#!/bin/sh

# Copyright © 2011 Jonas Smedegaard <dr@jones.dk>
# Description: Create favicon from SVG file
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Depends: inkscape, netpbm
#
# TODO: Use tempdir
# TODO: Check and ask if outfile already exist
# TODO: Add --force option to skip asking for overwriting

set -e

infile="$1"
id="$2"

if ! [ -s "$infile" ]; then
	echo "Error: wrong inputfile \"$infile\" provided!"
	echo
	echo "Usage: $0 SVGFILE [OBJECT-ID]"
	exit 1
fi

dir=$(dirname "$infile")
stem=$(basename "$infile" | sed 's/\..*//')

mkpgmpluspgm() {
	set -e

	size="$1"
	depth="$2"

	inkscape -w $size ${id:+-i "$id"} -e "$dir/${stem}-$size.png" "$infile" >/dev/null
# fIXME: reduce colors, but only when needed (else pnmquant fails)
#	pngtopnm "$dir/${stem}-$size.png" | pnmquant $depth > "$dir/${stem}-$size.ppm"
	pngtopnm "$dir/${stem}-$size.png" > "$dir/${stem}-$size.ppm"
	pngtopnm -alpha "$dir/${stem}-$size.png" > "$dir/${stem}-$size.pgm"
	echo "$dir/${stem}-$size.ppm" "$dir/${stem}-$size.pgm"
}

pnmfiles="$pnmfiles $(mkpgmpluspgm 16 16)"
pnmfiles="$pnmfiles $(mkpgmpluspgm 32 16)"
pnmfiles="$pnmfiles $(mkpgmpluspgm 48 256)"
ppmtowinicon -output "$dir/${stem}.ico" -andpgms $pnmfiles
rm $dir/${stem}-??.png $pnmfiles