#!/bin/sh

# didn't consider $HOME contain space? need improve?
while getopts clLsSmM opt; do
	case $opt in
		c|l|s)	dir="$HOME"
				cmd="git --git-dir=$dir/.cfg$opt/ --work-tree=$dir"
				mods="$XDG_CONFIG_HOME/myconf/cfg${opt}_mods";;
		L|S)	dir=/etc/
				cmd="sudo git --git-dir=$dir/.cfg$opt/ --work-tree=$dir"
				mods="/etc/myconf/cfg${opt}_mods";;
				# -rw-r--r-- == binary 110100100 == octal 644
				# https://stackoverflow.com/a/1796009
		m)		$cmd ls-tree -r --name-only --full-tree HEAD | nawk -v a="$dir/" '{printf("%s%s\n",a,$0)}' | tr '\n' '\0' | xargs -0 ls -ldA -- | grep -v '^l\|^d' | nawk '{k=0;for(i=0;i<=8;i++)k+=((substr($1,i+2,1)~/[rwx]/)*2^(8-i));if(k){for(i=10;$i;i++)$9=$9" "$i;printf("%0o %s\n",k,$9)}}' > "$mods"
				exit;;
		M)		while read -r mod path; do
					sudo chmod -c "$mod" -- "$path"
				done < "$mods"
				exit;;
		\?)	exit 1;;
	esac
done
shift $((OPTIND-1))
$cmd "$@"