feat: review assigned pull diffs before merge (#187)

src/gitea_proxy.py

@@ -842,11 +842,16 @@ async def pull_completion_detail(repository: str, number: int) -> dict:
         raise ValueError("Gitea pull request response was not an object")
     head = pull.get("head") if isinstance(pull.get("head"), dict) else {}
     sha = head.get("sha") if isinstance(head.get("sha"), str) else ""
-    files, status, comments = await asyncio.gather(
+    files, status, comments, diff_result = await asyncio.gather(
         fetch(f"{base}/files"),
         fetch(f"repos/{repository}/commits/{sha}/status"),
         fetch(f"repos/{repository}/issues/{number}/comments?limit=20&page=1"),
+        fetch_text(
+            f"repos/{repository}/pulls/{number}.diff", REVIEW_DIFF_MAX_BYTES
+        ),
     )
+    diff, diff_truncated = diff_result
+    previews = _diff_previews(diff, diff_truncated)
     user = pull.get("user") if isinstance(pull.get("user"), dict) else {}
     return {
         "repository": repository,
@@ -867,6 +872,15 @@ async def pull_completion_detail(repository: str, number: int) -> dict:
                 "status": item.get("status") or "changed",
                 "additions": item.get("additions") or 0,
                 "deletions": item.get("deletions") or 0,
+                **previews.get(
+                    item["filename"],
+                    {
+                        "diff_lines": [],
+                        "diff_available": False,
+                        "diff_binary": False,
+                        "diff_truncated": diff_truncated,
+                    },
+                ),
             }
             for item in (files if isinstance(files, list) else [])[:100]
             if isinstance(item, dict) and isinstance(item.get("filename"), str)