#!/usr/bin/env ruby

def check_ruby_file(adds)
  adds.select{|add|
    /;\z/.match? add
  }.any? ? 'm9' : 'ok'
end

def check_adds(filename, adds)
  if /\.rb\z/.match? filename
    check_ruby_file(adds)
  else
    'ok'
  end
end

changed_files = `git diff --cached --name-only HEAD`
exit_code = changed_files.split("\n").
  map{|filename| [filename, `git diff --cached -U0 HEAD -- "#{filename}"`] }.
  map{|(filename, diffs)| [filename, diffs.split(/\n/).select{|diff| /\A\+[^\+]/.match?(diff)} ] }.
  reject{|(_, adds)| adds.empty? }.
  map{|(filename, adds)| [filename, adds, check_adds(filename, adds)] }.
  reject{|(_, _, result)| result == "ok" }.
  tap{|elemeht| elemeht.each{|(filename, adds, result)| puts "Your commit have invalid adds. #{filename}"; puts "#{adds.join("\n")}" } }
  .any? ? 1 : 0

exit exit_code