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#!/usr/bin/env bash
sizes=(16 32 64 128 256 512)
largfile='icon_512x512@2x.png'
if [ ! -f "$largfile" ]; then
convert -background none -resize 1024x1024 "$1" "$largfile"
fi
for s in "${sizes[@]}"; do
echo $s
convert -background none -resize ${s}x${s} "$largfile" "icon_${s}x$s.png"
done
cp 'icon_32x32.png' 'icon_16x16@2x.png'
mv 'icon_64x64.png' 'icon_32x32@2x.png'
cp 'icon_256x256.png' 'icon_128x128@2x.png'
cp 'icon_512x512.png' 'icon_256x256@2x.png'
mkdir icon.iconset
mv icon_*x*.png icon.iconset
iconutil -c icns icon.iconset
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