Automatically generate git commit message from the branch name (angular convention)

prepare-commit-msg.sh

#!/bin/bash

# Assesses your branch naming follow Angular's commit message format (https://github.com/angular/angular.js/blob/master/DEVELOPERS.md#commits)

# Global Setup
# - create a `~/.git/hooks` folder
# - create the `prepare-commit-msg` hook file in this folder and paste this script
# - make git use this folder `git config --global core.hooksPath ~/.git/hooks`
# - allow for emtpy commit message `git config --global alias.commit "commit --allow-empty"`

# Usage
# run `git commit` when you want to create commit, edit the commit message at your liking and save

# This way you can customize which branches should be skipped when
# prepending commit message.
if [ -z "$BRANCHES_TO_SKIP" ]; then
  BRANCHES_TO_SKIP=(master)
fi

BRANCH_NAME=$(git symbolic-ref --short HEAD)

COMMIT_MSG=$BRANCH_NAME
# replace first "/" with ": "
COMMIT_MSG=`echo ${COMMIT_MSG} | sed -e "s/\//: /"`
# replace "-" with " "
COMMIT_MSG=`echo ${COMMIT_MSG} | sed -e "s/-/ /g"`

BRANCH_EXCLUDED=$(printf "%s\n" "${BRANCHES_TO_SKIP[@]}" | grep -c "^$BRANCH_NAME$")

if [ -n "$BRANCH_NAME" ] && ! [[ $BRANCH_EXCLUDED -eq 1 ]]; then
  sed -i.bak -e "1s/^/$COMMIT_MSG/" $1
fi

TODO: check that the branch name matches the format.

Add to the doc : chmod +x ~/.git/hooks/prepare-commit-msg