Override diagnostic severity for a specific source

[doums]

There is a way to override the diagnostic severity for a specific source ?

For example, I tried to use cspell source. It works great but reports all unknown words like lowecase names as errors, and this might produce a really disturbing massive redish output in source code. The solution would be to have the diagnostics reported by cspell source (including those false positive errors) to be reported as information or hint diagnostic.

So it could be really great to have the possibility to transform the diagnostic severity for a specific source. Maybe this is already the case ?

[jose-elias-alvarez]

Unfortunately we don't handle this case currently. Broadly speaking, we don't have a way for users to customize what sources do with their output. It's something I want to think about more, but short of making built-ins into a class (which is sensible, but would break existing configs) I can't think of a good solution right now.

In the meantime, we could expose default_severity as an option. At the moment, all unspecified severities fall back to error, which is what you are seeing with cspell, but we could allow users to configure it. Would that help?

[fragov]

@jose-elias-alvarez that would help a lot.

[jose-elias-alvarez]

@fragov I added a fallback_severity option in 567daff and confirmed that it's working with cspell.

[fragov]

@jose-elias-alvarez, thanks, it works great

[doums]

@jose-elias-alvarez Ok I see, based on that sure, default_severity is a good solution for the moment. Thanks !

[pseudogram]

This has been solved now.

In my case I wanted to override the diagnostic severity of cspell, going from error to hint.

local null_ls = require("null-ls")
null_ls.setup({
  sources = {
    null_ls.builtins.diagnostics.cspell.with({
      -- Force the severity to be HINT
      diagnostics_postprocess = function(diagnostic)
        diagnostic.severity = vim.diagnostic.severity.HINT
      end,
    }),
  }
})

Credit:
u/rjooske