Fix

Signed-off-by: Anatoliy Bazko <abazko@redhat.com>

packages/core/src/browser/frontend-application-module.ts

@@ -72,6 +72,7 @@ import { QuickPickService, quickPickServicePath } from '../common/quick-pick-ser
 import { ContextKeyService } from './context-key-service';
 import { ResourceContextKey } from './resource-context-key';
 import { KeyboardLayoutService } from './keyboard/keyboard-layout-service';
+import { MimeService } from './mime-service';
 
 export const frontendApplicationModule = new ContainerModule((bind, unbind, isBound, rebind) => {
     const themeService = ThemeService.get();
@@ -249,4 +250,6 @@ export const frontendApplicationModule = new ContainerModule((bind, unbind, isBo
     );
 
     bindCorePreferences(bind);
+
+    bind(MimeService).toSelf().inSingletonScope();
 });

packages/core/src/browser/mime-service.ts

@@ -0,0 +1,30 @@
+/********************************************************************************
+ * Copyright (C) 2019 Red Hat, Inc. and others.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * This Source Code may also be made available under the following Secondary
+ * Licenses when the conditions for such availability set forth in the Eclipse
+ * Public License v. 2.0 are satisfied: GNU General Public License, version 2
+ * with the GNU Classpath Exception which is available at
+ * https://www.gnu.org/software/classpath/license.html.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
+ ********************************************************************************/
+
+import { injectable } from 'inversify';
+
+export interface MimeAssociation {
+    readonly id: string;
+    readonly filepattern: string;
+}
+
+@injectable()
+export class MimeService {
+    // should be overridden by an implementation
+    setAssociations(associations: MimeAssociation[]): void {
+        /* no-op by default */
+    }
+}

packages/filesystem/src/browser/filesystem-frontend-contribution.ts

@@ -20,9 +20,11 @@ import { MaybePromise } from '@theia/core/lib/common';
 import {
     FrontendApplicationContribution, ApplicationShell,
     NavigatableWidget, NavigatableWidgetOptions,
-    Saveable, WidgetManager, StatefulWidget
+    Saveable, WidgetManager, StatefulWidget, FrontendApplication
 } from '@theia/core/lib/browser';
 import { FileSystemWatcher, FileChangeEvent, FileMoveEvent, FileChangeType } from './filesystem-watcher';
+import { MimeService } from '@theia/core/lib/browser/mime-service';
+import { FileSystemPreferences } from './filesystem-preferences';
 
 @injectable()
 export class FileSystemFrontendContribution implements FrontendApplicationContribution {
@@ -36,11 +38,26 @@ export class FileSystemFrontendContribution implements FrontendApplicationContri
     @inject(FileSystemWatcher)
     protected readonly fileSystemWatcher: FileSystemWatcher;
 
+    @inject(MimeService)
+    protected readonly mimeService: MimeService;
+
+    @inject(FileSystemPreferences)
+    protected readonly preferences: FileSystemPreferences;
+
     initialize(): void {
         this.fileSystemWatcher.onFilesChanged(event => this.run(() => this.updateWidgets(event)));
         this.fileSystemWatcher.onDidMove(event => this.run(() => this.moveWidgets(event)));
     }
 
+    onStart?(app: FrontendApplication): MaybePromise<void> {
+        this.updateAssociations();
+        this.preferences.onPreferenceChanged(e => {
+            if (e.preferenceName === 'files.associations') {
+                this.updateAssociations();
+            }
+        });
+    }
+
     protected pendingOperation = Promise.resolve();
     protected run(operation: () => MaybePromise<void>): Promise<void> {
         return this.pendingOperation = this.pendingOperation.then(async () => {
@@ -141,4 +158,9 @@ export class FileSystemFrontendContribution implements FrontendApplicationContri
         }
     }
 
+    protected updateAssociations(): void {
+        const fileAssociations = this.preferences['files.associations'];
+        const mimeAssociations = Object.keys(fileAssociations).map(filepattern => ({ id: fileAssociations[filepattern], filepattern }));
+        this.mimeService.setAssociations(mimeAssociations);
+    }
 }

packages/filesystem/src/browser/filesystem-preferences.ts

@@ -48,6 +48,11 @@ export const filesystemPreferenceSchema: PreferenceSchema = {
             'type': 'boolean',
             'default': true,
             'description': 'Moves files/folders to the OS trash (recycle bin on Windows) when deleting. Disabling this will delete files/folders permanently.'
+        },
+        'files.associations': {
+            'type': 'object',
+            'description': 'Configure file associations to languages (e.g. \"*.extension\": \"html\"). \
+These have precedence over the default associations of the languages installed.'
         }
     }
 };
@@ -56,6 +61,7 @@ export interface FileSystemConfiguration {
     'files.watcherExclude': { [globPattern: string]: boolean };
     'files.exclude': { [key: string]: boolean };
     'files.enableTrash': boolean;
+    'files.associations': { [filepattern: string]: string };
 }
 
 export const FileSystemPreferences = Symbol('FileSystemPreferences');

packages/monaco/src/browser/monaco-frontend-module.ts

@@ -52,6 +52,8 @@ import { OutlineTreeDecorator } from '@theia/outline-view/lib/browser/outline-de
 import { MonacoSnippetSuggestProvider } from './monaco-snippet-suggest-provider';
 import { ContextKeyService } from '@theia/core/lib/browser/context-key-service';
 import { MonacoContextKeyService } from './monaco-context-key-service';
+import { MonacoMimeService } from './monaco-mime-service';
+import { MimeService } from '@theia/core/lib/browser/mime-service';
 
 const deepmerge: (args: object[]) => object = require('deepmerge').default.all;
 
@@ -119,6 +121,9 @@ export default new ContainerModule((bind, unbind, isBound, rebind) => {
 
     bind(MonacoOutlineDecorator).toSelf().inSingletonScope();
     bind(OutlineTreeDecorator).toService(MonacoOutlineDecorator);
+
+    bind(MonacoMimeService).toSelf().inSingletonScope();
+    rebind(MimeService).toService(MonacoMimeService);
 });
 
 export const MonacoConfigurationService = Symbol('MonacoConfigurationService');

packages/monaco/src/browser/monaco-loader.ts

@@ -53,6 +53,7 @@ export function loadMonaco(vsRequire: any): Promise<void> {
                 'vs/platform/keybinding/common/usLayoutResolvedKeybinding',
                 'vs/base/common/keybindingLabels',
                 'vs/base/common/keyCodes',
+                'vs/base/common/mime',
                 'vs/editor/browser/editorExtensions',
                 'vs/editor/standalone/browser/simpleServices',
                 'vs/editor/standalone/browser/standaloneServices',
@@ -76,7 +77,7 @@ export function loadMonaco(vsRequire: any): Promise<void> {
                 'vs/platform/contextkey/browser/contextKeyService'
             ], (css: any, html: any, commands: any, actions: any,
                 keybindingsRegistry: any, keybindingResolver: any, resolvedKeybinding: any, keybindingLabels: any,
-                keyCodes: any, editorExtensions: any, simpleServices: any, standaloneServices: any, quickOpen: any, quickOpenWidget: any, quickOpenModel: any,
+                keyCodes: any, mime: any, editorExtensions: any, simpleServices: any, standaloneServices: any, quickOpen: any, quickOpenWidget: any, quickOpenModel: any,
                 filters: any, styler: any, platform: any, modes: any, suggest: any, suggestController: any, findController: any, rename: any, snippetParser: any,
                 configuration: any, configurationModels: any,
                 codeEditorService: any, codeEditorServiceImpl: any,
@@ -99,6 +100,7 @@ export function loadMonaco(vsRequire: any): Promise<void> {
                     global.monaco.snippetParser = snippetParser;
                     global.monaco.contextkey = contextKey;
                     global.monaco.contextKeyService = contextKeyService;
+                    global.monaco.mime = mime;
                     resolve();
                 });
         });

packages/monaco/src/browser/monaco-mime-service.ts

@@ -0,0 +1,41 @@
+/********************************************************************************
+ * Copyright (C) 2019 Red Hat, Inc. and others.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * This Source Code may also be made available under the following Secondary
+ * Licenses when the conditions for such availability set forth in the Eclipse
+ * Public License v. 2.0 are satisfied: GNU General Public License, version 2
+ * with the GNU Classpath Exception which is available at
+ * https://www.gnu.org/software/classpath/license.html.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
+ ********************************************************************************/
+
+import { MimeAssociation, MimeService } from '@theia/core/lib/browser/mime-service';
+import { injectable } from 'inversify';
+
+@injectable()
+export class MonacoMimeService extends MimeService {
+
+    setAssociations(associations: MimeAssociation[]): void {
+        monaco.mime.clearTextMimes(true);
+
+        for (const association of associations) {
+            const mimetype = this.getMimeForMode(association.id) || `text/x-${association.id}`;
+            monaco.mime.registerTextMime({ id: association.id, mime: mimetype, filepattern: association.filepattern, userConfigured: true }, false);
+        }
+    }
+
+    protected getMimeForMode(langId: string): string | undefined {
+        for (const language of monaco.languages.getLanguages()) {
+            if (language.id === langId && language.mimetypes) {
+                return language.mimetypes[0];
+            }
+        }
+
+        return undefined;
+    }
+}

packages/monaco/src/typings/monaco/index.d.ts

@@ -1112,3 +1112,19 @@ declare module monaco.contextkey {
         static deserialize(when: string): ContextKeyExpr;
     }
 }
+
+declare module monaco.mime {
+    export interface ITextMimeAssociation {
+        readonly id: string;
+        readonly mime: string;
+        readonly filename?: string;
+        readonly extension?: string;
+        readonly filepattern?: string;
+        readonly firstline?: RegExp;
+        readonly userConfigured?: boolean;
+    }
+
+    export function registerTextMime(association: monaco.mime.ITextMimeAssociation, warnOnOverwrite: boolean): void
+
+    export function clearTextMimes(onlyUserConfigured?: boolean): void;
+}

packages/plugin-ext/src/plugin/preference-registry.ts

@@ -80,7 +80,6 @@ export class PreferenceRegistryExtImpl implements PreferenceRegistryExt {
     }
 
     init(data: PreferenceData): void {
-        data[PreferenceScope.Default]['files.associations'] = {};
         this._preferences = this.parse(data);
     }