#!/bin/sh
#
# 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
#

# enable debug mode
if [ "$DEBUG" = "yes" ]; then
	set -x
fi

export GITFLOW_DIR=$(dirname "$0")
export GIT_DIR=$(git rev-parse --git-dir)
export MASTER_BRANCH=$(git config --get gitflow.branch.master || echo master)
export DEVELOP_BRANCH=$(git config --get gitflow.branch.develop || echo develop)
export ORIGIN=$(git config --get gitflow.origin || echo origin)
export README=$(git config --get gitflow.readme || echo README)

usage() {
	echo "usage: git flow <subcommand>"
	echo
	echo "Available subcommands are:"
	echo "   init      Initialize a new git repo with support for the branching model."
	echo "   feature   Manage your feature branches."
	echo "   release   Manage your release branches."
	echo "   hotfix    Manage your hotfix branches."
	echo "   support   Manage your support branches."
	echo "   version   Shows version information."
	echo
	echo "Try 'git flow <subcommand> help' for details."
}

main() {
	if [ $# -lt 1 ]; then
		usage
		exit 1
	fi

	# load common functionality
	. "$GITFLOW_DIR/gitflow-common"

	# use the shFlags project to parse the command line arguments
	. "$GITFLOW_DIR/gitflow-shFlags"
	FLAGS_PARENT="git flow"
	FLAGS "$@" || exit $?
	eval set -- "${FLAGS_ARGV}"

	# sanity checks
	SUBCOMMAND="$1"; shift

	if [ ! -e "$GITFLOW_DIR/git-flow-$SUBCOMMAND" ]; then
		usage
		exit 1
	fi

	if ! git rev-parse --git-dir >/dev/null; then
		die "Not a git repository"
	fi

	# run command
	. "$GITFLOW_DIR/git-flow-$SUBCOMMAND"
	FLAGS_PARENT="git flow $SUBCOMMAND"

	# test if the first argument is a flag (i.e. starts with '-')
	# in that case, we interpret this arg as a flag for the default
	# command
	SUBACTION="default"
	if [ "$1" != "" ] && ! echo "$1" | grep -q "^-"; then
		SUBACTION="$1"; shift
	fi
	if ! typeset -f "cmd_$SUBACTION" 2>&1 >/dev/null; then
		warn "Unknown subcommand: '$SUBACTION'"
		usage
		exit 1
	fi

	# run the specified action
	cmd_$SUBACTION "$@"
}

# helper functions for common reuse
max() { if [ "$1" -gt "$2" ]; then echo "$1"; else echo "$2"; fi; }

# convenience functions for checking whether flags have been set or not
flag() { eval FLAG=\$FLAGS_$1; [ $FLAG -eq $FLAGS_TRUE ]; }
noflag() { eval FLAG=\$FLAGS_$1; [ $FLAG -ne $FLAGS_TRUE ]; }

main "$@"