#!/bin/sh

set -e

DATA=/var/lib/duhome

case "$1" in
    init)
	mkdir -p $DATA
	cd $DATA
	git init
	;;
    save)
	cd $DATA
	for i in /home/*; do
	    du -shx $i | cut -f1 > ${i#/home/};
	    git add ${i#/home/}
	done
	;;
    commit)
	cd $DATA
	shift
	GIT_AUTHOR_NAME="$0" GIT_AUTHOR_EMAIL="$USER@$(hostname -f)" \
	    git commit --quiet -m 'Automatic commit' "$@" || :
	;;
    status)
	cd $DATA
	grep . *|sort -h -k2 -t:
	;;
    log)
	cd $DATA
	dir=$2
	if ! [ "$dir" ]; then echo "Missing directory name" >&2; exit 1; fi
	if ! [ -f "$dir" ]; then echo "No information about $dir in $DATA" >&2; exit 1; fi
	git log --format='%H %ci' -- $dir | while read commit date; do
	    echo $date $(git show $commit:$dir)
	done
	;;
    help|"")
	cat <<EOF
Usage: $0 <command> [ <options> ]

Commands:
- init
- save
- commit [ <git commit arguments> ]
- status
- log <directory>
EOF
	;;
esac