Takes the ticket prefix from the branch name and adds it to the commit message

prepare-commit-message

#!/usr/bin/env ruby

BRANCHES_TO_SKIP = ['master', 'develop'].freeze
# Grabs 1-4 letters, a dash and 1-4 numbers after a leading slash.
# For example, with the string 'feature/DOT-38-update-gems' it would match 'DOT-38'
PREFIX_REGEX = /(?<=\/)[a-zA-Z]{1,4}-\d{1,4}/.freeze

message_file = ARGV[0]

branch_name = `git symbolic-ref --short HEAD`.strip

return if BRANCHES_TO_SKIP.include?(branch_name)
return unless branch_name =~ PREFIX_REGEX

jira_ticket_prefix = branch_name.scan(PREFIX_REGEX).first

message_text = File.read(message_file)

return if message_text.include?(jira_ticket_prefix)

new_message_text = [jira_ticket_prefix, ': ', message_text].join

File.write(message_file, new_message_text)