(chocolateyGH-132) Change ChocolateySourceCommand to an IListCommand

In order to make commands support listing, add a new command interface
 the IListCommand interface is an ICommand with an extra method "list"

src/chocolatey.tests/infrastructure.app/commands/ChocolateySourceCommandSpecs.cs

@@ -355,7 +355,7 @@ public void should_call_service_source_add_when_command_is_add()
                 because();
                 configSettingsService.Verify(c => c.source_add(configuration), Times.Once);
             }
-
+		
             [Fact]
             public void should_call_service_source_remove_when_command_is_remove()
             {
@@ -380,5 +380,23 @@ public void should_call_service_source_enable_when_command_is_enable()
                 configSettingsService.Verify(c => c.source_enable(configuration), Times.Once);
             }
         }
+
+        public class when_list_is_called : ChocolateySourceCommandSpecsBase
+        {
+            private Action because;
+
+            public override void Because()
+            {
+                because = () => command.list(configuration);
+            }
+
+            [Fact]
+            public void should_call_service_source_list_when_command_is_list()
+            {
+                configuration.SourceCommand.Command = SourceCommandType.list;
+                because();
+                configSettingsService.Verify(c => c.source_list(configuration), Times.Once);
+            }
+        }
     }
 }

src/chocolatey/chocolatey.csproj

@@ -161,6 +161,7 @@
     <Compile Include="infrastructure\commandline\ExitScenarioHandler.cs" />
     <Compile Include="infrastructure\commandline\InteractivePrompt.cs" />
     <Compile Include="infrastructure\commands\ICommandExecutor.cs" />
+    <Compile Include="infrastructure\commands\IListCommand.cs" />
     <Compile Include="infrastructure\commands\PowershellExecutor.cs" />
     <Compile Include="infrastructure\guards\Ensure.cs" />
     <Compile Include="infrastructure\information\ProcessInformation.cs" />

src/chocolatey/infrastructure.app/commands/ChocolateySourceCommand.cs

@@ -28,7 +28,7 @@ namespace chocolatey.infrastructure.app.commands
 
     [CommandFor(CommandNameType.sources)]
     [CommandFor(CommandNameType.source)]
-    public sealed class ChocolateySourceCommand : ICommand
+    public sealed class ChocolateySourceCommand : IListCommand<ChocolateySource>
     {
         private readonly IChocolateyConfigSettingsService _configSettingsService;
 
@@ -139,5 +139,10 @@ public void run(ChocolateyConfiguration configuration)
                     break;
             }
         }
+
+        public IEnumerable<ChocolateySource> list(ChocolateyConfiguration configuration)
+        {
+            return _configSettingsService.source_list(configuration);
+        }
     }
-}
+}

src/chocolatey/infrastructure/commands/IListCommand.cs

@@ -0,0 +1,25 @@
+// Copyright © 2015 - Present RealDimensions Software, LLC
+// 
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// 
+// You may obtain a copy of the License at
+// 
+// 	http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+namespace chocolatey.infrastructure.commands
+{
+    using System.Collections.Generic;
+    using app.configuration;
+
+    public interface IListCommand<out T> : ICommand
+    {
+        IEnumerable<T> list(ChocolateyConfiguration config);
+    }
+}