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TANGLE(1)                                                            TANGLE(1)

       tangle - translate WEB to Pascal

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

       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 con-

       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.

       This  version of tangle understands the following options.  Note that some of these options may render the out-
       put 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 settings of the --lowercase, --mixedcase,
              --uppercase, and --underline 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 underlines and convert all identifiers to upper-
              case 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.

       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 for nroff: The Program (Volume B of Computers and Typesetting), Addison-Wesley, 1986, ISBN

       Donald E. Knuth, Metafont: The Program (Volume D of Computers  and  Typesetting),  Addison-Wesley,  1986,  ISBN

       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 sub-
       scription request to 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 Stan-
       ford by Howard Trickey, and at Cornell by Pavel Curtis.

Web2C 7.5.6                     20 October 2002                      TANGLE(1)