Added is_initialised function. Fixes #46.

meorg_client/client.py

@@ -419,3 +419,22 @@ def success(self) -> bool:
             True if successful, False otherwise.
         """
         return self.last_response.status_code in mcc.HTTP_STATUS_SUCCESS_RANGE
+
+    def is_initialised(self, dev=False) -> bool:
+        """Check if the client is initialised.
+
+        NOTE: This does not check the login actually works.
+
+        Parameters
+        ----------
+        dev : bool, optional
+            Use dev credentials, by default False
+
+        Returns
+        -------
+        bool
+            True if initialised, False otherwise.
+        """
+        cred_filename = "credentials.json" if not dev else "credentials-dev.json"
+        cred_filepath = mu.get_user_data_filepath(cred_filename)
+        return cred_filepath.exists()