Add experimental support for updating markdown links on copy/paste (#209319)

* Add experimental support for updating markdown links on copy/paste

For #209318

* Remove log

extensions/markdown-language-features/src/languageFeatures/updateLinksOnPaste.ts

@@ -0,0 +1,81 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as vscode from 'vscode';
+import { MdLanguageClient } from '../client/client';
+import { Mime } from '../util/mimes';
+
+class UpdatePastedLinksEditProvider implements vscode.DocumentPasteEditProvider {
+
+	public static readonly kind = vscode.DocumentPasteEditKind.Empty.append('text', 'markdown', 'updateLinks');
+
+	public static readonly metadataMime = 'vnd.vscode.markdown.updateLinksMetadata';
+
+	constructor(
+		private readonly _client: MdLanguageClient,
+	) { }
+
+	async prepareDocumentPaste(document: vscode.TextDocument, ranges: readonly vscode.Range[], dataTransfer: vscode.DataTransfer, token: vscode.CancellationToken): Promise<void> {
+		if (!this._isEnabled(document)) {
+			return;
+		}
+
+		const metadata = await this._client.prepareUpdatePastedLinks(document.uri, ranges, token);
+		if (token.isCancellationRequested) {
+			return;
+		}
+		dataTransfer.set(UpdatePastedLinksEditProvider.metadataMime, new vscode.DataTransferItem(metadata));
+	}
+
+	async provideDocumentPasteEdits(
+		document: vscode.TextDocument,
+		ranges: readonly vscode.Range[],
+		dataTransfer: vscode.DataTransfer,
+		_context: vscode.DocumentPasteEditContext,
+		token: vscode.CancellationToken,
+	): Promise<vscode.DocumentPasteEdit[] | undefined> {
+		if (!this._isEnabled(document)) {
+			return;
+		}
+
+		const metadata = dataTransfer.get(UpdatePastedLinksEditProvider.metadataMime)?.value;
+		if (!metadata) {
+			return;
+		}
+
+		const textItem = dataTransfer.get(Mime.textPlain);
+		const text = await textItem?.asString();
+		if (!text || token.isCancellationRequested) {
+			return;
+		}
+
+		// TODO: Handle cases such as:
+		// - copy empty line
+		// - Copy with multiple cursors and paste into multiple locations
+		// - ...
+		const edits = await this._client.getUpdatePastedLinksEdit(document.uri, ranges.map(x => new vscode.TextEdit(x, text)), metadata, token);
+		if (!edits || !edits.length || token.isCancellationRequested) {
+			return;
+		}
+
+		const pasteEdit = new vscode.DocumentPasteEdit('', vscode.l10n.t("Paste and update pasted links"), UpdatePastedLinksEditProvider.kind);
+		const workspaceEdit = new vscode.WorkspaceEdit();
+		workspaceEdit.set(document.uri, edits.map(x => new vscode.TextEdit(new vscode.Range(x.range.start.line, x.range.start.character, x.range.end.line, x.range.end.character,), x.newText)));
+		pasteEdit.additionalEdit = workspaceEdit;
+		return [pasteEdit];
+	}
+
+	private _isEnabled(document: vscode.TextDocument): boolean {
+		return vscode.workspace.getConfiguration('markdown', document.uri).get<boolean>('experimental.updateLinksOnPaste', false);
+	}
+}
+
+export function registerUpdatePastedLinks(selector: vscode.DocumentSelector, client: MdLanguageClient) {
+	return vscode.languages.registerDocumentPasteEditProvider(selector, new UpdatePastedLinksEditProvider(client), {
+		copyMimeTypes: [UpdatePastedLinksEditProvider.metadataMime],
+		providedPasteEditKinds: [UpdatePastedLinksEditProvider.kind],
+		pasteMimeTypes: [UpdatePastedLinksEditProvider.metadataMime],
+	});
+}