Add code actions sample

code-actions-sample/src/extension.ts

@@ -0,0 +1,57 @@
+/*---------------------------------------------------------
+ * Copyright (C) Microsoft Corporation. All rights reserved.
+ *--------------------------------------------------------*/
+
+import * as vscode from 'vscode';
+
+export function activate(context: vscode.ExtensionContext) {
+	context.subscriptions.push(
+		vscode.languages.registerCodeActionsProvider('markdown', new Emojizer(), {
+			providedCodeActionKinds: Emojizer.providedCodeActionKinds
+		}));
+}
+
+/**
+ * Provides code actions for converting :) to an smiley emoji.
+ */
+export class Emojizer implements vscode.CodeActionProvider {
+
+	public static readonly providedCodeActionKinds = [
+		vscode.CodeActionKind.QuickFix
+	];
+
+	public provideCodeActions(document: vscode.TextDocument, range: vscode.Range): vscode.CodeAction[] | undefined {
+		if (!this.isAtStartOfSmiley(document, range)) {
+			return;
+		}
+
+		const replaceWithSmileyCatFix = this.createFix(document, range, '😺');
+
+		const replaceWithSmileyFix = this.createFix(document, range, '😀');
+		// Marking a single fix as `preferred` means that users can apply it with a
+		// single keyboard shortcut using the `Auto Fix` command.
+		replaceWithSmileyFix.isPreferred = true;
+
+		const replaceWithSmileyHankyFix = this.createFix(document, range, '💩');
+
+		return [
+			replaceWithSmileyCatFix,
+			replaceWithSmileyFix,
+			replaceWithSmileyHankyFix
+		];
+	}
+
+	private isAtStartOfSmiley(document: vscode.TextDocument, range: vscode.Range) {
+		const start = range.start;
+		const line = document.lineAt(start.line);
+		return line.text[start.character] === ':' && line.text[start.character + 1] === ')';
+	}
+
+	private createFix(document: vscode.TextDocument, range: vscode.Range, emoji: string): vscode.CodeAction {
+		const fix = new vscode.CodeAction(`Convert to ${emoji}`, vscode.CodeActionKind.QuickFix);
+		fix.edit = new vscode.WorkspaceEdit();
+		fix.edit.replace(document.uri, new vscode.Range(range.start, range.start.translate(0, 2)), emoji);
+		return fix;
+	}
+}
+