#
# gitflow -- A collection of Git wrapper scripts to provide high-level
# repository operations for Vincent Driessen's branching model:
#
# Original blog post presenting this model is found at:
#    http://nvie.com/archives/323
#
# Feel free to contribute to this project at:
#    http://github.com/nvie/gitflow
#
# Copyright (c) 2010 by Vincent Driessen
# Copyright (c) 2010 by Benedikt Böhm
#

usage() {
	echo "usage: git flow start feature <name> [<base>]"
	echo "       git flow finish feature <name> [<base>]"
	echo "       git flow publish feature <name>"
	echo "       git flow track feature <name>"
	# TODO
	#echo ""
	#echo "options:"
	#echo "--option    Explanation"
	#echo ""
	#echo "start-only options:"
	#echo "--option    Explanation"
	#echo ""
	#echo "finish-only options:"
	#echo "--rebase    Rebases the feature branch on top of develop, instead of merging"
	#echo "--squash    Squashes all commits of the feature branch into a single commit"
	#echo "            on develop"
	#echo "--push      Push to the origin repo when finished"
}

parse_args() {
	NAME="$1"
	BASE="${2:-develop}"
	if [ "$NAME" = "" ]; then
		echo "Missing argument <name>."
		usage
		exit 1
	fi
	BRANCH=feature/$NAME
}

cmd_help() {
	usage
	exit 0
}

cmd_start() {
	parse_args "$@"

	# sanity checks
	gitflow_check_clean_working_tree
	gitflow_require_branch_absent $BRANCH
	if [ "$BASE" = "develop" ]; then
		git fetch origin develop
		gitflow_require_branches_equal develop origin/develop
	fi

	# create branch
	git checkout -b $BRANCH $BASE

	echo
	echo "Summary of actions:"
	echo "- A new branch '$BRANCH' was created, based on '$BASE'"
	echo "- You are now on branch '$BRANCH'"
	echo ""
	echo "Now, start committing on your feature. When done, use:"
	echo ""
	echo "     git flow finish feature $NAME"
	echo
}

cmd_finish() {
	parse_args "$@"

	# sanity checks
	gitflow_check_clean_working_tree
	gitflow_require_branch $BRANCH
	git fetch origin
	if has origin/$BRANCH $REMOTE_BRANCHES; then
		gitflow_require_branches_equal $BRANCH origin/$BRANCH
	fi
	if [ "$BASE" = "develop" ]; then
		gitflow_require_branches_equal develop origin/develop
	fi

	# merge into BASE
	git checkout $BASE
	if [ "$(git rev-list -n2 $BASE..$BRANCH | wc -l)" = "1" ]; then
		git merge --ff $BRANCH
	else
		git merge --no-ff $BRANCH
	fi

	# delete branch
	# TODO: How do we handle merge conflicts here??
	git push origin :refs/heads/$BRANCH
	git branch -d $BRANCH

	echo
	echo "Summary of actions:"
	echo "- The feature branch '$BRANCH' was merged into '$BASE'"
	#echo "- Merge conflicts were resolved"		# TODO: Add this line when it's supported
	echo "- Feature branch '$BRANCH' has been removed"
	echo "- You are now on branch '$BASE'"
	echo
}

cmd_publish() {
	parse_args "$@"

	# sanity checks
	gitflow_check_clean_working_tree
	gitflow_require_branch $BRANCH
	git fetch origin
	gitflow_require_branch_absent origin/$BRANCH

	# create remote branch
	git push origin $BRANCH:refs/heads/$BRANCH
	git fetch origin

	# configure remote tracking
	git config branch.$BRANCH.remote origin
	git config branch.$BRANCH.merge refs/heads/$BRANCH
	git checkout $BRANCH

	echo
	echo "Summary of actions:"
	echo "- A new remote branch '$BRANCH' was created"
	echo "- The local branch '$BRANCH' was configured to track the remote branch"
	echo "- You are now on branch '$BRANCH'"
	echo
}

cmd_track() {
	parse_args "$@"

	# sanity checks
	gitflow_check_clean_working_tree
	gitflow_require_branch_absent $BRANCH
	git fetch origin
	gitflow_require_branch origin/$BRANCH

	# create tracking branch
	git checkout -b $BRANCH origin/$BRANCH

	echo
	echo "Summary of actions:"
	echo "- A new remote tracking branch '$BRANCH' was created"
	echo "- You are now on branch '$BRANCH'"
	echo
}