[ADD] Don't spam rooms with errors.

callbacks.py

@@ -59,17 +59,12 @@ async def msg_cb(room: MatrixRoom, event: RoomMessageText) -> None:
                 await utils.send_png(room.room_id, filename)
 
 
-    for tex in re.findall(latex_regex, event.body, re.M):
+    for tex in re.findall(latex_regex, event.formatted_body, re.M):
         try:
             filename = latex.render(event.sender, tex)
             await utils.send_png(room.room_id, filename)
         except FileNotFoundError as e:
-            content = {
+            await utils.send_plain(room.room_id, e.args[0])
-                "msgtype": "m.text",
-                "body": f"Couldn't parse LaTeX correctly.\n```{e.args[0]}\n```",
-                "formatted_body": f"Couldn't parse LaTeX correctly.<br><code><pre>{e.args[0]}</pre></code>",
-            }
-            await client.room_send(room.room_id, message_type="m.room.message", content=content)
         except OSError:
             content = {
                 "msgtype": "m.text",

routes.py

@@ -43,12 +43,7 @@ async def route_lshow(router: Router, client: Client, room: str, event: RoomMess
             file = lilypond.render("", args[0], version=version)
             await utils.send_png(room, file)
         except FileNotFoundError as e:
-            content = {
+            await utils.send_plain(room, e.args[0])
-                "msgtype": "m.text",
-                "body": f"Couldn't parse LilyPond correctly.\n```{e.args[0]}\n```",
-                "formatted_body": f"Couldn't parse LilyPond correctly.<br><code><pre>{e.args[0]}</pre></code>",
-            }
-            await client.room_send(room, message_type="m.room.message", content=content)
         except Exception:
             # ???
             pass

utils.py

@@ -64,5 +64,27 @@ async def send_png(room: str, filename: str) -> None:
         "url": resp.content_uri,
     }
     file.close()
+async def send_plain(room: str, cnt: str) -> None:
+    import imagesize
+    import tempfile
+    import io
+
+    b = bytes(cnt, 'utf8')
+    size = len(b)
+
+    resp, keys = await client.upload(io.BytesIO(b), content_type="text/plain")
+
+    if not isinstance(resp, UploadResponse):
+        raise OSError("Couldn't upload file.")
+
+    content = {
+        "body": "error.log",
+        "info": {
+            "size": size,
+            "mimetype": "text/plain"
+        },
+        "msgtype": "m.file",
+        "url": resp.content_uri,
+    }
 
     await client.room_send(room, message_type="m.room.message", content=content)