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Because it's easier to maintain documentation, code, and other metainfo in one source file than in many files, there have evolved many methods for grepping source to lift and separate these kinds of info, in the process generating docs or fragments of source or what have you. This is known generally as snarfing, which comes from the verb “to snarf”, here meaning “to unceremoniously extract information from a somewhat unwilling source.”
This section documents the programs c2doc, h2doc,
doc-snarf, prep-Ptexi, make-twerp2texi-index and
twerp2texi, which are used for doc snarfing and .texi
maintenance. See Init Snarfing, on the other hand, for init
snarfing.