add texture generation scripts from https://github.com/zeuner/signs-font-generate

util/LICENSE

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+
+                   GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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+
+
+  This version of the GNU Lesser General Public License incorporates
+the terms and conditions of version 3 of the GNU General Public
+License, supplemented by the additional permissions listed below.
+
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+

util/README.md

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+# signs-font-generate
+
+This is a collection of helper shell scripts to create textures for
+international characters to be used with the
+[signs_lib](https://gitlab.com/VanessaE/signs_lib) Minetest mod.
+
+They currently expect the
+[Liberation Fonts](https://github.com/liberationfonts/liberation-fonts) to be
+installed at "/usr/share/fonts/truetype/liberation".
+
+ImageMagick is also required.
+
+## Basic usage
+
+sh create-signs-lib-overlay.sh <signs_lib_directory> <language-code>
+
+For example, this command will write textures for the non-ASCII characters
+of the French language to "/home/user/signs_lib":
+
+sh create-signs-lib-overlay.sh /home/user/signs_lib fr
+
+Currently, there is support for German (de), French (fr) and Polish (pl)
+non-ASCII characters.
+
+## Character alignment
+
+I chose the image processing parameters in order fairly match the alignment of
+the existing signs_lib textures. In order to get even better alignment at
+the expense of slightly smaller textures, it is possible to also replace
+existing ASCII character textures:
+
+sh write-ascii.sh <signs_lib_texture_directory>
+
+For example, with signs_lib residing at "/home/user/signs_lib":
+
+sh write-ascii.sh /home/user/signs_lib/textures

util/create-signs-lib-overlay.sh

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+mkdir -p "$1/textures"
+cat nonascii-$2|
+sh write-nonascii.sh "$1/textures"
+cat nonascii-$2|
+sed 's,.*,sh unicode-numbers.sh "&",'|
+sh|
+sed 's/.*/signs_lib.unicode_install(&)/'|
+sort > "$1/nonascii-$2.lua"

util/nonascii-de

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+ä
+ö
+ü
+ß
+Ä
+Ö
+Ü

util/nonascii-fr

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+à
+æ
+ç
+é
+è
+ê
+ô
+ù
+À
+Æ
+Ç
+É
+È
+Ê
+Ô
+Ù

util/nonascii-pl

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+ż
+ź
+ć
+ś
+ó
+ą
+ę
+ł
+Ż
+Ź
+Ć
+Ś
+Ó
+Ą
+Ę
+Ł

util/unicode-numbers.sh

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+(
+    echo -n "$1"|
+    xxd -ps|
+    sed 's/../echo $((0x&))\n/g'|
+    sh
+    echo -n "$1"|
+    iconv -f utf-8 -t utf-32|
+    xxd -ps|
+    sed s/fffe0000//|
+    sed 's/../&\n/g'|
+    grep .|
+    tac|
+    tr "
+" " "|
+    sed 's/ //g'|
+    sed s/^00//|
+    sed s/^00//|
+    sed 's/.*/"&"/'
+)|
+tr "
+" ","|
+sed 's/.*/{&}\n/'

util/write-ascii.sh

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+(
+    seq $((0x$(echo -n a | xxd -ps))) $((0x$(echo -n z | xxd -ps)))
+    seq $((0x$(echo -n A | xxd -ps))) $((0x$(echo -n Z | xxd -ps)))
+    seq $((0x$(echo -n 0 | xxd -ps))) $((0x$(echo -n 9 | xxd -ps)))
+    echo -n " #$%&'()*+,-./:;<=>?@[]^_{|}~!\"\\\`"|
+    xxd -ps|
+    sed 's/../&\n/g'|
+    grep .|
+    sed 's/.*/echo $((0x&))/'|
+    sh
+)|
+sed 's<^<printf "%.02x\\n" <'|
+sh|
+sed 's<.*</bin/echo -n -e "convert\\\
+ -debug annotate\\\
+ -size 180x180 xc:white\\\
+ -font /usr/share/fonts/truetype/liberation/LiberationSans-Bold.ttf\\\
+ -gravity northwest\\\
+ -pointsize 15\\\
+ +antialias\\\
+ -annotate 0 '"'"'"\
+/bin/echo -n -e "\\x&"|\
+sed '"'"'s>'"'"'"'"'"'"'"'"'>\&"\&"\&>'"'"'\
+/bin/echo -n -e "'"'"'\\\
+ "'"$1"'/im-out.png" 2> "'"$1"'/im.err"\
+grep '"'"' width: '"'"' "'"$1"'/im.err"|\
+sed '"'"'s/.* width: //'"'"'|\
+sed '"'"'s/;.*//'"'"'|\
+sed '"'"'s|^|printf \\\"%.0f\\\" |'"'"'|\
+sh|\
+sed '"'"'s%.*%convert\\\
+ '"$1"'/im-out.png\\\
+ -negate\\\
+ -monochrome\\\
+ -transparent white\\\
+ -crop \\$((\&+1))x15+0+2\\\
+ +repage\\\
+ '"$1"'/signs_lib_font_15px_&.png%'"'"'|\
+sh -e -x\
+convert\\\
+ -debug annotate\\\
+ -size 180x180 xc:white\\\
+ -font /usr/share/fonts/truetype/liberation/LiberationSans-Bold.ttf\\\
+ -gravity northwest\\\
+ -pointsize 31\\\
+ +antialias\\\
+ -annotate 0 '"'"'"\
+/bin/echo -n -e "\\x&"|\
+sed '"'"'s>'"'"'"'"'"'"'"'"'>\&"\&"\&>'"'"'\
+/bin/echo -n -e "'"'"'\\\
+ "'"$1"'/im-out.png" 2> "'"$1"'/im.err"\
+grep '"'"' width: '"'"' "'"$1"'/im.err"|\
+sed '"'"'s/.* width: //'"'"'|\
+sed '"'"'s/;.*//'"'"'|\
+sed '"'"'s|^|printf \\\"%.0f\\\" |'"'"'|\
+sh|\
+sed '"'"'s%.*%convert\\\
+ '"$1"'/im-out.png\\\
+ -negate\\\
+ -monochrome\\\
+ -transparent white\\\
+ -crop \\$((\&+1))x31+0+4\\\
+ +repage\\\
+ '"$1"'/signs_lib_font_31px_&.png%'"'"'|\
+sh -e -x\
+"<'|
+sh|
+sh -e -x
+rm -f "$1/im-out.png"
+rm -f "$1/im.err"

util/write-nonascii.sh

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+sed 's,.*,sh unicode-numbers.sh "&",'|
+sh|
+sed 's/'"'"'/&"&"&/g'|
+sed 's/%/&&/g'|
+sed "s,.*,printf '&\\\n',"|
+sed "s/\([0-9]*\),/'\nprintf '\\\x%.02x' \1\nprintf '/g"|
+sh|
+sed 's<{\(.*\)"\(.*\)"}</bin/echo -e "convert\\\
+ -debug annotate\\\
+ -size 180x180 xc:white\\\
+ -font /usr/share/fonts/truetype/liberation/LiberationSans-Bold.ttf\\\
+ -gravity northwest\\\
+ -pointsize 15\\\
+ +antialias\\\
+ -annotate 0 '"'"'\1'"'"'\\\
+ "'"$1"'/im-out.png" 2> "'"$1"'/im.err"\
+grep '"'"' width: '"'"' "'"$1"'/im.err"|\
+sed '"'"'s/.* width: //'"'"'|\
+sed '"'"'s/;.*//'"'"'|\
+sed '"'"'s|^|printf \\\"%.0f\\\" |'"'"'|\
+sh|\
+sed '"'"'s%.*%convert\\\
+ '"$1"'/im-out.png\\\
+ -negate\\\
+ -monochrome\\\
+ -transparent white\\\
+ -crop \\$((\&+1))x15+0+2\\\
+ +repage\\\
+ '"$1"'/signs_lib_font_15px_\2.png%'"'"'|\
+sh -e -x\
+convert\\\
+ -debug annotate\\\
+ -size 180x180 xc:white\\\
+ -font /usr/share/fonts/truetype/liberation/LiberationSans-Bold.ttf\\\
+ -gravity northwest\\\
+ -pointsize 31\\\
+ +antialias\\\
+ -annotate 0 '"'"'\1'"'"'\\\
+ "'"$1"'/im-out.png" 2> "'"$1"'/im.err"\
+grep '"'"' width: '"'"' "'"$1"'/im.err"|\
+sed '"'"'s/.* width: //'"'"'|\
+sed '"'"'s/;.*//'"'"'|\
+sed '"'"'s|^|printf \\\"%.0f\\\" |'"'"'|\
+sh|\
+sed '"'"'s%.*%convert\\\
+ '"$1"'/im-out.png\\\
+ -negate\\\
+ -monochrome\\\
+ -transparent white\\\
+ -crop \\$((\&+1))x31+0+4\\\
+ +repage\\\
+ '"$1"'/signs_lib_font_31px_\2.png%'"'"'|\
+sh -e -x"<'|
+sh|
+sh -e -x
+rm -f "$1/im-out.png"
+rm -f "$1/im.err"