#!/bin/bash

[ -n "$2" ] && exit 0
[ -e "$1" ] || exit 1

# -F 'to be commited' -F 'vorgemerkte Änderungen'
inblock=false
declare -A stuff
re='core/(modules|rootfs)/([^/]+)/'
while IFS='' read -r line || [[ -n "$line" ]]; do
	if $inblock; then
		[ "$line" = '#' ] && break
		if [[ $line =~ $re ]]; then
			if [ -z "${stuff["${BASH_REMATCH[2]}"]}" ]; then
				stuff["${BASH_REMATCH[2]}"]=1
			else
				let stuff["${BASH_REMATCH[2]}"]++
			fi
		fi
	elif [[ "$line" == *"vorgemerkte Änderungen"* ]] || [[ "$line" == *"to be committed"* ]]; then
		inblock=true
	fi
done < "$1"

[ "${#stuff[@]}" -gt 2 ] && exit 0
[ "${#stuff[@]}" -lt 1 ] && exit 0

out=""
for key in "${!stuff[@]}"; do
	out+="/$key"
	#echo "$key = ${stuff["$key"]}"
done
sed -i "1s~^~[${out:1}] ~" "$1"