#!/bin/sh

BACKGROUND="#0A0A0A"
THUMBSIZE=64
umask 077

case "$#" in
(2)
	;;
(*)
	printf "usage: %s file\n" "$0" >&2
	exit 1
	;;
esac

case "$2" in
(*/*)
	mkdir -p "${2%/*}"
	;;
(*)
	;;
esac

case "${1##*.}" in
png|jpg|jpeg|gif|xpm|xbm|ppm)
	convert "${1}[0]" -background "$BACKGROUND" -flatten \
		-define filename:literal=true -format ppm \
		-thumbnail "${THUMBSIZE}x${THUMBSIZE}" \
		"${2}"
	;;
webm|mp4|mkv|ogv)
	ffmpegthumbnailer -c png -i "${1}" -o - -s "${THUMBSIZE}" \
		| convert - -define filename:literal=true -format ppm \
		"${2}"
	;;
svg)
	rsvg-convert -h "${THUMBSIZE}" "${1}" \
		| convert - -format ppm "${2}"
	;;
pdf)
	pdftoppm -f 1 -l 1 -scale-to "${THUMBSIZE}" -singlefile \
		"${1}" "${2%.ppm}"
	;;
*)
	exit 1
	;;
esac 2>/dev/null