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src/vs/code/node/windowsFinder.ts

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+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+'use strict';
+
+import * as path from 'path';
+import * as fs from 'fs';
+import * as platform from 'vs/base/common/platform';
+import * as paths from 'vs/base/common/paths';
+import { OpenContext } from 'vs/platform/windows/common/windows';
+
+/**
+ * Exported subset of CodeWindow for testing.
+ */
+export interface ISimpleWindow {
+	openedWorkspacePath: string;
+	lastFocusTime: number;
+}
+
+/**
+ * Exported for testing.
+ */
+export interface IBestWindowOrFolderOptions<W extends ISimpleWindow> {
+	windows: W[];
+	newWindow: boolean;
+	reuseWindow: boolean;
+	context: OpenContext;
+	filePath?: string;
+	userHome?: string;
+	codeSettingsFolder?: string;
+}
+
+export function findBestWindowOrFolderForFile<W extends ISimpleWindow>({ windows, newWindow, reuseWindow, context, filePath, userHome, codeSettingsFolder }: IBestWindowOrFolderOptions<W>): W | string {
+	if (!newWindow && filePath && (context === OpenContext.DESKTOP || context === OpenContext.CLI || context === OpenContext.DOCK)) {
+		const windowOnFilePath = findWindowOnFilePath(windows, filePath);
+		const folderWithCodeSettings = !reuseWindow && findFolderWithCodeSettings(filePath, userHome, codeSettingsFolder);
+
+		// Return if we found a window that has the parent of the file path opened
+		if (windowOnFilePath && !(folderWithCodeSettings && folderWithCodeSettings.length > windowOnFilePath.openedWorkspacePath.length)) {
+			return windowOnFilePath;
+		}
+
+		// Return if we found a parent folder with a code settings folder inside
+		if (folderWithCodeSettings) {
+			return folderWithCodeSettings;
+		}
+	}
+
+	return !newWindow ? getLastActiveWindow(windows) : null;
+}
+
+function findWindowOnFilePath<W extends ISimpleWindow>(windows: W[], filePath: string): W {
+
+	// From all windows that have the parent of the file opened, return the window
+	// that has the most specific folder opened ( = longest path wins)
+	const windowsOnFilePath = windows.filter(window => typeof window.openedWorkspacePath === 'string' && paths.isEqualOrParent(filePath, window.openedWorkspacePath, !platform.isLinux /* ignorecase */));
+	if (windowsOnFilePath.length) {
+		return windowsOnFilePath.sort((a, b) => -(a.openedWorkspacePath.length - b.openedWorkspacePath.length))[0];
+	}
+
+	return null;
+}
+
+function findFolderWithCodeSettings(filePath: string, userHome?: string, codeSettingsFolder?: string): string {
+	let folder = path.dirname(paths.normalize(filePath, true));
+	let homeFolder = userHome && paths.normalize(userHome, true);
+	if (!platform.isLinux) {
+		homeFolder = homeFolder && homeFolder.toLowerCase();
+	}
+
+	let previous = null;
+	while (folder !== previous) {
+		if (hasCodeSettings(folder, homeFolder, codeSettingsFolder)) {
+			return folder;
+		}
+
+		previous = folder;
+		folder = path.dirname(folder);
+	}
+
+	return null;
+}
+
+function hasCodeSettings(folder: string, normalizedUserHome?: string, codeSettingsFolder = '.vscode') {
+	try {
+		if ((platform.isLinux ? folder : folder.toLowerCase()) === normalizedUserHome) {
+			return fs.statSync(path.join(folder, codeSettingsFolder, 'settings.json')).isFile(); // ~/.vscode/extensions is used for extensions
+		}
+
+		return fs.statSync(path.join(folder, codeSettingsFolder)).isDirectory();
+	} catch (err) {
+		// assume impossible to access
+	}
+
+	return false;
+}
+
+export function getLastActiveWindow<W extends ISimpleWindow>(windows: W[]): W {
+	if (windows.length) {
+		const lastFocussedDate = Math.max.apply(Math, windows.map(w => w.lastFocusTime));
+		const res = windows.filter(w => w.lastFocusTime === lastFocussedDate);
+		if (res && res.length) {
+			return res[0];
+		}
+	}
+
+	return null;
+}