Prepend commit message with Jira ticket number from the current branch

prepare-commit-msg

#!/bin/sh

# Put this file in .git/hooks/ to prepend all commit messages with the 
# Jira ticket number found in the current branch name

# modified from https://community.atlassian.com/t5/Bitbucket-questions/automatically-append-JIRA-issue-ID-into-commit-message/qaq-p/605991#M24736


# get current branch
branchName=`git rev-parse --abbrev-ref HEAD`

# search jira issue id in a pattern such a "feature/ABC-123-description"
jiraId=$(echo $branchName | sed -nr 's,[a-z]+/([A-Z]+-[0-9]+)-.+,\1,p')

# only prepare commit message if pattern matched and jiraId was found
if [[ ! -z $jiraId ]]; then
 # $1 is the name of the file containing the commit message
 sed -i.bak -e "s/^/\[$jiraId\] /" $1
fi