feat: move authentication inside Auditui class

main.py

@@ -683,9 +683,8 @@ class Auditui(App):
         except Exception:
             return None
 
-
+    def authenticate(self) -> None:
-def authenticate():
+        """Authenticate with Audible and set auth and client objects."""
-    """Authenticate with Audible and return auth and client objects."""
         auth_path = Path.home() / ".config" / "auditui" / "auth.json"
         auth_path.parent.mkdir(parents=True, exist_ok=True)
 
@@ -693,7 +692,9 @@ def authenticate():
             try:
                 authenticator = audible.Authenticator.from_file(str(auth_path))
                 audible_client = audible.Client(auth=authenticator)
-            return authenticator, audible_client
+                self.auth = authenticator
+                self.client = audible_client
+                return
             except (OSError, ValueError, KeyError) as e:
                 print(f"Failed to load existing auth: {e}")
                 print("Please re-authenticate.")
@@ -706,9 +707,10 @@ def authenticate():
 
         email = input("\nEmail: ")
         password = getpass("Password: ")
-    marketplace = input("Marketplace locale (default: US): ").strip().upper() or "US"
+        marketplace = (
+            input("Marketplace locale (default: US): ").strip().upper() or "US"
+        )
 
-    try:
         authenticator = audible.Authenticator.from_login(
             username=email, password=password, locale=marketplace
         )
@@ -717,14 +719,11 @@ def authenticate():
         authenticator.to_file(str(auth_path))
         print("Authentication successful!")
         audible_client = audible.Client(auth=authenticator)
-        return authenticator, audible_client
+        self.auth = authenticator
-
+        self.client = audible_client
-    except (OSError, ValueError, KeyError) as e:
-        print(f"Authentication failed: {e}")
-        sys.exit(1)
 
 
 if __name__ == "__main__":
     app = Auditui()
-    app.auth, app.client = authenticate()
+    app.authenticate()
     app.run()