DefaultWorkspaceManager: improve error handling in traverseFolder (#2047)

Author: tomsontom

packages/langium/src/workspace/workspace-manager.ts

@@ -195,16 +195,20 @@ export class DefaultWorkspaceManager implements WorkspaceManager {
      * contained files that match the file extensions are added to the `uris` array.
      */
     protected async traverseFolder(folderPath: URI, uris: URI[]): Promise<void> {
-        const content = await this.fileSystemProvider.readDirectory(folderPath);
-        await Promise.all(content.map(async entry => {
-            if (this.shouldIncludeEntry(entry)) {
-                if (entry.isDirectory) {
-                    await this.traverseFolder(entry.uri, uris);
-                } else if (entry.isFile) {
-                    uris.push(entry.uri);
+        try {
+            const content = await this.fileSystemProvider.readDirectory(folderPath);
+            await Promise.all(content.map(async entry => {
+                if (this.shouldIncludeEntry(entry)) {
+                    if (entry.isDirectory) {
+                        await this.traverseFolder(entry.uri, uris);
+                    } else if (entry.isFile) {
+                        uris.push(entry.uri);
+                    }
                 }
-            }
-        }));
+            }));
+        } catch (e) {
+            console.error('Failure to read directory content of ' + folderPath.toString(true), e);
+        }
     }
 
     async searchFolder(uri: URI): Promise<URI[]> {