm command first	complete only names of
	      object files and then the	names of all  files  if	 there	is  no
	      matching object file:

		     zstyle ':completion:*:*:rm:*:*' file-patterns \
			 '*.o:object-files' '%p:all-files'

	      To alter the default behaviour of	file completion	-- offer files
	      matching a pattern and directories on the	 first	attempt,  then
	      all  files -- to offer only matching files on the	first attempt,
	      then directories,	and finally all	files:

		     zstyle ':completion:*' file-patterns \
			 '%p:globbed-files' '*(-/):directories'	'*:all-files'

	      This works even  where  there  is	 no  special  pattern:	_files
	      matches  all  files  using the pattern `*' at the	first step and
	      stops when it sees this pattern.	Note also it will never	try  a
	      pattern more than	once for a single completion attempt.

	      During  the execution of completion functions, the EXTENDED_GLOB
	      option is	in effect, so the characters `#',  `~'	and  `^'  have
	      special meanings in the patterns.

       file-sort
	      The  standard filename completion	function uses this style with-
	      out a tag	to determine  in  which	 order	the  names  should  be
	      listed;  menu completion will cycle through them in the same or-
	      der.  The	possible values	are: `size' to sort by the size	of the
	      file; `links' to sort by the number of links to the file;	`modi-
	      fication'	(or `time' or `date') to sort by the last modification
	      time;  `access' to sort by the last access time; and `inode' (or
	      `change')	to sort	by the last inode change time.	If  the	 style
	      is set to	any other value, or is unset, files will be sorted al-
	      phabetically by name.  If	the value  contains  the  string  `re-
	      verse',  sorting	is  done  in the opposite order.  If the value
	      contains the string `follow', timestamps are associated with the
	      targets  of symbolic links; the default is to use	the timestamps
	      of the links themselves.

       file-split-chars
	      A	set of characters that will cause all file completions for the
	      given  context to	be split at the	point where any	of the charac-
	      ters occurs.  A typical use is to	set the	style to :;  then  ev-
	      erything	up to and including the	last : in the string so	far is
	      ignored when completing files.  As this is  quite	 heavy-handed,
	      it is usually preferable to update completion functions for con-
	      texts where this behaviour is useful.

       filter The ldap plugin of  email	 address  completion  (see  _email_ad-
	      dresses)	uses  this  style  to  specify the attributes to match
	      against when filtering entries.  So for example, if the style is
	      set  to  `sn', matching is done against surnames.	 Standard LDAP
	      filtering	is used	so normal completion matching is bypassed.  If
	      this style is not	set, the LDAP plugin is	skipped.  You may also
	      need to set the command style to specify how to connect to  your
	      LDAP server.

       force-list
	      This forces a list of completions	to be shown at any point where
	      listing is done, even in cases where the list would  usually  be
	      suppressed.   For	 example,  normally  the list is only shown if
	      there are	at least two different matches.	 By setting this style
	      to  `always',  the  list	will always be shown, even if there is
	      only a single match that	will  immediately  be  accepted.   The
	      style  may  also be set to a number.  In this case the list will
	      be shown if there	are at least that many matches,	even  if  they
	      would all	insert the same	string.

	      This style is tested for the default tag as well as for each tag
	      valid for	the current completion.	  Hence	 the  listing  can  be
	      forced only for certain types of match.

       format If  this is set for the descriptions tag,	its value is used as a
	      string to	display	above matches in completion  lists.   The  se-
	      quence  `%d'  in	this  string will be replaced with a short de-
	      scription	of what	these matches are.  This string	may also  con-
	      tain  the	 output	 attribute  sequences understood by compadd -X
	      (see zshcompwid(1)).

	      The style	is tested with each tag	valid for the current  comple-
	      tion  before  it is tested for the descriptions tag.  Hence dif-
	      ferent format strings can	be  defined  for  different  types  of
	      match.

	      Note  also  that	some  completer	 functions  define  additional
	      `%'-sequences.  These are	described for the completer  functions
	      that make	use of them.

	      Some  completion	functions  display  messages  that may be cus-
	      tomised by setting this style for	the messages tag.   Here,  the
	      `%d'  is	replaced  with a message given by the completion func-
	      tion.

	      Finally, the format string is looked up with the	warnings  tag,
	      for use when no matches could be generated at all.  In this case
	      the `%d' is replaced with	the descriptions for the matches  that
	      were  expected  separated	 by  spaces.  The sequence `%D'	is re-
	      placed with the same descriptions	separated by newlines.

	      It is possible to	use printf-style field width  specifiers  with
	      `%d' and similar escape sequences.  This is handled by the zfor-
	      mat builtin command  from	 the  zsh/zutil	 module,  see  zshmod-
	      ules(1).

       glob   This  is	used by	the _expand completer.	If it is set to	`true'
	      (the default), globbing will be attempted	on the words resulting
	      from  a previous substitution (see the substitute	style) or else
	      the original string from the line.

       global If this is set to	`true' (the default), the  _expand_alias  com-
	      pleter and bindable command will try to expand global aliases.

       group-name
	      The  completion  system  can  group  different types of matches,
	      which appear in separate lists.  This style can be used to  give
	      the  names  of groups for	particular tags.  For example, in com-
	      mand position the	completion system generates names  of  builtin
	      and external commands, names of aliases, shell functions and pa-
	      rameters and reserved words as possible  completions.   To  have
	      the external commands and	shell functions	listed separately:

		     zstyle ':completion:*:*:-command-:*:commands' \
			    group-name commands
		     zstyle ':completion:*:*:-command-:*:functions' \
			    group-name functions

	      As  a consequence, any match with	the same tag will be displayed
	      in the same group.

	      If the name given	is the empty string the	name of	 the  tag  for
	      the  matches will	be used	as the name of the group.  So, to have
	      all different types of matches  displayed	 separately,  one  can
	      just set:

		     zstyle ':completion:*' group-name ''

	      All  matches for which no	group name is defined will be put in a
	      group named -default-.

       group-order
	      This style is additional to the group-name style to specify  the
	      order  for  display of the groups	defined	by that	style (compare
	      tag-order, which determines which	completions  appear  at	 all).
	      The  groups named	are shown in the given order; any other	groups
	      are shown	in the order defined by	the completion function.

	      For example, to have names of builtin commands, shell  functions
	      and  external  commands  appear in that order when completing in
	      command position:

		     zstyle ':completion:*:*:-command-:*:*' group-order	\
			    builtins functions commands

       groups A	list of	names of UNIX groups.  If this is not set, group names
	      are taken	from the YP database or	the file `/etc/group'.

       hidden If this is set to	`true',	matches	for the	given context will not
	      be listed, although any description for the matches set with the
	      format style will	be shown.  If it is set	to `all', not even the
	      description will be displayed.

	      Note that	the matches will still be completed; they are just not
	      shown in the list.  To avoid having matches considered as	possi-
	      ble completions at all, the tag-order style can be  modified  as
	      described	below.

       hosts  A	 list  of names	of hosts that should be	completed.  If this is
	      not set, hostnames are taken from	the file `/etc/hosts'.

       hosts-ports
	      This style is used by commands that need or accept hostnames and
	      network  ports.	The strings in the value should	be of the form
	      `host:port'.  Valid ports	are  determined	 by  the  presence  of
	      hostnames; multiple ports	for the	same host may appear.

       ignore-line
	      This  is	tested	for each tag valid for the current completion.
	      If it is set to `true', none of the words	that  are  already  on
	      the  line	 will be considered as possible	completions.  If it is
	      set to `current',	the word the cursor is on will not be  consid-
	      ered  as	a  possible  completion.  The value `current-shown' is
	      similar but only applies if the list of completions is currently
	      shown  on	 the screen.  Finally, if the style is set to `other',
	      all words	on the line except for the current  one	 will  be  ex-
	      cluded from the possible completions.

	      The  values `current' and	`current-shown'	are a bit like the op-
	      posite of	the accept-exact style:	  only	strings	 with  missing
	      characters will be completed.

	      Note  that you almost certainly don't want to set	this to	`true'
	      or `other' for a general context such as `:completion:*'.	  This
	      is because it would disallow completion of, for example, options
	      multiple times even if the command in question accepts  the  op-
	      tion more	than once.

       ignore-parents
	      The  style  is  tested  without a	tag by the function completing
	      pathnames	in order to determine whether to ignore	the  names  of
	      directories  already  mentioned in the current word, or the name
	      of the current working directory.	 The value must	include	one or
	      both of the following strings:

	      parent The name of any directory whose path is already contained
		     in	the word on the	line is	ignored.   For	example,  when
		     completing	 after	foo/../, the directory foo will	not be
		     considered	a valid	completion.

	      pwd    The name of the current working  directory	 will  not  be
		     completed;	 hence,	for example, completion	after ../ will
		     not use the name of the current directory.

	      In addition, the value may include one or	both of:

	      ..     Ignore the	specified directories only when	 the  word  on
		     the line contains the substring `../'.

	      directory
		     Ignore  the  specified directories	only when names	of di-
		     rectories are completed, not  when	 completing  names  of
		     files.

	      Excluded	values	act  in	a similar fashion to values of the ig-
	      nored-patterns style, so they can	be restored  to	 consideration
	      by the _ignored completer.

       extra-verbose
	      If  set, the completion listing is more verbose at the cost of a
	      probable decrease	in completion speed.   Completion  performance
	      will suffer if this style	is set to `true'.

       ignored-patterns
	      A	 list  of  patterns;  any trial	completion matching one	of the
	      patterns will be excluded	from consideration.  The _ignored com-
	      pleter  can  appear in the list of completers to restore the ig-
	      nored matches.  This is a	more configurable version of the shell
	      parameter	$fignore.

	      Note  that  the EXTENDED_GLOB option is set during the execution
	      of completion functions, so the characters `#', `~' and `^' have
	      special meanings in the patterns.

       insert This  style  is  used  by	 the  _all_matches completer to	decide
	      whether to insert	the list of all	 matches  unconditionally  in-
	      stead of adding the list as another match.

       insert-ids
	      When  completing	process	 IDs,  for example as arguments	to the
	      kill and wait builtins the name of a command may be converted to
	      the  appropriate	process	ID.  A problem arises when the process
	      name typed is not	unique.	 By default (or	if this	style  is  set
	      explicitly  to `menu') the name will be converted	immediately to
	      a	set of possible	IDs, and menu completion will  be  started  to
	      cycle through them.

	      If the value of the style	is `single', the shell will wait until
	      the user has typed enough	to make	the command unique before con-
	      verting the name to an ID; attempts at completion	will be	unsuc-
	      cessful until that point.	 If the	value  is  any	other  string,
	      menu  completion	will  be  started when the string typed	by the
	      user is longer than the common prefix to the corresponding IDs.

       insert-tab
	      If this is set to	`true',	the completion system  will  insert  a
	      TAB  character  (assuming	that was used to start completion) in-
	      stead of performing completion when there	is no non-blank	 char-
	      acter  to	the left of the	cursor.	 If it is set to `false', com-
	      pletion will be done even	there.

	      The value	may also contain the substrings	 `pending'  or	`pend-
	      ing=val'.	  In  this  case, the typed character will be inserted
	      instead of starting completion when there	is  unprocessed	 input
	      pending.	 If  a	val  is	 given,	completion will	not be done if
	      there are	at least that many characters  of  unprocessed	input.
	      This  is	often  useful when pasting characters into a terminal.
	      Note however, that it relies on the $PENDING  special  parameter
	      from  the	zsh/zle	module being set properly which	is not guaran-
	      teed on all platforms.

	      The default value	of this	style is `true'	except for  completion
	      within vared builtin command where it is `false'.

       insert-unambiguous
	      This  is	used by	the _match and _approximate completers.	 These
	      completers are often used	with menu completion  since  the  word
	      typed may	bear little resemblance	to the final completion.  How-
	      ever, if this style is `true', the  completer  will  start  menu
	      completion  only	if it could find no unambiguous	initial	string
	      at least as long as the original string typed by the user.

	      In the case of the _approximate completer, the  completer	 field
	      in  the context will already have	been set to one	of correct-num
	      or approximate-num, where	num is the number of errors that  were
	      accepted.

	      In  the  case of the _match completer, the style may also	be set
	      to the string `pattern'.	Then the pattern on the	line  is  left
	      unchanged	if it does not match unambiguously.

       gain-privileges
	      If set to	true, this style enables the use of commands like sudo
	      or doas to gain extra privileges when retrieving information for
	      completion.  This	 is  only done when a command such as sudo ap-
	      pears on the command-line. To force the use of, e.g. sudo	or  to
	      override	any prefix that	might be added due to gain-privileges,
	      the command style	can be used with a value that  begins  with  a
	      hyphen.

       keep-prefix
	      This  style  is used by the _expand completer.  If it is `true',
	      the completer will try to	keep a prefix containing  a  tilde  or
	      parameter	 expansion.   Hence,  for  example,  the string	`~/f*'
	      would be expanded	to `~/foo' instead  of	`/home/user/foo'.   If
	      the  style  is  set  to `changed'	(the default), the prefix will
	      only be left unchanged if	there were other changes  between  the
	      expanded words and the original word from	the command line.  Any
	      other value forces the prefix to be expanded unconditionally.

	      The behaviour of _expand when this style is `true' is  to	 cause
	      _expand  to  give	 up  when a single expansion with the restored
	      prefix is	the same as the	original;  hence  any  remaining  com-
	      pleters may be called.

       last-prompt
	      This  is	a more flexible	form of	the ALWAYS_LAST_PROMPT option.
	      If it is `true', the completion system will try  to  return  the
	      cursor  to  the previous command line after displaying a comple-
	      tion list.  It is	tested for all tags valid for the current com-
	      pletion, then the	default	tag.  The cursor will be moved back to
	      the previous line	if this	style  is  `true'  for	all  types  of
	      match.   Note  that unlike the ALWAYS_LAST_PROMPT	option this is
	      independent of the numeric argument.

       known-hosts-files
	      This style should	contain	a list of files	 to  search  for  host
	      names  and (if the use-ip	style is set) IP addresses in a	format
	      compatible with ssh known_hosts files.  If it is	not  set,  the
	      files /etc/ssh/ssh_known_hosts and ~/.ssh/known_hosts are	used.

       list   This  style  is used by the _history_complete_word bindable com-
	      mand.  If	it is set to `true' it has no effect.  If it is	set to
	      `false'  matches will not	be listed.  This overrides the setting
	      of the options  controlling  listing  behaviour,	in  particular
	      AUTO_LIST.   The	context	 always	 starts	with `:completion:his-
	      tory-words'.

       list-colors
	      If the zsh/complist module is loaded, this style can be used  to
	      set  color  specifications.   This mechanism replaces the	use of
	      the ZLS_COLORS and ZLS_COLOURS parameters	described in the  sec-
	      tion  `The zsh/complist Module' in zshmodules(1),	but the	syntax
	      is the same.

	      If this style is set for the default tag,	 the  strings  in  the
	      value  are  taken	 as  specifications that are to	be used	every-
	      where.  If it is set for other tags, the specifications are used
	      only  for	matches	of the type described by the tag.  For this to
	      work best, the group-name	style must be set to an	empty string.

	      In addition to setting styles for	specific tags, it is also pos-
	      sible  to	use group names	specified explicitly by	the group-name
	      tag together with	the `(group)' syntax allowed by	the ZLS_COLORS
	      and ZLS_COLOURS parameters and simply using the default tag.

	      It  is  possible	to use any color specifications	already	set up
	      for the GNU version of the ls command:

		     zstyle ':completion:*:default' list-colors	\
			    ${(s.:.)LS_COLORS}

	      The default colors are the same as for the GNU  ls  command  and
	      can  be  obtained	 by setting the	style to an empty string (i.e.
	      '').

       list-dirs-first
	      This is used by file completion.	If set,	directories to be com-
	      pleted  are  listed  separately  from  and before	completion for
	      other files, regardless of tag ordering.	In addition,  the  tag
	      other-files  is  used  in	 place	of all-files for the remaining
	      files, to	indicate that no directories are presented  with  that
	      tag.

       list-grouped
	      If  this	style  is  `true' (the default), the completion	system
	      will try to make certain completion  listings  more  compact  by
	      grouping	matches.   For example,	options	for commands that have
	      the same description (shown when the verbose  style  is  set  to
	      `true')  will appear as a	single entry.  However,	menu selection
	      can be used to cycle through all the matches.

       list-packed
	      This is tested for each tag valid	in the current context as well
	      as  the  default tag.  If	it is set to `true', the corresponding
	      matches appear in	listings as if	the  LIST_PACKED  option  were
	      set.  If it is set to `false', they are listed normally.

       list-prompt
	      If  this style is	set for	the default tag, completion lists that
	      don't fit	on the screen can be scrolled (see the description  of
	      the  zsh/complist	 module	 in zshmodules(1)).  The value,	if not
	      the empty	string,	will be	displayed after	 every	screenful  and
	      the  shell  will	prompt for a key press;	if the style is	set to
	      the empty	string,	a default prompt will be used.

	      The value	may contain the	escape sequences: `%l' or `%L',	 which
	      will  be	replaced  by the number	of the last line displayed and
	      the total	number of lines; `%m' or `%M', the number of the  last
	      match  shown and the total number	of matches; and	`%p' and `%P',
	      `Top' when at the	beginning of the list, `Bottom'	 when  at  the
	      end  and	the position shown as a	percentage of the total	length
	      otherwise.  In each case the form	with the uppercase letter will
	      be  replaced  by	a  string of fixed width, padded to the	 right
	      with spaces, while the lowercase form  will  be  replaced	 by  a
	      variable	width  string.	As in other prompt strings, the	escape
	      sequences	`%S', `%s', `%B', `%b',	`%U', `%u'  for	 entering  and
	      leaving  the  display  modes  standout,  bold and	underline, and
	      `%F', `%f', `%K',	`%k' for changing  the	foreground  background
	      colour, are also available, as is	the form `%{...%}' for enclos-
	      ing escape sequences which display with zero (or,	with a numeric
	      argument,	some other) width.

	      After deleting this prompt the variable LISTPROMPT should	be un-
	      set for the removal to take effect.

       list-rows-first
	      This style is tested in the same way as  the  list-packed	 style
	      and  determines whether matches are to be	listed in a rows-first
	      fashion as if the	LIST_ROWS_FIRST	option were set.

       list-suffixes
	      This style is used by the	function that completes	filenames.  If
	      it is `true', and	completion is attempted	on a string containing
	      multiple partially typed pathname	components, all	ambiguous com-
	      ponents will be shown.  Otherwise, completion stops at the first
	      ambiguous	component.

       list-separator
	      The value	of this	style is used in completion listing  to	 sepa-
	      rate  the	 string	 to  complete from a description when possible
	      (e.g. when completing options).  It defaults to  `--'  (two  hy-
	      phens).

       local  This  is for use with functions that complete URLs for which the
	      corresponding files are available	directly from the file system.
	      Its  value should	consist	of three strings: a hostname, the path
	      to the default web pages for the server, and the directory  name
	      used by a	user placing web pages within their home area.

	      For example:

		     zstyle ':completion:*' local toast	\
			 /var/http/public/toast	public_html

	      Completion  after	 `http://toast/stuff/'	will look for files in
	      the directory  /var/http/public/toast/stuff,   while  completion
	      after  `http://toast/~yousir/' will look for files in the	direc-
	      tory ~yousir/public_html.

       mail-directory
	      If set, zsh will assume that mailbox files can be	found  in  the
	      directory	specified.  It defaults	to `~/Mail'.

       match-original
	      This  is	used  by  the _match completer.	 If it is set to only,
	      _match will try to generate matches without inserting a  `*'  at
	      the  cursor  position.   If set to any other non-empty value, it
	      will first try to	generate matches without inserting the `*' and
	      if  that	yields	no matches, it will try	again with the `*' in-
	      serted.  If it is	unset or set to	 the  empty  string,  matching
	      will only	be performed with the `*' inserted.

       matcher
	      This  style  is tested separately	for each tag valid in the cur-
	      rent context.  Its value is placed before	any  match  specifica-
	      tions  given  by the matcher-list	style so can override them via
	      the use of an x: specification.  The value should	be in the form
	      described	 in  the section `Completion Matching Control' in zsh-
	      compwid(1).  For examples	of this, see the  description  of  the
	      tag-order	style.

	      For  notes comparing the use of this and the matcher-list	style,
	      see under	the description	of the tag-order style.

       matcher-list
	      This style can be	set to a list of match specifications that are
	      to  be applied everywhere. Match specifications are described in
	      the section `Completion Matching Control'	in zshcompwid(1).  The
	      completion  system will try them one after another for each com-
	      pleter selected.	For example, to	try  first  simple  completion
	      and, if that generates no	matches, case-insensitive completion:

		     zstyle ':completion:*' matcher-list '' 'm:{a-zA-Z}={A-Za-z}'

	      By  default  each	 specification replaces	the previous one; how-
	      ever, if a specification is prefixed with	+, it is added to  the
	      existing list.  Hence it is possible to create increasingly gen-
	      eral specifications without repetition:

		     zstyle ':completion:*' matcher-list \
			    '' '+m:{a-z}={A-Z}'	'+m:{A-Z}={a-z}'

	      It is possible to	create match specifications valid for particu-
	      lar  completers  by  using the third field of the	context.  This
	      applies  only   to   completers	that   override	  the	global
	      matcher-list, which as of	this writing includes only _prefix and
	      _ignored.	 For example, to  use  the  completers	_complete  and
	      _prefix  but  allow  case-insensitive completion only with _com-
	      plete:

		     zstyle ':completion:*' completer _complete	_prefix
		     zstyle ':completion:*:complete:*:*:*' matcher-list	\
			    '' 'm:{a-zA-Z}={A-Za-z}'

	      User-defined names, as explained for the	completer  style,  are
	      available.   This	 makes	it  possible to	try the	same completer
	      more than	once with different match  specifications  each	 time.
	      For example, to try normal completion without a match specifica-
	      tion, then normal	 completion  with  case-insensitive  matching,
	      then correction, and finally partial-word	completion:

		     zstyle ':completion:*' completer \
			 _complete _correct _complete:foo
		     zstyle ':completion:*:complete:*:*:*' matcher-list	\
			 '' 'm:{a-zA-Z}={A-Za-z}'
		     zstyle ':completion:*:foo:*:*:*' matcher-list \
			 'm:{a-zA-Z}={A-Za-z} r:|[-_./]=* r:|=*'

	      If  the  style is	unset in any context no	match specification is
	      applied.	Note also that some completers such  as	 _correct  and
	      _approximate  do not use the match specifications	at all,	though
	      these completers will only ever  be  called  once	 even  if  the
	      matcher-list contains more than one element.

	      Where  multiple  specifications are useful, note that the	entire
	      completion is done for each element of matcher-list,  which  can
	      quickly  reduce  the  shell's  performance.   As a rough rule of
	      thumb, one to three strings will	give  acceptable  performance.
	      On  the other hand, putting multiple space-separated values into
	      the same string does not have an appreciable impact  on  perfor-
	      mance.

	      If  there	 is  no	current	matcher	or it is empty,	and the	option
	      NO_CASE_GLOB is in effect, the matching for files	 is  performed
	      case-insensitively  in  any case.	 However, any matcher must ex-
	      plicitly specify case-insensitive	matching if that is required.

	      For notes	comparing the use of this and the matcher  style,  see
	      under the	description of the tag-order style.

       max-errors
	      This  is	used  by the _approximate and _correct completer func-
	      tions to determine the maximum number of errors to  allow.   The
	      completer	will try to generate completions by first allowing one
	      error, then two errors, and so  on,  until  either  a  match  or
	      matches were found or the	maximum	number of errors given by this
	      style has	been reached.

	      If the value for this style contains the string  `numeric',  the
	      completer	function will take any numeric argument	as the maximum
	      number of	errors allowed.	For example, with

		     zstyle ':completion:*:approximate:::' max-errors 2	numeric

	      two errors are allowed if	no numeric argument is given, but with
	      a	 numeric argument of six (as in	`ESC-6 TAB'), up to six	errors
	      are accepted.  Hence with	a value	of `0 numeric',	no  correcting
	      completion will be attempted unless a numeric argument is	given.

	      If  the  value  contains the string `not-numeric', the completer
	      will not try to generate corrected completions when given	a  nu-
	      meric  argument,	so  in	this  case  the	number given should be
	      greater than zero.  For example, `2 not-numeric' specifies  that
	      correcting completion with two errors will usually be performed,
	      but if a numeric argument	is given, correcting  completion  will
	      not be performed.

	      The default value	for this style is `2 numeric'.

       max-matches-width
	      This  style is used to determine the trade off between the width
	      of the display used for matches and the width used for their de-
	      scriptions when the verbose style	is in effect.  The value gives
	      the number of display columns to reserve for the	matches.   The
	      default is half the width	of the screen.

	      This  has	the most impact	when several matches have the same de-
	      scription	and so will be grouped together.  Increasing the style
	      will  allow  more	 matches to be grouped together; decreasing it
	      will allow more of the description to be visible.

       menu   If this is `true'	in the context of any of the tags defined  for
	      the  current completion menu completion will be used.  The value
	      for a specific tag will take precedence over that	for  the  `de-
	      fault' tag.

	      If  none	of the values found in this way	is `true' but at least
	      one is set to `auto', the	shell behaves as if the	AUTO_MENU  op-
	      tion is set.

	      If  one of the values is explicitly set to `false', menu comple-
	      tion will	be explicitly turned off, overriding the MENU_COMPLETE
	      option and other settings.

	      In the form `yes=num', where `yes' may be	any of the `true' val-
	      ues (`yes', `true', `on'	and  `1'),  menu  completion  will  be
	      turned  on  if  there  are  at  least  num matches.  In the form
	      `yes=long', menu completion will be turned on if the  list  does
	      not  fit	on the screen.	This does not activate menu completion
	      if the widget normally only lists	completions, but menu  comple-
	      tion   can   be	activated   in	 that	case  with  the	 value
	      `yes=long-list' (Typically,  the	value  `select=long-list'  de-
	      scribed  later  is  more	useful	as  it	provides  control over
	      scrolling.)

	      Similarly, with any of the `false' values	(as in `no=10'),  menu
	      completion will not be used if there are num or more matches.

	      The value	of this	widget also controls menu selection, as	imple-
	      mented by	the zsh/complist module.  The following	values may ap-
	      pear either alongside or instead of the values above.

	      If  the  value contains the string `select', menu	selection will
	      be started unconditionally.

	      In the form `select=num',	menu selection will only be started if
	      there are	at least num matches.  If the values for more than one
	      tag provide a number, the	smallest number	is taken.

	      Menu selection can be turned off explicitly by defining a	 value
	      containing the string`no-select'.

	      It  is also possible to start menu selection only	if the list of
	      matches does not fit on the  screen  by  using  the  value  `se-
	      lect=long'.   To start menu selection even if the	current	widget
	      only performs listing, use the value `select=long-list'.

	      To turn on menu completion or menu selection when	 there	are  a
	      certain number of	matches	or the list of matches does not	fit on
	      the screen, both of `yes=' and `select='	may  be	 given	twice,
	      once with	a number and once with `long' or `long-list'.

	      Finally,	it  is	possible to activate two special modes of menu
	      selection.  The word `interactive' in the	value causes  interac-
	      tive  mode  to  be  entered  immediately	when menu selection is
	      started; see the description of the zsh/complist module in  zsh-
	      modules(1) for a description of interactive mode.	 Including the
	      string `search' does the same for	incremental search  mode.   To
	      select   backward	  incremental	search,	  include  the	string
	      `search-backward'.

       muttrc If set, gives the	location of the	mutt configuration  file.   It
	      defaults to `~/.muttrc'.

       numbers
	      This is used with	the jobs tag.  If it is	`true',	the shell will
	      complete job numbers instead of the shortest unambiguous	prefix
	      of  the job command text.	 If the	value is a number, job numbers
	      will only	be used	if that	many words from	the  job  descriptions
	      are  required to resolve ambiguities.  For example, if the value
	      is `1', strings will only	be used	if  all	 jobs  differ  in  the
	      first word on their command lines.

       old-list
	      This  is	used  by the _oldlist completer.  If it	is set to `al-
	      ways', then standard widgets which perform listing  will	retain
	      the  current  list of matches, however they were generated; this
	      can be turned off	explicitly with	the value `never', giving  the
	      behaviour	 without  the _oldlist completer.  If the style	is un-
	      set, or any other	value, then the	existing list  of  completions
	      is  displayed if it is not already; otherwise, the standard com-
	      pletion list is generated; this  is  the	default	 behaviour  of
	      _oldlist.	  However, if there is an old list and this style con-
	      tains the	name of	the  completer	function  that	generated  the
	      list, then the old list will be used even	if it was generated by
	      a	widget which does not do listing.

	      For example, suppose you type ^Xc	to use the _correct_word  wid-
	      get,  which  generates  a	list of	corrections for	the word under
	      the cursor.  Usually, typing ^D would generate a	standard  list
	      of  completions for the word on the command line,	and show that.
	      With _oldlist, it	will instead show the list of corrections  al-
	      ready generated.

	      As  another  example consider the	_match completer: with the in-
	      sert-unambiguous style set to `true' it inserts  only  a	common
	      prefix  string, if there is any.	However, this may remove parts
	      of the original pattern, so that further completion  could  pro-
	      duce  more  matches  than	 on  the  first	attempt.  By using the
	      _oldlist completer and setting this style	to _match, the list of
	      matches generated	on the first attempt will be used again.

       old-matches
	      This  is	used by	the _all_matches completer to decide if	an old
	      list of matches should be	used if	one exists.  This is  selected
	      by  one  of  the	`true' values or by the	string `only'.	If the
	      value is `only', _all_matches will only  use  an	old  list  and
	      won't  have  any	effect	on the list of matches currently being
	      generated.

	      If this style  is	 set  it  is  generally	 unwise	 to  call  the
	      _all_matches completer unconditionally.  One possible use	is for
	      either this style	or the completer style to be defined with  the
	      -e option	to zstyle to make the style conditional.

       old-menu
	      This  is	used  by the _oldlist completer.  It controls how menu
	      completion behaves when a	completion has already	been  inserted
	      and  the	user types a standard completion key such as TAB.  The
	      default behaviour	of _oldlist is	that  menu  completion	always
	      continues	 with the existing list	of completions.	 If this style
	      is set to	`false', however, a new	completion is started  if  the
	      old  list	 was generated by a different completion command; this
	      is the behaviour without the _oldlist completer.

	      For example, suppose you type ^Xc	to generate a list of  correc-
	      tions,  and menu completion is started in	one of the usual ways.
	      Usually, or with this style set to `false', typing TAB  at  this
	      point would start	trying to complete the line as it now appears.
	      With _oldlist, it	instead	continues to cycle through the list of
	      corrections.

       original
	      This  is used by the _approximate	and _correct completers	to de-
	      cide if the original string should be added as a	possible  com-
	      pletion.	 Normally, this	is done	only if	there are at least two
	      possible corrections, but	if this	style is set to	`true',	it  is
	      always  added.   Note  that  the style will be examined with the
	      completer	field in the context name set to  correct-num  or  ap-
	      proximate-num,  where  num is the	number of errors that were ac-
	      cepted.

       packageset
	      This style is used  when	completing  arguments  of  the	Debian
	      `dpkg' program.  It contains an override for the default package
	      set for a	given context.	For example,

		     zstyle ':completion:*:complete:dpkg:option--status-1:*' \
				    packageset avail

	      causes available packages, rather	than only installed  packages,
	      to be completed for `dpkg	--status'.

       path   The function that	completes color	names uses this	style with the
	      colors tag.  The value should be the pathname of a file contain-
	      ing  color  names	 in the	format of an X11 rgb.txt file.	If the
	      style is not set but this	file is	found in one of	various	 stan-
	      dard locations it	will be	used as	the default.

       path-completion
	      This  is used by filename	completion.  By	default, filename com-
	      pletion examines all components of a path	to see	if  there  are
	      completions  of that component.  For example, /u/b/z can be com-
	      pleted  to  /usr/bin/zsh.	  Explicitly  setting  this  style  to
	      `false'  inhibits	this behaviour for path	components up to the /
	      before the cursor; this  overrides  the  setting	of  accept-ex-
	      act-dirs.

	      Even with	the style set to `false', it is	still possible to com-
	      plete multiple paths by setting the option COMPLETE_IN_WORD  and
	      moving  the cursor back to the first component in	the path to be
	      completed.  For example, /u/b/z can be completed to /usr/bin/zsh
	      if the cursor is after the /u.

       pine-directory
	      If  set,	specifies the directory	containing PINE	mailbox	files.
	      There is no default, since recursively searching this  directory
	      is inconvenient for anyone who doesn't use PINE.

       ports  A	 list  of  Internet service names (network ports) to complete.
	      If this is not set,  service  names  are	taken  from  the  file
	      `/etc/services'.

       prefix-hidden
	      This  is	used for certain completions which share a common pre-
	      fix, for example command options beginning with dashes.	If  it
	      is `true', the prefix will not be	shown in the list of matches.

	      The default value	for this style is `false'.

       prefix-needed
	      This  style  is  also relevant for matches with a	common prefix.
	      If it is set to `true' this common prefix	must be	typed  by  the
	      user to generate the matches.

	      The  style  is  applicable  to the options, signals, jobs, func-
	      tions, and parameters completion tags.

	      For command options, this	means that the initial	`-',  `+',  or
	      `--'  must  be typed explicitly before option names will be com-
	      pleted.

	      For signals, an initial `-' is required before signal names will
	      be completed.

	      For  jobs,  an  initial `%' is required before job names will be
	      completed.

	      For function and parameter names,	an initial `_' or `.'  is  re-
	      quired  before  function	or parameter names starting with those
	      characters will be completed.

	      The default value	for this style is `false' for function and pa-
	      rameter completions, and	`true' otherwise.

       preserve-prefix
	      This style is used when completing path names.  Its value	should
	      be a pattern matching an initial prefix of the word to  complete
	      that  should be left unchanged under all circumstances.  For ex-
	      ample, on	some Unices an initial `//' (double slash) has a  spe-
	      cial  meaning;  setting  this style to the string	`//' will pre-
	      serve it.	 As another example, setting this style	to `?:/' under
	      Cygwin would allow completion after `a:/...' and so on.

       range  This  is	used  by  the _history completer and the _history_com-
	      plete_word bindable command to decide which words	should be com-
	      pleted.

	      If it is a single	number,	only the last N	words from the history
	      will be completed.

	      If it is a range of the form `max:slice',	the last  slice	 words
	      will  be	completed;  then  if that yields no matches, the slice
	      words before those will be tried and so on.  This	process	 stops
	      either when at least one match has been found, or	max words have
	      been tried.

	      The default is to	complete all words from	the history at once.

       recursive-files
	      If this style is set, its	value is an array of  patterns	to  be
	      tested  against  `$PWD/':	 note the trailing slash, which	allows
	      directories in the pattern to be delimited unambiguously by  in-
	      cluding  slashes	on both	sides.	If an ordinary file completion
	      fails and	the word on the	command	line does not yet have	a  di-
	      rectory  part to its name, the style is retrieved	using the same
	      tag as for the completion	 just  attempted,  then	 the  elements
	      tested  against  $PWD/  in turn.	If one matches,	then the shell
	      reattempts completion by prepending the word on the command line
	      with  each directory in the expansion of **/*(/) in turn.	 Typi-
	      cally the	elements of the	style will be set to restrict the num-
	      ber  of directories beneath the current one to a manageable num-
	      ber, for example `*/.git/*'.

	      For example,

		     zstyle ':completion:*' recursive-files '*/zsh/*'

	      If the current directory is  /home/pws/zsh/Src,  then  zle_trTAB
	      can be completed to Zle/zle_tricky.c.

       regular
	      This  style  is used by the _expand_alias	completer and bindable
	      command.	If set to `true' (the default),	regular	 aliases  will
	      be  expanded  but	 only  in  command  position.  If it is	set to
	      `false', regular aliases will never be expanded.	 If it is  set
	      to  `always',  regular  aliases  will be expanded	even if	not in
	      command position.

       rehash If this is set when completing external commands,	 the  internal
	      list (hash) of commands will be updated for each search by issu-
	      ing the rehash command.  There is	a speed	penalty	for this which
	      is  only	likely	to  be noticeable when directories in the path
	      have slow	file access.

       remote-access
	      If set to	`false', certain commands will be prevented from  mak-
	      ing  Internet  connections to retrieve remote information.  This
	      includes the completion for the CVS command.

	      It is not	always possible	to know	if connections are in fact  to
	      a	remote site, so	some may be prevented unnecessarily.

       remove-all-dups
	      The  _history_complete_word  bindable  command  and the _history
	      completer	use this to decide if all duplicate matches should  be
	      removed, rather than just	consecutive duplicates.

       select-prompt
	      If  this is set for the default tag, its value will be displayed
	      during menu selection (see the menu style	above) when  the  com-
	      pletion  list  does  not fit on the screen as a whole.  The same
	      escapes as for the list-prompt style are understood, except that
	      the  numbers  refer  to the match	or line	the mark is on.	 A de-
	      fault prompt is used when	the value is the empty string.

       select-scroll
	      This style is tested for the default tag and  determines	how  a
	      completion  list	is  scrolled  during a menu selection (see the
	      menu style above)	when the completion list does not fit  on  the
	      screen  as  a  whole.   If  the value is `0' (zero), the list is
	      scrolled by half-screenfuls; if it is a  positive	 integer,  the
	      list  is scrolled	by the given number of lines; if it is a nega-
	      tive number, the list is scrolled	by a screenful minus the abso-
	      lute  value  of  the  given  number of lines.  The default is to
	      scroll by	single lines.

       separate-sections
	      This style is used with the manuals tag when completing names of
	      manual  pages.   If it is	`true',	entries	for different sections
	      are added	separately using tag names  of	the  form  `manual.X',
	      where  X	is  the	 section number.  When the group-name style is
	      also in effect, pages from different sections will appear	 sepa-
	      rately.	This style is also used	similarly with the words style
	      when completing words for	the dict command. It allows words from
	      different	 dictionary databases to be added separately.  The de-
	      fault for	this style is `false'.

       show-ambiguity
	      If the zsh/complist module is loaded, this style can be used  to
	      highlight	the first ambiguous character in completion lists. The
	      value is either a	color indication such as  those	 supported  by
	      the  list-colors	style or, with a value of `true', a default of
	      underlining is selected. The highlighting	is only	applied	if the
	      completion display strings correspond to the actual matches.

       show-completer
	      Tested  whenever a new completer is tried.  If it	is `true', the
	      completion system	outputs	a progress message in the listing area
	      showing  what  completer	is  being  tried.  The message will be
	      overwritten by any output	when completions are found and is  re-
	      moved after completion is	finished.

       single-ignored
	      This  is	used  by the _ignored completer	when there is only one
	      match.  If its value is `show', the single match	will  be  dis-
	      played  but not inserted.	 If the	value is `menu', then the sin-
	      gle match	and the	original string	are both added as matches  and
	      menu  completion	is started, making it easy to select either of
	      them.

       sort   This allows the standard ordering	of matches to be overridden.

	      If its value is `true' or	`false', sorting is  enabled  or  dis-
	      abled.   Additionally the	values associated with the `-o'	option
	      to compadd can also be listed: match, nosort, numeric,  reverse.
	      If  it is	not set	for the	context, the standard behaviour	of the
	      calling widget is	used.

	      The style	is tested first	against	the full context including the
	      tag,  and	 if  that fails	to produce a value against the context
	      without the tag.

	      In many cases where a calling widget explicitly selects  a  par-
	      ticular  ordering	 in  lieu of the default, a value of `true' is
	      not honoured.  An	example	of where this is not the case  is  for
	      command history where the	default	of sorting matches chronologi-
	      cally may	be overridden by setting the style to `true'.

	      In the _expand completer,	if it is set to	`true',	the expansions
	      generated	 will  always be sorted.  If it	is set to `menu', then
	      the expansions are only sorted when they are offered  as	single
	      strings  but  not	 in  the string	containing all possible	expan-
	      sions.

       special-dirs
	      Normally,	the completion code will  not  produce	the  directory
	      names  `.'  and  `..' as possible	completions.  If this style is
	      set to `true', it	will add both `.' and `..' as possible comple-
	      tions; if	it is set to `..', only	`..' will be added.

	      The following example sets special-dirs to `..' when the current
	      prefix is	empty, is a single `.',	or consists only of a path be-
	      ginning with `../'.  Otherwise the value is `false'.

		     zstyle -e ':completion:*' special-dirs \
			'[[ $PREFIX = (../)#(|.|..) ]] && reply=(..)'

       squeeze-slashes
	      If  set  to  `true', sequences of	slashes	in filename paths (for
	      example in `foo//bar') will be treated as	a single slash.	  This
	      is  the  usual behaviour of UNIX paths.  However,	by default the
	      file completion function behaves as if there were	a `*'  between
	      the slashes.

       stop   If  set  to  `true', the _history_complete_word bindable command
	      will stop	once when reaching the beginning or end	 of  the  his-
	      tory.   Invoking _history_complete_word will then	wrap around to
	      the opposite end of the  history.	  If  this  style  is  set  to
	      `false'  (the default), _history_complete_word will loop immedi-
	      ately as in a menu completion.

       strip-comments
	      If set to	`true',	this style causes non-essential	 comment  text
	      to  be  removed  from  completion	matches.  Currently it is only
	      used when	completing e-mail addresses where it removes any  dis-
	      play  name  from	the  addresses,	 cutting  them	down  to plain
	      user@host	form.

       subst-globs-only
	      This is used by the _expand completer.  If it is set to  `true',
	      the  expansion  will  only be used if it resulted	from globbing;
	      hence, if	expansions resulted from the  use  of  the  substitute
	      style  described	below,	but  these were	not further changed by
	      globbing,	the expansions will be rejected.

	      The default for this style is `false'.

       substitute
	      This boolean style controls whether the _expand  completer  will
	      first  try  to  expand  all substitutions	in the string (such as
	      `$(...)' and `${...}').

	      The default is `true'.

       suffix This is used by the _expand completer if the word	starts with  a
	      tilde  or	 contains  a  parameter	 expansion.   If  it is	set to
	      `true', the word will only be expanded if	it doesn't have	a suf-
	      fix,  i.e.  if it	is something like `~foo' or `$foo' rather than
	      `~foo/' or `$foo/bar', unless that suffix	itself contains	 char-
	      acters  eligible	for  expansion.	 The default for this style is
	      `true'.

       tag-order
	      This provides a mechanism	for sorting how	the tags available  in
	      a	particular context will	be used.

	      The  values  for	the style are sets of space-separated lists of
	      tags.  The tags in each value will be tried at the same time; if
	      no  match	 is found, the next value is used.  (See the file-pat-
	      terns style for an exception to this behavior.)

	      For example:

		     zstyle ':completion:*:complete:-command-:*:*' tag-order \
			 'commands functions'

	      specifies	that completion	in command position first  offers  ex-
	      ternal  commands	and  shell  functions.	Remaining tags will be
	      tried if no completions are found.

	      In addition to tag names,	each string in the value may take  one
	      of the following forms:

	      -	     If	 any  value  consists  of only a hyphen, then only the
		     tags specified in the other values	are  generated.	  Nor-
		     mally  all	tags not explicitly selected are tried last if
		     the specified tags	fail to	generate  any  matches.	  This
		     means that	a single value consisting only of a single hy-
		     phen turns	off completion.

	      !	tags...
		     A string starting	with  an  exclamation  mark  specifies
		     names of tags that	are not	to be used.  The effect	is the
		     same as if	all other possible tags	for  the  context  had
		     been listed.

	      tag:label	...
		     Here, tag is one of the standard tags and label is	an ar-
		     bitrary name.  Matches are	generated as  normal  but  the
		     name  label  is used in contexts instead of tag.  This is
		     not useful	in words starting with !.

		     If	the label starts with a	hyphen,	the tag	 is  prepended
		     to	 the label to form the name used for lookup.  This can
		     be	used to	make the completion system try a  certain  tag
		     more  than	 once,	supplying different style settings for
		     each attempt; see below for an example.

	      tag:label:description
		     As	before,	but description	will replace the `%d'  in  the
		     value of the format style instead of the default descrip-
		     tion supplied by the completion function.	Spaces in  the
		     description  must be quoted with a	backslash.  A `%d' ap-
		     pearing in	description is replaced	with  the  description
		     given by the completion function.

	      In  any  of  the forms above the tag may be a pattern or several
	      patterns in the form `{pat1,pat2...}'.  In this case all	match-
	      ing  tags	 will  be  used	except for any given explicitly	in the
	      same string.

	      One use of these features	is to try one tag more than once, set-
	      ting  other styles differently on	each attempt, but still	to use
	      all the other tags without having	to repeat them all.  For exam-
	      ple,  to	make  completion of function names in command position
	      ignore all the completion	functions starting with	an  underscore
	      the first	time completion	is tried:

		     zstyle ':completion:*:*:-command-:*:*' tag-order \
			 'functions:-non-comp *' functions
		     zstyle ':completion:*:functions-non-comp' \
			 ignored-patterns '_*'

	      On the first attempt, all	tags will be offered but the functions
	      tag will be replaced by  functions-non-comp.   The  ignored-pat-
	      terns  style  is	set for	this tag to exclude functions starting
	      with an underscore.  If there are	no matches, the	 second	 value
	      of  the  tag-order style is used which completes functions using
	      the default tag, this time  presumably  including	 all  function
	      names.

	      The matches for one tag can be split into	different groups.  For
	      example:

		     zstyle ':completion:*' tag-order \
			 'options:-long:long\ options
			  options:-short:short\	options
			  options:-single-letter:single\ letter\ options'
		     zstyle ':completion:*:options-long' \
			  ignored-patterns '[-+](|-|[^-]*)'
		     zstyle ':completion:*:options-short' \
			  ignored-patterns '--*' '[-+]?'
		     zstyle ':completion:*:options-single-letter' \
			  ignored-patterns '???*'

	      With the group-names style set, options beginning	with `--', op-
	      tions beginning with a single `-'	or `+' but containing multiple
	      characters, and single-letter options will be displayed in sepa-
	      rate groups with different descriptions.

	      Another  use of patterns is to try multiple match	specifications
	      one after	another.  The matcher-list style offers	something sim-
	      ilar,  but  it is	tested very early in the completion system and
	      hence can't be set for single commands  nor  for	more  specific
	      contexts.	  Here	is  how	 to  try normal	completion without any
	      match specification and, if that generates no matches, try again
	      with  case-insensitive matching, restricting the effect to argu-
	      ments of the command foo:

		     zstyle ':completion:*:*:foo:*:*' tag-order	'*' '*:-case'
		     zstyle ':completion:*-case' matcher 'm:{a-z}={A-Z}'

	      First, all the tags offered when completing after	foo are	 tried
	      using  the  normal  tag name.  If	that generates no matches, the
	      second value of tag-order	is used, which tries  all  tags	 again
	      except  that  this  time each has	-case appended to its name for
	      lookup of	styles.	 Hence this time the  value  for  the  matcher
	      style  from  the second call to zstyle in	the example is used to
	      make completion case-insensitive.

	      It is possible to	use the	-e option of the zstyle	 builtin  com-
	      mand  to specify conditions for the use of particular tags.  For
	      example:

		     zstyle -e '*:-command-:*' tag-order '
			 if [[ -n $PREFIX$SUFFIX ]]; then
			   reply=( )
			 else
			   reply=( - )
			 fi'

	      Completion in command position will be  attempted	 only  if  the
	      string typed so far is not empty.	 This is tested	using the PRE-
	      FIX special parameter; see zshcompwid for	a description  of  pa-
	      rameters	which  are special inside completion widgets.  Setting
	      reply to an empty	array provides the default behaviour of	trying
	      all  tags	 at once; setting it to	an array containing only a hy-
	      phen disables the	use of all tags	and hence of all completions.

	      If no tag-order style  has  been	defined	 for  a	 context,  the
	      strings  `(|*-)argument-*	 (|*-)option-*	values'	 and `options'
	      plus all tags offered by the completion function will be used to
	      provide  a  sensible  default  behavior  that  causes  arguments
	      (whether normal command arguments	or arguments of	options) to be
	      completed	before option names for	most commands.

       urls   This  is used together with the urls tag by functions completing
	      URLs.

	      If the value consists of more than one string, or	 if  the  only
	      string  does  not	name a file or directory, the strings are used
	      as the URLs to complete.

	      If the value contains only one string which is  the  name	 of  a
	      normal  file  the	 URLs are taken	from that file (where the URLs
	      may be separated by white	space or newlines).

	      Finally, if the only string in the value names a directory,  the
	      directory	 hierarchy  rooted at this directory gives the comple-
	      tions.  The top  level  directory	 should	 be  the  file	access
	      method,  such  as	 `http', `ftp',	`bookmark' and so on.  In many
	      cases the	next level of directories will be a filename.  The di-
	      rectory hierarchy	can descend as deep as necessary.

	      For example,

		     zstyle ':completion:*' urls ~/.urls
		     mkdir -p ~/.urls/ftp/ftp.zsh.org/pub

	      allows   completion   of	 all   the   components	  of  the  URL
	      ftp://ftp.zsh.org/pub after suitable commands such as `netscape'
	      or  `lynx'.   Note,  however,  that access methods and files are
	      completed	separately, so if the hosts style is set hosts can  be
	      completed	without	reference to the urls style.

	      See the description in the function _urls	itself for more	infor-
	      mation (e.g. `more $^fpath/_urls(N)').

       use-cache
	      If this is set, the completion caching layer  is	activated  for
	      any  completions	which  use  it	(via  the  _store_cache,  _re-
	      trieve_cache, and	_cache_invalid functions).  The	directory con-
	      taining  the  cache  files  can  be  changed with	the cache-path
	      style.

       use-compctl
	      If this style is set to a	string not equal to false, 0, no,  and
	      off, the completion system may use any completion	specifications
	      defined with the compctl builtin command.	 If the	style  is  un-
	      set, this	is done	only if	the zsh/compctl	module is loaded.  The
	      string may also contain the substring `first' to use completions
	      defined  with  `compctl  -T', and	the substring `default'	to use
	      the completion defined with `compctl -D'.

	      Note that	this is	only intended to smooth	 the  transition  from
	      compctl  to  the	new completion system and may disappear	in the
	      future.

	      Note also	that the definitions from compctl will only be used if
	      there  is	 no  specific  completion  function for	the command in
	      question.	 For example, if there is a function _foo to  complete
	      arguments	 to the	command	foo, compctl will never	be invoked for
	      foo.  However, the compctl version will be  tried	 if  foo  only
	      uses default completion.

       use-ip By default, the function _hosts that completes host names	strips
	      IP addresses from	entries	read from host databases such  as  NIS
	      and  ssh	files.	 If this style is `true', the corresponding IP
	      addresses	can be completed as well.  This	style is  not  use  in
	      any  context  where the hosts style is set; note also it must be
	      set before the cache of host names is generated  (typically  the
	      first completion attempt).

       users  This  may	 be set	to a list of usernames to be completed.	 If it
	      is not set all usernames will be completed.  Note	that if	it  is
	      set  only	 that list of users will be completed; this is because
	      on some systems querying all users can take a prohibitive	amount
	      of time.

       users-hosts
	      The  values  of  this style should be of the form	`user@host' or
	      `user:host'. It is used for commands that	need  pairs  of	 user-
	      and hostnames.  These commands will complete usernames from this
	      style (only), and	will restrict subsequent  hostname  completion
	      to  hosts	 paired	 with  that  user  in one of the values	of the
	      style.

	      It is possible to	group values for sets of commands which	 allow
	      a	remote login, such as rlogin and ssh, by using the my-accounts
	      tag.  Similarly, values for sets of commands which usually refer
	      to the accounts of other people, such as talk and	finger,	can be
	      grouped by using the other-accounts tag.	More  ambivalent  com-
	      mands may	use the	accounts tag.

       users-hosts-ports
	      Like  users-hosts	but used for commands like telnet and contain-
	      ing strings of the form `user@host:port'.

       verbose
	      If set, as it is by default, the completion listing is more ver-
	      bose.  In	particular many	commands show descriptions for options
	      if this style is `true'.

       word   This is used by the _list	completer, which prevents  the	inser-
	      tion  of	completions until a second completion attempt when the
	      line has not changed.  The normal	way of finding out if the line
	      has  changed  is	to compare its entire contents between the two
	      occasions.  If this style	is `true', the comparison  is  instead
	      performed	only on	the current word.  Hence if completion is per-
	      formed on	another	word with the same contents,  completion  will
	      not be delayed.

CONTROL	FUNCTIONS
       The initialization script compinit redefines all	the widgets which per-
       form completion to call the supplied  widget  function  _main_complete.
       This function acts as a wrapper calling the so-called `completer' func-
       tions that generate matches.  If	_main_complete is  called  with	 argu-
       ments, these are	taken as the names of completer	functions to be	called
       in the order given.  If no arguments are	given, the set of functions to
       try is taken from the completer style.  For example, to use normal com-
       pletion and correction if that doesn't generate any matches:

	      zstyle ':completion:*' completer _complete _correct

       after calling compinit. The default value for this style	is  `_complete
       _ignored',  i.e.	normally only ordinary completion is tried, first with
       the effect of the ignored-patterns style	 and  then  without  it.   The
       _main_complete  function	 uses the return status	of the completer func-
       tions to	decide if other	completers should be called.   If  the	return
       status  is  zero,  no other completers are tried	and the	_main_complete
       function	returns.

       If the first argument to	_main_complete is a single hyphen,  the	 argu-
       ments  will  not	 be taken as names of completers.  Instead, the	second
       argument	gives a	name to	use in the completer field of the context  and
       the other arguments give	a command name and arguments to	call to	gener-
       ate the matches.

       The following completer functions are contained	in  the	 distribution,
       although	 users may write their own.  Note that in contexts the leading
       underscore is stripped, for example basic completion  is	 performed  in
       the context `:completion::complete:...'.

       _all_matches
	      This  completer  can  be	used to	add a string consisting	of all
	      other matches.  As it influences later completers	it must	appear
	      as  the first completer in the list.  The	list of	all matches is
	      affected by the avoid-completer and old-matches styles described
	      above.

	      It may be	useful to use the _generic function described below to
	      bind _all_matches	to its own keystroke, for example:

		     zle -C all-matches	complete-word _generic
		     bindkey '^Xa' all-matches
		     zstyle ':completion:all-matches:*'	old-matches only
		     zstyle ':completion:all-matches::::' completer _all_matches

	      Note that	this does not generate completions by  itself:	 first
	      use  any	of  the	 standard ways of generating a list of comple-
	      tions, then use ^Xa to show all matches.	It is possible instead
	      to  add  a  standard  completer to the list and request that the
	      list of all matches should be directly inserted:

		     zstyle ':completion:all-matches::::' completer \
			    _all_matches _complete
		     zstyle ':completion:all-matches:*'	insert true

	      In this case the old-matches style should	not be set.

       _approximate
	      This is similar to the basic _complete completer but allows  the
	      completions  to  undergo corrections.  The maximum number	of er-
	      rors can be specified by the max-errors style; see the  descrip-
	      tion  of	approximate  matching in zshexpn(1) for	how errors are
	      counted.	Normally this completer	will only be tried  after  the
	      normal _complete completer:

		     zstyle ':completion:*' completer _complete	_approximate

	      This  will give correcting completion if and only	if normal com-
	      pletion yields no	possible completions.  When corrected  comple-
	      tions  are found,	the completer will normally start menu comple-
	      tion allowing you	to cycle through these strings.

	      This completer uses the tags corrections and original when  gen-
	      erating  the  possible corrections and the original string.  The
	      format style for the former may contain the additional sequences
	      `%e' and `%o' which will be replaced by the number of errors ac-
	      cepted to	generate the corrections and the original string,  re-
	      spectively.

	      The  completer  progressively increases the number of errors al-
	      lowed up to the limit by the max-errors style, hence if  a  com-
	      pletion  is found	with one error,	no completions with two	errors
	      will be shown, and so on.	 It modifies the completer name	in the
	      context  to  indicate  the  number of errors being tried:	on the
	      first try	the completer field contains `approximate-1',  on  the
	      second try `approximate-2', and so on.

	      When _approximate	is called from another function, the number of
	      errors to	accept may be passed with the -a option.  The argument
	      is  in  the  same	 format	 as  the  max-errors style, all	in one
	      string.

	      Note that	this completer (and the	_correct  completer  mentioned
	      below)  can  be quite expensive to call, especially when a large
	      number of	errors are allowed.  One way to	avoid this is  to  set
	      up  the  completer  style	 using the -e option to	zstyle so that
	      some completers are only used when  completion  is  attempted  a
	      second time on the same string, e.g.:

		     zstyle -e ':completion:*' completer '
		       if [[ $_last_try	!= "$HISTNO$BUFFER$CURSOR" ]]; then
			 _last_try="$HISTNO$BUFFER$CURSOR"
			 reply=(_complete _match _prefix)
		       else
			 reply=(_ignored _correct _approximate)
		       fi'

	      This uses	the HISTNO parameter and the BUFFER and	CURSOR special
	      parameters that are available inside zle and completion  widgets
	      to  find	out  if	the command line hasn't	changed	since the last
	      time completion was tried.  Only then are	the _ignored, _correct
	      and _approximate completers called.

       _canonical_paths	 [ -A var ] [ -N ] [ -MJV12nfX ] tag descr [ paths ...
       ]
	      This completion function completes all paths given  to  it,  and
	      also  tries to offer completions which point to the same file as
	      one of the paths given (relative path when an absolute  path  is
	      given,  and  vice	versa; when ..'s are present in	the word to be
	      completed; and some paths	got from symlinks).

	      -A, if specified,	takes the paths	from the array variable	speci-
	      fied.  Paths  can	also be	specified on the command line as shown
	      above.  -N, if  specified,  prevents  canonicalizing  the	 paths
	      given before using them for completion, in case they are already
	      so. The options -M, -J, -V, -1, -2, -n, -F,  -X  are  passed  to
	      compadd.

	      See _description for a description of tag	and descr.

       _cmdambivalent
	      Completes	the remaining positional arguments as an external com-
	      mand.  The external command and its arguments are	 completed  as
	      separate	arguments  (in	a  manner  appropriate	for completing
	      /usr/bin/env) if there are two or	more remaining positional  ar-
	      guments  on the command line, and	as a quoted command string (in
	      the manner of system(...)) otherwise.  See also  _cmdstring  and
	      _precommand.

	      This function takes no arguments.

       _cmdstring
	      Completes	 an external command as	a single argument, as for sys-
	      tem(...).

       _complete
	      This completer generates all  possible  completions  in  a  con-
	      text-sensitive  manner, i.e. using the settings defined with the
	      compdef function explained above and the current settings	of all
	      special parameters.  This	gives the normal completion behaviour.

	      To  complete  arguments  of commands, _complete uses the utility
	      function _normal,	which is in turn responsible for  finding  the
	      particular function; it is described below.  Various contexts of
	      the form -context- are handled specifically. These are all  men-
	      tioned above as possible arguments to the	#compdef tag.

	      Before  trying  to find a	function for a specific	context, _com-
	      plete checks if the  parameter  `compcontext'  is	 set.  Setting
	      `compcontext'  allows  the  usual	 completion  dispatching to be
	      overridden which is useful in places such	 as  a	function  that
	      uses vared for input. If it is set to an array, the elements are
	      taken to be the possible matches which will be  completed	 using
	      the tag `values' and the description `value'. If it is set to an
	      associative array, the keys are used as the possible completions
	      and  the	values (if non-empty) are used as descriptions for the
	      matches.	If `compcontext' is set	to a string containing colons,
	      it  should  be of	the form `tag:descr:action'.  In this case the
	      tag and descr give the tag and description to use	and the	action
	      indicates	 what should be	completed in one of the	forms accepted
	      by the _arguments	utility	function described below.

	      Finally, if `compcontext'	is set to a string without colons, the
	      value  is	 taken as the name of the context to use and the func-
	      tion defined for that context will be called.  For this purpose,
	      there  is	 a special context named -command-line-	that completes
	      whole command lines (commands and	their arguments).  This	is not
	      used  by the completion system itself but	is nonetheless handled
	      when explicitly called.

       _correct
	      Generate corrections, but	not completions, for the current word;
	      this is similar to _approximate but will not allow any number of
	      extra characters at the cursor as	that completer does.  The  ef-
	      fect is similar to spell-checking.  It is	based on _approximate,
	      but the completer	field in the context name is correct.

	      For example, with:

		     zstyle ':completion:::::' completer \
			    _complete _correct _approximate
		     zstyle ':completion:*:correct:::' max-errors 2 not-numeric
		     zstyle ':completion:*:approximate:::' max-errors 3	numeric

	      correction will accept up	to two errors.	If a numeric  argument
	      is  given, correction will not be	performed, but correcting com-
	      pletion will be, and will	accept as many errors as given by  the
	      numeric  argument.  Without a numeric argument, first correction
	      and then correcting completion will be tried, with the first one
	      accepting	two errors and the second one accepting	three errors.

	      When  _correct  is called	as a function, the number of errors to
	      accept may be given following the	-a option.  The	argument is in
	      the same form a values to	the accept style, all in one string.

	      This  completer function is intended to be used without the _ap-
	      proximate	completer or, as in the	example, just before it.   Us-
	      ing  it  after  the _approximate completer is useless since _ap-
	      proximate	will at	least generate the corrected strings generated
	      by the _correct completer	-- and probably	more.

       _expand
	      This  completer function does not	really perform completion, but
	      instead checks if	the word on the	command	line is	 eligible  for
	      expansion	 and,  if  it is, gives	detailed control over how this
	      expansion	is done.  For this to happen,  the  completion	system
	      needs  to	 be invoked with complete-word,	not expand-or-complete
	      (the default binding for TAB), as	otherwise the string  will  be
	      expanded by the shell's internal mechanism before	the completion
	      system is	started.  Note also this completer  should  be	called
	      before the _complete completer function.

	      The  tags	used when generating expansions	are all-expansions for
	      the string containing all	possible expansions,  expansions  when
	      adding  the  possible  expansions	as single matches and original
	      when adding the original string from the	line.	The  order  in
	      which  these strings are generated, if at	all, can be controlled
	      by the group-order and tag-order styles, as usual.

	      The format string	for all-expansions and for expansions may con-
	      tain  the	 sequence  `%o'	which will be replaced by the original
	      string from the line.

	      The kind of expansion to be tried	is controlled by  the  substi-
	      tute, glob and subst-globs-only styles.

	      It is also possible to call _expand as a function, in which case
	      the different modes may be selected with options:	-s for substi-
	      tute, -g for glob	and -o for subst-globs-only.

       _expand_alias
	      If  the word the cursor is on is an alias, it is expanded	and no
	      other completers are called.  The	types of aliases which are  to
	      be  expanded  can	 be controlled with the	styles regular,	global
	      and disabled.

	      This function is also a bindable command,	see the	section	`Bind-
	      able Commands' below.

       _extensions
	      If  the  cursor follows the string `*.', filename	extensions are
	      completed. The extensions	are taken from files in	current	direc-
	      tory  or	a  directory specified at the beginning	of the current
	      word. For	exact matches, completion  continues  to  allow	 other
	      completers  such	as _expand to expand the pattern. The standard
	      add-space	and prefix-hidden styles are observed.

       _external_pwds
	      Completes	current	directories of other zsh  processes  belonging
	      to the current user.

	      This  is intended	to be used via _generic, bound to a custom key
	      combination. Note	that pattern matching is enabled  so  matching
	      is performed similar to how it works with	the _match completer.

       _history
	      Complete	words  from  the  shell's command  history.  This com-
	      pleter can be controlled by the remove-all-dups, and sort	styles
	      as for the _history_complete_word	bindable command, see the sec-
	      tion `Bindable Commands' below and the section `Completion  Sys-
	      tem Configuration' above.

       _ignored
	      The  ignored-patterns  style  can	 be  set to a list of patterns
	      which are	compared against possible completions;	matching  ones
	      are  removed.   With  this  completer those matches can be rein-
	      stated, as if no ignored-patterns	style were set.	 The completer
	      actually generates its own list of matches; which	completers are
	      invoked is determined in the same	way as for  the	 _prefix  com-
	      pleter.  The single-ignored style	is also	available as described
	      above.

       _list  This completer allows the	insertion of matches to	be delayed un-
	      til  completion  is  attempted a second time without the word on
	      the line being changed.  On the first attempt, only the list  of
	      matches  will  be	shown.	It is affected by the styles condition
	      and word,	see  the  section  `Completion	System	Configuration'
	      above.

       _match This  completer  is intended to be used after the	_complete com-
	      pleter.  It behaves similarly but	the string on the command line
	      may be a pattern to match	against	trial completions.  This gives
	      the effect of the	GLOB_COMPLETE option.

	      Normally completion will be performed by taking the pattern from
	      the  line,  inserting a `*' at the cursor	position and comparing
	      the resulting pattern with the possible  completions  generated.
	      This  can	 be  modified  with the	match-original style described
	      above.

	      The generated matches will be offered in a menu  completion  un-
	      less  the	insert-unambiguous style is set	to `true'; see the de-
	      scription	above for other	options	for this style.

	      Note that	matcher	specifications defined globally	or used	by the
	      completion  functions (the styles	matcher-list and matcher) will
	      not be used.

       _menu  This completer was written as simple example  function  to  show
	      how  menu	 completion  can be enabled in shell code. However, it
	      has the notable effect of	disabling menu selection which can  be
	      useful  with  _generic  based  widgets. It should	be used	as the
	      first completer in the list.  Note that this is  independent  of
	      the  setting  of the MENU_COMPLETE option	and does not work with
	      the other	menu completion	widgets	such as	reverse-menu-complete,
	      or accept-and-menu-complete.

       _oldlist
	      This  completer controls how the standard	completion widgets be-
	      have when	there is an existing list  of  completions  which  may
	      have  been  generated  by	 a  special  completion	 (i.e. a sepa-
	      rately-bound completion command).	 It allows the	ordinary  com-
	      pletion  keys  to	 continue  to use the list of completions thus
	      generated, instead of producing a	new list of  ordinary  contex-
	      tual  completions.   It  should appear in	the list of completers
	      before any of the	widgets	which generate matches.	 It  uses  two
	      styles:  old-list	and old-menu, see the section `Completion Sys-
	      tem Configuration' above.

       _precommand
	      Complete an external command in word-separated arguments,	as for
	      exec and /usr/bin/env.

       _prefix
	      This  completer  can  be	used to	try completion with the	suffix
	      (everything after	the cursor) ignored.  In other words, the suf-
	      fix  will	 not be	considered to be part of the word to complete.
	      The effect is similar to the expand-or-complete-prefix command.

	      The completer style is used to decide which other	completers are
	      to  be  called to	generate matches.  If this style is unset, the
	      list of completers set for the current context is	 used  --  ex-
	      cept,  of	course,	the _prefix completer itself.  Furthermore, if
	      this completer appears more than once in the list	of  completers
	      only  those  completers not already tried	by the last invocation
	      of _prefix will be called.

	      For example, consider this global	completer style:

		     zstyle ':completion:*' completer \
			 _complete _prefix _correct _prefix:foo

	      Here, the	_prefix	completer tries	normal completion but ignoring
	      the  suffix.   If	that doesn't generate any matches, and neither
	      does the call to the _correct completer after it,	 _prefix  will
	      be called	a second time and, now only trying correction with the
	      suffix ignored.  On the second invocation	the completer part  of
	      the context appears as `foo'.

	      To use _prefix as	the last resort	and try	only normal completion
	      when it is invoked:

		     zstyle ':completion:*' completer _complete	... _prefix
		     zstyle ':completion::prefix:*' completer _complete

	      The add-space style is also respected.  If it is set  to	`true'
	      then  _prefix  will insert a space between the matches generated
	      (if any) and the suffix.

	      Note that	this completer is only useful if the  COMPLETE_IN_WORD
	      option is	set; otherwise,	the cursor will	be moved to the	end of
	      the current word before the completion code is called and	 hence
	      there will be no suffix.

       _user_expand
	      This  completer  behaves	similarly to the _expand completer but
	      instead  performs	 expansions  defined  by  users.   The	styles
	      add-space	 and sort styles specific to the _expand completer are
	      usable with _user_expand in addition  to	other  styles  handled
	      more generally by	the completion system.	The tag	all-expansions
	      is also available.

	      The expansion depends on the array style user-expand  being  de-
	      fined  for  the  current	context; remember that the context for
	      completers is less specific than that for	contextual  completion
	      as  the  full  context has not yet been determined.  Elements of
	      the array	may have one of	the following forms:

	      $hash

		     hash is the name of an associative	array.	Note  this  is
		     not  a  full  parameter  expression, merely a $, suitably
		     quoted to prevent immediate expansion,  followed  by  the
		     name  of  an  associative	array.	If the trial expansion
		     word matches a key	in hash, the  resulting	 expansion  is
		     the corresponding value.
	      _func

		     _func is the name of a shell function whose name must be-
		     gin with _	but is not otherwise special to	the completion
		     system.  The function is called with the trial word as an
		     argument.	If the word is to be  expanded,	 the  function
		     should  set the array reply to a list of expansions.  Op-
		     tionally, it can set REPLY	to a word that will be used as
		     a description for the set of expansions.  The return sta-
		     tus of the	function is irrelevant.
BINDABLE COMMANDS
       In addition to the context-dependent completions	 provided,  which  are
       expected	to work	in an intuitively obvious way, there are a few widgets
       implementing special behaviour which can	be bound separately  to	 keys.
       The following is	a list of these	and their default bindings.

       _bash_completions
	      This  function  is  used by two widgets, _bash_complete-word and
	      _bash_list-choices.  It exists  to  provide  compatibility  with
	      completion  bindings in bash.  The last character	of the binding
	      determines what is completed: `!', command names;	`$',  environ-
	      ment  variables;	`@',  host  names;  `/',  file names; `~' user
	      names.  In bash, the binding preceded by `\e' gives  completion,
	      and  preceded  by	`^X' lists options.  As	some of	these bindings
	      clash with standard zsh bindings,	only `\e~' and `^X~' are bound
	      by  default.   To	add the	rest, the following should be added to
	      .zshrc after compinit has	been run:

		     for key in	'!' '$'	'@' '/'	'~'; do
		       bindkey "\e$key"	_bash_complete-word
		       bindkey "^X$key"	_bash_list-choices
		     done

	      This includes the	bindings for `~' in  case  they	 were  already
	      bound  to	 something else; the completion	code does not override
	      user bindings.

       _correct_filename (^XC)
	      Correct the filename path	at the cursor position.	 Allows	up  to
	      six  errors in the name.	Can also be called with	an argument to
	      correct a	filename path, independently of	zle; the correction is
	      printed on standard output.

       _correct_word (^Xc)
	      Performs correction of the current argument using	the usual con-
	      textual completions as possible choices. This stores the	string
	      `correct-word'  in  the  function	 field of the context name and
	      then calls the _correct completer.

       _expand_alias (^Xa)
	      This function can	be used	as a completer and as a	bindable  com-
	      mand.   It  expands the word the cursor is on if it is an	alias.
	      The types	of alias expanded can be controlled  with  the	styles
	      regular, global and disabled.

	      When  used as a bindable command there is	one additional feature
	      that can be selected by setting the complete  style  to  `true'.
	      In  this	case,  if  the	word is	not the	name of	an alias, _ex-
	      pand_alias tries to complete the word to a full alias name with-
	      out  expanding it.  It leaves the	cursor directly	after the com-
	      pleted word so that invoking _expand_alias once more will	expand
	      the now-complete alias name.

       _expand_word (^Xe)
	      Performs expansion on the	current	word:  equivalent to the stan-
	      dard expand-word command,	but using the _expand completer.   Be-
	      fore  calling  it,  the  function	field of the context is	set to
	      `expand-word'.

       _generic
	      This function is not defined as a	widget and not	bound  by  de-
	      fault.  However, it can be used to define	a widget and will then
	      store the	name of	the widget in the function field of  the  con-
	      text and call the	completion system.  This allows	custom comple-
	      tion widgets with	their own set of style settings	to be  defined
	      easily.	For  example,  to define a widget that performs	normal
	      completion and starts menu selection:

		     zle -C foo	complete-word _generic
		     bindkey '...' foo
		     zstyle ':completion:foo:*'	menu yes select=1

	      Note in particular that the completer style may be set  for  the
	      context in order to change the set of functions used to generate
	      possible matches.	 If _generic is	called with  arguments,	 those
	      are  passed  through to _main_complete as	the list of completers
	      in place of those	defined	by the completer style.

       _history_complete_word (\e/)
	      Complete words from the shell's command history. This  uses  the
	      list, remove-all-dups, sort, and stop styles.

       _most_recent_file (^Xm)
	      Complete	the  name  of the most recently	modified file matching
	      the pattern on the command line (which may be blank).  If	 given
	      a	 numeric  argument  N, complete	the Nth	most recently modified
	      file.  Note the completion, if any, is always unique.

       _next_tags (^Xn)
	      This command alters the set of matches used to that for the next
	      tag,  or	set of tags, either as given by	the tag-order style or
	      as set by	default; these matches would otherwise not  be	avail-
	      able.   Successive  invocations of the command cycle through all
	      possible sets of tags.

       _read_comp (^X^R)
	      Prompt the user for a string, and	use that to perform completion
	      on  the  current	word.	There  are  two	 possibilities for the
	      string.  First, it can be	a set of words beginning `_', for  ex-
	      ample `_files -/', in which case the function with any arguments
	      will be called to	generate the completions.   Unambiguous	 parts
	      of  the  function	 name  will be completed automatically (normal
	      completion is not	available at this  point)  until  a  space  is
	      typed.

	      Second, any other	string will be passed as a set of arguments to
	      compadd and should hence be an expression	specifying what	should
	      be completed.

	      A	 very  restricted  set	of  editing commands is	available when
	      reading the string:  `DEL' and `^H' delete the  last  character;
	      `^U'  deletes  the  line,	 and `^C' and `^G' abort the function,
	      while `RET' accepts the completion.  Note	 the  string  is  used
	      verbatim	as  a command line, so arguments must be quoted	in ac-
	      cordance with standard shell rules.

	      Once a string has	been read, the next call  to  _read_comp  will
	      use  the existing	string instead of reading a new	one.  To force
	      a	new string to be read, call _read_comp with  a	numeric	 argu-
	      ment.

       _complete_debug (^X?)
	      This widget performs ordinary completion,	but captures in	a tem-
	      porary file a trace of the shell commands	executed by  the  com-
	      pletion  system.	 Each completion attempt gets its own file.  A
	      command to view each of these files is pushed  onto  the	editor
	      buffer stack.

       _complete_help (^Xh)
	      This  widget  displays  information about	the context names, the
	      tags, and	the completion functions used when completing  at  the
	      current  cursor position.	If given a numeric argument other than
	      1	(as in `ESC-2 ^Xh'), then the styles used and the contexts for
	      which they are used will be shown, too.

	      Note that	the information	about styles may be incomplete;	it de-
	      pends on the information available from the completion functions
	      called, which in turn is determined by the user's	own styles and
	      other settings.

       _complete_help_generic
	      Unlike other commands listed here, this must  be	created	 as  a
	      normal ZLE widget	rather than a completion widget	(i.e. with zle
	      -N).  It is used for generating help with	a widget bound to  the
	      _generic widget that is described	above.

	      If  this widget is created using the name	of the function, as it
	      is by default, then when executed	it will	read a	key  sequence.
	      This  is expected	to be bound to a call to a completion function
	      that uses	the _generic widget.  That widget  will	 be  executed,
	      and  information	provided  in  the  same	 format	that the _com-
	      plete_help widget	displays for contextual	completion.

	      If the widget's name contains debug, for example if it  is  cre-
	      ated as `zle -N _complete_debug_generic _complete_help_generic',
	      it will read and execute the keystring for a generic  widget  as
	      before, but then generate	debugging information as done by _com-
	      plete_debug for contextual completion.

	      If the widget's  name  contains  noread,	it  will  not  read  a
	      keystring	 but  instead  arrange	that the next use of a generic
	      widget run in the	same shell will	have the effect	 as  described
	      above.

	      The    widget    works	by   setting   the   shell   parameter
	      ZSH_TRACE_GENERIC_WIDGET which is	read by	 _generic.   Unsetting
	      the parameter cancels any	pending	effect of the noread form.

	      For example, after executing the following:

		     zle -N _complete_debug_generic _complete_help_generic
		     bindkey '^x:' _complete_debug_generic

	      typing `C-x :' followed by the key sequence for a	generic	widget
	      will cause trace output for that widget to be saved to a file.

       _complete_tag (^Xt)
	      This widget completes symbol tags	created	by the etags or	 ctags
	      programmes (note there is	no connection with the completion sys-
	      tem's tags) stored in a file TAGS, in the	format used by	etags,
	      or  tags,	 in the	format created by ctags.  It will look back up
	      the path hierarchy for the first occurrence of either  file;  if
	      both  exist,  the	 file  TAGS is preferred.  You can specify the
	      full path	to a TAGS or tags file by setting the parameter	$TAGS-
	      FILE  or	$tagsfile  respectively.  The corresponding completion
	      tags used	are etags and vtags, after emacs and vi	respectively.

UTILITY	FUNCTIONS
       Descriptions follow for utility functions that may be useful when writ-
       ing  completion	functions.   If	functions are installed	in subdirecto-
       ries, most of these reside in the Base subdirectory.  Like the  example
       functions  for commands in the distribution, the	utility	functions gen-
       erating matches all follow the convention of returning status  zero  if
       they  generated	completions  and  non-zero  if no matching completions
       could be	added.

       _absolute_command_paths
	      This function completes external commands	as absolute paths (un-
	      like  _command_names  -e	which  completes their basenames).  It
	      takes no arguments.

       _all_labels [ -x	] [ -12VJ ] tag	name descr [ command arg ... ]
	      This is a	convenient interface to	the _next_label	 function  be-
	      low,  implementing  the  loop  shown in the _next_label example.
	      The command  and	its  arguments	are  called  to	 generate  the
	      matches.	The options stored in the parameter name will automat-
	      ically be	inserted into the args passed to  the  command.	  Nor-
	      mally,  they  are	 put directly after the	command, but if	one of
	      the args is a single hyphen, they	are inserted  directly	before
	      that.   If  the  hyphen is the last argument, it will be removed
	      from the argument	list before the	command	is called.   This  al-
	      lows  _all_labels	 to  be	 used  in  almost  all cases where the
	      matches can be generated by a single call	to the compadd builtin
	      command or by a call to one of the utility functions.

	      For example:

		     local expl
		     ...
		     if	_requested foo;	then
		       ...
		       _all_labels foo expl '...' compadd ... -	$matches
		     fi

	      Will complete the	strings	from the matches parameter, using com-
	      padd with	additional options which  will	take  precedence  over
	      those generated by _all_labels.

       _alternative [ -O name ]	[ -C name ] spec ...
	      This  function is	useful in simple cases where multiple tags are
	      available.  Essentially it implements a loop like	 the  one  de-
	      scribed for the _tags function below.

	      The  tags	to use and the action to perform if a tag is requested
	      are described using the specs which are of  the  form:  `tag:de-
	      scr:action'.  The	tags are offered using _tags and if the	tag is
	      requested, the action is executed	with the given description de-
	      scr.   The actions are those accepted by the _arguments function
	      (described below), excluding the `->state' and `=...' forms.

	      For example, the action may be a simple function call:

		     _alternative \
			 'users:user:_users' \
			 'hosts:host:_hosts'

	      offers usernames and hostnames as	possible matches, generated by
	      the _users and _hosts functions respectively.

	      Like  _arguments,	 this function uses _all_labels	to execute the
	      actions, which will loop over all	sets of	 tags.	 Special  han-
	      dling  is	only required if there is an additional	valid tag, for
	      example inside a function	called from _alternative.

	      The option `-O name' is used in the same way as  by  the	_argu-
	      ments  function.	In other words,	the elements of	the name array
	      will be passed to	compadd	when executing an action.

	      Like _tags this function supports	the -C option to give  a  dif-
	      ferent name for the argument context field.

       _arguments [ -nswWCRS ] [ -A pat	] [ -O name ] [	-M matchspec ]
		  [ : ]	spec ...
       _arguments [ opt	... ] -- [ -l ]	[ -i pats ] [ -s pair ]
		  [ helpspec ...]
	      This  function  can be used to give a complete specification for
	      completion for a command whose arguments	follow	standard  UNIX
	      option and argument conventions.

	      Options Overview

	      Options  to _arguments itself must be in separate	words, i.e. -s
	      -w, not -sw.  The	options	are followed by	 specs	that  describe
	      options and arguments of the analyzed command.  To avoid ambigu-
	      ity, all options to _arguments itself may	be separated from  the
	      spec forms by a single colon.

	      The  `--'	form is	used to	intuit spec forms from the help	output
	      of the command being analyzed, and is described in detail	below.
	      The opts for the `--' form are otherwise the same	options	as the
	      first form.  Note	that `-s' following `--' has a distinct	 mean-
	      ing from `-s' preceding `--', and	both may appear.

	      The option switches -s, -S, -A, -w, and -W affect	how _arguments
	      parses the analyzed command line's options.  These switches  are
	      useful for commands with standard	argument parsing.

	      The options of _arguments	have the following meanings:

	      -n     With  this	 option, _arguments sets the parameter NORMARG
		     to	the position of	 the  first  normal  argument  in  the
		     $words  array, i.e. the position after the	end of the op-
		     tions.  If	that argument has not been reached, NORMARG is
		     set  to  -1.  The caller should declare `integer NORMARG'
		     if	the -n option is passed; otherwise  the	 parameter  is
		     not used.

	      -s     Enable option stacking for	single-letter options, whereby
		     multiple single-letter options may	 be  combined  into  a
		     single  word.  For	example, the two options `-x' and `-y'
		     may be combined into a single word	 `-xy'.	  By  default,
		     every  word corresponds to	a single option	name (`-xy' is
		     a single option named `xy').

		     Options beginning with a single hyphen or plus  sign  are
		     eligible  for  stacking; words beginning with two hyphens
		     are not.

		     Note that -s after	-- has a different meaning,  which  is
		     documented	 in  the segment entitled `Deriving spec forms
		     from the help output'.

	      -w     In	combination with -s, allow option stacking even	if one
		     or	 more  of the options take arguments.  For example, if
		     -x	takes an argument, with	no -s, `-xy' is	considered  as
		     a	single	(unhandled)  option; with -s, -xy is an	option
		     with the argument `y'; with both -s and -w,  -xy  is  the
		     option  -x	and the	option -y with arguments to -x (and to
		     -y, if it takes arguments)	still to  come	in  subsequent
		     words.

	      -W     This  option takes	-w a stage further:  it	is possible to
		     complete single-letter options  even  after  an  argument
		     that occurs in the	same word.  However, it	depends	on the
		     action performed whether options will really be completed
		     at	 this point.  For more control,	use a utility function
		     like _guard as part of the	action.

	      -C     Modify the	curcontext parameter for an action of the form
		     `->state'.	 This is discussed in detail below.

	      -R     Return  status 300	instead	of zero	when a $state is to be
		     handled, in the `->string'	syntax.

	      -S     Do	not complete options after a  `--'  appearing  on  the
		     line,  and	ignore the `--'.  For example, with -S,	in the
		     line

			    foobar -x -- -y

		     the `-x' is considered an option, the `-y'	is  considered
		     an	argument, and the `--' is considered to	be neither.

	      -A pat Do	 not complete options after the	first non-option argu-
		     ment on the line.	pat is a pattern matching all  strings
		     which  are	not to be taken	as arguments.  For example, to
		     make _arguments stop completing options after  the	 first
		     normal argument, but ignoring all strings starting	with a
		     hyphen even if they are not described by one of the  opt-
		     specs, the	form is	`-A "-*"'.

	      -O name
		     Pass the elements of the array name as arguments to func-
		     tions called to execute actions.  This  is	 discussed  in
		     detail below.

	      -M matchspec
		     Use  the match specification matchspec for	completing op-
		     tion names	and values.  The default matchspec allows par-
		     tial  word	completion after `_' and `-', such as complet-
		     ing `-f-b'	to `-foo-bar'.	The default matchspec is:
		     r:|[_-]=* r:|=*

	      specs: overview

	      Each of the following forms is a spec describing individual sets
	      of options or arguments on the command line being	analyzed.

	      n:message:action
	      n::message:action
		     This  describes  the  n'th	 normal	argument.  The message
		     will be printed above the matches generated and  the  ac-
		     tion  indicates  what  can	 be completed in this position
		     (see below).  If there are	two colons before the  message
		     the  argument  is optional.  If the message contains only
		     white space, nothing will be printed  above  the  matches
		     unless the	action adds an explanation string itself.

	      :message:action
	      ::message:action
		     Similar, but describes the	next argument, whatever	number
		     that happens to be.  If all arguments  are	 specified  in
		     this  form	 in the	correct	order the numbers are unneces-
		     sary.

	      *:message:action
	      *::message:action
	      *:::message:action
		     This describes how	arguments  (usually  non-option	 argu-
		     ments,  those  not	 beginning with	- or +)	are to be com-
		     pleted when neither of the	first two forms	was  provided.
		     Any number	of arguments can be completed in this fashion.

		     With two colons before the	message, the words special ar-
		     ray and the CURRENT special parameter are modified	to re-
		     fer  only to the normal arguments when the	action is exe-
		     cuted or evaluated.  With three colons before the message
		     they  are	modified to refer only to the normal arguments
		     covered by	this description.

	      optspec
	      optspec:...
		     This describes an option.	The colon  indicates  handling
		     for  one  or  more	 arguments to the option; if it	is not
		     present, the option is assumed to take no arguments.

		     The following forms are available for  the	 initial  opt-
		     spec, whether or not the option has arguments.

		     *optspec
			    Here  optspec is one of the	remaining forms	below.
			    This indicates the following optspec  may  be  re-
			    peated.   Otherwise	if the corresponding option is
			    already present on the command line	to the left of
			    the	cursor it will not be offered again.

		     -optname
		     +optname
			    In	the  simplest form the optspec is just the op-
			    tion name beginning	with a minus or	a  plus	 sign,
			    such as `-foo'.  The first argument	for the	option
			    (if	any) must follow as a separate	word  directly
			    after the option.

			    Either  of `-+optname' and `+-optname' can be used
			    to specify that -optname  and  +optname  are  both
			    valid.

			    In all the remaining forms,	the leading `-'	may be
			    replaced by	or paired with `+' in this way.

		     -optname-
			    The	first argument of the  option  must  come  di-
			    rectly  after  the	option	name in	the same word.
			    For	example, `-foo-:...' specifies that  the  com-
			    pleted   option   and   argument  will  look  like
			    `-fooarg'.

		     -optname+
			    The	first argument may  appear  immediately	 after
			    optname in the same	word, or may appear as a sepa-
			    rate  word	after  the   option.	For   example,
			    `-foo+:...'	 specifies  that  the completed	option
			    and	argument will look like	 either	 `-fooarg'  or
			    `-foo arg'.

		     -optname=
			    The	 argument  may	appear as the next word, or in
			    same word as the option name provided that	it  is
			    separated  from  it	by an equals sign, for example
			    `-foo=arg' or `-foo	arg'.

		     -optname=-
			    The	argument to the	option must  appear  after  an
			    equals sign	in the same word, and may not be given
			    in the next	argument.

		     optspec[explanation]
			    An explanation string may be appended  to  any  of
			    the	 preceding forms of optspec by enclosing it in
			    brackets, as in `-q[query operation]'.

			    The	verbose	style is used to  decide  whether  the
			    explanation	 strings are displayed with the	option
			    in a completion listing.

			    If no bracketed explanation	string	is  given  but
			    the	auto-description style is set and only one ar-
			    gument is described	for this optspec, the value of
			    the	style is displayed, with any appearance	of the
			    sequence `%d' in it	replaced by the	message	of the
			    first optarg that follows the optspec; see below.

		     It	 is  possible for options with a literal `+' or	`=' to
		     appear, but that character	must be	 quoted,  for  example
		     `-\+'.

		     Each  optarg  following  an  optspec must take one	of the
		     following forms:

		     :message:action
		     ::message:action
			    An argument	to the option; message and action  are
			    treated  as	 for ordinary arguments.  In the first
			    form, the argument is mandatory, and in the	second
			    form it is optional.

			    This  group	may be repeated	for options which take
			    multiple arguments.	 In other words, :message1:ac-
			    tion1:message2:action2  specifies  that the	option
			    takes two arguments.

		     :*pattern:message:action
		     :*pattern::message:action
		     :*pattern:::message:action
			    This describes multiple arguments.	Only the  last
			    optarg for an option taking	multiple arguments may
			    be given in	this form.  If the  pattern  is	 empty
			    (i.e.  :*:),  all  the remaining words on the line
			    are	to be completed	as described  by  the  action;
			    otherwise,	all  the  words	 up to and including a
			    word matching the pattern are to be	completed  us-
			    ing	the action.

			    Multiple  colons  are  treated  as for the `*:...'
			    forms for ordinary arguments:  when	the message is
			    preceded  by  two  colons, the words special array
			    and	the CURRENT  special  parameter	 are  modified
			    during  the	 execution or evaluation of the	action
			    to refer only to the words after the option.  When
			    preceded by	three colons, they are modified	to re-
			    fer	only to	the words covered by this description.

	      Any literal colon	in an optname, message,	or action must be pre-
	      ceded by a backslash, `\:'.

	      Each of the forms	above may be preceded by a list	in parentheses
	      of option	names and argument numbers.  If	the given option is on
	      the  command line, the options and arguments indicated in	paren-
	      theses  will  not	 be  offered.	For  example,  `(-two	-three
	      1)-one:...'  completes the option	`-one';	if this	appears	on the
	      command line, the	options	-two and -three	and the	first ordinary
	      argument will not	be completed after it.	`(-foo):...' specifies
	      an ordinary argument completion; -foo will not be	 completed  if
	      that argument is already present.

	      Other  items may appear in the list of excluded options to indi-
	      cate various other items that should not	be  applied  when  the
	      current specification is matched:	a single star (*) for the rest
	      arguments	(i.e. a	specification of the form  `*:...');  a	 colon
	      (:) for all normal (non-option-) arguments; and a	hyphen (-) for
	      all options.  For	example, if `(*)' appears before an option and
	      the  option  appears  on the command line, the list of remaining
	      arguments	(those shown in	the above table	beginning  with	 `*:')
	      will not be completed.

	      To aid in	reuse of specifications, it is possible	to precede any
	      of the forms above with `!'; then	the form  will	no  longer  be
	      completed,  although  if	the  option or argument	appears	on the
	      command line they	will be	skipped	as normal.  The	main  use  for
	      this is when the arguments are given by an array,	and _arguments
	      is called	repeatedly for more specific contexts:	on  the	 first
	      call  `_arguments	 $global_options'  is  used, and on subsequent
	      calls `_arguments	!$^global_options'.

	      specs: actions

	      In each of the forms above the action determines how completions
	      should  be generated.  Except for	the `->string' form below, the
	      action will be executed by calling the _all_labels  function  to
	      process  all  tag	labels.	 No special handling of	tags is	needed
	      unless a function	call introduces	a new one.

	      The functions called to execute actions will be called with  the
	      elements	of  the	 array	named by the `-O name' option as argu-
	      ments.  This can be used,	for example, to	pass the same  set  of
	      options for the compadd builtin to all actions.

	      The forms	for action are as follows.

	       (single unquoted	space)
		     This  is  useful  where an	argument is required but it is
		     not possible or desirable to  generate  matches  for  it.
		     The  message will be displayed but	no completions listed.
		     Note that even in this case the colon at the end  of  the
		     message  is needed; it may	only be	omitted	when neither a
		     message nor an action is given.

	      (item1 item2 ...)
		     One of a list of possible matches,	for example:

			    :foo:(foo bar baz)

	      ((item1\:desc1 ...))
		     Similar to	the above, but with descriptions for each pos-
		     sible  match.   Note the backslash	before the colon.  For
		     example,

			    :foo:((a\:bar b\:baz))

		     The matches will be listed	together with  their  descrip-
		     tions if the description style is set with	the values tag
		     in	the context.

	      ->string
		     In	this form, _arguments processes	the arguments and  op-
		     tions  and	 then  returns control to the calling function
		     with parameters set to indicate the state of  processing;
		     the  calling function then	makes its own arrangements for
		     generating	completions.  For example, functions that  im-
		     plement a state machine can use this type of action.

		     Where _arguments encounters action	in the `->string' for-
		     mat, it will strip	all leading  and  trailing  whitespace
		     from  string  and	set  the array state to	the set	of all
		     strings for which an action is to be performed.  The ele-
		     ments  of	the  array state_descr are assigned the	corre-
		     sponding message field from each optarg  containing  such
		     an	action.

		     By	default	and in common with all other well behaved com-
		     pletion functions,	_arguments returns status zero	if  it
		     was  able to add matches and non-zero otherwise. However,
		     if	the -R option is given,	_arguments will	instead	return
		     a status of 300 to	indicate that $state is	to be handled.

		     In	 addition  to $state and $state_descr, _arguments also
		     sets  the	global	parameters   `context',	  `line'   and
		     `opt_args'	 as  described	below,	and does not reset any
		     changes made to the special parameters such as PREFIX and
		     words.  This gives	the calling function the choice	of re-
		     setting these parameters or propagating changes in	them.

		     A function	calling	_arguments with	at  least  one	action
		     containing	 a `->string' must therefore declare appropri-
		     ate local parameters:

			    local context state	state_descr line
			    typeset -A opt_args

		     to	prevent	_arguments from	altering the  global  environ-
		     ment.

	      {eval-string}
		     A string in braces	is evaluated as	shell code to generate
		     matches.  If the eval-string itself does not  begin  with
		     an	opening	parenthesis or brace it	is split into separate
		     words before execution.

	      =	action
		     If	the action starts with `= ' (an	equals	sign  followed
		     by	 a  space), _arguments will insert the contents	of the
		     argument field of the current context as  the  new	 first
		     element  in  the  words  special  array and increment the
		     value of the CURRENT special parameter.  This has the ef-
		     fect  of  inserting a dummy word onto the completion com-
		     mand line while not changing the point at	which  comple-
		     tion is taking place.

		     This  is  most useful with	one of the specifiers that re-
		     strict the	words on the command line on which the	action
		     is	 to  operate  (the  two- and three-colon forms above).
		     One particular use	is when	an action itself causes	_argu-
		     ments  on a restricted range; it is necessary to use this
		     trick to insert an	 appropriate  command  name  into  the
		     range  for	 the  second  call to _arguments to be able to
		     parse the line.

	       word...
	      word...
		     This covers all forms other than those above.  If the ac-
		     tion  starts  with	 a  space, the remaining list of words
		     will be invoked unchanged.

		     Otherwise it will be  invoked  with  some	extra  strings
		     placed  after the first word; these are to	be passed down
		     as	options	to the compadd builtin.	 They ensure that  the
		     state specified by	_arguments, in particular the descrip-
		     tions of options and arguments, is	 correctly  passed  to
		     the  completion  command.	These additional arguments are
		     taken from	the array parameter `expl'; this will  be  set
		     up	 before	executing the action and hence may be referred
		     to	inside it, typically  in  an  expansion	 of  the  form
		     `$expl[@]'	which preserves	empty elements of the array.

	      During  the  performance	of the action the array	`line' will be
	      set to the normal	arguments from	the  command  line,  i.e.  the
	      words from the command line after	the command name excluding all
	      options and their	arguments.  Options are	stored in the associa-
	      tive  array `opt_args' with option names as keys and their argu-
	      ments as the values.  For	options	that have more than one	 argu-
	      ment  these  are	given as one string, separated by colons.  All
	      colons and backslashes in	the original  arguments	 are  preceded
	      with backslashes.

	      The  parameter  `context'	 is  set when returning	to the calling
	      function to perform an action of the form	`->string'.  It	is set
	      to an array of elements corresponding to the elements of $state.
	      Each element is a	suitable name for the argument	field  of  the
	      context: either a	string of the form `option-opt-n' for the n'th
	      argument of the option -opt, or a	 string	 of  the  form	`argu-
	      ment-n'  for  the	 n'th argument.	 For `rest' arguments, that is
	      those in the list	at the end not handled by position, n  is  the
	      string `rest'.  For example, when	completing the argument	of the
	      -o option, the name is `option-o-1', while for the second	normal
	      (non-option-) argument it	is `argument-2'.

	      Furthermore,  during  the	 evaluation  of	the action the context
	      name in the curcontext parameter is altered to append  the  same
	      string that is stored in the context parameter.

	      The  option -C tells _arguments to modify	the curcontext parame-
	      ter for an action	of the form `->state'.	This is	 the  standard
	      parameter	 used  to  keep	track of the current context.  Here it
	      (and not the context array) should be made local to the  calling
	      function	to avoid passing back the modified value and should be
	      initialised to the current value at the start of the function:

		     local curcontext="$curcontext"

	      This is useful where it is not possible for multiple  states  to
	      be valid together.

	      Grouping Options

	      Options  can  be grouped to simplify exclusion lists. A group is
	      introduced with `+' followed by a	name for the group in the sub-
	      sequent  word.  Whole groups can then be referenced in an	exclu-
	      sion list	or a group name	can be used  to	 disambiguate  between
	      two forms	of the same option. For	example:

		     _arguments	\
			 '(group2--x)-a' \
		       + group1	\
			 -m \
			 '(group2)-n' \
		       + group2	\
			 -x -y

	      If  the  name  of	a group	is specified in	the form `(name)' then
	      only one value from that group will ever be completed; more for-
	      mally,  all  specifications  are mutually	exclusive to all other
	      specifications in	that group. This is useful  for	 defining  op-
	      tions that are aliases for each other. For example:

		     _arguments	\
			 -a -b \
		       + '(operation)' \
			 {-c,--compress}'[compress]' \
			 {-d,--decompress}'[decompress]' \
			 {-l,--list}'[list]'

	      If  an  option  in  a  group  appears on the command line, it is
	      stored in	the associative	array `opt_args'  with	'group-option'
	      as a key.	 In the	example	above, a key `operation--c' is used if
	      the option `-c' is present on the	command	line.

	      Specifying Multiple Sets of Arguments

	      It is possible to	specify	multiple sets of options and arguments
	      with  the	 sets  separated  by single hyphens. This differs from
	      groups in	that sets are considered to be mutually	 exclusive  of
	      each other.

	      Specifications  before the first set and from any	group are com-
	      mon to all sets. For example:

		     _arguments	\
			 -a \
		       - set1 \
			 -c \
		       - set2 \
			 -d \
			 ':arg:(x2 y2)'

	      This defines two sets.  When the command line contains  the  op-
	      tion  `-c', the `-d' option and the argument will	not be consid-
	      ered possible completions.  When it contains `-d'	 or  an	 argu-
	      ment,  the  option  `-c' will not	be considered.	However, after
	      `-a' both	sets will still	be considered valid.

	      As for groups, the name of a set may appear in exclusion	lists,
	      either alone or preceding	a normal option	or argument specifica-
	      tion.

	      The completion code has to parse the command line	separately for
	      each set.	This can be slow so sets should	only be	used when nec-
	      essary.  A useful	alternative is often an	 option	 specification
	      with  rest-arguments  (as	in `-foo:*:...'); here the option -foo
	      swallows up all remaining	arguments as described by  the	optarg
	      definitions.

	      Deriving spec forms from the help	output

	      The  option `--' allows _arguments to work out the names of long
	      options that support the `--help'	option which  is  standard  in
	      many GNU commands.  The command word is called with the argument
	      `--help' and the output examined for option names.  Clearly,  it
	      can  be dangerous	to pass	this to	commands which may not support
	      this option as the behaviour of the command is unspecified.

	      In addition to options, `_arguments --' will try to  deduce  the
	      types   of   arguments  available	 for  options  when  the  form
	      `--opt=val' is valid.  It	is also	possible to provide  hints  by
	      examining	 the  help  text of the	command	and adding helpspec of
	      the form `pattern:message:action'; note  that  other  _arguments
	      spec  forms  are	not  used.  The	pattern	is matched against the
	      help text	for an option, and if it matches the message  and  ac-
	      tion  are	 used  as  for other argument specifiers.  The special
	      case of `*:' means both message and action are empty, which  has
	      the  effect of causing options having no description in the help
	      output to	be ordered in listings ahead of	options	 that  have  a
	      description.

	      For example:

		     _arguments	-- '*\*:toggle:(yes no)' \
				   '*=FILE*:file:_files' \
				   '*=DIR*:directory:_files -/'	\
				   '*=PATH*:directory:_files -/'

	      Here,  `yes'  and	 `no' will be completed	as the argument	of op-
	      tions whose description ends in a	star; file names will be  com-
	      pleted for options that contain the substring `=FILE' in the de-
	      scription; and directories will be completed for	options	 whose
	      description  contains  `=DIR' or `=PATH'.	 The last three	are in
	      fact the default and so need not be given	 explicitly,  although
	      it is possible to	override the use of these patterns.  A typical
	      help text	which uses this	feature	is:

		       -C, --directory=DIR	    change to directory	DIR

	      so that the above	specifications will cause  directories	to  be
	      completed	after `--directory', though not	after `-C'.

	      Note also	that _arguments	tries to find out automatically	if the
	      argument for an option is	optional.  This	can be	specified  ex-
	      plicitly by doubling the colon before the	message.

	      If the pattern ends in `(-)', this will be removed from the pat-
	      tern and the action will be used only directly  after  the  `=',
	      not  in the next word.  This is the behaviour of a normal	speci-
	      fication defined with the	form `=-'.

	      By default, the command (with the	option `--help') is run	 after
	      resetting	 all  the  locale  categories (except for LC_CTYPE) to
	      `C'.  If the localized help output is known to work, the	option
	      `-l' can be specified after the `_arguments --' so that the com-
	      mand is run in the current locale.

	      The `_arguments --' can be followed by the option	`-i  patterns'
	      to give patterns for options which are not to be completed.  The
	      patterns can be given as the name	of an array parameter or as  a
	      literal list in parentheses.  For	example,

		     _arguments	-- -i \
			 "(--(en|dis)able-FEATURE*)"

	      will  cause  completion to ignore	the options `--enable-FEATURE'
	      and `--disable-FEATURE' (this example is useful with GNU config-
	      ure).

	      The  `_arguments --' form	can also be followed by	the option `-s
	      pair' to describe	option aliases.	 The pair consists of  a  list
	      of alternating patterns and corresponding	replacements, enclosed
	      in parens	and quoted so that it forms a single argument word  in
	      the _arguments call.

	      For example, some	configure-script help output describes options
	      only as `--enable-foo', but the script also accepts the  negated
	      form `--disable-foo'.  To	allow completion of the	second form:

		     _arguments	-- -s "((#s)--enable- --disable-)"

	      Miscellaneous notes

	      Finally,	note  that _arguments generally	expects	to be the pri-
	      mary function handling any completion for	which it is used.   It
	      may  have	side effects which change the treatment	of any matches
	      added by other functions called after it.	 To combine _arguments
	      with  other  functions,  those functions should be called	either
	      before _arguments, as an action within a spec,  or  in  handlers
	      for `->state' actions.

	      Here is a	more general example of	the use	of _arguments:

		     _arguments	'-l+:left border:' \
				'-format:paper size:(letter A4)' \
				'*-copy:output file:_files::resolution:(300 600)' \
				':postscript file:_files -g \*.\(ps\|eps\)' \
				'*:page	number:'

	      This describes three options: `-l', `-format', and `-copy'.  The
	      first takes one argument described as `left border' for which no
	      completion will be offered because of the	empty action.  Its ar-
	      gument may come directly after the `-l' or it may	 be  given  as
	      the next word on the line.

	      The  `-format'  option  takes one	argument in the	next word, de-
	      scribed as `paper	size' for which	only the strings `letter'  and
	      `A4' will	be completed.

	      The `-copy' option may appear more than once on the command line
	      and takes	two arguments.	The first is  mandatory	 and  will  be
	      completed	as a filename.	The second is optional (because	of the
	      second colon before the description `resolution')	 and  will  be
	      completed	from the strings `300' and `600'.

	      The  last	two descriptions say what should be completed as argu-
	      ments.  The first	describes the first argument as	a  `postscript
	      file' and	makes files ending in `ps' or `eps' be completed.  The
	      last description gives all other arguments the description `page
	      numbers' but does	not offer completions.

       _cache_invalid cache_identifier
	      This  function returns status zero if the	completions cache cor-
	      responding to the	given cache identifier needs  rebuilding.   It
	      determines  this	by  looking  up	the cache-policy style for the
	      current context.	This should provide a function name  which  is
	      run  with	 the  full path	to the relevant	cache file as the only
	      argument.

	      Example:

		     _example_caching_policy ()	{
			 # rebuild if cache is more than a week	old
			 local -a oldp
			 oldp=(	"$1"(Nm+7) )
			 (( $#oldp ))
		     }

       _call_function return name [ arg	... ]
	      If a function name exists, it is called with the arguments args.
	      The  return  argument gives the name of a	parameter in which the
	      return status from the function name should be stored; if	return
	      is empty or a single hyphen it is	ignored.

	      The  return status of _call_function itself is zero if the func-
	      tion name	exists and was called and non-zero otherwise.

       _call_program [ -l ] [ -p ] tag string ...
	      This function provides a mechanism for the user to override  the
	      use  of an external command.  It looks up	the command style with
	      the supplied tag.	 If the	style is set, its value	is used	as the
	      command to execute.  The strings from the	call to	_call_program,
	      or from the style	if set,	are concatenated with  spaces  between
	      them  and	 the resulting string is evaluated.  The return	status
	      is the return status of the command called.

	      By default, the command is run in	an environment where  all  the
	      locale  categories  (except  for	LC_CTYPE)  are reset to	`C' by
	      calling the utility function _comp_locale	(see  below).  If  the
	      option  `-l'  is	given, the command is run with the current lo-
	      cale.

	      If the option `-p' is supplied it	 indicates  that  the  command
	      output  is  influenced by	the permissions	it is run with.	If the
	      gain-privileges style is set to true,  _call_program  will  make
	      use of commands such as sudo, if present on the command-line, to
	      match the	permissions to whatever	the final command is likely to
	      run  under.  When	 looking  up  the  gain-privileges and command
	      styles, the command component of the  zstyle  context  will  end
	      with a slash (`/') followed by the command that would be used to
	      gain privileges.

       _combination [ -s pattern ] tag style spec ... field opts ...
	      This function is used to complete	combinations of	 values,   for
	      example  pairs  of  hostnames and	usernames.  The	style argument
	      gives the	style which defines the	pairs; it is looked  up	 in  a
	      context with the tag specified.

	      The style	name consists of field names separated by hyphens, for
	      example `users-hosts-ports'.  For	each field for a value is  al-
	      ready  known,  a spec of the form	`field=pattern'	is given.  For
	      example, if the command line so far specifies a user `pws',  the
	      argument `users=pws' should appear.

	      The  next	 argument  with	no equals sign is taken	as the name of
	      the field	for which completions should be	generated  (presumably
	      not one of the fields for	which the value	is known).

	      The matches generated will be taken from the value of the	style.
	      These should contain the possible	values for the combinations in
	      the  appropriate	order  (users,	hosts,	ports  in  the example
	      above).  The values for the different fields  are	 separated  by
	      colons.	This can be altered with the option -s to _combination
	      which specifies a	pattern.  Typically this is a character	class,
	      as for example `-s "[:@]"' in the	case of	the users-hosts	style.
	      Each `field=pattern'  specification  restricts  the  completions
	      which apply to elements of the style with	appropriately matching
	      fields.

	      If no style with the given name is defined for the given tag, or
	      if  none	of  the	strings	in style's value match,	but a function
	      name of the required field preceded by an	underscore is defined,
	      that function will be called to generate the matches.  For exam-
	      ple, if there is no `users-hosts-ports' or no matching  hostname
	      when  a  host  is	required, the function `_hosts'	will automati-
	      cally be called.

	      If the same name is used for more	than one field,	 in  both  the
	      `field=pattern'  and  the	 argument  that	 gives the name	of the
	      field to be completed, the number	of the	field  (starting  with
	      one)  may	 be  given after the fieldname,	separated from it by a
	      colon.

	      All arguments after the required field name are passed  to  com-
	      padd  when  generating  matches  from the	style value, or	to the
	      functions	for the	fields if they are called.

       _command_names [	-e | - ]
	      This function completes words that are valid  at	command	 posi-
	      tion:  names  of	aliases, builtins, hashed commands, functions,
	      and so on.  With the -e flag,  only  hashed  commands  are  com-
	      pleted.  The - flag is ignored.

       _comp_locale
	      This  function  resets  all  the	locale	categories  other than
	      LC_CTYPE to `C' so that the output from external commands	can be
	      easily  analyzed	by the completion system. LC_CTYPE retains the
	      current value (taking LC_ALL and LANG  into  account),  ensuring
	      that  non-ASCII characters in file names are still handled prop-
	      erly.

	      This function should normally be run only	in a subshell, because
	      the  new	locale	is  exported to	the environment. Typical usage
	      would be `$(_comp_locale;	command	...)'.

       _completers [ -p	]
	      This function completes names of completers.

	      -p     Include the leading underscore (`_') in the matches.

       _describe [-12JVx] [ -oO	| -t tag ] descr name1 [ name2 ] [ opt ... ]
		 [ -- name1 [ name2 ] [	opt ...	] ... ]
	      This function associates completions with	descriptions.	Multi-
	      ple  groups  separated  by  -- can be supplied, potentially with
	      different	completion options opts.

	      The descr	is taken as a string to	display	above the  matches  if
	      the  format style	for the	descriptions tag is set.  This is fol-
	      lowed by one or two names	of arrays followed by options to  pass
	      to  compadd.   The array name1 contains the possible completions
	      with their descriptions in  the  form  `completion:description'.
	      Any  literal  colons  in	completion must	be quoted with a back-
	      slash.  If a name2 is given, it should have the same  number  of
	      elements	as  name1; in this case	the corresponding elements are
	      added as possible	completions instead of the completion  strings
	      from  name1.   The  completion list will retain the descriptions
	      from name1.  Finally, a set of completion	options	can appear.

	      If the option  `-o'  appears  before  the	 first	argument,  the
	      matches  added will be treated as	names of command options (N.B.
	      not shell	options), typically following a	`-', `--'  or  `+'  on
	      the  command  line.  In this case	_describe uses the prefix-hid-
	      den, prefix-needed and verbose styles to find out	if the strings
	      should be	added as completions and if the	descriptions should be
	      shown.  Without the `-o' option, only the	verbose	style is  used
	      to  decide  how descriptions are shown.  If `-O' is used instead
	      of `-o', command options are completed as	 above	but  _describe
	      will not handle the prefix-needed	style.

	      With the -t option a tag can be specified.  The default is `val-
	      ues' or, if the -o option	is given, `options'.

	      The options -1, -2, -J, -V, -x are passed	to _next_label.

	      If selected by the list-grouped style, strings with the same de-
	      scription	will appear together in	the list.

	      _describe	uses the _all_labels function to generate the matches,
	      so it does not need to appear inside a loop over tag labels.

       _description [ -x ] [ -12VJ ] tag name descr [ spec ... ]
	      This function is not to be confused with the previous one; it is
	      used  as	a helper function for creating options to compadd.  It
	      is buried	inside many of the higher level	 completion  functions
	      and so often does	not need to be called directly.

	      The  styles listed below are tested in the current context using
	      the given	tag.  The resulting options for	compadd	are  put  into
	      the  array  named	 name  (this is	traditionally `expl', but this
	      convention is not	enforced).  The	 description  for  the	corre-
	      sponding set of matches is passed	to the function	in descr.

	      The styles tested	are: format, hidden, matcher, ignore-line, ig-
	      nored-patterns, group-name and sort.  The	format style is	 first
	      tested for the given tag and then	for the	descriptions tag if no
	      value was	found, while the remainder are only tested for the tag
	      given  as	 the  first  argument.	The function also calls	_setup
	      which tests some more styles.

	      The string returned by the format	style (if any) will  be	 modi-
	      fied so that the sequence	`%d' is	replaced by the	descr given as
	      the third	argument without any leading or	trailing white	space.
	      If,  after  removing  the	 white	space,	the descr is the empty
	      string, the format style will not	be used	and  the  options  put
	      into the name array will not contain an explanation string to be
	      displayed	above the matches.

	      If _description is called	with more than	three  arguments,  the
	      additional specs should be of the	form `char:str'.  These	supply
	      escape sequence replacements for the format style: every appear-
	      ance of `%char' will be replaced by string.

	      If  the  -x  option  is given, the description will be passed to
	      compadd using the	-x option instead of  the  default  -X.	  This
	      means  that  the description will	be displayed even if there are
	      no corresponding matches.

	      The options placed  in  the  array  name	take  account  of  the
	      group-name  style,  so  matches  are  placed in a	separate group
	      where necessary.	The group normally has its elements sorted (by
	      passing  the  option  -J	to compadd), but if an option starting
	      with `-V', `-J', `-1', or	`-2' is	passed to  _description,  that
	      option  will be included in the array.  Hence it is possible for
	      the completion group to be unsorted by giving the	 option	 `-V',
	      `-1V', or	`-2V'.

	      In most cases, the function will be used like this:

		     local expl
		     _description files	expl file
		     compadd "$expl[@]"	- "$files[@]"

	      Note  the	use of the parameter expl, the hyphen, and the list of
	      matches.	Almost all calls to compadd within the completion sys-
	      tem  use	a  similar  format;  this  ensures that	user-specified
	      styles are correctly passed down to the builtins which implement
	      the internals of completion.

       _dir_list [ -s sep ] [ -S ]
	      Complete a list of directory names separated by colons (the same
	      format as	$PATH).

	      -s sep Use sep as	separator between items.  sep  defaults	 to  a
		     colon (`:').

	      -S     Add  sep instead of slash (`/') as	an autoremoveable suf-
		     fix.

       _dispatch context string	...
	      This sets	the current context to context and looks  for  comple-
	      tion  functions  to  handle  this	context	by hunting through the
	      list of command names or special contexts	 (as  described	 above
	      for compdef) given as strings.  The first	completion function to
	      be defined for one of the	contexts in the	list is	used to	gener-
	      ate  matches.   Typically, the last string is -default- to cause
	      the function for default completion to be	used as	a fallback.

	      The function sets	the parameter $service	to  the	 string	 being
	      tried,  and  sets	 the context/command field (the	fourth)	of the
	      $curcontext parameter to the context given as  the  first	 argu-
	      ment.

       _email_addresses	[ -c ] [ -n plugin ]
	      Complete email addresses.	 Addresses are provided	by plugins.

	      -c     Complete  bare  localhost@domain.tld addresses, without a
		     name part or a  comment.	Without	 this  option,	RFC822
		     `Firstname	Lastname <address>' strings are	completed.

	      -n plugin
		     Complete aliases from plugin.

	      The following plugins are	available by default: _email-ldap (see
	      the filter style), _email-local  (completes  user@hostname  Unix
	      addresses),  _email-mail	(completes  aliases  from  ~/.mailrc),
	      _email-mush, _email-mutt,	and _email-pine.

	      Addresses	from the _email-foo plugin are	added  under  the  tag
	      `email-foo'.

	      Writing plugins

	      Plugins  are  written  as	separate functions with	names starting
	      with `_email-'.  They are	invoked	with the -c option and compadd
	      options.	 They should either do their own completion or set the
	      $reply array to a	list of	`alias:address'	 elements  and	return
	      300.  New	plugins	will be	picked up and run automatically.

       _files The function _files is a wrapper around _path_files. It supports
	      all of the same functionality, with  some	 enhancements  --  no-
	      tably,  it  respects  the	 list-dirs-first  style, and it	allows
	      users to override	the behaviour of the -g	and  -/	 options  with
	      the  file-patterns  style.  _files should	therefore be preferred
	      over _path_files in most cases.

	      This function  accepts  the  full	 set  of  options  allowed  by
	      _path_files, described below.

       _gnu_generic
	      This function is a simple	wrapper	around the _arguments function
	      described	above.	It can be used to determine automatically  the
	      long  options  understood	 by  commands that produce a list when
	      passed the option	`--help'.  It is intended  to  be  used	 as  a
	      top-level	completion function in its own right.  For example, to
	      enable option completion for the commands	foo and	bar, use

		     compdef _gnu_generic foo bar

	      after the	call to	compinit.

	      The completion system as supplied	is conservative	in its use  of
	      this  function, since it is important to be sure the command un-
	      derstands	the option `--help'.

       _guard [	options	] pattern descr
	      This function displays descr if pattern matches the string to be
	      completed.   It  is  intended  to	 be used in the	action for the
	      specifications passed to _arguments and similar functions.

	      The return status	is zero	if the message was displayed  and  the
	      word to complete is not empty, and non-zero otherwise.

	      The  pattern may be preceded by any of the options understood by
	      compadd that are passed down from	_description, namely  -M,  -J,
	      -V,  -1,	-2,  -n,  -F and -X.  All of these options will	be ig-
	      nored.  This fits	in conveniently	with the argument-passing con-
	      ventions of actions for _arguments.

	      As  an  example,	consider  a  command taking the	options	-n and
	      -none, where -n must be followed by a numeric value in the  same
	      word.  By	using:

		     _arguments	'-n-: :_guard "[0-9]#" "numeric	value"'	'-none'

	      _arguments  can  be  made	 to  both display the message `numeric
	      value' and complete options after	`-n<TAB>'.  If the `-n'	is al-
	      ready  followed  by  one	or  more digits	(the pattern passed to
	      _guard) only the message will be displayed; if the `-n' is  fol-
	      lowed by another character, only options are completed.

       _message	[ -r12 ] [ -VJ group ] descr
       _message	-e [ tag ] descr
	      The  descr  is used in the same way as the third argument	to the
	      _description function, except that the resulting string will al-
	      ways  be	shown  whether or not matches were generated.  This is
	      useful for displaying a help message in places where no  comple-
	      tions can	be generated.

	      The  format  style  is  examined with the	messages tag to	find a
	      message; the usual tag, descriptions, is used only if the	 style
	      is not set with the former.

	      If  the -r option	is given, no style is used; the	descr is taken
	      literally	as the string to display.  This	is  most  useful  when
	      the descr	comes from a pre-processed argument list which already
	      contains an expanded description.	 Note that  this  option  does
	      not disable the `%'-sequence parsing done	by compadd.

	      The  -12VJ options and the group are passed to compadd and hence
	      determine	the group the message string is	added to.

	      The second -e form gives a description for completions with  the
	      tag  tag	to be shown even if there are no matches for that tag.
	      This form	is called by _arguments	in the event that there	is  no
	      action  for an option specification.  The	tag can	be omitted and
	      if so the	tag is taken from the parameter	$curtag; this is main-
	      tained by	the completion system and so is	usually	correct.  Note
	      that if there are	no  matches  at	 the  time  this  function  is
	      called, compstate[insert]	is cleared, so additional matches gen-
	      erated later are not inserted on the command line.

       _multi_parts [ -i ] sep array
	      The argument sep is a separator character.  The array may	be ei-
	      ther  the	 name  of an array parameter or	a literal array	in the
	      form `(foo bar)',	a parenthesised	list  of  words	 separated  by
	      whitespace.   The	 possible completions are the strings from the
	      array.  However, each chunk delimited by sep will	 be  completed
	      separately.  For example,	the _tar function uses `_multi_parts /
	      patharray' to complete partial file paths	from the  given	 array
	      of complete file paths.

	      The  -i option causes _multi_parts to insert a unique match even
	      if that requires multiple	separators to be  inserted.   This  is
	      not  usually  the	expected behaviour with	filenames, but certain
	      other types of completion, for example those with	a fixed	set of
	      possibilities, may be more suited	to this	form.

	      Like  other  utility  functions, this function accepts the `-V',
	      `-J', `-1', `-2',	`-n', `-f',  `-X',  `-M',  `-P',  `-S',	 `-r',
	      `-R', and	`-q' options and passes	them to	the compadd builtin.

       _next_label [ -x	] [ -12VJ ] tag	name descr [ option ...	]
	      This  function  is used to implement the loop over different tag
	      labels for a particular tag as described above for the tag-order
	      style.   On each call it checks to see if	there are any more tag
	      labels; if there is it returns status zero, otherwise  non-zero.
	      As  this	function requires a current tag	to be set, it must al-
	      ways follow a call to _tags or _requested.

	      The -x12VJ options and the first three arguments are  passed  to
	      the  _description	 function.   Where appropriate the tag will be
	      replaced by a tag	label in this call.  Any description given  in
	      the  tag-order  style  is	 preferred  to	the  descr  passed  to
	      _next_label.

	      The options given	after the descr	are set	in the parameter given
	      by name, and hence are to	be passed to compadd or	whatever func-
	      tion is called to	add the	matches.

	      Here is a	typical	use of this function for  the  tag  foo.   The
	      call to _requested determines if tag foo is required at all; the
	      loop over	_next_label handles any	labels defined for the tag  in
	      the tag-order style.

		     local expl	ret=1
		     ...
		     if	_requested foo;	then
		       ...
		       while _next_label foo expl '...'; do
			 compadd "$expl[@]" ...	&& ret=0
		       done
		       ...
		     fi
		     return ret

       _normal [ -P | -p precommand ]
	      This  is	the standard function called to	handle completion out-
	      side any special -context-.  It is called	both to	 complete  the
	      command  word and	also the arguments for a command.  In the sec-
	      ond case,	_normal	looks for a special completion for  that  com-
	      mand,  and  if there is none it uses the completion for the -de-
	      fault- context.

	      A	second use is to reexamine the command line specified  by  the
	      $words  array  and  the $CURRENT parameter after those have been
	      modified.	 For example, the  function  _precommand,  which  com-
	      pletes  after  precommand	 specifiers such as nohup, removes the
	      first word from the words	array, decrements the CURRENT  parame-
	      ter,  then calls `_normal	-p $service'.  The effect is that `no-
	      hup cmd ...' is treated in the same way as `cmd ...'.

	      -P     Reset the list of precommands. This option	should be used
		     if	 completing  a command line which allows internal com-
		     mands (e.g. builtins and functions) regardless  of	 prior
		     precommands (e.g. `zsh -c').

	      -p precommand
		     Append precommand to the list of precommands. This	option
		     should be used in nearly all cases	in which -P is not ap-
		     plicable.

	      If  the command name matches one of the patterns given by	one of
	      the options -p or	-P to compdef,	the  corresponding  completion
	      function	is called and then the parameter _compskip is checked.
	      If it is set completion is terminated at that point even	if  no
	      matches  have  been  found.   This  is the same effect as	in the
	      -first- context.

       _options
	      This can be used to complete the names  of  shell	 options.   It
	      provides	a  matcher  specification that ignores a leading `no',
	      ignores underscores and allows upper-case	letters	to match their
	      lower-case   counterparts	  (for	 example,   `glob',  `noglob',
	      `NO_GLOB'	are all	completed).  Any arguments are	propagated  to
	      the compadd builtin.

       _options_set and	_options_unset
	      These  functions	complete  only	set or unset options, with the
	      same matching specification used in the _options function.

	      Note that	you need to uncomment a	few lines  in  the  _main_com-
	      plete  function for these	functions to work properly.  The lines
	      in question are used to store the	option settings	in effect  be-
	      fore  the	 completion  widget locally sets the options it	needs.
	      Hence these functions are	not generally used by  the  completion
	      system.

       _parameters
	      This is used to complete the names of shell parameters.

	      The  option  `-g	pattern'  limits  the completion to parameters
	      whose type matches the pattern.  The type	of a parameter is that
	      shown by `print ${(t)param}', hence judicious use	of `*' in pat-
	      tern is probably necessary.

	      All other	arguments are passed to	the compadd builtin.

       _path_files
	      This function is used throughout the completion system  to  com-
	      plete  filenames.	  It  allows completion	of partial paths.  For
	      example, the string `/u/i/s/sig' may be completed	 to  `/usr/in-
	      clude/sys/signal.h'.

	      The options accepted by both _path_files and _files are:

	      -f     Complete all filenames.  This is the default.

	      -/     Specifies that only directories should be completed.

	      -g pattern
		     Specifies	that only files	matching the pattern should be
		     completed.

	      -W paths
		     Specifies path prefixes that are to be prepended  to  the
		     string  from  the	command	line to	generate the filenames
		     but that should not be inserted as	completions nor	 shown
		     in	 completion  listings.	Here, paths may	be the name of
		     an	array parameter, a literal list	of paths  enclosed  in
		     parentheses or an absolute	pathname.

	      -F ignored-files
		     This  behaves as for the corresponding option to the com-
		     padd builtin.  It gives direct control over  which	 file-
		     names  should  be ignored.	 If the	option is not present,
		     the ignored-patterns style	is used.

	      Both _path_files and _files also accept  the  following  options
	      which are	passed to compadd: `-J', `-V', `-1', `-2', `-n', `-X',
	      `-M', `-P', `-S',	`-q', `-r', and	`-R'.

	      Finally, the _path_files function	 uses the styles  expand,  am-
	      biguous,	special-dirs,  list-suffixes  and  file-sort described
	      above.

       _pick_variant [ -b builtin-label	] [ -c command ] [ -r name ]
		     label=pattern ... label [ arg ... ]
	      This function is used to resolve situations where	a single  com-
	      mand  name  requires  more than one type of handling, either be-
	      cause it has more	than one variant or because there  is  a  name
	      clash between two	different commands.

	      The  command to run is taken from	the first element of the array
	      words unless this	is overridden by the option -c.	 This  command
	      is  run  and  its	 output	is compared with a series of patterns.
	      Arguments	to be passed to	the command can	be  specified  at  the
	      end after	all the	other arguments.  The patterns to try in order
	      are given	by the arguments label=pattern;	if the output of `com-
	      mand  arg	 ...'  contains	pattern, then label is selected	as the
	      label for	the command variant.  If none of the  patterns	match,
	      the final	command	label is selected and status 1 is returned.

	      If the `-b builtin-label'	is given, the command is tested	to see
	      if it is provided	as a shell builtin,  possibly  autoloaded;  if
	      so,  the	label  builtin-label  is selected as the label for the
	      variant.

	      If the `-r name' is given, the label picked is stored in the pa-
	      rameter named name.

	      The  results are also cached in the _cmd_variant associative ar-
	      ray indexed by the name of the command run.

       _regex_arguments	name spec ...
	      This function generates a	completion function name which matches
	      the  specifications  specs,  a set of regular expressions	as de-
	      scribed below.  After  running  _regex_arguments,	 the  function
	      name should be called as a normal	completion function.  The pat-
	      tern to be matched is given by the contents of the  words	 array
	      up  to  the  current  cursor  position joined together with null
	      characters; no quotation is applied.

	      The arguments are	grouped	as sets	of alternatives	 separated  by
	      `|',  which  are	tried  one  after the other until one matches.
	      Each alternative consists	of a one or more specifications	 which
	      are  tried  left	to  right,  with  each	pattern	 matched being
	      stripped in turn from the	command	line being tested,  until  all
	      of  the  group  succeeds or until	one fails; in the latter case,
	      the next alternative is tried.  This structure can  be  repeated
	      to  arbitrary depth by using parentheses;	matching proceeds from
	      inside to	outside.

	      A	special	procedure is applied if	no test	succeeds but  the  re-
	      maining command line string contains no null character (implying
	      the remaining word is the	one for	which completions  are	to  be
	      generated).   The	completion target is restricted	to the remain-
	      ing word and any actions for the corresponding patterns are exe-
	      cuted.   In this case, nothing is	stripped from the command line
	      string.  The order of evaluation of the actions  can  be	deter-
	      mined  by	 the tag-order style; the various formats supported by
	      _alternative can be used in action.  The descr is	used for  set-
	      ting up the array	parameter expl.

	      Specification  arguments	take  one of following forms, in which
	      metacharacters such as `(', `)', `#' and `|' should be quoted.

	      /pattern/	[%lookahead%] [-guard] [:tag:descr:action]
		     This is a single primitive	component.  The	function tests
		     whether   the  combined  pattern  `(#b)((#B)pattern)look-
		     ahead*' matches the command line string.  If so,  `guard'
		     is	 evaluated and its return status is examined to	deter-
		     mine if the test has succeeded.  The pattern string  `[]'
		     is	 guaranteed  never  to	match.	 The  lookahead	is not
		     stripped from the command line before the next pattern is
		     examined.

		     The  argument  starting with : is used in the same	manner
		     as	an argument to _alternative.

		     A component is used as follows: pattern is	tested to  see
		     if	 the component already exists on the command line.  If
		     it	does, any following  specifications  are  examined  to
		     find  something  to  complete.  If	a component is reached
		     but no such pattern exists	yet on the command  line,  the
		     string  containing	the action is used to generate matches
		     to	insert at that point.

	      /pattern/+ [%lookahead%] [-guard]	[:tag:descr:action]
		     This is similar to	`/pattern/ ...'	but the	left  part  of
		     the command line string (i.e. the part already matched by
		     previous patterns)	is also	considered part	of the comple-
		     tion target.

	      /pattern/- [%lookahead%] [-guard]	[:tag:descr:action]
		     This is similar to	`/pattern/ ...'	but the	actions	of the
		     current and previously matched patterns are ignored  even
		     if	the following `pattern'	matches	the empty string.

	      (	spec )
		     Parentheses may be	used to	groups specs; note each	paren-
		     thesis is a single	argument to _regex_arguments.

	      spec # This allows any number of repetitions of spec.

	      spec spec
		     The two specs are to be matched one after	the  other  as
		     described above.

	      spec | spec
		     Either of the two specs can be matched.

	      The  function  _regex_words  can be used as a helper function to
	      generate matches for a set of alternative	 words	possibly  with
	      their own	arguments as a command line argument.

	      Examples:

		     _regex_arguments _tst /$'[^\0]#\0'/ \
			 /$'[^\0]#\0'/ :'compadd aaa'

	      This  generates  a  function _tst	that completes aaa as its only
	      argument.	 The tag and description  for  the  action  have  been
	      omitted for brevity (this	works but is not recommended in	normal
	      use).  The first component matches the command  word,  which  is
	      arbitrary; the second matches  any argument.  As the argument is
	      also arbitrary, any following component would not	depend on  aaa
	      being present.

		     _regex_arguments _tst /$'[^\0]#\0'/ \
			 /$'aaa\0'/ :'compadd aaa'

	      This  is	a  more	 typical use; it is similar, but any following
	      patterns would only match	if aaa was present as the first	 argu-
	      ment.

		     _regex_arguments _tst /$'[^\0]#\0'/ \( \
			 /$'aaa\0'/ :'compadd aaa' \
			 /$'bbb\0'/ :'compadd bbb' \) \#

	      In  this	example, an indefinite number of command arguments may
	      be completed.  Odd arguments are completed as aaa	and even argu-
	      ments  as	 bbb.	Completion fails unless	the set	of aaa and bbb
	      arguments	before the current one is matched correctly.

		     _regex_arguments _tst /$'[^\0]#\0'/ \
			 \( /$'aaa\0'/ :'compadd aaa' \| \
			 /$'bbb\0'/ :'compadd bbb' \) \#

	      This is similar, but either aaa or bbb may be completed for  any
	      argument.	 In this case _regex_words could be used to generate a
	      suitable expression for the arguments.

       _regex_words tag	description spec ...
	      This  function  can  be  used  to	 generate  arguments  for  the
	      _regex_arguments	command	 which	may  be	 inserted at any point
	      where a set of rules is expected.	 The tag and description  give
	      a	 standard  tag	and description	pertaining to the current con-
	      text.  Each spec contains	two or three arguments separated by  a
	      colon: note that there is	no leading colon in this case.

	      Each  spec  gives	one of a set of	words that may be completed at
	      this point, together with	arguments.  It is thus roughly equiva-
	      lent  to the _arguments function when used in normal (non-regex)
	      completion.

	      The part of the spec before the first colon is the  word	to  be
	      completed.   This	 may  contain a	*; the entire word, before and
	      after the	* is completed,	but only the text before the * is  re-
	      quired  for the context to be matched, so	that further arguments
	      may be completed after the abbreviated form.

	      The second part of spec is a description for the word being com-
	      pleted.

	      The  optional third part of the spec describes how words follow-
	      ing the one being	completed are themselves to be completed.   It
	      will be evaluated	in order to avoid problems with	quoting.  This
	      means that typically it contains a reference to  an  array  con-
	      taining previously generated regex arguments.

	      The  option  -t term specifies a terminator for the word instead
	      of the usual space.  This	is handled as an auto-removable	suffix
	      in the manner of the option -s sep to _values.

	      The  result  of  the processing by _regex_words is placed	in the
	      array reply, which should	be made	local to the calling function.
	      If the set of words and arguments	may be matched repeatedly, a #
	      should be	appended to the	generated array	at that	point.

	      For example:

		     local -a reply
		     _regex_words mydb-commands	'mydb commands'	\
		       'add:add	an entry to mydb:$mydb_add_cmds' \
		       'show:show entries in mydb'
		     _regex_arguments _mydb "$reply[@]"
		     _mydb "$@"

	      This shows a completion function for a command mydb which	 takes
	      two  command  arguments, add and show.  show takes no arguments,
	      while the	arguments for add have already been prepared in	an ar-
	      ray   mydb_add_cmds,  quite  possibly  by	 a  previous  call  to
	      _regex_words.

       _requested [ -x ] [ -12VJ ] tag [ name descr [ command [	arg ...	] ]
	      This function is called to decide	whether	a tag  already	regis-
	      tered  by	 a call	to _tags (see below) has been requested	by the
	      user and hence completion	should be performed for	 it.   It  re-
	      turns  status  zero  if the tag is requested and non-zero	other-
	      wise.  The function is typically used as part  of	 a  loop  over
	      different	tags as	follows:

		     _tags foo bar baz
		     while _tags; do
		       if _requested foo; then
			 ... # perform completion for foo
		       fi
		       ... # test the tags bar and baz in the same way
		       ... # exit loop if matches were generated
		     done

	      Note  that  the  test  for whether matches were generated	is not
	      performed	until the end of the _tags loop.  This is so that  the
	      user  can	set the	tag-order style	to specify a set of tags to be
	      completed	at the same time.

	      If name and descr	are given, _requested calls  the  _description
	      function	with  these arguments together with the	options	passed
	      to _requested.

	      If command is given, the _all_labels function will be called im-
	      mediately	 with  the same	arguments.  In simple cases this makes
	      it possible to perform the test for the tag and the matching  in
	      one go.  For example:

		     local expl	ret=1
		     _tags foo bar baz
		     while _tags; do
		       _requested foo expl 'description' \
			   compadd foobar foobaz && ret=0
		       ...
		       (( ret )) || break
		     done

	      If  the command is not compadd, it must nevertheless be prepared
	      to handle	the same options.

       _retrieve_cache cache_identifier
	      This function retrieves completion  information  from  the  file
	      given  by	 cache_identifier,  stored in a	directory specified by
	      the cache-path style which defaults to ~/.zcompcache.   The  re-
	      turn  status  is zero if retrieval was successful.  It will only
	      attempt retrieval	if the use-cache style is set, so you can call
	      this  function without worrying about whether the	user wanted to
	      use the caching layer.

	      See _store_cache below for more details.

       _sep_parts
	      This function is passed alternating arrays and separators	as ar-
	      guments.	The arrays specify completions for parts of strings to
	      be separated by the separators.  The arrays may be the names  of
	      array  parameters	or a quoted list of words in parentheses.  For
	      example, with the	array `hosts=(ftp news)' the call  `_sep_parts
	      '(foo  bar)' @ hosts' will complete the string  `f' to `foo' and
	      the string `b@n' to `bar@news'.

	      This function accepts the	 compadd  options  `-V',  `-J',	 `-1',
	      `-2',  `-n',  `-X',  `-M',  `-P',	`-S', `-r', `-R', and `-q' and
	      passes them on to	the compadd builtin used to add	the matches.

       _sequence [ -s sep ] [ -n max ] [ -d ] function [ - ] ...
	      This function is a wrapper to  other  functions  for  completing
	      items in a separated list. The same function is used to complete
	      each item	in the list. The separator is specified	 with  the  -s
	      option.  If  -s is omitted it will use `,'. Duplicate values are
	      not matched unless -d is specified. If there is a	fixed or maxi-
	      mum  number of items in the list,	this can be specified with the
	      -n option.

	      Common compadd options are passed	on to the function. It is pos-
	      sible to use compadd directly with _sequence, though _values may
	      be more appropriate in this situation.

       _setup tag [ group ]
	      This function sets up the	special	parameters used	by the comple-
	      tion  system  appropriately for the tag given as the first argu-
	      ment.    It   uses   the	 styles	  list-colors,	  list-packed,
	      list-rows-first, last-prompt, accept-exact, menu and force-list.

	      The  optional  group supplies the	name of	the group in which the
	      matches will be placed.  If it is	not given, the tag is used  as
	      the group	name.

	      This  function  is  called  automatically	 from _description and
	      hence is not normally called explicitly.

       _store_cache cache_identifier param ...
	      This function, together with _retrieve_cache and _cache_invalid,
	      implements  a  caching layer which can be	used in	any completion
	      function.	 Data obtained by costly operations are	stored in  pa-
	      rameters;	 this  function	then dumps the values of those parame-
	      ters to a	file.  The data	can then  be  retrieved	 quickly  from
	      that  file  via  _retrieve_cache,	even in	different instances of
	      the shell.

	      The cache_identifier specifies the file which the	data should be
	      dumped  to.   The	file is	stored in a directory specified	by the
	      cache-path style which defaults to ~/.zcompcache.	 The remaining
	      params arguments are the parameters to dump to the file.

	      The  return status is zero if storage was	successful.  The func-
	      tion will	only attempt storage if	the use-cache style is set, so
	      you  can	call  this function without worrying about whether the
	      user wanted to use the caching layer.

	      The completion function may avoid	calling	 _retrieve_cache  when
	      it  already  has	the  completion	 data available	as parameters.
	      However, in that case it should  call  _cache_invalid  to	 check
	      whether  the  data  in the parameters and	in the cache are still
	      valid.

	      See the _perl_modules completion function	for a  simple  example
	      of the usage of the caching layer.

       _tags [ [ -C name ] tag ... ]
	      If  called  with	arguments,  these are taken to be the names of
	      tags valid for completions in the	current	context.   These  tags
	      are stored internally and	sorted by using	the tag-order style.

	      Next, _tags is called repeatedly without arguments from the same
	      completion function.  This successively selects the first,  sec-
	      ond,  etc. set of	tags requested by the user.  The return	status
	      is zero if at least one of the tags is  requested	 and  non-zero
	      otherwise.  To test if a particular tag is to be tried, the _re-
	      quested function should be called	(see above).

	      If `-C name' is given, name is temporarily stored	in  the	 argu-
	      ment  field (the fifth) of the context in	the curcontext parame-
	      ter during the call to _tags; the	field  is  restored  on	 exit.
	      This  allows _tags to use	a more specific	context	without	having
	      to change	and reset the curcontext parameter (which has the same
	      effect).

       _tilde_files
	      Like  _files,  but resolve leading tildes	according to the rules
	      of filename expansion, so	the suggested completions don't	 start
	      with a `~' even if the filename on the command-line does.

       _values [ -O name ] [ -s	sep ] [	-S sep ] [ -wC ] desc spec ...
	      This  is	used to	complete arbitrary keywords (values) and their
	      arguments, or lists of such combinations.

	      If the first argument is the option `-O name', it	will  be  used
	      in  the same way as by the _arguments function.  In other	words,
	      the elements of the name array will be passed  to	 compadd  when
	      executing	an action.

	      If the first argument (or	the first argument after `-O name') is
	      `-s', the	next argument is used as the character that  separates
	      multiple	values.	  This	character is automatically added after
	      each value in an auto-removable fashion (see below); all	values
	      completed	by `_values -s'	appear in the same word	on the command
	      line, unlike completion using _arguments.	 If this option	is not
	      present, only a single value will	be completed per word.

	      Normally,	 _values  will	only use the current word to determine
	      which values are already present on the command line  and	 hence
	      are not to be completed again.  If the -w	option is given, other
	      arguments	are examined as	well.

	      The first	non-option argument, desc, is  used  as	 a  string  to
	      print as a description before listing the	values.

	      All other	arguments describe the possible	values and their argu-
	      ments in the same	format used for	the description	of options  by
	      the  _arguments  function	(see above).  The only differences are
	      that no minus or plus sign is required at	the beginning,	values
	      can  have	 only  one argument, and the forms of action beginning
	      with an equal sign are not supported.

	      The character separating a value from its	argument  can  be  set
	      using  the  option -S (like -s, followed by the character	to use
	      as the separator in the next argument).  By default  the	equals
	      sign will	be used	as the separator between values	and arguments.

	      Example:

		     _values -s	, 'description'	\
			     '*foo[bar]' \
			     '(two)*one[number]:first count:' \
			     'two[another number]::second count:(1 2 3)'

	      This  describes  three possible values: `foo', `one', and	`two'.
	      The first	is described as	`bar', takes no	argument and  may  ap-
	      pear  more  than once.  The second is described as `number', may
	      appear more than once, and  takes	 one  mandatory	 argument  de-
	      scribed as `first	count';	no action is specified,	so it will not
	      be completed.  The `(two)' at the	beginning  says	 that  if  the
	      value  `one'  is	on the line, the value `two' will no longer be
	      considered a  possible  completion.   Finally,  the  last	 value
	      (`two')  is  described as	`another number' and takes an optional
	      argument described as `second count' for which  the  completions
	      (to  appear  after  an  `=') are `1', `2', and `3'.  The _values
	      function will complete lists of these values separated  by  com-
	      mas.

	      Like  _arguments,	this function temporarily adds another context
	      name component to	the arguments element (the fifth) of the  cur-
	      rent context while executing the action.	Here this name is just
	      the name of the value for	which the argument is completed.

	      The style	verbose	is used	to decide if the descriptions for  the
	      values (but not those for	the arguments) should be printed.

	      The  associative	array  val_args	 is  used to report values and
	      their arguments; this works similarly to the  opt_args  associa-
	      tive array used by _arguments.  Hence the	function calling _val-
	      ues should declare  the  local  parameters  state,  state_descr,
	      line, context and	val_args:

		     local context state state_descr line
		     typeset -A	val_args

	      when using an action of the form `->string'.  With this function
	      the context parameter will be set	to the name of the value whose
	      argument	is  to be completed.  Note that	for _values, the state
	      and state_descr are scalars rather than arrays.  Only  a	single
	      matching state is	returned.

	      Note  also  that _values normally	adds the character used	as the
	      separator	between	values as an auto-removable suffix (similar to
	      a	 `/'  after a directory).  However, this is not	possible for a
	      `->string' action	as the matches for the argument	are  generated
	      by  the calling function.	 To get	the usual behaviour, the call-
	      ing function can add the separator x as a	suffix by passing  the
	      options `-qS x' either directly or indirectly to compadd.

	      The option -C is treated in the same way as it is	by _arguments.
	      In that case the parameter curcontext should be made  local  in-
	      stead of context (as described above).

       _wanted [ -x ] [	-C name	]  [ -12VJ ] tag name descr command [ arg ...]
	      In  many	contexts,  completion can only generate	one particular
	      set of matches, usually corresponding to a single	tag.  However,
	      it  is  still  necessary	to  decide  whether  the user requires
	      matches of this type.  This function is useful in	such a case.

	      The arguments to _wanted are the same as	those  to  _requested,
	      i.e.  arguments  to be passed to _description.  However, in this
	      case the command is not optional;	 all the processing  of	 tags,
	      including	the loop over both tags	and tag	labels and the genera-
	      tion of matches, is carried out automatically by _wanted.

	      Hence to offer only one tag and immediately add the  correspond-
	      ing matches with the given description:

		     local expl
		     _wanted tag expl 'description' \
			 compadd matches...

	      Note that, as for	_requested, the	command	must be	able to	accept
	      options to be passed down	to compadd.

	      Like _tags this function supports	the -C option to give  a  dif-
	      ferent  name  for	the argument context field.  The -x option has
	      the same meaning as for _description.

       _widgets	[ -g pattern ]
	      This function completes names of zle widgets  (see  the  section
	      `Widgets'	 in  zshzle(1)).   The pattern,	if present, is matched
	      against values of	the $widgets special parameter,	documented  in
	      the section `The zsh/zleparameter	Module'	in zshmodules(1).

COMPLETION SYSTEM VARIABLES
       There  are  some	 standard variables, initialised by the	_main_complete
       function	and then used from other functions.

       The standard variables are:

       _comp_caller_options
	      The completion system uses setopt	to set a  number  of  options.
	      This allows functions to be written without concern for compati-
	      bility with every	possible combination of	user options. However,
	      sometimes	 completion needs to know what the user's option pref-
	      erences are. These are saved in the  _comp_caller_options	 asso-
	      ciative array. Option names, spelled in lowercase	without	under-
	      scores, are mapped to one	or  other  of  the  strings  `on'  and
	      `off'.

	      _comp_priv_prefix
		     Completion	  functions   such   as	  _sudo	 can  set  the
		     _comp_priv_prefix array to	a command prefix that may then
		     be	 used  by  _call_program  to match the privileges when
		     calling programs to generate matches.

	      Two more features	are offered by	the  _main_complete  function.
	      The  arrays  compprefuncs	and comppostfuncs may contain names of
	      functions	that are to be called immediately before or after com-
	      pletion has been tried.  A function will only be called once un-
	      less it explicitly reinserts itself into the array.

COMPLETION DIRECTORIES
       In the source distribution, the files are contained in  various	subdi-
       rectories of the	Completion directory.  They may	have been installed in
       the same	structure, or into one single function directory.  The follow-
       ing  is	a  description	of  the	 files found in	the original directory
       structure.  If you wish to alter	an installed file, you	will  need  to
       copy  it	to some	directory which	appears	earlier	in your	fpath than the
       standard	directory where	it appears.

       Base   The core functions and special completion	widgets	 automatically
	      bound  to	 keys.	 You will certainly need most of these,	though
	      will probably not	need to	alter them.  Many of these  are	 docu-
	      mented above.

       Zsh    Functions	for completing arguments of shell builtin commands and
	      utility functions	for this.  Some	of  these  are	also  used  by
	      functions	from the Unix directory.

       Unix   Functions	 for  completing  arguments  of	 external commands and
	      suites of	commands.  They	may need modifying  for	 your  system,
	      although in many cases some attempt is made to decide which ver-
	      sion of a	command	is present.  For example, completion  for  the
	      mount  command  tries  to	determine the system it	is running on,
	      while completion for many	other utilities	try to decide  whether
	      the  GNU version of the command is in use, and hence whether the
	      --help option is supported.

       X, AIX, BSD, ...
	      Completion and utility function for commands available  only  on
	      some  systems.   These  are not arranged hierarchically, so, for
	      example, both the	Linux and Debian directories, as well as the X
	      directory, may be	useful on your system.

zsh 5.8			       February	14, 2020		 ZSHCOMPSYS(1)

NAME | DESCRIPTION | INITIALIZATION | COMPLETION SYSTEM CONFIGURATION | CONTROL FUNCTIONS | BINDABLE COMMANDS | UTILITY FUNCTIONS | COMPLETION SYSTEM VARIABLES | COMPLETION DIRECTORIES

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=zshcompsys&sektion=1&manpath=FreeBSD+12.1-RELEASE+and+Ports>

home | help