Add document drop handler and telemetry

ext/vscode/.vscode/cspell-dictionary.txt

@@ -7,3 +7,6 @@ azureresources
 walkthrough
 walkthroughs
 DEBUGTELEMETRY
+appservice
+containerapp
+staticwebapp

ext/vscode/src/language/AzureYamlDocumentDropEditProvider.ts

@@ -0,0 +1,34 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+import { AzExtFsExtra } from '@microsoft/vscode-azext-utils';
+import * as path from 'path';
+import * as vscode from 'vscode';
+import { getProjectRelativePath } from './azureYamlUtils';
+
+export class AzureYamlDocumentDropEditProvider implements vscode.DocumentDropEditProvider {
+    public async provideDocumentDropEdits(document: vscode.TextDocument, position: vscode.Position, dataTransfer: vscode.DataTransfer, token: vscode.CancellationToken): Promise<vscode.DocumentDropEdit | undefined> {
+        const maybeFolder = dataTransfer.get('text/uri-list')?.value;
+        const maybeFolderUri = vscode.Uri.parse(maybeFolder);
+
+        if (await AzExtFsExtra.pathExists(maybeFolderUri) && await AzExtFsExtra.isDirectory(maybeFolderUri)) {
+            const basename = path.basename(maybeFolderUri.fsPath);
+            const newRelativePath = getProjectRelativePath(document.uri, maybeFolderUri);
+
+            const initialWhitespace = position.character === 0 ? '\n\t' : '\n';
+
+            const snippet = new vscode.SnippetString(initialWhitespace)
+                .appendPlaceholder(basename).appendText(':\n')
+                .appendText(`\t\tproject: ${newRelativePath}\n`)
+                .appendText('\t\tlanguage: ')
+                .appendChoice(['dotnet', 'csharp', 'fsharp', 'py', 'python', 'js', 'ts', 'java'])
+                .appendText('\n')
+                .appendText('\t\thost: ')
+                .appendChoice(['appservice', 'containerapp', 'function', 'staticwebapp', 'aks'])
+                .appendText('\n');
+            return new vscode.DocumentDropEdit(snippet);
+        }
+
+        return undefined;
+    }
+}

ext/vscode/src/language/languageFeatures.ts

@@ -5,6 +5,7 @@ import * as vscode from 'vscode';
 import ext from '../ext';
 import { AzureYamlDiagnosticProvider } from './AzureYamlDiagnosticProvider';
 import { AzureYamlProjectRenameProvider } from './AzureYamlProjectRenameProvider';
+import { AzureYamlDocumentDropEditProvider } from './AzureYamlDocumentDropEditProvider';
 
 export const AzureYamlSelector: vscode.DocumentSelector = { language: 'yaml', scheme: 'file', pattern: '**/azure.{yml,yaml}' };
 
@@ -16,4 +17,8 @@ export function registerLanguageFeatures(): void {
     ext.context.subscriptions.push(
         new AzureYamlProjectRenameProvider()
     );
+
+    ext.context.subscriptions.push(
+        vscode.languages.registerDocumentDropEditProvider(AzureYamlSelector, new AzureYamlDocumentDropEditProvider())
+    );
 }