# File lib/nanoc/cli/commands/show-plugins.rb, line 16
    def run
      # Check arguments
      if arguments.size != 0
        raise Nanoc::Errors::GenericTrivial, "usage: #{command.usage}"
      end

      # Get list of plugins (before and after)
      plugins_before = Nanoc::Plugin.all
      self.site.code_snippets if self.site
      plugins_after  = Nanoc::Plugin.all

      # Divide list of plugins into builtin and custom
      plugins_builtin = plugins_before
      plugins_custom  = plugins_after - plugins_before

      # Find max identifiers length
      plugin_with_longest_identifiers = plugins_after.inject do |longest, current|
        longest[:identifiers].join(', ').size > current[:identifiers].join(', ').size ? longest : current
      end
      max_identifiers_length = plugin_with_longest_identifiers[:identifiers].join(', ').size

      PLUGIN_CLASS_ORDER.each do |superclass|
        plugins_with_this_superclass = {
          :builtin => plugins_builtin.select { |p| p[:superclass] == superclass },
          :custom  => plugins_custom.select  { |p| p[:superclass] == superclass }
        }

        # Print kind
        kind = name_for_plugin_class(superclass)
        puts "#{kind}:"
        puts

        # Print plugins organised by subtype
        [ :builtin, :custom ].each do |type|
          # Find relevant plugins
          relevant_plugins = plugins_with_this_superclass[type]

          # Print type
          puts "  #{type}:"
          if relevant_plugins.empty?
            puts "    (none)"
            next
          end

          # Print plugins
          relevant_plugins.sort_by { |k| k[:identifiers].join(', ') }.each do |plugin|
            # Display
            puts sprintf(
              "    %-#{max_identifiers_length}s (%s)",
              plugin[:identifiers].join(', '),
              plugin[:class].to_s.sub(/^::/, '')
            )
          end
        end

        puts
      end
    end