make-png-icon

#! /bin/sh

INKSCAPE="inkscape"
PNGCRUSH="pngcrush"
PNGCRUSH_ARGS="-q"
SVG_INPUT="glance-icon.svg"
PNG_OUTPUT="glance-icon.png"
DPI="162" # works out to a 128x128 px PNG
OUTDIR="../pyglance/glance/"

command_unavailable() {
	command -v "$1" > /dev/null
	if [ $? = 0 ] ; then
		return 1
	fi
	return 0
}

if command_unavailable "$INKSCAPE" ; then
	echo "FATAL ERROR: \"$INKSCAPE\" is unavailable."
	exit 1
fi
$INKSCAPE "$SVG_INPUT" --export-png="$PNG_OUTPUT" --without-gui --export-dpi="$DPI" | egrep -v '^(DPI|Background RRGGBBAA|Bitmap saved as): '
if [ ! $? ]; then
	echo "FATAL ERROR: \"$INKSCAPE\" failed."
	exit 1
fi

if command_unavailable "$PNGCRUSH" ; then
	echo "Notice: \"$PNGCRUSH\" is not available; the resulting icon will be a bit (~15%) larger than necessary"
else
	mv "$PNG_OUTPUT" "$PNG_OUTPUT.tmp"
	"$PNGCRUSH" "$PNGCRUSH_ARGS" "$PNG_OUTPUT.tmp" "$PNG_OUTPUT" 
	if [ ! $? ]; then
		echo "Notice: \"$PNGCRUSH\" failed. The resulting icon will be a bit (~15%) larger than necessary"
		cp "$PNG_OUTPUT.tmp" "$PNG_OUTPUT"
	fi
	rm "$PNG_OUTPUT.tmp"
fi

cp "$PNG_OUTPUT" "$OUTDIR"