tangle - translate WEB to Pascal
SYNOPSIS
tangle webfile[.web] [ changefile[.ch] ]
DESCRIPTION
This manual page is not meant to be exhaustive. The com
plete 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 all in lower case and packed into lines of 72
characters or less, with the only concession to readabil
ity 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 pro
duce 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 exten
sion). 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.
SEE ALSO
pc(1), pxp(1) (for formatting tangle output when debug
ging), tex(1).
Donald E. Knuth, The Web System of Structured Documenta
tion.
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
0-201-13437-3.
Donald E. Knuth, Metafont: The Program (Volume D of Com
puters 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 sub
scription 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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