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inducer / pudb

Full-screen console debugger for Python
https://documen.tician.de/pudb/
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Catch IndexError on empty Variables state #653

Closed mvanderkamp closed 5 months ago

mvanderkamp commented 5 months ago

To reproduce:

  1. bash try-the-debugger.sh
  2. Go to the variables pane while it is still empty
  3. Press m or any other command that would ordinarily modify how a variable is displayed.
Traceback ```python python version: 3.11.9 (main, Apr 2 2024, 08:25:04) [Clang 15.0.0 (clang-1500.3.9.4)] pudb version: 2024.1 urwid version: 2...6...1.2 Traceback (most recent call last): File "/Users/mvanderkamp/projects/pudb/pudb/debugger.py", line 2843, in event_loop toplevel.keypress(self.size, k) File "/Users/mvanderkamp/projects/pudb/pudb/ui_tools.py", line 131, in keypress result = self._w.keypress(size, key) ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/mvanderkamp/projects/pudb/venv/lib/python3.11/site-packages/urwid/widget/frame.py", line 526, in keypress return self.body.keypress((maxcol, remaining), key) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/mvanderkamp/projects/pudb/venv/lib/python3.11/site-packages/urwid/widget/widget.py", line 729, in keypress return get_delegate(self).keypress(size, key) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/mvanderkamp/projects/pudb/venv/lib/python3.11/site-packages/urwid/widget/columns.py", line 1216, in keypress key = w.keypress(size_args[i], key) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/mvanderkamp/projects/pudb/pudb/ui_tools.py", line 131, in keypress result = self._w.keypress(size, key) ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/mvanderkamp/projects/pudb/venv/lib/python3.11/site-packages/urwid/widget/pile.py", line 921, in keypress key = self.focus.keypress(size_args[i], key) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/mvanderkamp/projects/pudb/venv/lib/python3.11/site-packages/urwid/widget/widget.py", line 729, in keypress return get_delegate(self).keypress(size, key) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/mvanderkamp/projects/pudb/venv/lib/python3.11/site-packages/urwid/widget/pile.py", line 921, in keypress key = self.focus.keypress(size_args[i], key) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/mvanderkamp/projects/pudb/venv/lib/python3.11/site-packages/urwid/widget/widget.py", line 729, in keypress return get_delegate(self).keypress(size, key) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/mvanderkamp/projects/pudb/pudb/ui_tools.py", line 136, in keypress return handler(self, size, key) ^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/mvanderkamp/projects/pudb/pudb/debugger.py", line 997, in change_var_state pos = self.var_list._w.focus_position ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/mvanderkamp/projects/pudb/venv/lib/python3.11/site-packages/urwid/widget/listbox.py", line 907, in _get_focus_position raise IndexError("No focus_position, ListBox is empty") IndexError: No focus_position, ListBox is empty ```

The fix

Check for an IndexError when reading focus_position. From urwid:

property focus_position the position of child widget in focus. The valid values for this position depend on the list walker in use. IndexError will be raised by reading this property when the ListBox is empty or setting this property to an invalid position.

inducer commented 5 months ago

Thanks!