1TANGLE(1)                   General Commands Manual                  TANGLE(1)
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NAME

6       tangle - translate WEB to Pascal
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SYNOPSIS

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

12       This  manual page is not meant to be exhaustive.  The complete documen‐
13       tation for this version of TeX can be found in the info file or  manual
14       Web2C: A TeX implementation.
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16       The tangle program converts a Web source document into a Pascal program
17       that may be compiled in the usual way with the on-line Pascal  compiler
18       (e.g.,  pc(1)).   The output file is packed into lines of 72 characters
19       or less, with the only concession to readability being the  termination
20       of lines at semicolons when this can be done conveniently.
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22       The Web language allows you to prepare a single document containing all
23       the information that is needed both to produce a compilable Pascal pro‐
24       gram and to produce a well-formatted document describing the program in
25       as much detail as the writer may desire.   The  user  of  Web  must  be
26       familiar with both TeX and Pascal.  Web also provides a relatively sim‐
27       ple, although adequate, macro facility that permits a Pascal program to
28       be written in small easily-understood modules.
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30       The  command line should have either one or two names on it.  The first
31       is taken as the Web file (and .web is added if there is no  extension).
32       If  there  is  another  name,  it is a change file (and .ch is added if
33       there is no extension).  The change file overrides  parts  of  the  Web
34       file, as described in the Web system documentation.
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36       The  output files are a Pascal file and a string pool file, whose names
37       are formed by adding .p and .pool respectively to the root of  the  Web
38       file name.
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OPTIONS

41       This  version  of  tangle understands the following options.  Note that
42       some of these options may render the output unsuitable  for  processing
43       by a Pascal compiler.
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45       --help Print help message and exit.
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47       --length number
48              Compare  only  the  first  number characters of identifiers when
49              checking for collisions.  The default is 32, the original tangle
50              used 7.
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52       --loose
53              When checking for collisions between identifiers, honor the set‐
54              tings of the --lowercase, --mixedcase, --uppercase, and --under‐
55              line options. This is the default.
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57       --lowercase
58              Convert all identifiers to lowercase.
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60       --mixedcase
61              Retain the case of identifiers.  This is the default.
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63       --strict
64              When  checking  for collisions between identifiers, strip under‐
65              lines and convert all identifiers to uppercase first.
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67       --underline
68              Retain underlines (also known as underscores) in identifiers.
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70       --uppercase
71              Convert all identifiers to uppercase.  This is the behaviour  of
72              the original tangle.
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74       --version
75              Print version information and exit.
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ENVIRONMENT

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

83       pc(1), pxp(1) (for formatting tangle output when debugging), tex(1).
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85       Donald E. Knuth, The Web System of Structured Documentation.
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87       Donald  E.  Knuth,  Literate  Programming, Computer Journal 27, 97-111,
88       1984.
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90       Wayne Sewell, Weaving a Program,  Van  Nostrand  Reinhold,  1989,  ISBN
91       0-442-31946-0.
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93       Donald  E.  Knuth, TeX: The Program (Volume B of Computers and Typeset‐
94       ting), Addison-Wesley, 1986, ISBN 0-201-13437-3.
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96       Donald E. Knuth, Metafont: The Program (Volume D of Computers and Type‐
97       setting), Addison-Wesley, 1986, ISBN 0-201-13438-1.
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99       These last two are by far the largest extant examples of Web programs.
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101       There is an active Internet electronic mail discussion list on the sub‐
102       ject of literate programming; send a subscription request  to  litprog-
103       request@shsu.edu to join.
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AUTHORS

106       Web  was designed by Donald E. Knuth, based on an earlier system called
107       DOC (implemented by Ignacio Zabala).  The tangle and weave programs are
108       themselves  written in Web. The system was originally ported to Unix at
109       Stanford by Howard Trickey, and at Cornell by Pavel Curtis.
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113Web2C 2019                       16 June 2015                        TANGLE(1)
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