A *commit-msg git hook* where I ask to enter the issue number, the Github usernames and then the description of the commit.

commit-msg.rb

#!/usr/bin/env ruby

# Github usernames may only contain alphanumeric characters
# or dashes and cannot begin with a dash
$regex = /^(?:(?:fixes|closes|resolves)\s)?#\d+\s\[@[a-z0-9][a-z0-9\-]*(?:,\s@[a-z0-9][a-z0-9\-]*)*\]\s(?:\w+[\.\,]?\s)+/i

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

if !$regex.match(message)
  puts '[POLICY]'
  puts '* Your message is not formatted correctly'
  puts '* It should follow the pattern:'
  puts '* #<issue number> [<github usernames>] commit description'
  exit 1
end