# This is here because scanimage's batch mode is broken for my scanner

OUTPUT_FILE="${1:-./scan_"$(date)".pdf}"

if [ -e "$OUTPUT_FILE" ]; then
	echo "$OUTPUT_FILE" already exists, you are probably making a mistake!
	exit 1
fi

tempdir="$(mktemp -d)"
counter=1

while :; do
	ok="true"
	echo "Scanning page $counter"

	# If no size is set, the output will be wonky-sized
	# 210,297 is the size of A4
	scanimage -x 210 -y 297 --resolution 300 -o "$tempdir/easyscan_$counter.pdf" >/dev/null 2>&1 ||
		{
			echo "Failed to scan page..."
			ok="false"
		}

	IFS= read -r -p "Continue scanning? [Y/n] " cont
	case "$cont" in
	[nN])
		echo "Exiting..."
		break
		;;
	[yY] | *)
		if $ok; then
			counter=$((counter += 1))
		fi
		;;
	esac
done

# Multiple files are scanned, join them
merged_filename="$tempdir/easyscan_final.pdf"
pdfunite "$tempdir"/*.pdf "$merged_filename"

# Copy scan to current directory
mkdir -p "$(dirname "$OUTPUT_FILE")"
cp "$merged_filename" "$OUTPUT_FILE"

# Make sure I don't remove things other than pdf
rm "$tempdir/"*.pdf
rm -d "$tempdir"