From e9668855c2af6eb41a8be343b476bffb338e0424 Mon Sep 17 00:00:00 2001
From: elkoled <koepping.daniel@gmail.com>
Date: Fri, 29 May 2026 16:11:14 -0700
Subject: [PATCH] car_diff: show unique errors in a dropdown

A broken carcontroller fails every segment with the same traceback,
spamming the report. Print each unique error once inside a dropdown.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---
 opendbc/car/tests/car_diff.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/opendbc/car/tests/car_diff.py b/opendbc/car/tests/car_diff.py
index b4424be8975..37d82314056 100755
--- a/opendbc/car/tests/car_diff.py
+++ b/opendbc/car/tests/car_diff.py
@@ -293,8 +293,11 @@ def main(platform: str | None = None, segments_per_platform: int = 10, update_re
   icon = "⚠️" if with_diffs else "✅"
   print(f"\n{icon}  {len(with_diffs)} changed, {n_passed} passed, {len(errors)} errors")
 
-  for plat, seg, err in errors:
-    print(f"\nERROR {plat} - {seg}: {err}")
+  if errors:
+    print("<details><summary><b>Show errors</b></summary>\n\n```")
+    for err in dict.fromkeys(err for _, _, err in errors):
+      print(f"\n{err}")
+    print("```\n</details>")
 
   if with_diffs:
     print("<details><summary><b>Show changes</b></summary>\n\n```")