commit-msg hook to ensure we're adding the Pivotal Tracker story id

commit-msg

#!/usr/bin/env ruby

# This is a git hook that checks commit messages for validity
# This file must live in your project's .git/hooks/ folder
# and have execution permission

message_file = ARGV[0]
message = File.read(message_file)

def valid_commit_message?(message)
  lines = message.lines.map(&:chomp)

  line_is_not_empty?(lines.shift) &&
  line_is_empty?(lines.shift) &&
  lines_contain_link_to_trello?(lines)
end

def line_is_empty?(line)
  line && line.empty?
end

def line_is_not_empty?(line)
  line && !line.empty?
end

def lines_contain_link_to_trello?(lines)
  regex = %r{https://trello\.com/c/(\w+)(?:\/[\w\-]+)?|\W#(\w+)}
  lines.any? { |line| regex.match(line) }
end

unless valid_commit_message? message
  puts "Did you forget to reference the Trello card this commit refers to?"
  puts "More info: https://gist.github.com/ciscou/8d755a68d0ddc7dc7895"
  puts "If you have a very good reason not to add a Trello card link, use --no-verify"
  exit 1
end