Won't format files that don't end in `.nu`

[dannyfritz]

Describe the bug

I have a shell command written in nu that has a shebang at the top. I cannot get nufmt to format this file unless I rename it to *.nu or I use the --stdin flag.

nufmt/src/main.rs

Lines 319 to 322 in 3596222

	fn is_nu_file(entry: &DirEntry) -> bool {
	entry.file_type().map(|ft| ft.is_file()).unwrap_or(false)
	&& entry.path().extension().is_some_and(|ext| ext == "nu")
	}

Steps To Reproduce

Steps to reproduce the behavior:

1. Have nu file without the .nu file extension such as my-command
2. Run nufmt my-command
3. Observe error "warning: no Nushell files found under the given path(s)⏎"

Expected behavior

I expect nufmt to format the file because I specified the file on the CLI.

Environment

Please run rustc --version and paste the result.

[user@system:~]$ rustc --version
rustc 1.91.1 (ed61e7d7e 2025-11-07)

[fdncred]

I'm not surprised. nufmt isn't even beta yet and I wouldn't suggest using it. However, we are able to take PRs to help fix problem. I myself use topiary-nushell right now.

[dannyfritz]

I'm not surprised. nufmt isn't even beta yet and I wouldn't suggest using it. However, we are able to take PRs to help fix problem. I myself use topiary-nushell right now.

Thanks. That looks like a really interesting project.

• https://github.com/blindFS/topiary-nushell
• https://github.com/tweag/topiary

[AucaCoyan]

Hey! For completeness, if you format a directory with nufmt, should nufmt check if the shebang of everyfile to see if it needs formatting or not?
This would significantly hit performance if you need to read thousands of files just to format a couple of them

[dannyfritz]

Hey! For completeness, if you format a directory with nufmt, should nufmt check if the shebang of everyfile to see if it needs formatting or not? This would significantly hit performance if you need to read thousands of files just to format a couple of them

The feature could be designed to be disabled with a flag if there is a performance hit for edge cases.

[siph]

Maybe a link to topiary-nushell could be included in the readme warning?