gitmacros/git-find-branch at develop · lingo/gitmacros · GitHub

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#!/bin/bash

getBranch() {
	local ref=$(git name-rev --refs=refs/heads/\* "$@" | cut -d' ' -f2 )

	if [[ -n "$ref" || "$ref" == "undefined" ]]; then
		echo $(git name-rev "$@" | cut -d' ' -f2)
		return 1
	else
		echo $ref
		return 0
	fi
}

if [[ $# -eq 0 ]]; then
	getBranch HEAD
else
	getBranch "$@"
fi