Script for Git Prepare Commit Message Hook - Attempts to prefix with JIRA issue number

prepare-commit-msg

#!/bin/bash

# Looks for a JIRA style ticket name in the branch name, and prefixes the
# commit message with the ticket, if found. 
#
# If you're using the `git commit -m` style commit command, the issue number
# will be prefixed without notice.
# 
# If you use the standard `git commit` command where you're sent to an editor,
# the issue number will appear as the default commit message in the editor.
# You'll then edit to add the remainder of commit message to complete the 
# commit, or delete the contents to abort the commit.

# Get the current branch name, convert to uppercase.
BRANCH_NAME=$(git symbolic-ref --short HEAD)
BRANCH_NAME=`echo "$BRANCH_NAME" | awk '{ print toupper($0) }'`

# Attempt to match a pattern in the branch name.
PATTERN='([A-Z]+-[0-9]+)'
if [[ $BRANCH_NAME =~ $PATTERN ]]; then
  TICKET_NAME=${BASH_REMATCH[1]}
else
  exit 0
fi

# Write the output file, if provided.
if [ ! -z "$1" ]; then
  sed -i.bak -e "1s/^/${TICKET_NAME}: /" "$1"
fi