Initial VS Code 1.19 source merge (#571)

* Initial 1.19 xcopy

* Fix yarn build

* Fix numerous build breaks

* Next batch of build break fixes

* More build break fixes

* Runtime breaks

* Additional post merge fixes

* Fix windows setup file

* Fix test failures.

* Update license header blocks to refer to source eula

extensions/markdown/src/markdownExtensions.ts

@@ -0,0 +1,86 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as vscode from 'vscode';
+import * as path from 'path';
+
+import { MDDocumentContentProvider } from './features/previewContentProvider';
+import { MarkdownEngine } from './markdownEngine';
+
+const resolveExtensionResources = (extension: vscode.Extension<any>, stylePath: string): vscode.Uri => {
+	const resource = vscode.Uri.parse(stylePath);
+	if (resource.scheme) {
+		return resource;
+	}
+	return vscode.Uri.file(path.join(extension.extensionPath, stylePath));
+};
+
+
+export function loadMarkdownExtensions(
+	contentProvider: MDDocumentContentProvider,
+	engine: MarkdownEngine
+) {
+	for (const extension of vscode.extensions.all) {
+		const contributes = extension.packageJSON && extension.packageJSON.contributes;
+		if (!contributes) {
+			continue;
+		}
+
+		tryLoadPreviewStyles(contributes, contentProvider, extension);
+		tryLoadPreviewScripts(contributes, contentProvider, extension);
+		tryLoadMarkdownItPlugins(contributes, extension, engine);
+	}
+}
+
+function tryLoadMarkdownItPlugins(
+	contributes: any,
+	extension: vscode.Extension<any>,
+	engine: MarkdownEngine
+) {
+	if (contributes['markdown.markdownItPlugins']) {
+		extension.activate().then(() => {
+			if (extension.exports && extension.exports.extendMarkdownIt) {
+				engine.addPlugin((md: any) => extension.exports.extendMarkdownIt(md));
+			}
+		});
+	}
+}
+
+function tryLoadPreviewScripts(
+	contributes: any,
+	contentProvider: MDDocumentContentProvider,
+	extension: vscode.Extension<any>
+) {
+	const scripts = contributes['markdown.previewScripts'];
+	if (scripts && Array.isArray(scripts)) {
+		for (const script of scripts) {
+			try {
+				contentProvider.addScript(resolveExtensionResources(extension, script));
+			}
+			catch (e) {
+				// noop
+			}
+		}
+	}
+}
+
+function tryLoadPreviewStyles(
+	contributes: any,
+	contentProvider: MDDocumentContentProvider,
+	extension: vscode.Extension<any>
+) {
+	const styles = contributes['markdown.previewStyles'];
+	if (styles && Array.isArray(styles)) {
+		for (const style of styles) {
+			try {
+				contentProvider.addStyle(resolveExtensionResources(extension, style));
+			}
+			catch (e) {
+				// noop
+			}
+		}
+	}
+}
+