#!/bin/bash -eu
# uses graphics magick to extract images from a pdf as png

if ! which gm &>/dev/null; then
	echo "requires gm convert..." && exit 1
elif [ -z "${1:-}" ] || [ ! -f "$1" ]; then
	echo "No file supplied..." && exit 1
fi

base=$(basename "$1")
out=${base%.*}
if [ -n "${2:-}" ] && [[ ! -f "$2" || -d "$2" ]]; then
	out="$2"
fi

mkdir -p "$out"
gm convert -density 300 "$1" +adjoin ${out}/%d.png