git-branch

#!/usr/bin/env bash

###
### git-branch: Add convenience options to git-branch(1).
###

BASENAME="$(basename $0)"
ERR_NOTREPO="Not a Git repository."
ERR_NO_PREV_BRANCH="No previous branch found."

if [[ ! "$(git rev-parse --is-inside-work-tree)" ]] 2>/dev/null; then
	printf '%s\n' "$ERR_NOTREPO"

	exit 1
fi

ARGV=()

while [[ $# -gt 0 ]]; do
	case "$1" in
		-L|--last)
			$GIT check-ref-format --branch @{-1} 2>/dev/null

			if [[ $? -gt 0 ]]; then
				printf '%s: %s\n' "$BASENAME" "$ERR_NO_PREV_BRANCH"

				exit 1
			fi

			exit 0
		;;
		--local)
			shift

			ARGV+=("--list")
		;;
		*)
			ARGV+=("$1")

			shift
		;;
	esac
done

exec $GIT branch "${ARGV[@]}"