fix: truncate long output

weco/utils.py

@@ -124,6 +124,39 @@ def smooth_update(
 
 
 # Other helper functions
+DEFAULT_MAX_LINES = 50
+DEFAULT_MAX_CHARS = 5000
+
+
+def truncate_output(output: str, max_lines: int = DEFAULT_MAX_LINES, max_chars: int = DEFAULT_MAX_CHARS) -> str:
+    """Truncate the output to a reasonable size."""
+    lines = output.splitlines()
+
+    # Determine what truncations are needed based on original output
+    lines_truncated = len(lines) > max_lines
+    chars_truncated = len(output) > max_chars
+
+    # Apply truncations to the original output
+    if lines_truncated:
+        output = "\n".join(lines[-max_lines:])
+
+    if chars_truncated:
+        output = output[-max_chars:]
+
+    # Add prefixes for truncations that were applied
+    prefixes = []
+    if lines_truncated:
+        prefixes.append(f"truncated to last {max_lines} lines")
+    if chars_truncated:
+        prefixes.append(f"truncated to last {max_chars} characters")
+
+    if prefixes:
+        prefix_text = ", ".join(prefixes)
+        output = f"... ({prefix_text})\n{output}"
+
+    return output
+
+
 def run_evaluation(eval_command: str) -> str:
     """Run the evaluation command on the code and return the output."""
 
@@ -136,7 +169,8 @@ def run_evaluation(eval_command: str) -> str:
         if len(output) > 0:
             output += "\n"
         output += result.stdout
-    return output
+
+    return truncate_output(output)
 
 
 # Update Check Function