GHC development with VSCode

[Benjamin Maurer]

Hi Richard,

great to hear, I've also seen a tweet about new videos from you using VS
code (had no time to watch yet).
Hope that more adoption improves things!

So, I've been using VS Code for almost a year now and I have seen great
improvements - almost all of that is the Haskell LSP.

"processing" and "indexing" may be (at least the former?) the LSP, I guess?
I have head single instances where it went haywire and I had to do a hard
reset of my machine,
but generally I can work with VS code and LSP doing it's thing (Laptop with
Ryzen 4700U & 16 GB RAM).

You can hit Ctrl+Shift+P for the command HUD and type "Haskell" - this
gives you the options to stop and (re-)start the LSP.
The latter can help when it becomes sluggish.

In File -> Preferences -> Settings search for "Haskell", there you have the
option to turn off things, e.g., "Haskell: Diagnostics on Change" (turning
off will create diagnostics only when you save).

Hope that helps.

Cheers,
Ben

Am Mo., 20. Sept. 2021 um 17:29 Uhr schrieb Richard Eisenberg <
lists at richarde.dev>:

> Hi devs,
>
> I have migrated to use VSCode instead of emacs. There are the usual
> switchover pains, but I'm mostly pleased. One particular point of pleasure
> was that I had to do nothing, at all, to get VSCode working within the GHC
> code base. (Well, I had to switch to Hadrian, but perhaps that's for the
> best.)
>
> My problem: VSCode over GHC pins my processor at 100% if I edit anything.
> Any advice for fixing this?
>
> A little more detail: When VSCode starts up, it spends a while
> "processing" and "indexing" (no idea what these mean). OK. I can pay that
> one-time cost. But as I start editing, etc., it needs to process and index
> a lot more. Somewhat continuously. This slows my computer down generally,
> and -- more annoyingly -- slows down my builds (run in a separate terminal).
>
> I understand why VSCode wants to do this: it's checking my code for
> errors, etc. But is there a way to say "not now, please"? More
> specifically: I'd like to stop VSCode from detecting errors in my code
> while I'm actively editing. It's just too slow. On the other hand, it would
> be brilliant if VSCode could continue to allow me to, say, jump to
> definitions and gather references, using its latest knowledge of the code.
> As I edit, I understand this "latest knowledge" may become stale, if I'm
> stopping VSCode from reprocessing and reindexing. So, it would be nice to
> be able to tell VSCode to refresh, when I want that.
>
> Any pointers here?
> https://gitlab.haskell.org/ghc/ghc/-/wikis/Visual-Studio-Code would be a
> good place to put them!
>
> Thanks,
> Richard
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