#!/usr/bin/env bash

test $# -eq 0 && echo "branch argument required." 1>&2 && exit 1

# preference takes lowest priority; look for remote from prefs first
REMOTE_PREF=`git config git-extras.create-branch.remote`
if [ -n "$REMOTE_PREF" ]; then
	REMOTE=$REMOTE_PREF
fi

while test $# != 0
do
	case $1 in
		-r|--remote)
			if [[ -n $2 ]]
			then
				REMOTE=$2
				shift
			else
				REMOTE=origin
			fi
			;;
		*)
			BRANCH=$1
	esac
	shift
done

# handle ambiguous `-r` option argument by shift
if [[ -z $BRANCH ]] && [[ -n $REMOTE ]]
then
	BRANCH=$REMOTE
	REMOTE=origin
fi

test -z $BRANCH && echo "branch argument required." 1>&2 && exit 1

if [[ -n $REMOTE ]]
then
	git ls-remote --exit-code $REMOTE 1>/dev/null 2>/tmp/ls-remote-error
	REMOTE_EXIT=$?
	REMOTE_ERROR=$(</tmp/ls-remote-error)
	rm -f /tmp/ls-remote-error
	if [ $REMOTE_EXIT -eq 0 ]
	then
		git push $REMOTE HEAD:refs/heads/$BRANCH
		git fetch $REMOTE
		git checkout --track -b $BRANCH $REMOTE/$BRANCH
		exit $?
	else
		echo
		echo "    Error connecting to remote '$REMOTE': $REMOTE_ERROR"
		echo
		exit $REMOTE_EXIT
	fi
fi

git checkout -b $BRANCH