show plugin list if no arguments present closes #892

padrino-gen/lib/padrino-gen/generators/plugin.rb

@@ -36,7 +36,21 @@ def self.banner; "padrino-gen plugin [plugin_identifier] [options]"; end
       #
       # @api private
       def setup_plugin
-        if options[:list] # list method ran here
+        if options[:list] || plugin_file.nil? # list method ran here
+          list_plugins
+        else # executing the plugin instructions
+          if in_app_root?
+            self.behavior = :revoke if options[:destroy]
+            self.destination_root = options[:root]
+            execute_runner(:plugin, plugin_file)
+          else
+            say "You are not at the root of a Padrino application! (config/boot.rb not found)"
+          end
+        end
+      end
+
+      no_tasks do
+        def list_plugins
           plugins = {}
           uri = URI.parse(PLUGIN_URL)
           http = Net::HTTP.new(uri.host, uri.port)
@@ -49,14 +63,6 @@ def setup_plugin
           end
           say "Available plugins:", :green
           say plugins.map { |plugin| "  - #{plugin}" }.join("\n")
-        else # executing the plugin instructions
-          if in_app_root?
-            self.behavior = :revoke if options[:destroy]
-            self.destination_root = options[:root]
-            execute_runner(:plugin, plugin_file)
-          else
-            say "You are not at the root of a Padrino application! (config/boot.rb not found)"
-          end
         end
       end
     end # Plugins

padrino-gen/test/test_plugin_generator.rb

@@ -82,6 +82,20 @@ def teardown
     end
   end
 
+  context "with list option" do
+    should "return a list of available plugins with no parameter" do
+      plugin_gen = Padrino::Generators::Plugin.new([], [],{})
+      plugin_gen.expects(:list_plugins).returns(true).once
+      capture_io { plugin_gen.invoke_all }
+    end
+
+    should "return a list of available plugins with list option" do
+      plugin_gen = Padrino::Generators::Plugin.new(['some_plugin'], ["-l", "-r=#{@apptmp}/sample_project"],{})
+      plugin_gen.expects(:list_plugins).returns(true).once
+      capture_io { plugin_gen.invoke_all }
+    end
+  end
+
   context "with git commands" do
     should "generate a repository correctly" do
       skip 'Change stubs here'