Enable syntax highlighting for URDFs (#26)

package.json

@@ -56,6 +56,7 @@
   "dependencies": {
     "@jupyterlab/application": "^3.4.0",
     "@jupyterlab/apputils": "^3.4.0",
+    "@jupyterlab/codemirror": "^3.4.8",
     "@jupyterlab/docregistry": "^3.4.0",
     "@jupyterlab/filebrowser": "^3.4.0",
     "@jupyterlab/launcher": "^3.4.0",
@@ -66,10 +67,11 @@
     "@lumino/messaging": "^1.10.0",
     "@lumino/signaling": "^1.10.0",
     "@lumino/widgets": "^1.30.0",
-    "amphion": "npm:@robostack/amphion@^0.1.25",
-    "roslib": "npm:@robostack/roslib@^1.1.1",
+    "@types/codemirror": "^5.60.5",
     "@types/dat.gui": "^0.7.7",
-    "dat.gui": "^0.7.9"
+    "amphion": "npm:@robostack/amphion@^0.1.25",
+    "dat.gui": "^0.7.9",
+    "roslib": "npm:@robostack/roslib@^1.1.1"
   },
   "devDependencies": {
     "@babel/core": "^7.0.0",

src/index.ts

@@ -26,6 +26,9 @@ import { UrdfWidgetFactory } from './factory';
 
 import { urdf_icon } from './icons';
 
+// For syntax highlighting
+import { Mode } from '@jupyterlab/codemirror';
+
 // Name of the factory that creates the URDF widgets
 const FACTORY = 'URDF Widget Factory';
 
@@ -90,6 +93,14 @@ const extension: JupyterFrontEndPlugin<void> = {
       tracker.add(widget);
     });
 
+    // Syntax highlighting
+    Mode.getModeInfo().push({
+      name: 'URDF',
+      mime: 'text/xml',
+      mode: 'xml',
+      ext: ['urdf', 'xacro']
+    });
+
     // Register widget and model factories
     app.docRegistry.addWidgetFactory(widgetFactory);
 
@@ -101,6 +112,7 @@ const extension: JupyterFrontEndPlugin<void> = {
       iconClass: 'jp-URDFIcon',
       fileFormat: 'text',
       contentType: 'file',
+      mimeTypes: ['application/xml', 'text/xml'],
       icon: urdf_icon
     });