Add a command for quickly creating a new extension

src/modules/cmdpal/ExtensionTemplate/TemplateCmdPalExtension/nuget.config

@@ -3,14 +3,10 @@
 	<packageSources>
 		<clear />
 		<add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
-		<add key="SDKLocalSource" value=".\deps\Microsoft.CommandPalette.Extensions" />
 	</packageSources>
 	<packageSourceMapping>
 		<packageSource key="nuget.org">
 			<package pattern="*" />
 		</packageSource>
-		<packageSource key="SDKLocalSource">
-			<package pattern="Microsoft.CommandPalette.Extensions" />
-		</packageSource>
 	</packageSourceMapping>
 </configuration>

src/modules/cmdpal/exts/Microsoft.CmdPal.Ext.WinGet/ExtensionHostInstance.cs → src/modules/cmdpal/Microsoft.CmdPal.Common/Helpers/ExtensionHostInstance.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Corporation
+// Copyright (c) Microsoft Corporation
 // The Microsoft Corporation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
@@ -7,7 +7,7 @@
 using Microsoft.CommandPalette.Extensions;
 using Microsoft.CommandPalette.Extensions.Toolkit;
 
-namespace Microsoft.CmdPal.Ext.WinGet;
+namespace Microsoft.CmdPal.Common;
 
 public partial class ExtensionHostInstance
 {

src/modules/cmdpal/Microsoft.CmdPal.UI.ViewModels/Commands/BuiltInsCommandProvider.cs

@@ -2,7 +2,6 @@
 // The Microsoft Corporation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-using Microsoft.CmdPal.UI.ViewModels.Commands;
 using Microsoft.CmdPal.UI.ViewModels.Messages;
 using Microsoft.CommandPalette.Extensions;
 using Microsoft.CommandPalette.Extensions.Toolkit;
@@ -18,10 +17,12 @@ public partial class BuiltInsCommandProvider : CommandProvider
     private readonly QuitCommand quitCommand = new();
     private readonly FallbackReloadItem _fallbackReloadItem = new();
     private readonly FallbackLogItem _fallbackLogItem = new();
+    private readonly NewExtensionPage _newExtension = new();
 
     public override ICommandItem[] TopLevelCommands() =>
         [
             new CommandItem(openSettings) { Subtitle = "Open Command Palette settings" },
+            new CommandItem(_newExtension) { Title = _newExtension.Title, Subtitle = "Creates a project for a new Command Palette extension" },
         ];
 
     public override IFallbackCommandItem[] FallbackCommands() =>
@@ -37,4 +38,6 @@ public BuiltInsCommandProvider()
         DisplayName = "Built-in commands";
         Icon = IconHelpers.FromRelativePath("Assets\\StoreLogo.scale-200.png");
     }
+
+    public override void InitializeWithHost(IExtensionHost host) => BuiltinsExtensionHost.Instance.Initialize(host);
 }

src/modules/cmdpal/Microsoft.CmdPal.UI.ViewModels/Commands/BuiltinsExtensionHost.cs

@@ -0,0 +1,20 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Diagnostics.CodeAnalysis;
+using System.IO.Compression;
+using System.Text.Json;
+using System.Text.Json.Nodes;
+using Microsoft.CmdPal.Common;
+using Microsoft.CmdPal.UI.ViewModels.Messages;
+using Microsoft.CommandPalette.Extensions;
+using Microsoft.CommandPalette.Extensions.Toolkit;
+using Windows.Foundation;
+
+namespace Microsoft.CmdPal.UI.ViewModels.BuiltinCommands;
+
+public partial class BuiltinsExtensionHost
+{
+    internal static ExtensionHostInstance Instance { get; } = new();
+}

src/modules/cmdpal/Microsoft.CmdPal.UI.ViewModels/Commands/CreatedExtensionForm.cs

@@ -0,0 +1,148 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Diagnostics.CodeAnalysis;
+using System.IO.Compression;
+using System.Text.Json;
+using System.Text.Json.Nodes;
+using Microsoft.CmdPal.UI.ViewModels.Messages;
+using Microsoft.CommandPalette.Extensions;
+using Microsoft.CommandPalette.Extensions.Toolkit;
+using Windows.Foundation;
+
+namespace Microsoft.CmdPal.UI.ViewModels.BuiltinCommands;
+
+internal sealed partial class CreatedExtensionForm : NewExtensionFormBase
+{
+    public CreatedExtensionForm(string name, string displayName, string path)
+    {
+        TemplateJson = CardTemplate;
+        DataJson = $$"""
+{
+    "name": {{JsonSerializer.Serialize(name)}},
+    "directory": {{JsonSerializer.Serialize(path)}},
+    "displayName": {{JsonSerializer.Serialize(displayName)}}
+}
+""";
+        _name = name;
+        _displayName = displayName;
+        _path = path;
+    }
+
+    public override ICommandResult SubmitForm(string inputs, string data)
+    {
+        var dataInput = JsonNode.Parse(data)?.AsObject();
+        if (dataInput == null)
+        {
+            return CommandResult.KeepOpen();
+        }
+
+        var verb = dataInput["x"]?.AsValue()?.ToString() ?? string.Empty;
+        return verb switch
+        {
+            "sln" => OpenSolution(),
+            "dir" => OpenDirectory(),
+            "new" => CreateNew(),
+            _ => CommandResult.KeepOpen(),
+        };
+    }
+
+    private ICommandResult OpenSolution()
+    {
+        string[] parts = [_path, _name, $"{_name}.sln"];
+        var pathToSolution = Path.Combine(parts);
+        ShellHelpers.OpenInShell(pathToSolution);
+        return CommandResult.GoHome();
+    }
+
+    private ICommandResult OpenDirectory()
+    {
+        string[] parts = [_path, _name];
+        var pathToDir = Path.Combine(parts);
+        ShellHelpers.OpenInShell(pathToDir);
+        return CommandResult.GoHome();
+    }
+
+    private ICommandResult CreateNew()
+    {
+        RaiseFormSubmit(null);
+        return CommandResult.KeepOpen();
+    }
+
+    private static readonly string CardTemplate = """
+{
+    "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
+    "type": "AdaptiveCard",
+    "version": "1.6",
+    "body": [
+        {
+            "type": "TextBlock",
+            "text": "Successfully created your new extension!",
+            "size": "large",
+            "weight": "bolder",
+            "style": "heading",
+            "wrap": true
+        },
+        {
+            "type": "TextBlock",
+            "text": "Your new extension \"${displayName}\" was created in:",
+            "wrap": true
+        },
+        {
+            "type": "TextBlock",
+            "text": "${directory}",
+            "fontType": "monospace"
+        },
+        {
+            "type": "TextBlock",
+            "text": "Next steps",
+            "style": "heading",
+            "wrap": true
+        },
+        {
+            "type": "TextBlock",
+            "text": "Now that your extension project has been created, open the solution up in Visual Studio to start writing your extension code.",
+            "wrap": true
+        },
+        {
+            "type": "TextBlock",
+            "text": "Navigate to `${name}Page.cs` to start adding items to the list, or to `${name}CommandsProvider.cs` to add new commands.",
+            "wrap": true
+        },
+        {
+            "type": "TextBlock",
+            "text": "Once you're ready to test deploy the package locally with Visual Studio, then run the \"Reload\" command in the Command Palette to load your new extension.",
+            "wrap": true
+        }
+    ],
+    "actions": [
+        {
+            "type": "Action.Submit",
+            "title": "Open Solution",
+            "data": {
+                "x": "sln"
+            }
+        },
+        {
+            "type": "Action.Submit",
+            "title": "Open directory",
+            "data": {
+                "x": "dir"
+            }
+        },
+        {
+            "type": "Action.Submit",
+            "title": "Create another",
+            "data": {
+                "x": "new"
+            }
+        }
+    ]
+}
+""";
+
+    private readonly string _name;
+    private readonly string _displayName;
+    private readonly string _path;
+}