contrib/update-unicode/README

   1 TL;DR: Run update_unicode.sh after the publication of a new Unicode
   2 standard and commit the resulting unicode_widths.h file.
   3
   4 The long version
   5 ================
   6
   7 The Git source code ships the file unicode_widths.h which contains
   8 tables of zero and double width Unicode code points, respectively.
   9 These tables are generated using update_unicode.sh in this directory.
  10 update_unicode.sh itself uses a third-party tool, uniset, to query two
  11 Unicode data files for the interesting code points.
  12
  13 On first run, update_unicode.sh clones uniset from Github and builds it.
  14 This requires a current-ish version of autoconf (2.69 works per December
  15 2016).
  16
  17 On each run, update_unicode.sh checks whether more recent Unicode data
  18 files are available from the Unicode consortium, and rebuilds the header
  19 unicode_widths.h with the new data. The new header can then be
  20 committed.