[BUG] no lexer for filename 'xxx' found

Describe the bug At the top of the tracebacks for my tool on exceptions I’m getting the following (see this GitHub Actions workflow):

╭───────────────────── Traceback (most recent call last) ──────────────────────╮
│ /opt/hostedtoolcache/Python/3.7.9/x64/bin/nf-core:8 in <module>              │
│                                                                              │
│ no lexer for filename 'nf-core' found                                        │

Alternatively, if testing locally:

╭─────────────────────── Traceback (most recent call last) ───────────────────────╮
│ /Users/ewels/miniconda3/envs/py3/bin/nf-core:33 in <module>                     │
│                                                                                 │
│ no lexer for filename 'nf-core' found                                           │

Syntax highlighting in the traceback does work correctly locally.

To Reproduce Any traceback from https://github.com/nf-core/tools has this warning. To test locally I added an assert False statement here and ran nf-core list.

Platform Linux (GitHub Actions), Mac OSX (locally).

Diagnose

python -m rich.diagnose

❯ python -m rich.diagnose
╭────────────────────────────────────────────────────────── <class 'rich.console.Console'> ───────────────────────────────────────────────────────────╮
│ A high level console interface.                                                                                                                     │
│                                                                                                                                                     │
│ ╭─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮ │
│ │ <console width=151 ColorSystem.TRUECOLOR>                                                                                                       │ │
│ ╰─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯ │
│                                                                                                                                                     │
│     color_system = 'truecolor'                                                                                                                      │
│         encoding = 'utf-8'                                                                                                                          │
│             file = <_io.TextIOWrapper name='<stdout>' mode='w' encoding='UTF-8'>                                                                    │
│ is_dumb_terminal = False                                                                                                                            │
│       is_jupyter = False                                                                                                                            │
│      is_terminal = True                                                                                                                             │
│   legacy_windows = False                                                                                                                            │
│         no_color = False                                                                                                                            │
│          options = ConsoleOptions(legacy_windows=False, min_width=1, max_width=151, is_terminal=True, encoding='utf-8', justify=None,               │
│                    overflow=None, no_wrap=False, highlight=None)                                                                                    │
│           record = False                                                                                                                            │
│         safe_box = True                                                                                                                             │
│             size = ConsoleDimensions(width=151, height=43)                                                                                          │
│        soft_wrap = False                                                                                                                            │
│           stderr = False                                                                                                                            │
│            style = None                                                                                                                             │
│         tab_size = 8                                                                                                                                │
│            width = 151                                                                                                                              │
╰─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯

python -m rich._windows

 ❯ python -m rich._windows
platform="Darwin"
WindowsConsoleFeatures(vt=False, truecolor=False)

pip freeze | grep rich

 ❯ pip freeze | grep rich
rich==9.10.0

[willmcgugan]

Should be fixed in 9.11.0

[willmcgugan]

I guess you could also look at the file hashbang if present? But probably not super precise either.

True, if the first line starts with hash bang and contains the text “python” assume a Python lexer, otherwise plain text. Seems like a reasonable approach.