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tangle(1)


NAME

   tangle - translate WEB to Pascal

SYNOPSIS

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

DESCRIPTION

   This  manual  page  is  not  meant  to  be  exhaustive.   The  complete
   documentation 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
   program 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
   familiar  with  both  TeX  and  Pascal.  Web also provides a relatively
   simple, 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.

OPTIONS

   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.

   --loose
          When  checking  for  collisions  between  identifiers, honor the
          settings  of  the  --lowercase,  --mixedcase,  --uppercase,  and
          --underline options. This is the default.

   --lowercase
          Convert all identifiers to lowercase.

   --mixedcase
          Retain the case of identifiers.  This is the default.

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

   --underline
          Retain underlines (also known as underscores) in identifiers.

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

   --version
          Print version information and exit.

ENVIRONMENT

   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.

SEE ALSO

   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,
   1984.

   Wayne Sewell, Weaving a Program,  Van  Nostrand  Reinhold,  1989,  ISBN
   0-442-31946-0.

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

   Donald E. Knuth, Metafont: The  Program  (Volume  D  of  Computers  and
   Typesetting), 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
   subject  of  literate  programming;  send  a  subscription  request  to
   litprog-request@shsu.edu to join.

AUTHORS

   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.



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