xenial (1) otangle.1.gz

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 for nroff: 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.