Add formatters for Elm, Haskell, Python, and TypeScript

[heyakyra]

This commit adds elm-format for Elm, ormolu for Haskell, ruff for Python, and prettier for TypeScript, Javascript, TSX, JSX, etc.

[David-Else]

I am not sure making biome default for the JavaScript family is a good idea, the real standard is Prettier, and that does a whole load of other languages too. The only problem with Prettier as an amazing default is it is a bit slow, but that is changing soon and Prettier 4 will be much faster, so it will definitely be the best default then: https://prettier.io/blog/2023/11/30/cli-deep-dive

[NikitaRevenco]

I am not sure making biome default for the JavaScript family is a good idea, the real standard is Prettier, and that does a whole load of other languages too. The only problem with Prettier as an amazing default is it is a bit slow, but that is changing soon and Prettier 4 will be much faster, so it will definitely be the best default then: https://prettier.io/blog/2023/11/30/cli-deep-dive

In the meantime use prettierd

[darshanCommits]

I am not sure making biome default for the JavaScript family is a good idea, the real standard is Prettier

I personally use biome but this is correct. Prettier maybe slow but as it stands, it's the de facto standard.

Plus last I checked status of biome it wasn't fully compatible with prettier.

[heyakyra]

Hm, I figured people are swinging towards Biome, and it would be better to set it as the default given there is none set now than to use Prettier and swap it out later. As of last year when they won the Prettier challenge, Biome had already hit 96% compatibility with Prettier.

I updated the PR since I appear to be the outlier here.

[RoloEdits]

I think there are too many alternatives for some of these to make these the formatters for the languages. For example I use ruff over black and deno fmt over the alternatives right now.

[heyakyra]

These are simply defaults not 'the' formatters. Helix differs from other editors by providing nice defaults rather than leaving a completely blank slate for the user to deal with. Users that have a different preference can set their own, as I and others will do for biome, deno, etc.

[NikitaRevenco]

These are simply defaults not 'the' formatters. Helix differs from other editors by providing nice defaults rather than leaving a completely blank slate for the user to deal with. Users that have a different preference can set their own, as I and others will do for biome, deno, etc.

I will even add that it would be nice for helix to configure multiple formatters, if it makes sense for the language

So there will be a default one, but switching to another is just one line of config

[David-Else]

If defaults are necessary, they should align with the most widely used formatter. In this case, Prettier is the clear choice, as it is already installed by the majority of users.

[heyakyra]

@NikitaRevenco commented:

It would be nice for helix to configure multiple formatters, if it makes sense for the language

So there will be a default one, but switching to another is just one line of config

The documentation specifies how to add a local languages.toml file, but I added comments to the root file in this PR to assist.

@David-Else commented:

defaults […] should align with the most widely used formatter. In this case, Prettier…

This was included in the first update to the PR a couple of days ago.

[David-Else]

The command to use Prettier for JS/TS is formatter = { command = 'prettier', args = ["--parser", "typescript"] }. Please test your PR.

[NikitaRevenco]

If you want to make a default formatter for typescript and it will be prettier, can you use prettierd?

It's significantly faster than prettier and provides zero downsides, from my experience

[heyakyra]

Happy to do that if you think it's still worthwhile despite the next version of prettier being much faster as you said. But how does one pass the --parser option to prettierd?

[David-Else]

If you want to make a default formatter for typescript and it will be prettier, can you use prettierd?

It's significantly faster than prettier and provides zero downsides, from my experience

I vote for Prettier for the reasons I explained previously.

[NikitaRevenco]

If you want to make a default formatter for typescript and it will be prettier, can you use prettierd?

It's significantly faster than prettier and provides zero downsides, from my experience

I vote for Prettier for the reasons I explained previously.

what about prettierd but fallback to prettier if prettierd isn't found? If this is possible

[David-Else]

what about prettierd but fallback to prettier if prettierd isn't found? If this is possible

I don't think so.

[NikitaRevenco]

what about prettierd but fallback to prettier if prettierd isn't found? If this is possible

I don't think so.

Ok, then I agree that prettier is better as its more likely to be installed on people's computera

Users who want speed can configure prettierd themselves

especially since new prettier versions will be faster

[heyakyra]

Thanks for all the feedback. Let me know if there is anything left outstanding