#
# git-flow -- A collection of Git extensions 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
#

VERSION_PREFIX=$(git config --get gitflow.prefix.versiontag)
PREFIX=$(git config --get gitflow.prefix.support || echo support/)
FLAG_FETCH=1

warn "note: The support subcommand is still very EXPERIMENTAL!"
warn "note: DO NOT use it in a production situation."

usage() {
	echo "usage: git flow support [list] [-v]"
	echo "       git flow support start <version> <base>"
}

cmd_default() {
	cmd_list "$@"
}

cmd_list() {
	DEFINE_boolean verbose false 'verbose (more) output' v
	parse_args "$@"

	SUPPORT_BRANCHES="$(echo "$LOCAL_BRANCHES" | grep "^$PREFIX")"
	if [ -z "$SUPPORT_BRANCHES" ]; then
		warn "No support branches exist."
		exit 0
	fi

	CURRENT_BRANCH=$(git branch | grep '^\* ' | grep -v 'no branch' | sed 's/^* //g')
	SHORT_NAMES=$(echo "$SUPPORT_BRANCHES" | sed "s?^$PREFIX??g")
	# determine column width first
	width=0
	for branch in $SHORT_NAMES; do
		len=$(($(echo "$branch" | wc -c) - 1))
		width=$(max $width $len)
	done
	width=$(($width + 3))

	for branch in $SHORT_NAMES; do
		fullname="$PREFIX$branch"
		base=$(git merge-base "$fullname" "$MASTER_BRANCH")
		master_sha=$(git rev-parse "$MASTER_BRANCH")
		branch_sha=$(git rev-parse "$fullname")
		if [ "$fullname" = "$CURRENT_BRANCH" ]; then
			printf "* "
		else
			printf "  "
		fi
		if flag verbose; then
			printf "%-${width}s" "$branch"
			if [ "$branch_sha" = "$master_sha" ]; then
				printf "(no commits yet)"
			else
				tagname=$(git name-rev --tags --no-undefined --name-only $base)
				if [ "$tagname" != "" ]; then
					nicename="$tagname"
				else
					nicename="$(git rev-parse --short $base)"
				fi
				printf "(based on $nicename)"
			fi
		else
			printf "%s" "$branch"
		fi
		echo
	done
}

cmd_help() {
	usage
	exit 0
}

parse_args() {
	# parse options
	FLAGS "$@" || exit $?
	eval set -- "${FLAGS_ARGV}"

	# read arguments into global variables
	VERSION="$1"
	BASE="$2"
	BRANCH=$PREFIX$VERSION
}

require_version_arg() {
	if [ "$VERSION" = "" ]; then
		warn "Missing argument <version>"
		usage
		exit 1
	fi
}

require_base_arg() {
	if [ "$BASE" = "" ]; then
		warn "Missing argument <base>"
		usage
		exit 1
	fi
}

require_base_is_on_master() {
	if ! git branch --contains "$BASE" 2>/dev/null \
			| sed 's/[* ] //g' \
	  		| grep -q "^$MASTER_BRANCH\$"; then
		die "fatal: Given base '$BASE' is not a valid commit on '$MASTER_BRANCH'."
	fi
}

cmd_start() {
	parse_args "$@"
	require_version_arg
	require_base_arg
	require_base_is_on_master

	# sanity checks
	gitflow_require_clean_working_tree

	# fetch remote changes
	if [ $FLAG_FETCH -eq 1 ]; then
		git fetch -q $ORIGIN $BASE
	fi
	gitflow_require_branch_absent $BRANCH

	# 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
}