scripts: check-variable-fonts.sh: convert to Python

This script handle errors when trying to build translations
with make pdfdocs.

As part of our cleanup work to remove hacks from docs Makefile,
convert this to python, preparing it to be part of a library
to be called by sphinx-build-wrapper.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <d438fb01d2c00e2c2b4ac16f999d9a8ce848251b.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

1 files changed, 0 insertions, 115 deletions

diff --git a/scripts/check-variable-fonts.sh b/scripts/check-variable-fonts.sh
deleted file mode 100755
index ce63f0acea5f..000000000000
--- a/scripts/check-variable-fonts.sh
+++ /dev/null
@@ -1,115 +0,0 @@
-#!/bin/sh
-# SPDX-License-Identifier: GPL-2.0-only
-# Copyright (C) Akira Yokosawa, 2024
-#
-# For "make pdfdocs", reports of build errors of translations.pdf started
-# arriving early 2024 [1, 2].  It turned out that Fedora and openSUSE
-# tumbleweed have started deploying variable-font [3] format of "Noto CJK"
-# fonts [4, 5].  For PDF, a LaTeX package named xeCJK is used for CJK
-# (Chinese, Japanese, Korean) pages.  xeCJK requires XeLaTeX/XeTeX, which
-# does not (and likely never will) understand variable fonts for historical
-# reasons.
-#
-# The build error happens even when both of variable- and non-variable-format
-# fonts are found on the build system.  To make matters worse, Fedora enlists
-# variable "Noto CJK" fonts in the requirements of langpacks-ja, -ko, -zh_CN,
-# -zh_TW, etc.  Hence developers who have interest in CJK pages are more
-# likely to encounter the build errors.
-#
-# This script is invoked from the error path of "make pdfdocs" and emits
-# suggestions if variable-font files of "Noto CJK" fonts are in the list of
-# fonts accessible from XeTeX.
-#
-# References:
-# [1]: https://lore.kernel.org/r/8734tqsrt7.fsf@meer.lwn.net/
-# [2]: https://lore.kernel.org/r/1708585803.600323099@f111.i.mail.ru/
-# [3]: https://en.wikipedia.org/wiki/Variable_font
-# [4]: https://fedoraproject.org/wiki/Changes/Noto_CJK_Variable_Fonts
-# [5]: https://build.opensuse.org/request/show/1157217
-#
-#===========================================================================
-# Workarounds for building translations.pdf
-#===========================================================================
-#
-# * Denylist "variable font" Noto CJK fonts.
-#   - Create $HOME/deny-vf/fontconfig/fonts.conf from template below, with
-#     tweaks if necessary.  Remove leading "# ".
-#   - Path of fontconfig/fonts.conf can be overridden by setting an env
-#     variable FONTS_CONF_DENY_VF.
-#
-#     * Template:
-# -----------------------------------------------------------------
-# <?xml version="1.0"?>
-# <!DOCTYPE fontconfig SYSTEM "urn:fontconfig:fonts.dtd">
-# <fontconfig>
-# <!--
-#   Ignore variable-font glob (not to break xetex)
-# -->
-#     <selectfont>
-#         <rejectfont>
-#             <!--
-#                 for Fedora
-#             -->
-#             <glob>/usr/share/fonts/google-noto-*-cjk-vf-fonts</glob>
-#             <!--
-#                 for openSUSE tumbleweed
-#             -->
-#             <glob>/usr/share/fonts/truetype/Noto*CJK*-VF.otf</glob>
-#         </rejectfont>
-#     </selectfont>
-# </fontconfig>
-# -----------------------------------------------------------------
-#
-#     The denylisting is activated for "make pdfdocs".
-#
-# * For skipping CJK pages in PDF
-#   - Uninstall texlive-xecjk.
-#     Denylisting is not needed in this case.
-#
-# * For printing CJK pages in PDF
-#   - Need non-variable "Noto CJK" fonts.
-#     * Fedora
-#       - google-noto-sans-cjk-fonts
-#       - google-noto-serif-cjk-fonts
-#     * openSUSE tumbleweed
-#       - Non-variable "Noto CJK" fonts are not available as distro packages
-#         as of April, 2024.  Fetch a set of font files from upstream Noto
-#         CJK Font released at:
-#           https://github.com/notofonts/noto-cjk/tree/main/Sans#super-otc
-#         and at:
-#           https://github.com/notofonts/noto-cjk/tree/main/Serif#super-otc
-#         , then uncompress and deploy them.
-#       - Remember to update fontconfig cache by running fc-cache.
-#
-# !!! Caution !!!
-#     Uninstalling "variable font" packages can be dangerous.
-#     They might be depended upon by other packages important for your work.
-#     Denylisting should be less invasive, as it is effective only while
-#     XeLaTeX runs in "make pdfdocs".
-
-# Default per-user fontconfig path (overridden by env variable)
-: ${FONTS_CONF_DENY_VF:=$HOME/deny-vf}
-
-export XDG_CONFIG_HOME=${FONTS_CONF_DENY_VF}
-
-notocjkvffonts=`fc-list : file family variable | \
-		grep 'variable=True' | \
-		grep -E -e 'Noto (Sans|Sans Mono|Serif) CJK' | \
-		sed -e 's/^/    /' -e 's/: Noto S.*$//' | sort | uniq`
-
-if [ "x$notocjkvffonts" != "x" ] ; then
-	echo '============================================================================='
-	echo 'XeTeX is confused by "variable font" files listed below:'
-	echo "$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.'
-	echo
-	echo 'For more info on denylisting, other options, and variable font, see header'
-	echo 'comments of scripts/check-variable-fonts.sh.'
-	echo '============================================================================='
-fi
-
-# As this script is invoked from Makefile's error path, always error exit
-# regardless of whether any variable font is discovered or not.
-exit 1