Expose configuration to run only onSave also onEdit

[Tehnix]

From haskell/vscode-haskell#39.

It seems a good idea to be able to expose a configuration that lets a user decide if HIE should run on changes or file saves. It seems onDidSave got implemented in version 2.x of LSP, and a usage of it can be found here microsoft/vscode-tslint@fdc7748.

I'm not really sure how the passing of configurations currently happen from the clients to HIE though? I've seen mention of .clientrc in the vscode client code, but no docs on what format or settings it supports.

[lorenzo]

I'd like to implement this. I'm finding it increasingly annoying to have diagnostics as I type.

Additionally I think that this diagnostics on save should be the default, it would make things feel more snappy in general. How do you guys think I should go about this?

[mpickering]

@lorenzo I also support this. Including the part about the default.

[mpickering]

@lorenzo Did you make any progress yet? I want to disable the on edit functionality on my branch.

[mpickering]

I implemented the necessary parts in the backend to make this configurable on my branch.

mpickering@a5fcf53

If someone wants to upstream this then the UI parts need to be added to the plugin but I'm not going to do that immediately.

[lorenzo]

@mpickering I did not, was busy with work this week. Do you plan on opening a pull request with your changes?

[mpickering]

No I don't plan to but the commit is there if someone who knows how to modify the front end to expose this setting.