Add translation for the frontend in Lab

package.json

@@ -18,7 +18,7 @@
     "updated": "lerna updated",
     "watch:webapp": "run-p watch:lib watch:app",
     "watch:app": "lerna exec --stream --scope \"nbdime-webapp\" npm run watch",
-    "watch:lib": "lerna exec --stream --scope \"nbdime\" --scope \"nbdime-jupyterlab\" npm run watch"
+    "watch:lib": "lerna exec --stream --parallel --scope \"nbdime\" --scope \"nbdime-jupyterlab\" npm run watch"
   },
   "devDependencies": {
     "@jupyterlab/buildutils": "^4.0.0",

packages/labextension/package.json

@@ -30,16 +30,19 @@
   ],
   "style": "style/index.css",
   "scripts": {
-    "build": "npm run build:lib && npm run build:labextension",
+    "build": "npm run build:lib:prod && npm run build:labextension",
     "build:dev": "npm run build:lib && jupyter labextension build --development True .",
     "build:labextension": "rimraf ../../nbdime/labextension && mkdirp ../../nbdime/labextension && jupyter labextension build .",
-    "build:lib": "tsc --build",
+    "build:lib": "tsc --sourceMap",
+    "build:lib:prod": "tsc --build",
     "clean": "npm run clean:lib && npm run clean:labextension",
     "clean:labextension": "rimraf ../../nbdime/labextension",
     "clean:lib": "rimraf tsconfig.tsbuildinfo lib",
     "prepublishOnly": "npm run build",
     "update": "rimraf node_modules/nbdime && npm install && npm run build",
-    "watch": "tsc --build --watch"
+    "watch": "run-p watch:src watch:labextension",
+    "watch:src": "tsc -w --sourceMap",
+    "watch:labextension": "jupyter labextension watch ."
   },
   "dependencies": {
     "@jupyterlab/apputils": "^4.0.0",
@@ -50,6 +53,7 @@
     "@jupyterlab/rendermime": "^4.0.0",
     "@jupyterlab/services": "^7.0.0",
     "@jupyterlab/settingregistry": "^4.0.0",
+    "@jupyterlab/translation": "^4.0.0",
     "@lumino/algorithm": "^2.0.1",
     "@lumino/coreutils": "^2.1.2",
     "@lumino/disposable": "^2.1.2",
@@ -62,6 +66,7 @@
     "@jupyterlab/docregistry": "^4.0.0",
     "@lumino/commands": "^2.0.0",
     "mkdirp": "^3.0.0",
+    "npm-run-all": "^4.1.5",
     "rimraf": "^5.0.0",
     "typescript": "^4.9.0"
   },

packages/labextension/src/actions.ts

@@ -1,11 +1,13 @@
+import type { CodeEditor } from '@jupyterlab/codeeditor';
+
 import { PathExt, URLExt } from '@jupyterlab/coreutils';
 
 import type { IRenderMimeRegistry } from '@jupyterlab/rendermime';
 
-import type { CodeEditor } from '@jupyterlab/codeeditor';
-
 import { ServerConnection } from '@jupyterlab/services';
 
+import { nullTranslator, type ITranslator } from '@jupyterlab/translation';
+
 import type { Widget } from '@lumino/widgets';
 
 import { NbdimeWidget } from './widget';
@@ -22,11 +24,13 @@ export function diffNotebook(args: {
   readonly rendermime: IRenderMimeRegistry;
   readonly editorFactory: CodeEditor.Factory;
   hideUnchanged?: boolean;
+  translator?: ITranslator;
 }): Widget {
-  let { base, remote } = args;
+  let { base, remote, translator } = args;
+  const trans = (translator ?? nullTranslator).load('nbdime');
   let widget = new NbdimeWidget(args);
-  widget.title.label = `Diff: ${base} ↔ ${remote}`;
-  widget.title.caption = `Local: ${base}\nRemote: '${remote}'`;
+  widget.title.label = trans.__('Diff: %1 ↔ %2', base, remote);
+  widget.title.caption = trans.__("Local: '%1'\nRemote: '%2'", base, remote);
   return widget;
 }
 
@@ -35,20 +39,27 @@ export function diffNotebookCheckpoint(args: {
   readonly rendermime: IRenderMimeRegistry;
   readonly editorFactory: CodeEditor.Factory;
   hideUnchanged?: boolean;
+  translator?: ITranslator;
 }): Widget {
-  const { path, rendermime, hideUnchanged, editorFactory } = args;
+  const { path, rendermime, hideUnchanged, editorFactory, translator } = args;
+  const trans = (translator ?? nullTranslator).load('nbdime');
   let nb_dir = PathExt.dirname(path);
   let name = PathExt.basename(path, '.ipynb');
   let base = PathExt.join(nb_dir, name + '.ipynb');
+
   let widget = new NbdimeWidget({
     base,
     editorFactory,
     rendermime,
-    baseLabel: 'Checkpoint',
+    baseLabel: trans.__('Checkpoint'),
     hideUnchanged,
+    translator,
   });
-  widget.title.label = `Diff checkpoint: ${name}`;
-  widget.title.caption = `Local: latest checkpoint\nRemote: '${path}'`;
+  widget.title.label = trans.__('Diff checkpoint: %1', name);
+  widget.title.caption = trans.__(
+    "Local: latest checkpoint\nRemote: '%1'",
+    path,
+  );
   widget.title.iconClass = 'fa fa-clock-o jp-fa-tabIcon';
   return widget;
 }
@@ -58,17 +69,20 @@ export function diffNotebookGit(args: {
   readonly rendermime: IRenderMimeRegistry;
   readonly editorFactory: CodeEditor.Factory;
   hideUnchanged?: boolean;
+  translator?: ITranslator;
 }): Widget {
-  const { path, rendermime, hideUnchanged, editorFactory } = args;
+  const { path, rendermime, hideUnchanged, editorFactory, translator } = args;
+  const trans = (translator ?? nullTranslator).load('nbdime');
   let name = PathExt.basename(path, '.ipynb');
   let widget = new NbdimeWidget({
     base: path,
     editorFactory,
     rendermime,
     hideUnchanged,
+    translator,
   });
-  widget.title.label = `Diff git: ${name}`;
-  widget.title.caption = `Local: git HEAD\nRemote: '${path}'`;
+  widget.title.label = trans.__('Diff git: %1', name);
+  widget.title.caption = trans.__("Local: git HEAD\nRemote: '%1'", path);
   widget.title.iconClass = 'fa fa-git jp-fa-tabIcon';
   return widget;
 }

packages/labextension/src/plugin.ts

@@ -22,6 +22,8 @@ import { NotebookPanel, INotebookTracker } from '@jupyterlab/notebook';
 
 import { ISettingRegistry } from '@jupyterlab/settingregistry';
 
+import { ITranslator, nullTranslator } from '@jupyterlab/translation';
+
 import { find } from '@lumino/algorithm';
 
 import type { CommandRegistry } from '@lumino/commands';
@@ -32,12 +34,6 @@ import { diffNotebookGit, diffNotebookCheckpoint, isNbInGit } from './actions';
 
 const pluginId = 'nbdime-jupyterlab:plugin';
 
-/**
- * Error message if the nbdime API is unavailable.
- */
-const serverMissingMsg =
-  'Unable to query nbdime API. Is the server extension enabled?';
-
 const INITIAL_NETWORK_RETRY = 2; // ms
 
 export class NBDiffExtension
@@ -116,11 +112,20 @@ function addCommands(
   rendermime: IRenderMimeRegistry,
   settings: ISettingRegistry.ISettings,
   editorServices: IEditorServices,
+  translator: ITranslator,
 ): void {
   const { commands, shell } = app;
   const editorFactory = editorServices.factoryService.newInlineEditor.bind(
     editorServices.factoryService,
   );
+  const trans = translator.load('nbdime');
+
+  /**
+   * Error message if the nbdime API is unavailable.
+   */
+  const serverMissingMsg = trans.__(
+    'Unable to query nbdime API. Is the server extension enabled?',
+  );
 
   // Whether we have our server extension available
   let hasAPI = true;
@@ -194,10 +199,10 @@ function addCommands(
       // TODO: Check args for base/remote
       // if missing, prompt with dialog.
       //let content = current.notebook;
-      //diffNotebook({base, remote});
+      //diffNotebook({base, remote, translator});
     },
-    label: erroredGen('Notebook diff'),
-    caption: erroredGen('Display nbdiff between two notebooks'),
+    label: erroredGen(trans.__('Notebook diff')),
+    caption: erroredGen(trans.__('Display nbdiff between two notebooks')),
     isEnabled: baseEnabled,
     iconClass:
       'jp-Icon jp-Icon-16 action-notebook-diff action-notebook-diff-notebooks',
@@ -215,15 +220,16 @@ function addCommands(
         editorFactory,
         rendermime,
         hideUnchanged,
+        translator,
       });
       shell.add(widget);
       if (args['activate'] !== false) {
         shell.activateById(widget.id);
       }
     },
-    label: erroredGen('Notebook checkpoint diff'),
+    label: erroredGen(trans.__('Notebook checkpoint diff')),
     caption: erroredGen(
-      'Display nbdiff from checkpoint to currently saved version',
+      trans.__('Display nbdiff from checkpoint to currently saved version'),
     ),
     isEnabled: baseEnabled,
     iconClass:
@@ -241,15 +247,16 @@ function addCommands(
         editorFactory,
         rendermime,
         hideUnchanged,
+        translator,
       });
       shell.add(widget);
       if (args['activate'] !== false) {
         shell.activateById(widget.id);
       }
     },
-    label: erroredGen('Notebook Git diff'),
+    label: erroredGen(trans.__('Notebook Git diff')),
     caption: erroredGen(
-      'Display nbdiff from git HEAD to currently saved version',
+      trans.__('Display nbdiff from git HEAD to currently saved version'),
     ),
     isEnabled: hasGitNotebook,
     iconClass:
@@ -268,6 +275,7 @@ const nbDiffProvider: JupyterFrontEndPlugin<void> = {
     ISettingRegistry,
     IEditorServices,
   ],
+  optional: [ITranslator],
   activate: activateWidgetExtension,
   autoStart: true,
 };
@@ -283,13 +291,21 @@ async function activateWidgetExtension(
   rendermime: IRenderMimeRegistry,
   settingsRegistry: ISettingRegistry,
   editorServices: IEditorServices,
+  translator: ITranslator | null,
 ): Promise<void> {
   let { commands, docRegistry } = app;
   let extension = new NBDiffExtension(commands);
   docRegistry.addWidgetExtension('Notebook', extension);
 
   const settings = await settingsRegistry.load(pluginId);
-  addCommands(app, tracker, rendermime, settings, editorServices);
+  addCommands(
+    app,
+    tracker,
+    rendermime,
+    settings,
+    editorServices,
+    translator ?? nullTranslator,
+  );
   // Update the command registry when the notebook state changes.
   tracker.currentChanged.connect(() => {
     commands.notifyCommandChanged(CommandIDs.diffNotebookGit);

packages/labextension/src/widget.ts

@@ -6,6 +6,12 @@ import type { IRenderMimeRegistry } from '@jupyterlab/rendermime';
 
 import { ServerConnection } from '@jupyterlab/services';
 
+import {
+  nullTranslator,
+  type ITranslator,
+  type TranslationBundle,
+} from '@jupyterlab/translation';
+
 import type { JSONObject } from '@lumino/coreutils';
 
 import type { Message } from '@lumino/messaging';
@@ -53,6 +59,8 @@ export class NbdimeWidget extends Panel {
     this.remote = options.remote;
     this.editorFactory = options.editorFactory;
     this.rendermime = options.rendermime;
+    this.translator = options.translator ?? nullTranslator;
+    this.trans = this.translator.load('nbdime');
 
     let header = Private.diffHeader(options);
     this.addWidget(header);
@@ -116,10 +124,17 @@ export class NbdimeWidget extends Panel {
     let base = data['base'] as nbformat.INotebookContent;
     let diff = data['diff'] as any as IDiffEntry[];
     let nbdModel = new NotebookDiffModel(base, diff);
+    if (nbdModel.metadata) {
+      const trans = this.translator.load('nbdime');
+      nbdModel.metadata.collapsibleHeader = trans.__(
+        'Notebook metadata changed',
+      );
+    }
     let nbdWidget = new NotebookDiffWidget({
       model: nbdModel,
       rendermime: this.rendermime,
       editorFactory: this.editorFactory,
+      translator: this.translator,
     });
 
     this.scroller.addWidget(nbdWidget);
@@ -135,7 +150,7 @@ export class NbdimeWidget extends Panel {
       return;
     }
     let widget = new Widget();
-    widget.node.innerHTML = `Failed to fetch diff: ${error}`;
+    widget.node.textContent = this.trans.__('Failed to fetch diff: %1', error);
     this.scroller.addWidget(widget);
   }
 
@@ -144,6 +159,8 @@ export class NbdimeWidget extends Panel {
 
   protected editorFactory: CodeEditor.Factory;
   protected rendermime: IRenderMimeRegistry;
+  protected translator: ITranslator;
+  protected trans: TranslationBundle;
 
   protected header: Widget;
   protected scroller: Panel;
@@ -193,6 +210,11 @@ export namespace NbdimeWidget {
      * Whether to hide unchanged cells by default.
      */
     hideUnchanged?: boolean;
+
+    /**
+     * Application translator.
+     */
+    translator?: ITranslator;
   }
 }
 
@@ -201,7 +223,8 @@ namespace Private {
    * Create a header widget for the diff view.
    */
   export function diffHeader(options: NbdimeWidget.IOptions): Widget {
-    let { base, remote, baseLabel, remoteLabel } = options;
+    let { base, remote, baseLabel, remoteLabel, translator } = options;
+    const trans = (translator ?? nullTranslator).load('nbdime');
     if (remote) {
       if (baseLabel === undefined) {
         baseLabel = base;
@@ -220,19 +243,24 @@ namespace Private {
     node.className = 'nbdime-Diff';
     node.innerHTML = `
       <div class="nbdime-header-buttonrow">
-        <label><input class="nbdime-hide-unchanged" type="checkbox">Hide unchanged cells</label>
-        <button class="nbdime-export" style="display: none">Export diff</button>
+        <label><input class="nbdime-hide-unchanged" type="checkbox"></label>
+        <button class="nbdime-export" style="display: none"></button>
       </div>
       <div class="nbdime-header-banner">
         <span class="nbdime-header-base"></span>
         <span class="nbdime-header-remote"></span>
       </div>`;
+    node
+      .querySelector('.nbdime-header-buttonrow > label')!
+      .insertAdjacentText('beforeend', trans.__('Hide unchanged cells'));
+    node.querySelector('button.nbdime-export')!.textContent =
+      trans.__('Export diff');
     (
       node.getElementsByClassName('nbdime-header-base')[0] as HTMLSpanElement
-    ).innerText = baseLabel;
+    ).textContent = baseLabel;
     (
       node.getElementsByClassName('nbdime-header-remote')[0] as HTMLSpanElement
-    ).innerText = remoteLabel;
+    ).textContent = remoteLabel;
 
     return new Widget({ node });
   }