Prepend branch name to every git commit message unless on master.

prepare-commit-msg

#!/bin/sh
#
# Prepend the branch name to the commit message
# 
# Add this file as [repo]/.git/hooks/prepare-commit-msg 
#
# A couple notes:
# 1. The file must be executable (chmod +x prepare-commit-msg)
# 2. This works on a per-repo basis (unless you follow this guide https://coderwall.com/p/jp7d5q/create-a-global-git-commit-hook)

BRANCH_NAME=$(git symbolic-ref --short HEAD) 
if [ -n "$BRANCH_NAME" ] && [ "$BRANCH_NAME" != "master" ]; then
	sed -i.bak -e "1s/^/$BRANCH_NAME - /" $1
fi