Reinstate outbound formatting

matrix_appservice_kakaotalk/formatter/from_matrix.py

@@ -19,6 +19,7 @@ from typing import NamedTuple
 
 from mautrix.appservice import IntentAPI
 from mautrix.types import Format, MessageEventContent, RelationType, RoomID, UserID
+from mautrix.util import utf16_surrogate
 from mautrix.util.formatter import (
     EntityString,
     EntityType,
@@ -46,6 +47,7 @@ class SendParams(NamedTuple):
 
 class KakaoTalkFormatString(EntityString[SimpleEntity, EntityType], MarkdownString):
     def format(self, entity_type: EntityType, **kwargs) -> KakaoTalkFormatString:
+        prefix = suffix = ""
         if entity_type == EntityType.USER_MENTION:
             self.entities.append(
                 SimpleEntity(
@@ -55,7 +57,32 @@ class KakaoTalkFormatString(EntityString[SimpleEntity, EntityType], MarkdownStri
                     extra_info={"user_id": kwargs["user_id"]},
                 )
             )
-            self.text = f"@{self.text}"
+            return self
+        elif entity_type == EntityType.BOLD:
+            prefix = suffix = "*"
+        elif entity_type == EntityType.ITALIC:
+            prefix = suffix = "_"
+        elif entity_type == EntityType.STRIKETHROUGH:
+            prefix = suffix = "~"
+        elif entity_type == EntityType.URL:
+            if kwargs["url"] != self.text:
+                suffix = f" ({kwargs['url']})"
+        elif entity_type == EntityType.PREFORMATTED:
+            prefix = f"```{kwargs['language']}\n"
+            suffix = "\n```"
+        elif entity_type == EntityType.INLINE_CODE:
+            prefix = suffix = "`"
+        elif entity_type == EntityType.BLOCKQUOTE:
+            children = self.trim().split("\n")
+            children = [child.prepend("> ") for child in children]
+            return self.join(children, "\n")
+        elif entity_type == EntityType.HEADER:
+            prefix = "#" * kwargs["size"] + " "
+        else:
+            return self
+
+        self._offset_entities(len(prefix))
+        self.text = f"{prefix}{self.text}{suffix}"
         return self
 
 
@@ -126,8 +153,8 @@ async def matrix_to_kakaotalk(
     else:
         reply_to = None
     if content.get("format", None) == Format.HTML and content["formatted_body"] and content.msgtype.is_text:
-        parsed = await ToKakaoTalkParser().parse(content["formatted_body"])
-        text = parsed.text
+        parsed = await ToKakaoTalkParser().parse(utf16_surrogate.add(content["formatted_body"]))
+        text = utf16_surrogate.remove(parsed.text)
         mentions_by_user: dict[Long, MentionStruct] = {}
         # Make sure to not create remote mentions for any remote user not in the room
         if parsed.entities: