#!/bin/sh
set -e

OUTPUT_FILE=sha256sums.txt
> $OUTPUT_FILE

format_size() {
	bytes=$1
	if [ $bytes -lt 104857600 ]; then
		kib=$(( bytes / 1024 ))
		echo "${bytes} bytes : ${kib} KiB"
	else
		mib=$(( bytes / 1048576 ))
		echo "${bytes} bytes : ${mib} MiB"
	fi
}

first=1

found_any=0

for pattern in "*.tar.gz" "*.zip" "*.tar.xz"; do
	for file in $pattern; do
		[ -e "$file" ] || continue
		found_any=1

		size=$(stat -c %s "$file")
		size_fmt=$(format_size "$size")
		sha=$(sha256sum "$file" | awk '{print $1}')

		if [ $first -eq 0 ]; then
			echo >> $OUTPUT_FILE
		fi

		echo "Name: $file" >> $OUTPUT_FILE
		echo "Size: $size_fmt" >> $OUTPUT_FILE
		echo "SHA256: $sha" >> $OUTPUT_FILE

		first=0
	done
done

if [ $found_any -eq 0 ]; then
	echo "No release archives found to checksum." >&2
	exit 1
fi