Created
February 22, 2019 20:35
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#!/bin/bash | |
# convert.sh | |
# util for generating resized images at multiple common display resolutions | |
SIZES="720 750 1080 1100 1440 1680 2880" | |
EXTS="jpg JPG jpeg JPEG" | |
print_res() { | |
for f in "$@"; do | |
echo "$f: $(file "$f" | grep -Eo '[0-9]+x[0-9]+' | tail -n 1)"; | |
done | |
} | |
split_name() { | |
local f=$1 | |
local e | |
filename="" | |
ext="" | |
for e in $EXTS; do | |
echo $f | egrep \."$e"\$ >/dev/null | |
if [[ $? -eq 0 ]]; then | |
filename=$(basename $f .$e) | |
ext="$e" | |
return | |
fi | |
done | |
} | |
resize() { | |
if [ $# -eq 0 ]; then | |
return | |
fi | |
local f=$1 | |
if [ ! -f "$f" ]; then | |
echo "warning: $f not found" | |
return | |
fi | |
echo "* resizing $f ..." | |
split_name $f | |
if [[ -z "$filename" ]]; then | |
echo "error: unknown file ext for $f" | |
return | |
fi | |
# convert images | |
for size in $SIZES; do | |
echo " - ${size}px" | |
convert $f -resize "${size}x" -blur 0x2 "${filename}-${size}w-o.${ext}" | |
/usr/local/opt/mozjpeg/bin/cjpeg -outfile "${filename}-${size}w.${ext}" "${filename}-${size}w-o.${ext}" | |
rm -f "${filename}-${size}w-o.${ext}" | |
done | |
echo " done" | |
# print srcset for html | |
local src | |
read -r -d '' src <<-EOF | |
srcset="$(for size in $SIZES; do | |
echo " ${filename}-${size}w.${ext} ${size}w,"; | |
done;)" | |
EOF | |
echo "$src" | sed -E -e 's/" +/"/' | sed -E -e 's/,"$/"/' | |
echo | |
# print image-set for css | |
read -r -d '' src <<-EOF | |
image-set($(for size in $SIZES; do | |
echo " url(\"${filename}-${size}w.${ext}\") 1x,"; | |
done;)) | |
EOF | |
echo "$src" | sed -E -e 's/\( +/(/' | sed -E -e 's/,)$/)/' | |
} | |
if [ $# -eq 0 ]; then | |
echo "usage: $0 file.jpg [...]" | |
fi | |
for f in "$@"; do | |
resize "$1" | |
done |
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