#!/bin/sh

set -e

DATA=/var/lib/duhome

case "$1" in
    init)
	mkdir -p $DATA
	cd $DATA
	git init
	;;
    save)
	cd $DATA
	if [ -n "$(git ls-files)" ]; then
	    git rm --force --quiet '*' # Remove old data - perhaps, some homes were removed
	fi
	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@$(hostname -f)" \
	    git commit --quiet -m 'Automatic commit' "$@" > /dev/null || :
	;;
    status)
	cd $DATA
	git ls-files --with-tree=HEAD | while read f; do
	    printf "%-8s\t%s\n" "$f" "$(git show "HEAD:$f")"
	done | sort -h -k2
	;;
    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