# File lib/nanoc3/cli/commands/create_layout.rb, line 37
    def run(options, arguments)
      # Check arguments
      if arguments.length != 1
        $stderr.puts "usage: #{usage}"
        exit 1
      end

      # Extract arguments
      identifier = arguments[0].cleaned_identifier

      # Make sure we are in a nanoc site directory
      @base.require_site
      @base.site.load_data

      # Set VCS if possible
      @base.set_vcs(options[:vcs])

      # Check whether layout is unique
      if !@base.site.layouts.find { |l| l.identifier == identifier }.nil?
        $stderr.puts "A layout already exists at #{identifier}. Please " +
                     "pick a unique name for the layout you are creating."
        exit 1
      end

      # Check whether layout is not at /
      if identifier == '/'
        $stderr.puts "There cannot be a layout with the identifier '/'; " +
                     "please pick a different identifier for this layout."
        exit 1
      end

      # Setup notifications
      Nanoc3::NotificationCenter.on(:file_created) do |file_path|
        Nanoc3::CLI::Logger.instance.file(:high, :create, file_path)
      end

      # Create layout
      data_source = @base.site.data_sources[0]
      data_source.create_layout(
        "<html>\n" +
        "  <head>\n" +
        "    <title><%= @item[:title] %></title>\n" +
        "  </head>\n" +
        "  <body>\n" +
        "    <p>Hi, I'm a new layout. Please customize me!</p>\n" +
        "<%= yield %>\n" +
        "  </body>\n" +
        "</html>\n",
        {},
        identifier
      )

      puts "A layout has been created at #{identifier}."
    end