Avoid errors when the first element is longer than the truncation index

1 files changed, 10 insertions, 3 deletions

diff --git a/bot/exts/info/doc/_parsing.py b/bot/exts/info/doc/_parsing.py
index 45a81a4cb..0251b0105 100644
--- a/bot/exts/info/doc/_parsing.py
+++ b/bot/exts/info/doc/_parsing.py
@@ -195,9 +195,16 @@ def _get_truncated_description(
         return result
 
     # Determine the actual truncation index.
-    # Truncate at the last Markdown element that comes before the truncation index.
-    markdown_truncate_index = max(cut for cut in markdown_element_ends if cut < truncate_index)
-    return result[:markdown_truncate_index].strip(_TRUNCATE_STRIP_CHARACTERS) + "..."
+    possible_truncation_indices = [cut for cut in markdown_element_ends if cut < truncate_index]
+    if not possible_truncation_indices:
+        # In case there is no Markdown element ending before the truncation index, use shorten as a fallback.
+        truncated_result = textwrap.shorten(result, truncate_index)
+    else:
+        # Truncate at the last Markdown element that comes before the truncation index.
+        markdown_truncate_index = max(possible_truncation_indices)
+        truncated_result = result[:markdown_truncate_index]
+
+    return truncated_result.strip(_TRUNCATE_STRIP_CHARACTERS) + "..."
 
 
 def _create_markdown(signatures: Optional[List[str]], description: Iterable[Tag], url: str) -> str: