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Squashed 'third_party/git/' content from commit cb71568594

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git-subtree-dir: third_party/git
git-subtree-split: cb715685942260375e1eb8153b0768a376e4ece7
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Vincent Ambo 2020-01-11 23:36:56 +00:00
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TL;DR: Run update_unicode.sh after the publication of a new Unicode
standard and commit the resulting unicode-widths.h file.
The long version
================
The Git source code ships the file unicode-widths.h which contains
tables of zero and double width Unicode code points, respectively.
These tables are generated using update_unicode.sh in this directory.
update_unicode.sh itself uses a third-party tool, uniset, to query two
Unicode data files for the interesting code points.
On first run, update_unicode.sh clones uniset from Github and builds it.
This requires a current-ish version of autoconf (2.69 works per December
2016).
On each run, update_unicode.sh checks whether more recent Unicode data
files are available from the Unicode consortium, and rebuilds the header
unicode-widths.h with the new data. The new header can then be
committed.