[Gnu-arch-users] Is tagline an attractive nuisance for international users?

[Stephen J. Turnbull]

The tagline tag-snarfing algorithm is

1. Restrict the file to 1st 1K plus last 1K.
2. Find "^[[:blank:][:punct:]]*arch-tag:[[:blank:]]*(.*?)[^[:graph:]]*$"
   where *? is the shy repetition operator (subject to the 1024 byte
   boundary)
3. Grab the group, and smash any octet in it outside of [33,126] to '_'.
4. Return the result of 3.

Anybody using a "human-readable" algorithm for tag construction in a
language other than English is liable for lots of collisions.  For
example, in EUC or UTF-8 Japanese, the tag disappears (it gets scarfed
by the non-captured trailing [[:graph:]]* in the regexp) unless
there's some stray non-blank non-Japanese in the tag part.

I think nowadays everybody is using uuidgen or the like, but this
probably should be documented.

-- 
Institute of Policy and Planning Sciences     http://turnbull.sk.tsukuba.ac.jp
University of Tsukuba                    Tennodai 1-1-1 Tsukuba 305-8573 JAPAN
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