fix(feishu): harden fenced post row splitting

gateway/platforms/feishu.py

@@ -119,6 +119,8 @@ _MARKDOWN_HINT_RE = re.compile(
     re.MULTILINE,
 )
 _MARKDOWN_LINK_RE = re.compile(r"\[([^\]]+)\]\(([^)]+)\)")
+_MARKDOWN_FENCE_OPEN_RE = re.compile(r"^```([^\n`]*)\s*$")
+_MARKDOWN_FENCE_CLOSE_RE = re.compile(r"^```\s*$")
 _MENTION_RE = re.compile(r"@_user_\d+")
 _MULTISPACE_RE = re.compile(r"[ \t]{2,}")
 _POST_CONTENT_INVALID_RE = re.compile(r"content format of the post type is incorrect", re.IGNORECASE)
@@ -445,9 +447,9 @@ def _build_markdown_post_rows(content: str) -> List[List[Dict[str, str]]]:
     """Build Feishu post rows while isolating fenced code blocks.
 
     Feishu's `md` renderer can swallow trailing content when a fenced code block
-    appears inside one large markdown element. Splitting the reply at code
-    fences preserves the surrounding markdown while keeping the code block in a
-    dedicated row.
+    appears inside one large markdown element. Split the reply at real fence
+    lines so prose before/after the code block remains visible while code stays
+    in a dedicated row.
     """
     if not content:
         return [[{"tag": "md", "text": ""}]]
@@ -458,32 +460,35 @@ def _build_markdown_post_rows(content: str) -> List[List[Dict[str, str]]]:
     current: List[str] = []
     in_code_block = False
 
+    def _flush_current() -> None:
+        nonlocal current
+        if not current:
+            return
+        segment = "\n".join(current)
+        if segment.strip():
+            rows.append([{"tag": "md", "text": segment}])
+        current = []
+
     for raw_line in content.splitlines():
-        line = raw_line.rstrip()
-        is_fence = line.strip().startswith("```")
+        stripped_line = raw_line.strip()
+        is_fence = bool(
+            _MARKDOWN_FENCE_CLOSE_RE.match(stripped_line)
+            if in_code_block
+            else _MARKDOWN_FENCE_OPEN_RE.match(stripped_line)
+        )
 
         if is_fence:
-            if not in_code_block and current:
-                segment = "\n".join(current).strip()
-                if segment:
-                    rows.append([{"tag": "md", "text": segment}])
-                current = []
-            current.append(line)
+            if not in_code_block:
+                _flush_current()
+            current.append(raw_line)
             in_code_block = not in_code_block
             if not in_code_block:
-                segment = "\n".join(current).strip()
-                if segment:
-                    rows.append([{"tag": "md", "text": segment}])
-                current = []
+                _flush_current()
             continue
 
-        current.append(line)
-
-    if current:
-        segment = "\n".join(current).strip()
-        if segment:
-            rows.append([{"tag": "md", "text": segment}])
+        current.append(raw_line)
 
+    _flush_current()
     return rows or [[{"tag": "md", "text": content}]]
 
 

tests/gateway/test_feishu.py

@@ -2433,6 +2433,48 @@ class TestAdapterBehavior(unittest.TestCase):
             ],
         )
 
+    @patch.dict(os.environ, {}, clear=True)
+    def test_build_post_payload_keeps_fence_like_code_lines_inside_code_block(self):
+        from gateway.config import PlatformConfig
+        from gateway.platforms.feishu import FeishuAdapter
+
+        adapter = FeishuAdapter(PlatformConfig())
+        payload = json.loads(
+            adapter._build_post_payload(
+                "before\n```python\n```oops\n```\nafter"
+            )
+        )
+
+        self.assertEqual(
+            payload["zh_cn"]["content"],
+            [
+                [{"tag": "md", "text": "before"}],
+                [{"tag": "md", "text": "```python\n```oops\n```"}],
+                [{"tag": "md", "text": "after"}],
+            ],
+        )
+
+    @patch.dict(os.environ, {}, clear=True)
+    def test_build_post_payload_preserves_trailing_spaces_in_code_block(self):
+        from gateway.config import PlatformConfig
+        from gateway.platforms.feishu import FeishuAdapter
+
+        adapter = FeishuAdapter(PlatformConfig())
+        payload = json.loads(
+            adapter._build_post_payload(
+                "before\n```python\nline with two spaces  \n```\nafter"
+            )
+        )
+
+        self.assertEqual(
+            payload["zh_cn"]["content"],
+            [
+                [{"tag": "md", "text": "before"}],
+                [{"tag": "md", "text": "```python\nline with two spaces  \n```"}],
+                [{"tag": "md", "text": "after"}],
+            ],
+        )
+
     @patch.dict(os.environ, {}, clear=True)
     def test_send_falls_back_to_text_when_post_payload_is_rejected(self):
         from gateway.config import PlatformConfig