fetchout subcommand for git that fetches and checks out the new branch

git-fetchout

#!/bin/bash

get_branches() {
	git branch -r | tail -n +2 | sed "s|^[^/]*/||" | sort
}

branches_were=$(get_branches)
git fetch
branches_are=$(get_branches)

mapfile -t choices < <(diff --old-line-format="" --unchanged-line-format="" <(echo "$branches_were") <(echo "$branches_are"))

if [ ${#choices[@]} -eq 1 ]
then
	git checkout "${choices[0]}"
	exit 0
elif (( ${#choices[@]} ))
then
	echo
	select branch in "${choices[@]}"
	do
		git checkout "$branch"
		exit 0
	done
fi