#!/usr/bin/env bash

die()
{
	echo "$*" >&2
	exit 1
}
git_rdiff()
{
	git fetch -q
	GITREMOTEDIFF=$( git diff --name-status remotes/origin/master )
	if [ -n "$GITREMOTEDIFF" ];then
		echo "$( pwd ) not synchronised with remote" 1>&2
		echo "$GITREMOTEDIFF" 1>&2
	fi
}
git_st()
{
	GITSTATUS=$( git status --porcelain )
	if [ -n "$GITSTATUS" ]; then
		echo "Untracked files in $( pwd )" 1>&2
		echo "$GITSTATUS" 1>&2
	fi

}
annex_copy() {
	# copy auto from/to every remote
	for remote in $(git remote)
	do
		git ls-remote $remote 2>&1 > /dev/null && git-annex get --auto --fast --quiet --from $remote
		git ls-remote $remote 2>&1 > /dev/null && git-annex copy --auto --fast --quiet --to $remote
	done
}
annex_control() {
	UNUSED=$( git-annex unused --fast | grep -v checking | grep -v 'fast mode enabled' )
	if [ -n "$UNUSED" ]; then
		echo "Unused data in $( pwd )" 1>&2
		echo "++$UNUSED++" 1>&2
	fi
	# affiche les fichiers qui n'ont pas suffisamment de copies
	git-annex fsck --fast > /dev/null
}

CONF=${1:-$HOME/.sync.cfg}
# echo Configuration: $CONF
[ -r $CONF ] || die "Missing configuration: $CONF"

ORIG_DIR=$PWD
#echo "ORIG_DIR $ORIG_DIR"

PIDFILE=${CONF}.pid
#echo "PIDFILE: $PIDFILE"
[ -f $PIDFILE ] && die "Pidfile exists: $PIDFILE"
touch $PIDFILE

declare -a LINE
exec < $CONF
dir_ok=1
while read -a LINE; do
	# echo "${LINE[@]}"
	if [[ "${LINE[@]}" =~ ^\[.*\]$ ]]; then
		dir_head=${LINE[@]}
		# bash > 4.2 dir=${dir_head:1: -1}
		dir=${dir_head:1:${#dir_head}-2}
		# echo "DIR $dir"
		cd $ORIG_DIR
		cd $dir
		dir_ok=$?
		pwd
	elif [[ "${LINE[@]}" =~ ^# ]]; then
		:
		# echo COMMENT
	elif [ $dir_ok -eq 0 ]; then
		action="${LINE[0]}"
		action_args="${LINE[@]:1}"
		#echo ACTION $action
		#echo ARGS $action_args
		case "$action" in
			annex.watch )
				git-annex watch --quiet ;;
			annex.sync )
				git-annex sync --fast --quiet 2> /dev/null ;;
			annex.copy)
				annex_copy ;;
			annex.to )
				git-annex copy --auto --fast --quiet --to $action_args ;;
			annex.from )
				git-annex copy --auto --fast --quiet --from $action_args ;;
			annex.control )
				annex_control ;;
			git.pull )
				git pull -q ;;
			git.diff )
				git_rdiff ;;
			git.status )
				git_st ;;
			git.push )
				git commit -a --allow-empty-message -m "" && git push --porcelain ;;
		esac
	fi
done

cd $ORIG_DIR
#echo "PIDFILE: $PIDFILE"
rm -f $PIDFILE
[ -f $PIDFILE ] && die "Pidfile still exists $PIDFILE"