#!/bin/sh
# Generate bunch of favicons, the original should preferrably be 500x500 png image

if [ $# -ne 1 ]; then
        echo USAGE: $0 favicon-original.png
        exit 1
fi

ORIGINAL=$1

# IE is still braindead so still use favicon.ico
convert -resize x16 -gravity center -crop 16x16+0+0 -flatten -colors 256 ${ORIGINAL} output-16x16.ico
convert -resize x32 -gravity center -crop 32x32+0+0 -flatten -colors 256 ${ORIGINAL} output-32x32.ico
convert output-16x16.ico output-32x32.ico favicon.ico
rm output-16x16.ico output-32x32.ico
# Then, HTML needs to specify size="XxY" as largest size due to browser bugs
echo '<link rel="shortcut icon" href="/favicon.ico" sizes="32x32" />'

# Apple favicons
for SIZE in 180 152 144 120 114 76 72 60 57
do
        convert -resize x${SIZE} ${ORIGINAL} apple-touch-icon-${SIZE}x${SIZE}.png
        echo "<link rel=\"apple-touch-icon\" sizes=\"${SIZE}x${SIZE}\" href=\"apple-touch-icon-${SIZE}x${SIZE}.png\" />"
done

# Normal favicons
for SIZE in 192 160 96 32 16
do
        convert -resize x${SIZE} ${ORIGINAL} favicon-${SIZE}x${SIZE}.png
        echo "<link rel=\"icon\" type=\"image/png\" sizes=\"${SIZE}x${SIZE}\" href=\"favicon-${SIZE}x${SIZE}.png\" />"
done