161 lines
5.5 KiB
Bash
Executable File
161 lines
5.5 KiB
Bash
Executable File
#!/bin/sh
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set -e
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#
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# This script subsets our variable fonts,
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# converts them to woff2 files and puts them in the
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# fonts folder.
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#
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# We do have to update the font paths in the @font-face
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# definitions manually since we use a checksum to make
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#
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# We use fonttools to create a partial instance of the
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# variable font where we keep only our needed features.
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# See more at:
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# https://fonttools.readthedocs.io/en/latest/varLib/instancer.html
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#
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# fonttools requires python > 3.7. For up-to-date
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# instructions see https://github.com/fonttools/fonttools#installation
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#
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# Lot's of info was gathered from:
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# https://markoskon.com/creating-font-subsets/
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# https://barrd.dev/article/create-a-variable-font-subset-for-smaller-file-size/
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#
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ORIGINAL_FONTS="./originalMedia/fonts"
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TEMP_FOLDER="./.subset-fonts-temp"
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FONT_FOLDER="./src/assets/fonts"
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err_report() {
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echo "Error on line $(caller)" >&2
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}
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trap err_report ERR
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mkdir -p $TEMP_FOLDER
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# the latin subset that google uses on GoogleFonts
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# this is the same as the latin subset range that google uses on GoogleFonts
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# see for examle the unicode-range definition here:
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# https://fonts.googleapis.com/css2?family=Open+Sans
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UNICODE_LATIN_SUBSET="U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,\
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U+02C6,U+02DA,U+02DC,U+2000-206F,U+2074,U+20AC,\
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U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD"
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get_filename_without_type() {
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filename=$1
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dirname=$(dirname $filename)
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# Extract the file type using parameter expansion
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filetype=${filename##*.}
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basename=$(basename $filename .$filetype)
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echo $basename
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}
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# This function takes a font file and creates a subset of it using a specified set of unicode characters.
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instance_and_subset () {
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# Define default arguments for the subsetter.
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DEFAULT_SUBSETTER_ARGS="--layout-features=* --unicodes=${UNICODE_LATIN_SUBSET}"
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# Assign function arguments to variables with more descriptive names.
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INPUT_FONT_FILE=$1
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INSTANCER_ARGS=$2
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OUTPUT_FONT_BASENAME=$3
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OUTPUT_FOLDER=$FONT_FOLDER
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# If the output font basename is not provided, use the input font file's basename as the output font basename.
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if [ -z "$OUTPUT_FONT_BASENAME" ]; then
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INPUT_FONT_BASENAME=$(get_filename_without_type $INPUT_FONT_FILE)
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OUTPUT_FONT_BASENAME=$INPUT_FONT_BASENAME
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fi
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# Use the default subsetter arguments if no custom arguments are provided.
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SUBSETTER_ARGS="${4:-$DEFAULT_SUBSETTER_ARGS}"
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CHECKSUM=$(
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# Concatenate the contents of the input font file, the instancer arguments, and the subsetter arguments
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printf "%s%s" "$(cat $INPUT_FONT_FILE)" "$INSTANCER_ARGS" "$SUBSETTER_ARGS" |
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# Calculate the Blake2b checksum of the concatenated string
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b2sum |
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# Extract the checksum from the output of b2sum (it's the first field)
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awk '{print $1}'
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)
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# Limit the checksum to 8 characters.
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CHECKSUM=$(echo "${CHECKSUM:0:8}")
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# Construct the output font's filename
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OUTPUT_FONT_BASENAME="${OUTPUT_FONT_BASENAME}_${CHECKSUM}"
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OUTPUT_FONT_FILE="${OUTPUT_FOLDER}/${OUTPUT_FONT_BASENAME}.woff2"
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# Check if the output font file already exists
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if test -f $OUTPUT_FONT_FILE; then
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echo "${OUTPUT_FONT_FILE} exists"
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return 0
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fi
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FONT_INSTANCE="${TEMP_FOLDER}/${OUTPUT_FONT_BASENAME}.ttf"
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if [ -n "$INSTANCER_ARGS" ]; then
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# If the INSTANCER_ARGS variable is set, use fonttools to create a font instance
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fonttools varLib.instancer --output $FONT_INSTANCE $INPUT_FONT_FILE $INSTANCER_ARGS
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else
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# Otherwise, just copy the input font file to the font instance file
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cp $INPUT_FONT_FILE $FONT_INSTANCE
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fi
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# Use pyftsubset to create a subset of the font instance and save it to the output font file
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pyftsubset $FONT_INSTANCE --output-file=$OUTPUT_FONT_FILE --flavor=woff2 $SUBSETTER_ARGS
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echo "${OUTPUT_FONT_BASENAME} subsetted."
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}
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echo ""
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echo "###################################################"
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echo "# Install required libs"
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echo "###################################################"
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echo ""
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pip install fonttools brotli
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echo ""
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echo "###################################################"
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echo "# Create a partial instance of the variable font"
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echo "# where we keep only our needed features and then"
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echo "# subset fonts with latin unicode range and export"
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echo "# as woff2 file"
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echo "###################################################"
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echo ""
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mkdir -p $TEMP_FOLDER
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echo "\nOpen Sans"
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# we drop the wdth axis for all
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instance_and_subset "${ORIGINAL_FONTS}/OpenSans[wdth,wght].ttf" "wdth=drop wght=400:700" "OpenSans[wght]"
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# we restrict the wght range
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instance_and_subset "${ORIGINAL_FONTS}/OpenSans[wdth,wght].ttf" "wdth=drop wght=400" "OpenSans-Regular"
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instance_and_subset "${ORIGINAL_FONTS}/OpenSans[wdth,wght].ttf" "wdth=drop wght=700" "OpenSans-Bold"
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echo "\nOpen Sans Italic"
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# we drop the wdth axis for all
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instance_and_subset "${ORIGINAL_FONTS}/OpenSans-Italic[wdth,wght].ttf" "wdth=drop wght=400:700" "OpenSans-Italic[wght]"
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# we restrict the wght range
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instance_and_subset "${ORIGINAL_FONTS}/OpenSans-Italic[wdth,wght].ttf" "wdth=drop wght=400" "OpenSans-RegularItalic"
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instance_and_subset "${ORIGINAL_FONTS}/OpenSans-Italic[wdth,wght].ttf" "wdth=drop wght=700" "OpenSans-BoldItalic"
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echo "\nQuicksand"
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instance_and_subset "${ORIGINAL_FONTS}/Quicksand[wght].ttf" "wght=400:700"
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# we restrict the wght range
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instance_and_subset "${ORIGINAL_FONTS}/Quicksand[wght].ttf" "wght=400" "Quicksand-Regular"
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instance_and_subset "${ORIGINAL_FONTS}/Quicksand[wght].ttf" "wght=600" "Quicksand-SemiBold"
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instance_and_subset "${ORIGINAL_FONTS}/Quicksand[wght].ttf" "wght=700" "Quicksand-Bold"
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echo "\nSubsetting files complete"
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# remove temp folder
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rm -r $TEMP_FOLDER |