prepare-commit-msg git hook that adds the branch name to the end of the commit message

prepare-commit-msg

#!/bin/sh
#
# This hook will append the current branch name to
# the commit message if it's not already there.

ref=$(git symbolic-ref HEAD 2> /dev/null)
branch=${ref#refs/heads/}

if [[ "$branch" != "master" ]]; then
    grep -qa "$branch" "$1" || echo "\n[Branch: $branch]" >> "$1"
fi