Add text support to ReadWriteClient.write_message (#120)

The Vestaboard Read / Write API now supports passing text in addition to
the previously-supported rows of character codes.

It also now returns HTTP 200 (instead of HTTP 201) upon a successful
write, so update the response logic accordingly.

I've noticed that this endpoint also now returns HTTP 405 when the
written message matches the board's existing message, returning a JSON
error like this:

    {
      'status': 'error',
      'message': 'Message fingerprint matches the message that is already displayed on the board'
    }

This is surfaced to the caller as an HTTPStatusError (just like any
other request failure), but I may look at ways to make this a little
friendlier if this is the official server-side behavior.

tests/test_clients.py

@@ -190,13 +190,26 @@ def test_read_message_empty(
         message = rw_client.read_message()
         assert message is None
 
-    def test_write_message(self, rw_client: ReadWriteClient, respx_mock: MockRouter):
+    def test_write_message_text(
+        self, rw_client: ReadWriteClient, respx_mock: MockRouter
+    ):
+        text = "abc"
+        respx_mock.post("https://rw.vestaboard.com/").respond(200)
+        rw_client.write_message(text)
+
+    def test_write_message_list(
+        self, rw_client: ReadWriteClient, respx_mock: MockRouter
+    ):
         chars = [[0] * COLS] * ROWS
-        respx_mock.post("https://rw.vestaboard.com/").respond(201)
+        respx_mock.post("https://rw.vestaboard.com/").respond(200)
         assert rw_client.write_message(chars)
         assert respx_mock.calls.called
         assert respx_mock.calls.last.request.content == json.dumps(chars).encode()
 
-    def test_write_message_dimensions(self, rw_client: ReadWriteClient):
+    def test_write_message_list_dimensions(self, rw_client: ReadWriteClient):
         with pytest.raises(ValueError, match=rf"expected a \({COLS}, {ROWS}\) array"):
             rw_client.write_message([])
+
+    def test_write_message_type(self, rw_client: ReadWriteClient):
+        with pytest.raises(TypeError, match=r"unsupported message type"):
+            rw_client.write_message(True)  # type: ignore

vesta/clients.py

@@ -255,15 +255,29 @@ def read_message(self) -> Optional[Rows]:
             return json.loads(layout)
         return None
 
-    def write_message(self, message: Rows) -> bool:
+    def write_message(self, message: Union[str, Rows]) -> bool:
         """Write a message to the Vestaboard.
 
-        `message` must be a two-dimensional (6, 22) array of character codes
-        representing the exact positions of characters on the board.
+        `message` can be either a string of text or a two-dimensional (6, 22)
+        array of character codes representing the exact positions of characters
+        on the board.
+
+        If text is specified, the lines will be centered horizontally and
+        vertically. Character codes will be inferred for alphanumeric and
+        punctuation characters, or they can be explicitly specified using curly
+        braces containing the character code (such as ``{5}`` or ``{65}``).
 
         :raises ValueError: if ``message`` is a list with unsupported dimensions
         """
-        validate_rows(message)
-        r = self.http.post("", json=message)
+        data: Union[Dict[str, str], Rows]
+        if isinstance(message, str):
+            data = {"text": message}
+        elif isinstance(message, list):
+            validate_rows(message)
+            data = message
+        else:
+            raise TypeError(f"unsupported message type: {type(message)}")
+
+        r = self.http.post("", json=data)
         r.raise_for_status()
-        return r.status_code == httpx.codes.CREATED
+        return r.is_success