.prepare-commit-msg

#!/bin/sh

# Put this file in .git/hooks/prepare-commit-msg
# This script prepares the commit message by inserting
# [PROJECT_NAME] (BRANCH) at the top of the message.
# PROJECT_NAME is your own environment variable,
# you can set it like this:
# $ export PROJECT_NAME=MY_PROJECT_NAME
# or don't set it, you'll just have empty brackets.
# Then you just have to write the commit message.

current_branch()
{
    ref=$(git rev-parse --abbrev-ref HEAD 2> /dev/null) \
        || return
    echo $ref
}

# If $2 is empty, prepare the commit message.
# See what are the values of $2 there:
# http://git-scm.com/docs/githooks#_prepare_commit_msg
# Useful for leaving the commit message untouched on a merge.
if [ -z "$2" ]
then
    BRANCH=$(current_branch)
    TIME=$(date +%s)
    TEMPORARY_COMMIT_FILE="/tmp/temporary_commit_file.$TIME"

    echo "[$PROJECT_NAME] ($BRANCH)" | cat - "$1" > $TEMPORARY_COMMIT_FILE
    mv $TEMPORARY_COMMIT_FILE "$1"
fi