nixos-config/packages/lib/crushpng.sh

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#!/bin/sh
set -ex
if [ "$(wc -c $1 | awk '{print $1}')" -le $3 ]; then
cp $1 $2
exit 0
fi
for i in $(seq 100 -1 0); do
cat $1 | pngquant --quality 0-$i - > $2
[ "$(wc -c $2 | awk '{print $1}')" -le $3 ] && exit 0
done
rm $2
exit 1