Interactive way to delete Git branches

gbd

#!/bin/bash

interactive=0
manual=0
list=0
branches=()
response=""
shouldDelete=0

function usage() {
	echo ""
	echo "useage: gbd [-b <branch_name>]"
	echo "            [--branch <branch_name>]"
	echo "            [-i] [--interactive]"
	echo "            [-m] [--manual]"
	echo "            [-l] [--list]"
	echo "            [-h] [--help]"
	echo ""
	echo "    -b --branch:"
	echo "        Input as many branches this way as you want."
	echo ""
	echo "    Manual Mode:"
	echo "        Input each branch name, one at a time"
	echo "        entering nothing to end the input"
	echo ""
	echo "    List Mode:"
	echo "        List all branches and ask about each one."
	echo ""
	echo ""
}

function get_branch() {
	echo -n "Enter name of the branch to delete (nothing to stop)> "
	read response
	if [ -n "$response" ]; then
		branches+=($response)
	fi
}

function manual_entry() {
	get_branch
	while [[ "$response" != "" ]]; do
		get_branch
	done
}

function list_branches() {
	tempBranches=()
	eval "$(git for-each-ref --shell --format='tempBranches+=(%(refname))' refs/heads/)"
	for branch in "${tempBranches[@]}"; do
		branch=${branch:11}
		echo -n "Delete $branch? (y/n) > "
		read response
		if [ "$response" == "y" ]; then
			branches+=($branch)
		fi
	done
}

function interactive() {
	echo -n "List or Manual? (l/m) > "
	read response
	if [ "$response" == "l" ]; then
		list_branches
	elif [ "$response" == "m" ]; then
		manual_entry
	fi
}

function delete_branches() {
	for branch in "${branches[@]}"; do
		output="$(git branch -d $branch 2>&1)"
		if [ "$?" == "1" ]; then
			echo "$branch is not fully merged."
			echo -n "Are you sure you want to delete it? (y/n) > "
			read response
			if [ "$response" == "y" ]; then
				echo "$(git branch -D $branch)"
			fi
		else
			echo $output
		fi
	done
}


#### MAIN

while [ "$1" != "" ]; do
	case $1 in
		-b | --branch )         shift
		                        branches+=($1)
		                        shouldDelete=1
		                        ;;
		-i | --interactive )    interactive=1
		                        shouldDelete=1
		                        ;;
		-m | --manual )         manual=1
		                        shouldDelete=1
		                        ;;
		-l | --list )           list=1
		                        shouldDelete=1
		                        ;;
		-h | --help )           usage
		                        exit
		                        ;;
	esac
	shift
done

if [ "$interactive" = "1" ]; then
	interactive
elif [ "$manual" = "1" ]; then
	manual_entry
elif [ "$list" = "1" ]; then
	list_branches
elif [ "$shouldDelete" = "0" ]; then
	usage
fi

if [ "$shouldDelete" = "1" ]; then
	delete_branches
fi