class Updater
  @base   = "/Users/david/dev"
  @extlib = @base + "/contrib/extlib"
  @dm     = @base + "/contrib/dm"
  @merb   = @base + "/sources/merb"

  def self.start(force_install = false)
    @force_install = force_install
    update "extlib",       "#{@extlib}"
    update "do",           "#{@dm}/do"
    update "dm-core",      "#{@dm}/dm-core"
    update "dm-more",      "#{@dm}/dm-more"
    update "merb-core",    "#{@merb}/merb-core"
    update "merb-more",    "#{@merb}/merb-more"
    update "merb-plugins", "#{@merb}/merb-plugins"
    puts "\nDone."
  end

  private

  def self.update(name, directory)
    puts "\n===== Updating #{name} ====="
    Dir.chdir(directory)
    result = `git pull`
    if result =~ /fatal/i
      raise "Bad. Things. Happening."
    elsif @force_install
      puts "Installing even though already up-to-date"
      install
    elsif result =~ /up-to-date/i
      puts "Skipping install: already up-to-date"
    else
      ask_and_install
    end
  end

  def self.ask_and_install
    loop do
      puts "[i] install | [l] show log and install | [s] skip install"
      case readline
      when /^I/i
        install
        break
      when /^L/i
        git_log
        install
        break
      when /^S/i
        break
      else
        puts "Not recognized, please try again."
      end
    end
  end

  def self.git_log
    run "git log"
  end

  def self.install
    run "sudo rake install"
  end

  def self.run(command)
    unless system(command)
      puts "'#{command}' failed."
    end
  end

end

Updater.start