feat: Allow users to set @angular/language-service from vscode (#415)

This PR allows users to change the version of typescript and
@angular/language-service used by the server from vscode.

Instead of using process.cwd() (which is a very bad idea), the extension
client should instead look for typescript and @angular/language-service
in the workspace folders.
If there's no workspace folder, fallback to the bundled version.

Author: Keen Yee Liau

client/src/extension.ts

@@ -17,15 +17,8 @@ export function activate(context: vscode.ExtensionContext) {
   // Log file does not yet exist on disk. It is up to the server to create the
   // file.
   const logFile = path.join(context.logPath, 'nglangsvc.log');
-  const ngProbeLocations = [
-    process.cwd(),                     // workspace version
-    context.asAbsolutePath('server'),  // bundled version
-  ];
-  const tsProbeLocations = [
-    process.cwd(),          // workspace version
-    context.extensionPath,  // bundled version
-  ];
-
+  const ngProbeLocations = getProbeLocations('angular.ngdk', context.asAbsolutePath('server'));
+  const tsProbeLocations = getProbeLocations('typescript.tsdk', context.extensionPath);
   // If the extension is launched in debug mode then the debug server options are used
   // Otherwise the run options are used
   const serverOptions: lsp.ServerOptions = {
@@ -133,3 +126,20 @@ export function activate(context: vscode.ExtensionContext) {
     });
   });
 }
+
+function getProbeLocations(configName: string, bundled: string): string[] {
+  const locations = [];
+  // Always use config value if it's specified
+  const configValue = vscode.workspace.getConfiguration().get(configName);
+  if (configValue) {
+    locations.push(configValue as string);
+  }
+  // If not, look in workspaces currently open
+  const workspaceFolders = vscode.workspace.workspaceFolders || [];
+  for (const folder of workspaceFolders) {
+    locations.push(folder.uri.fsPath);
+  }
+  // If all else fails, load the bundled version
+  locations.push(bundled);
+  return locations;
+}

package.json

@@ -23,7 +23,17 @@
         "title": "Restart Angular Language server",
         "category": "Angular"
       }
-    ]
+    ],
+    "configuration": {
+      "title": "Angular Language Service",
+      "properties": {
+        "angular.ngdk": {
+          "type": ["string", "null"],
+          "default": null,
+          "description": "Specifies the folder path to @angular/language-service."
+        }
+      }
+    }
   },
   "activationEvents": [
     "onLanguage:html",