#!/bin/sh

log()
{
	echo $@
}

err()
{
	log $@
}

fatal()
{
	err $@
	exit 1
}

marker()
{
	log "# ------------- $@"
}

fat_marker()
{
	log "# ==================================================== $@"
}

config()
{
	# guess pdir
	pdir=`pwd`
	while [ `cat $pdir/CVS/Repository 2>/dev/null` != proj ]; do
		[ "$pdir" = / ] && fatal "didn't find \"proj\" in directory components"
		pdir=`dirname $pdir`
	done
	pdirs=`(cd $pdir; ls -d */.git 2>/dev/null | sed 's%/.git%%')`
}

run_git()
{
	marker git "$@"
	eval git "$@"
}

# ------------- commands
run()
{(
	local cmd=$1
	local d

	shift
	config
	cd $pdir

	set -e
	for d in $pdirs; do
		run_git -C $d $cmd "$@"
	done
)}

clone()
{(
	local p
	config
	cd $pdir
	local fromuser=$PGIT_CLONE_FROM_USER
	local login=$JANWARE_USER
	local projects="$PGIT_CLONE_PROJECTS"
	[ "$login" ] || login=`whoami`
	[ "$fromuser" ] || fromuser=`whoami`
	local git_srv_admin="$SSH $login@git.jannet.de /opt/jw-build/bin/git-srv-admin.sh"
	if [ -z "$projects" ]; then
		projects=`$git_srv_admin -u $fromuser -j list-personal-projects`
		[ "$?" != 0 ] && exit 1
	fi
	set -e
	for p in $projects; do
		local pullurl=ssh://$login@git.jannet.de/srv/git/$fromuser/proj/$p
		local pushurl=ssh://$login@git.jannet.de/srv/git/$login/proj/$p
		fat_marker "Fetching project $p from user $fromuser"
		if [ "$fromuser" = "$login" ]; then
			if [ -d $p ]; then
				run_git -C $p pull
			else
				run_git clone ssh://$login@git.jannet.de/srv/git/$fromuser/proj/$p
			fi
			run_git -C $p submodule init || fatal git submodule init failed in $p
			run_git -C $p submodule update || fatal git submodule update failed in $p
		else
			local remotename="user-$fromuser"
			if [ -d $p ]; then
				run_git -C $p remote | grep -q "^$remotename$" || {
					run_git -C $p remote add $remotename $pullurl
					run_git -C $p remote set-url --push $remotename no_push
				}
				run_git -C $p pull $remotename master
			else
				set -x
				run_git clone ssh://$login@git.jannet.de/srv/git/$fromuser/proj/$p
				run_git -C $p remote rename origin $remotename || fatal failed to rename remote in $p
				run_git -C $p remote set-url --push $remotename no_push
				$git_srv_admin -u $login -j create-personal-project $p
				run_git -C $p remote add origin $pushurl
				run_git -C $p push origin master
				run_git -C $p branch --set-upstream-to origin/master master
				set +x
			fi
			run_git -C $p submodule init || fatal git submodule init failed in $p
			run_git -C $p submodule update || fatal git submodule update failed in $p
		fi
	done
)}

diff()
{(
	local d
	config
	cd $pdir
	for d in $pdirs; do
		# marker $d
		run_git -C $d diff --src-prefix=a/$d/ --dst-prefix=b/$d/ "$@"
	done
)}

SSH=ssh
[ "$GIT_SSH" ] && SSH=$GIT_SSH

cmd=$1
shift
case $cmd in
	clone|diff)
		$cmd "$@"
		;;
	*)
		run $cmd "$@"
		;;
esac