commit-msg.rb

#!/usr/bin/env ruby

limit   = 2
key     = 'none'
message = File.read( ARGV[0] )
tokens  = message.split()
buckets = { 'what' => [], 'why' => [], key => [] }

tokens.each do |token|
    t = token.downcase
    if t == 'what:' or t == 'why:'
        key = t.chomp( ':' )
    else
        buckets[key].push( token )
    end
end

if buckets['what'].length < limit or buckets['why'].length < limit
    puts "[POLICY] Your message is not sufficiently meaningful"
    exit 1
end