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compress.sh
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compress.sh
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#!/usr/bin/env bash
set -eux
ASSET_DIR=${ASSET_DIR:-.}
MIN_RELDIFF=2 # percent (approx)
MIN_ABSDIFF=20 # bytes
COMPRESSION=${COMPRESSION:-HIGH}
if [ "$COMPRESSION" == "HIGH" ]; then
GZIP_CMD="zopfli --i50 --gzip -c --"
BROTLI_CMD="brotli --best --keep --stdout --"
ZSTD_CMD="zstd -19 -k -c --"
ZSTD_DICT_CMD="zstd -19 -k -c -D /dict/zstd --"
PNG_OPTIPNG_CMD="optipng -o5"
PNG_ZOPFLIPNG_CMD="zopflipng --iterations=50 --filters=0me --lossy_transparent --lossy_8bit"
PNG_WEBP_CMD="cwebp -m 6 -pre 4 -sharp_yuv -q 90"
PNG_AVIF_CMD="avifenc -s 0"
PNG_HEIF_CMD="heif-enc -q 45"
PNG_JXL_CMD="cjxl -d 1 -s 9"
JPG_WEBP_CMD="cwebp -m 6 -q 85"
JPG_AVIF_CMD="avifenc -s 0"
JPG_HEIF_CMD="heif-enc -q 40"
JPG_JXL_CMD="cjxl -q 85 -s 9"
GIF_CMD="gifsicle -O3"
GIF_WEBP_CMD="gif2webp -m 6 -mixed -q 90"
GIF_AVIF_CMD="convert -quality 90"
GIF_APNG_CMD="gif2apng"
GIF_OPTIPNG_CMD="optipng -o5"
GIF_ZOPFLIPNG_CMD="zopflipng --iterations=50 --filters=0me --lossy_transparent --lossy_8bit"
GIF_JPEG_CMD="cjpeg -quality 90 -optimize -progressive -sample 1x1"
GIF_JXL_CMD="cjxl -d 1 -s 9"
WEBP_AVIF_CMD="avifenc -s 0"
WEBP_OPTIPNG_CMD="optipng -o5"
WEBP_ZOPFLIPNG_CMD="zopflipng --iterations=50 --filters=0me --lossy_transparent --lossy_8bit"
WEBP_JXL_CMD="cjxl -d 1 -s 9"
APNG_WEBP_CMD="convert -quality 90"
SVG_CMD="svgo --multipass"
else
GZIP_CMD="zopfli --i1 --gzip -c --"
BROTLI_CMD="brotli -0 --keep --stdout --"
ZSTD_CMD="zstd -1 -k -c --"
ZSTD_DICT_CMD="zstd -1 -k -c -D /dict/zstd --"
PNG_OPTIPNG_CMD="optipng -o0"
PNG_ZOPFLIPNG_CMD="zopflipng -q --lossy_transparent --lossy_8bit"
PNG_WEBP_CMD="cwebp -pre 4 -sharp_yuv -q 90"
PNG_AVIF_CMD="avifenc"
PNG_HEIF_CMD="heif-enc -q 45"
PNG_JXL_CMD="cjxl -d 1"
JPG_WEBP_CMD="cwebp -q 85"
JPG_AVIF_CMD="avifenc"
JPG_HEIF_CMD="heif-enc -q 40"
JPG_JXL_CMD="cjxl -q 85"
GIF_CMD="gifsicle -O1"
GIF_WEBP_CMD="gif2webp -m 0 -mixed -q 90"
GIF_AVIF_CMD="convert -quality 90"
GIF_APNG_CMD="gif2apng"
GIF_OPTIPNG_CMD="optipng -o0"
GIF_ZOPFLIPNG_CMD="zopflipng -q --lossy_transparent --lossy_8bit"
GIF_JPEG_CMD="cjpeg -quality 90 -optimize -progressive -sample 1x1"
GIF_JXL_CMD="cjxl -d 1"
WEBP_AVIF_CMD="avifenc"
WEBP_OPTIPNG_CMD="optipng -o0"
WEBP_ZOPFLIPNG_CMD="zopflipng --lossy_transparent --lossy_8bit"
WEBP_JXL_CMD="cjxl -d 1"
APNG_WEBP_CMD="convert -quality 90"
SVG_CMD="svgo"
fi
job_limit () { NJOBS=${1:-$(nproc)}
# Check number of running jobs
local joblist=($(jobs -rp))
while (( ${#joblist[*]} >= NJOBS ))
do
echo "! job_limit ${#joblist[*]}"
# Wait for any job to finish
local command='wait '${joblist[0]}
for job in ${joblist[@]:1}
do
command+=' || wait '$job
done
eval $command
joblist=($(jobs -rp))
done
}
validate() { FILE=$1; FILE_C=$2; TYPE=$3; IMAGE=$4
if [[ ! -f "$FILE_C" ]]; then
return
fi
local FILE_SZ=$(wc -c <"$FILE")
local FILE_C_SZ=$(wc -c <"$FILE_C")
local ABSDIFF=$((FILE_SZ - FILE_C_SZ))
local RELDIFF=$((100 - FILE_C_SZ * 100 / FILE_SZ))
if (( ABSDIFF < MIN_ABSDIFF || RELDIFF < MIN_RELDIFF || FILE_C_SZ == 0 )); then
rm "$FILE_C"
else
local MIMETYPE=$(file --brief --mime $FILE)
touch -r "$FILE" "$FILE_C"
alt_path /alt_path.db "/$FILE" "/$FILE_C" "$IMAGE" "$TYPE" "$FILE_C_SZ" "$MIMETYPE"
fi
}
touch /mutex
foreach() { FILES=$1; FUNC=$2
set +x
for FILE in $FILES; do
echo "> $FILE"
(
local out=$( ( set -x; "$FUNC" "$FILE" ) 2>&1 | sed -e 's/^/| /' | sed -e 's/\r/\r| /' )
{
flock $fd
echo "< $FILE"
echo "$out"
} {fd}</mutex
) &
job_limit
done
set -x
}
## list files to be compressed
cd "$ASSET_DIR"
PNG_FILES=$(
find . -type f \
-iname '*.png' \
-size +1 \
-printf '%P\n' \
)
JPEG_FILES=$(
find . -type f \
\( -iname '*.jpg' -or -iname '*.jpeg' \) \
-size +1 \
-printf '%P\n' \
)
GIF_FILES=$(
find . -type f \
-iname '*.gif' \
-size +1 \
-printf '%P\n' \
)
WEBP_FILES=$(
find . -type f \
-iname '*.webp' \
-size +1 \
-printf '%P\n' \
)
APNG_FILES=$(
find . -type f \
-iname '*.apng' \
-size +1 \
-printf '%P\n' \
)
SVG_FILES=$(
find . -type f \
-iname '*.svg' \
-size +1 \
-printf '%P\n' \
)
JSON_FILES=$(
find . -type f \
-iname '*.json' \
-size +1 \
-printf '%P\n' \
)
JS_FILES=$(
find . -type f \
-iname '*.js' \
-size +1 \
-printf '%P\n' \
)
COMPRESSIBLE_FILES=$(
find . -type f \
-not -iname '*.gif' \
-not -iname '*.png' \
-not -iname '*.jpg' \
-not -iname '*.jpeg' \
-not -iname '*.webp' \
-not -iname '*.heif' \
-not -iname '*.avif' \
-not -iname '*.jxl' \
-not -iname '*.gz' \
-not -iname '*.bz2' \
-not -iname '*.zst' \
-not -iname '*.br' \
-not -iname '*.xz' \
-not -iname '*.woff' \
-not -iname '*.woff2' \
-printf '%P\n' \
)
## optimize svg images
process_svg() { FILE=$1
$SVG_CMD "$FILE"
}
foreach "$SVG_FILES" process_svg
## optimize gif images
process_gif() { FILE=$1
$GIF_CMD -b "$FILE"
$GIF_WEBP_CMD "$FILE" -o "$FILE.webp"
validate "$FILE" "$FILE.webp" "image/webp" true
$GIF_AVIF_CMD "$FILE" "$FILE.avif"
validate "$FILE" "$FILE.avif" "image/avif" true
$GIF_APNG_CMD "$FILE" "$FILE.apng"
validate "$FILE" "$FILE.apng" "image/apng" true
$GIF_JXL_CMD "$FILE" "$FILE.jxl"
validate "$FILE" "$FILE.jxl" "image/jxl" true
FRAMES=$(identify -format '%n ' "$FILE" | cut -f1 -d' ')
if [ "$FRAMES" == "1" ]; then
$GIF_OPTIPNG_CMD -out "$FILE.png" "$FILE"
$GIF_ZOPFLIPNG_CMD "$FILE.png" "$FILE.zopflipng"
[[ -f "$FILE.zopflipng" ]] && mv -f "$FILE.zopflipng" "$FILE.png"
validate "$FILE" "$FILE.png" "image/png" true
OPAQUE=$(identify -format '%[opaque]' "$FILE")
if [ "$OPAQUE" == "true" ]; then
convert "$FILE" pnm:- | $GIF_JPG_CMD -outfile "$FILE.jpg"
validate "$FILE" "$FILE.jpg" "image/jpeg" true
fi
fi
}
foreach "$GIF_FILES" process_gif
## optimize jpeg images
process_jpeg() { FILE=$1
$JPG_WEBP_CMD "$FILE" -o "$FILE.webp"
$JPG_AVIF_CMD "$FILE" "$FILE.avif"
$JPG_HEIF_CMD -o "$FILE.heif" "$FILE"
$JPG_JXL_CMD "$FILE" "$FILE.jxl"
QUALITY=$(identify -format '%[quality]' "$FILE")
if (( QUALITY >= 88 )); then
djpeg "$FILE" | cjpeg -quality 85 -optimize -progressive -outfile "$FILE.new"
mv -f "$FILE.new" "$FILE"
else
jpegtran -optimize -progressive -outfile "$FILE" "$FILE"
fi
validate "$FILE" "$FILE.webp" "image/webp" true
validate "$FILE" "$FILE.avif" "image/avif" true
validate "$FILE" "$FILE.heif" "image/heif" true
validate "$FILE" "$FILE.jxl" "image/jxl" true
}
foreach "$JPEG_FILES" process_jpeg
## optimize png images
process_png() { FILE=$1
$PNG_OPTIPNG_CMD "$FILE"
$PNG_ZOPFLIPNG_CMD "$FILE" "$FILE.zopflipng"
[[ -f "$FILE.zopflipng" ]] && mv -f "$FILE.zopflipng" "$FILE"
$PNG_WEBP_CMD "$FILE" -o "$FILE.webp"
validate "$FILE" "$FILE.webp" "image/webp" true
$PNG_AVIF_CMD "$FILE" "$FILE.avif"
validate "$FILE" "$FILE.avif" "image/avif" true
$PNG_HEIF_CMD -o "$FILE.heif" "$FILE"
validate "$FILE" "$FILE.heif" "image/heif" true
$PNG_JXL_CMD "$FILE" "$FILE.jxl"
validate "$FILE" "$FILE.jxl" "image/jxl" true
OPAQUE=$(identify -format '%[opaque]' "$FILE")
if [ "$OPAQUE" == "true" ]; then
convert "$FILE" pnm:- | cjpeg -quality 90 -optimize -progressive -sample 1x1 -outfile "$FILE.jpg"
validate "$FILE" "$FILE.jpg" "image/jpeg" true
fi
}
foreach "$PNG_FILES" process_png
## optimize webp images
process_webp() { FILE=$1
# `identify -format %n` does not work correctly for webp
FRAMES=$(webpinfo -quiet -summary "$FILE" | grep 'Number of frames:' | cut -f4 -d' ')
if [ "$FRAMES" == "1" ]; then
dwebp "$FILE" -o "$FILE.png"
$WEBP_OPTIPNG_CMD "$FILE.png"
$WEBP_ZOPFLIPNG_CMD "$FILE.png" "$FILE.zopflipng"
[[ -f "$FILE.zopflipng" ]] && mv -f "$FILE.zopflipng" "$FILE.png"
# we currently can't yet generate animated AVIF
# we use the PNG because avifenc can not read webp
$WEBP_AVIF_CMD "$FILE.png" "$FILE.avif"
validate "$FILE" "$FILE.avif" "image/avif" true
validate "$FILE" "$FILE.png" "image/png" true
$WEBP_JXL_CMD "$FILE" "$FILE.jxl"
validate "$FILE" "$FILE.jxl" "image/jxl" true
OPAQUE=$(identify -format '%[opaque]' "$FILE")
if [ "$OPAQUE" == "true" ]; then
convert "$FILE" pnm:- | cjpeg -quality 85 -optimize -progressive -outfile "$FILE.jpg"
validate "$FILE" "$FILE.jpg" "image/jpeg" true
fi
fi
}
foreach "$WEBP_FILES" process_webp
## optimize apng images
process_webp() { FILE=$1
$APNG_WEBP_CMD "apng:$FILE" "$FILE.webp"
validate "$FILE" "$FILE.webp" "image/webp" true
}
foreach "$WEBP_FILES" process_webp
## minify json files
minify_json() { FILE=$1
jq -c -S <"$FILE" >"$FILE.jq" || rm -f "$FILE.jq"
mv -f "$FILE.jq" "$FILE"
}
foreach "$JSON_FILES" minify_json
## minify js files
minify_js() { FILE=$1
uglifyjs --compress --mangle -o "$FILE.minifyjs" -- "$FILE" || rm -f "$FILE.minifyjs"
mv -f "$FILE.minifyjs" "$FILE"
}
foreach "$JS_FILES" minify_js
## precompress uncompressed files
wait # some files that we need to compress may still be being worked on
check_file() { FILE=$1
if [ ! -f "$FILE" ]; then echo "$FILE does not exist"; exit -1; fi
local FILE_GZIP="$FILE.gz"
if [ -f "$FILE_GZIP" ]; then echo "$FILE_GZIP already exists"; exit -2; fi
local FILE_BROTLI="$FILE.br"
if [ -f "$FILE_BROTLI" ]; then echo "$FILE_BROTLI already exists"; exit -3; fi
local FILE_ZSTD="$FILE.zst"
if [ -f "$FILE_ZSTD" ]; then echo "$FILE_ZSTD already exists"; exit -4; fi
local FILE_ZSTD="$FILE.zst-dict"
if [ -f "$FILE_ZSTD" ]; then echo "$FILE_ZSTD already exists"; exit -4; fi
}
for FILE in $COMPRESSIBLE_FILES; do
check_file "$FILE"
done
mkdir /dict
#echo "$COMPRESSIBLE_FILES" >/filelist
#zstd --train -o /dict/zstd --maxdict=10000 --filelist=/filelist
compress_file() { FILE=$1
local FILE_SZ=$(wc -c <"$FILE")
if (( FILE_SZ < MIN_ABSDIFF )); then
return
fi
local FILE_GZIP="$FILE.gz"
$GZIP_CMD "$FILE" > "$FILE_GZIP"
validate "$FILE" "$FILE_GZIP" gzip false
local FILE_BROTLI="$FILE.br"
$BROTLI_CMD "$FILE" > "$FILE_BROTLI"
validate "$FILE" "$FILE_BROTLI" br false
local FILE_ZSTD="$FILE.zst"
$ZSTD_CMD "$FILE" > "$FILE_ZSTD"
validate "$FILE" "$FILE_ZSTD" zstd false
#local FILE_ZSTD="$FILE.zst-dict"
#$ZSTD_DICT_CMD "$FILE" > "$FILE_ZSTD"
#validate "$FILE" "$FILE_ZSTD" zstd-dict false
}
foreach "$COMPRESSIBLE_FILES" compress_file
wait # until all files are processed
alt_path /alt_path.db >/alt_path.json
jq </alt_path.json