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TANGLE(1)		    General Commands Manual		     TANGLE(1)

       tangle -	translate WEB to Pascal

       tangle [options]	webfile[.web] [changefile[.ch]]

       This  manual page is not	meant to be exhaustive.	 The complete documen-
       tation for this version of TeX can be found in the info file or	manual
       Web2C: A	TeX implementation.

       The tangle program converts a Web source	document into a	Pascal program
       that may	be compiled in the usual way with the on-line Pascal  compiler
       (e.g.,  pc(1)).	 The output file is packed into	lines of 72 characters
       or less,	with the only concession to readability	being the  termination
       of lines	at semicolons when this	can be done conveniently.

       The Web language	allows you to prepare a	single document	containing all
       the information that is needed both to produce a	compilable Pascal pro-
       gram and	to produce a well-formatted document describing	the program in
       as much detail as the writer may	desire.	 The user of Web must  be  fa-
       miliar  with  both TeX and Pascal.  Web also provides a relatively sim-
       ple, although adequate, macro facility that permits a Pascal program to
       be written in small easily-understood modules.

       The  command line should	have either one	or two names on	it.  The first
       is taken	as the Web file	(and .web is added if there is no  extension).
       If  there  is  another  name,  it is a change file (and .ch is added if
       there is	no extension).	The change file	overrides  parts  of  the  Web
       file, as	described in the Web system documentation.

       The  output files are a Pascal file and a string	pool file, whose names
       are formed by adding .p and .pool respectively to the root of  the  Web
       file name.

       This  version  of  tangle understands the following options.  Note that
       some of these options may render	the output unsuitable  for  processing
       by a Pascal compiler.

       --help Print help message and exit.

       --length	number
	      Compare  only  the  first	 number	characters of identifiers when
	      checking for collisions.	The default is 32, the original	tangle
	      used 7.

	      When checking for	collisions between identifiers,	honor the set-
	      tings of the --lowercase,	--mixedcase, --uppercase, and --under-
	      line options. This is the	default.

	      Convert all identifiers to lowercase.

	      Retain the case of identifiers.  This is the default.

	      When  checking  for collisions between identifiers, strip	under-
	      lines and	convert	all identifiers	to uppercase first.

	      Retain underlines	(also known as underscores) in identifiers.

	      Convert all identifiers to uppercase.  This is the behaviour  of
	      the original tangle.

	      Print version information	and exit.

       The  environment	 variable  WEBINPUTS  is  used to search for the input
       files, or the system default if WEBINPUTS is not	set.  See  tex(1)  for
       the details of the searching.

       pc(1), pxp(1) (for formatting tangle output when	debugging), tex(1).

       Donald E. Knuth,	The Web	System of Structured Documentation.

       Donald  E.  Knuth,  Literate  Programming, Computer Journal 27, 97-111,

       Wayne Sewell, Weaving a Program,	 Van  Nostrand	Reinhold,  1989,  ISBN

       Donald  E.  Knuth, TeX: The Program (Volume B of	Computers and Typeset-
       ting), Addison-Wesley, 1986, ISBN 0-201-13437-3.

       Donald E. Knuth,	Metafont: The Program (Volume D	of Computers and Type-
       setting), Addison-Wesley, 1986, ISBN 0-201-13438-1.

       These last two are by far the largest extant examples of	Web programs.

       There is	an active Internet electronic mail discussion list on the sub-
       ject of literate	programming; send a subscription request  to  litprog-	to join.

       Web  was	designed by Donald E. Knuth, based on an earlier system	called
       DOC (implemented	by Ignacio Zabala).  The tangle	and weave programs are
       themselves  written in Web. The system was originally ported to Unix at
       Stanford	by Howard Trickey, and at Cornell by Pavel Curtis.

Web2C 2021			 16 June 2015			     TANGLE(1)


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