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docs: scripts/check-variable-fonts.sh: Improve commands for detection

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As mentioned in "Assumption:", current grep expression can't catch
font files whose names are changed from upstream "Noto CJK fonts".

To avoid false negatives, use command of the form:

    fc-list : file family variable

, where ":" works as a wildcard pattern.

Variable fonts can be detected by filtering the output with
"variable=True" and "Noto CJK" font-family variants.

Signed-off-by: Akira Yokosawa <akiyks@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/c62ba2e6-c124-4e91-8011-cb1da408a3c5@gmail.com
This commit is contained in:
Akira Yokosawa 2024-04-27 17:24:11 +09:00 committed by Jonathan Corbet
parent af3e4a5ab9
commit 5384258f4e
1 changed files with 6 additions and 8 deletions
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14
scripts/check-variable-fonts.sh
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@ -20,10 +20,6 @@
# suggestions if variable-font files of "Noto CJK" fonts are in the list of
# fonts accessible from XeTeX.
#
# Assumption:
# File names are not modified from those of upstream Noto CJK fonts:
# https://github.com/notofonts/noto-cjk/
#
# References:
# [1]: https://lore.kernel.org/r/8734tqsrt7.fsf@meer.lwn.net/
# [2]: https://lore.kernel.org/r/1708585803.600323099@f111.i.mail.ru/
@ -96,13 +92,15 @@
export XDG_CONFIG_HOME=${FONTS_CONF_DENY_VF}
vffonts=`fc-list -b | grep -iE 'file: .*noto.*cjk.*-vf' | \
sed -e 's/\tfile:/ file:/' -e 's/(s)$//' | sort | uniq`
notocjkvffonts=`fc-list : file family variable | \
grep 'variable=True' | \
grep -E -e 'Noto (Sans|Sans Mono|Serif) CJK' | \
sed -e 's/^/ /' -e 's/: Noto S.*$//' | sort | uniq`
if [ "x$vffonts" != "x" ] ; then
if [ "x$notocjkvffonts" != "x" ] ; then
echo '============================================================================='
echo 'XeTeX is confused by "variable font" files listed below:'
echo "$vffonts"
echo "$notocjkvffonts"
echo
echo 'For CJK pages in PDF, they need to be hidden from XeTeX by denylisting.'
echo 'Or, CJK pages can be skipped by uninstalling texlive-xecjk.'