#!/usr/bin/env sh

function current_branch() {
  local ref
  ref=$(git symbolic-ref --quiet HEAD 2> /dev/null)
  local ret=$?
  if [[ $ret != 0 ]]; then
    [[ $ret == 128 ]] && return  # no git repo.
    ref=$(git rev-parse --short HEAD 2> /dev/null) || return
  fi
  echo ${ref#refs/heads/}
}

current_branch