prettier-plugin-sh: support .nvmrc files?

[JoshuaKGoldberg]

Coming over here from prettier/prettier#15898 (comment): I'd like to use prettier-plugin-sh to format .nvmrc files. Given that the plugin supports similar files (gitignore, dotenv, ...), is this a reasonable use case for the plugin?

[JounQin]

Is there a .nvmrc spec?

Or at least some example so that we can add some test cases?

[JoshuaKGoldberg]

I don't think there's a formal spec, no. Parsing of .nvmrc comes from commands in https://github.com/nvm-sh/nvm/blob/6c9cd2f2d1779b91c0ab7ab0b243c0c55f25a8a5/nvm.sh. Filed nvm-sh/nvm#3265.

For now, node -v is the rough format it uses: an optional v, a number, then 0-1 of . and more numbers.

• 20
• v20
• v20.1
• v20.12
• v20.1.2
• v20.1.23
• v20.1.234
• v20.12.2
• v20.12.34
• v20.12.345

Trailing whitespace and/or newlines seem to be fine as well.

https://github.com/JoshuaKGoldberg/create-typescript-app/blob/c91ce25e556f67ea321cd0df260a08569e71d8f8/.nvmrc is an example of a working file.

20.11.0

[JounQin]

I'm not for sure to understand the user case here, this file is already lean enough to me? Is there any chance that can be not pretty?

[JoshuaKGoldberg]

Extra newlines after the version are allowed:

20.11.0

Playing around with it a bit more, it looks like whitespace on the same line are being parsed as the version number. So those can't be removed. But the following are ignored:

• Presence or lack of v
• Any text after a newline following the version number

So this is actually a totally valid .nvmrc:

20.11.0

...gotcha!

...now that I've played with this a bit more, maybe it deserves its own plugin?

[JounQin]

...now that I've played with this a bit more, maybe it deserves its own plugin?

🤣 Still don't quite understand what's the text after first line does.

20.11.0

...gotcha!

It's just valid, but not useful at all? Is there anyone really doing this?

[JoshuaKGoldberg]

Haha yeah it's just ignored. I've never seen it in the wild and didn't even think to try it out until after we started talking!

[JounQin]

If you only want to trim, I think maybe it could be added, with a reference doc. Would you like to raise a PR?