Git commit hook to always append the ticket number of the current branch when making a commit.

commit-msg

#!/bin/bash

# Get the current branch name
branch=$(git symbolic-ref --short HEAD)

# Extract the ticket number from the branch name e.g. feature/AB-123
# This regex assumes that the ticket number is always preceded by a '/'
ticket_number=$(echo $branch | sed -n 's/.*\/\([A-Z]*-[0-9]*\)/\1/p')

# If a ticket number was found, append it to the commit message
if [[ ! -z $ticket_number ]]; then
  echo -e "\n$ticket_number" >> $1
fi