Support for mise (previously known as rtx)

[mogest]

Currently, setup-beam supports asdf's .tool-versions file.

A similar tool that is increasing in popularity is mise, previously known as rtx but recently renamed because of the naming conflict with NVIDIA's RTX graphics cards.

mise uses a .mise.toml file which fulfils a similar role to .tool-versions. Here's an example of what one looks like:

[env]
_.file = '.env'
KERL_BUILD_DOCS="yes"

[tools]
elixir = "1.16.0-otp-26"
erlang = "26.2.1"

I'm happy to write a PR to support mise, but wanted to check in with the maintainers to see that it would be a valuable and accepted contribution first.

[paulo-ferraz-oliveira]

👋

Back when we introduced support for .tool-versions our goal was already to try and prepare for future files, which is why you specify version-file - hoping one version file has a given known format, too - like the one you mention.

A pull request to support the [tools] section of that file is welcome 🎉 - within the implemented restrictions (e.g. one version per tool, for example). It does require, though, that we don't break existing consumers, so we need to add a version-file-type input, with asdf being the default (and in case it's not specified we warn about, using GHA's appropriate functions, but don't error out).

So:

1. change is welcome
2. it has to be backward compatible
3. add version-file-type: asdf | mise (asdf being the default)
4. if version-file-type is not specified we warn about it, so consumers can "fix" their input
5. update doc. too

I don't mind reviewing a draft pull request to get you going, or continuing the discussion here before you move to it. 👍

[paulo-ferraz-oliveira]

Detail: unlike .tool-versions, TOML is a "known" config. format, so it's probably best to look at using an existing JS parser instead of doing it like we did 😄

[mogest]

Thanks @paulo-ferraz-oliveira! The one question I was going to ask was whether to hand-roll the parsing or using a toml library, and you've already answered it 🚀

I'll give it a bash over the next few days.

[paulo-ferraz-oliveira]

Related pull request was closed as state. This issue will be too. If there's further interest we can think about continuing the pull request or re-opening this.