feat: new policy view with login CTA

package.json

@@ -217,8 +217,19 @@
         }
       ]
     },
+    "viewsWelcome": [
+      {
+        "view": "semgrep.view.policy",
+        "contents": "[Sign in](command:semgrep.login)",
+        "when": "!semgrep.loggedIn"
+      }
+    ],
     "views": {
       "semgrep-sidebar": [
+        {
+          "id": "semgrep.view.policy",
+          "name": "Policy Configuration"
+        },
         {
           "type": "webview",
           "id": "semgrep.searchView",

src/extension.ts

@@ -61,6 +61,12 @@
       ),
     ),
   );
+  context.subscriptions.push(
+    vscode.window.registerTreeDataProvider(
+      SemgrepPolicyViewProvider.viewType,
+      new SemgrepPolicyViewProvider(context.extensionUri),
+    ),
+  );
 
   // register content provider for the AST showing document
   context.subscriptions.push(

src/lsp.ts

@@ -249,8 +249,24 @@
     env.emitRulesRefreshedEvent();
   };
 
+  // TODO: This is an ugly hack to allow for easily updating the login status.
+  // It is rather fragile and we should instead do this by cleaning up the LSP
+  // extensions we use for login. However, this lets us ensure we have
+  // reasonably up-to-date UI state until then.
+  const updateLoginStatus: NotificationHandler<ShowMessageParams> = (
+    s: ShowMessageParams,
+  ) => {
+    if (
+      s.type === MessageType.Info &&
+      s.message === "Successfully logged into Semgrep Code"
+    ) {
+      env.loggedIn = true;
+    }
+  };
+
   // Register handlers here
   c.onNotification(rulesRefreshed, notificationHandler);
+  c.onNotification(ShowMessageNotification.type, updateLoginStatus);
   c.onTelemetry((e) => {
     // We only send errors, so we can safely cast this
     // See RPC_server.ml for the definition of LspErrorParams

src/views/policy.ts

@@ -0,0 +1,21 @@
+import * as vscode from "vscode";
+
+export class SemgrepPolicyViewProvider
+  implements vscode.TreeDataProvider<PolicyItem>
+{
+  public static readonly viewType = "semgrep.view.policy";
+
+  constructor(private readonly extensionUri: vscode.Uri) {}
+
+  getTreeItem(element: PolicyItem): PolicyItem {
+    return element;
+  }
+
+  getChildren(
+    element?: PolicyItem | undefined,
+  ): vscode.ProviderResult<PolicyItem[]> {
+    return [];
+  }
+}
+
+class PolicyItem extends vscode.TreeItem {}