introduce files.watcherExclude to be able to configure exclusions for file watching

src/vs/platform/files/common/files.ts

@@ -429,6 +429,7 @@ export interface IFilesConfiguration {
 	files: {
 		associations: { [filepattern: string]: string };
 		exclude: glob.IExpression;
+		watcherExclude: string[];
 		encoding: string;
 		trimTrailingWhitespace: boolean;
 		autoSave: string;

src/vs/workbench/parts/files/browser/files.contribution.ts

@@ -227,6 +227,14 @@ configurationRegistry.registerConfiguration({
 			'type': 'number',
 			'default': 1000,
 			'description': nls.localize('autoSaveDelay', "Controls the delay in ms after which a dirty file is saved automatically. Only applies when \"files.autoSave\" is set to \"{0}\"", AutoSaveConfiguration.AFTER_DELAY)
+		},
+		'files.watcherExclude': {
+			'type': 'array',
+			'items': {
+				'type': 'string'
+			},
+			'default': platform.isLinux ? ['**/.git/objects/**', '**/node_modules/**'] : ['**/.git/objects/**'],
+			'description': nls.localize('watcherExclude', "Configure glob patterns of file paths to exclude from file watching. Changing this setting requires a restart. When you experience Code consuming lots of cpu time on startup, you can exclude large folders to reduce the initial load.")
 		}
 	}
 });

src/vs/workbench/services/files/electron-browser/fileService.ts

@@ -7,7 +7,6 @@
 import nls = require('vs/nls');
 import {TPromise} from 'vs/base/common/winjs.base';
 import paths = require('vs/base/common/paths');
-import platform = require('vs/base/common/platform');
 import encoding = require('vs/base/node/encoding');
 import errors = require('vs/base/common/errors');
 import strings = require('vs/base/common/strings');
@@ -44,17 +43,12 @@ export class FileService implements files.IFileService {
 				encodingOverride.push({ resource: uri.file(paths.join(this.contextService.getWorkspace().resource.fsPath, '.vscode')), encoding: encoding.UTF8 });
 			}
 
-			let doNotWatch = ['**/.git/objects/**']; 	// this folder does the heavy duty for git and we don't need to watch it
-			if (platform.isLinux) {
-				doNotWatch.push('**/node_modules/**'); 	// Linux does not have a good watching implementation, so we exclude more
-			}
-
 			// build config
 			let fileServiceConfig: IFileServiceOptions = {
 				errorLogger: (msg: string) => errors.onUnexpectedError(msg),
 				encoding: configuration.files && configuration.files.encoding,
 				encodingOverride: encodingOverride,
-				watcherIgnoredPatterns: doNotWatch,
+				watcherIgnoredPatterns: configuration.files && configuration.files.watcherExclude || [],
 				verboseLogging: this.contextService.getConfiguration().env.verboseLogging
 			};
 

src/vs/workbench/services/files/node/watcher/win32/watcherService.ts

@@ -17,7 +17,7 @@ export class FileWatcher {
 		this.eventEmitter = eventEmitter;
 	}
 
-	public startWatching(): () => void /* dispose */ {
+	public startWatching(): () => void {
 		let watcher = new OutOfProcessWin32FolderWatcher(
 			this.basePath,
 			this.ignored,