Project-wide diagnostic messages in quickfix?

[hoclun-rigsep]

Sorry if this is answered in the docs somewhere but there are a lot of features and using LSPs at all is new to me!

Is it possible to load the quickfix list with diagnostics for all source files in the project, not just the current buffer?

[Konfekt]

This should be possible by using :help :caddexpr.
For example, to merge the location lists of all open buffers into a quickfix list, adapt:

let s:all_locs = []
for bufnr in range(1, bufnr('$'))
    let s:locs = getloclist(bufnr)
    if !empty(s:locs)
        call map(s:locs, {idx, val -> extend(val, {'filename': bufname(bufnr)})})
        let s:all_locs += s:locs
    endif
endfor
call setqflist(s:all_locs)
copen

[hoclun-rigsep]

I'm not expert in LSP but isn't this something the server (or some servers) provide?

[Konfekt]

Neither am I. The information per window or filename is the same, so it seems a matter of taste if one prefers to bundle them or not. But maybe you mean that it lints all files of a certain file type in a directory? I thought of LSP as a protocol to rather apply to opened files than crawling directories

[hoclun-rigsep]

maybe you mean that it lints all files of a certain file type in a directory?

That's what I meant, all files the LSP understands to be source files within a project directory. But:

From dense-analysis/ale#4613 (comment)

4. Note in documentation that Language Server Protocol currently does not offer a way to get a list of all problems for an entire project.

So it looks like your concept of the LSP is right, mine wrong. If I find time I'll play around with your approach above, thanks for the chat @Konfekt