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docs: scripts/check-variable-fonts.sh: Improve commands for detection
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
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@ -20,10 +20,6 @@
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# suggestions if variable-font files of "Noto CJK" fonts are in the list of
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# fonts accessible from XeTeX.
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#
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# Assumption:
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# File names are not modified from those of upstream Noto CJK fonts:
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# https://github.com/notofonts/noto-cjk/
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#
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# References:
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# [1]: https://lore.kernel.org/r/8734tqsrt7.fsf@meer.lwn.net/
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# [2]: https://lore.kernel.org/r/1708585803.600323099@f111.i.mail.ru/
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@ -96,13 +92,15 @@
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export XDG_CONFIG_HOME=${FONTS_CONF_DENY_VF}
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vffonts=`fc-list -b | grep -iE 'file: .*noto.*cjk.*-vf' | \
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sed -e 's/\tfile:/ file:/' -e 's/(s)$//' | sort | uniq`
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notocjkvffonts=`fc-list : file family variable | \
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grep 'variable=True' | \
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grep -E -e 'Noto (Sans|Sans Mono|Serif) CJK' | \
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sed -e 's/^/ /' -e 's/: Noto S.*$//' | sort | uniq`
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if [ "x$vffonts" != "x" ] ; then
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if [ "x$notocjkvffonts" != "x" ] ; then
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echo '============================================================================='
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echo 'XeTeX is confused by "variable font" files listed below:'
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echo "$vffonts"
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echo "$notocjkvffonts"
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echo
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echo 'For CJK pages in PDF, they need to be hidden from XeTeX by denylisting.'
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echo 'Or, CJK pages can be skipped by uninstalling texlive-xecjk.'
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