An empty OptionList with width: auto causes a crash in get_content_width

[davep]

This code:

from textual.app import App, ComposeResult
from textual.widgets import OptionList

class OptionListAutoCrash(App[None]):

    CSS = """
    OptionList {
        width: auto;
    }
    """

    def compose(self) -> ComposeResult:
        yield OptionList()

if __name__ == "__main__":
    OptionListAutoCrash().run()

results in this crash:

│ /Users/davep/temp/x/.venv/lib/python3.13/site-packages/textual/widgets/_option_list.py:396 in get_content_width                                       │
│                                                                                                                                                       │
│    393 │   │   """Get maximum width of options."""                                                                                                    │
│    394 │   │   console = self.app.console                                                                                                             │
│    395 │   │   options = console.options                                                                                                              │
│ ❱  396 │   │   return max(                                                                                                                            │
│    397 │   │   │   Measurement.get(console, options, option.prompt).maximum                                                                           │
│    398 │   │   │   for option in self._options                                                                                                        │
│    399 │   │   )                                                                                                                                      │
│                                                                                                                                                       │
│ ╭─────────────────────────── locals ────────────────────────────╮                                                                                     │
│ │   console = <console width=153 ColorSystem.TRUECOLOR>         │                                                                                     │
│ │ container = Size(width=149, height=66)                        │                                                                                     │
│ │   options = ConsoleOptions(                                   │                                                                                     │
│ │             │   size=ConsoleDimensions(                       │                                                                                     │
│ │             │   │   width=153,                                │                                                                                     │
│ │             │   │   height=68                                 │                                                                                     │
│ │             │   ),                                            │                                                                                     │
│ │             │   legacy_windows=False,                         │                                                                                     │
│ │             │   min_width=1,                                  │                                                                                     │
│ │             │   max_width=153,                                │                                                                                     │
│ │             │   is_terminal=True,                             │                                                                                     │
│ │             │   encoding='utf-8',                             │                                                                                     │
│ │             │   max_height=68,                                │                                                                                     │
│ │             │   justify=None,                                 │                                                                                     │
│ │             │   overflow=None,                                │                                                                                     │
│ │             │   no_wrap=False,                                │                                                                                     │
│ │             │   highlight=None,                               │                                                                                     │
│ │             │   markup=None,                                  │                                                                                     │
│ │             │   height=None                                   │                                                                                     │
│ │             )                                                 │                                                                                     │
│ │      self = OptionList()                                      │                                                                                     │
│ │  viewport = Size(width=153, height=68)                        │                                                                                     │
│ ╰───────────────────────────────────────────────────────────────╯                                                                                     │
╰───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
ValueError: max() iterable argument is empty

Textual Diagnostics

Versions

Name	Value
Textual	1.0.0
Rich	13.9.4

Python

Name	Value
Version	3.13.1
Implementation	CPython
Compiler	Clang 16.0.0 (clang-1600.0.26.4)
Executable	/Users/davep/temp/x/.venv/bin/python

Operating System

Name	Value
System	Darwin
Release	24.2.0
Version	Darwin Kernel Version 24.2.0: Fri Dec 6 18:51:28 PST 2024; root:xnu-11215.61.5~2/RELEASE_ARM64_T8112

Terminal

Name	Value
Terminal Application	ghostty (1.0.1)
TERM	xterm-256color
COLORTERM	truecolor
FORCE_COLOR	Not set
NO_COLOR	Not set

Rich Console options

Name	Value
size	width=153, height=68
legacy_windows	False
min_width	1
max_width	153
is_terminal	False
encoding	utf-8
max_height	68
justify	None
overflow	None
no_wrap	False
highlight	None
markup	None
height	None