elixir-ls VS eglot

No. Not even close. But it's getting better.

There are currently two worth mentioning:

ElixirLSP: https://github.com/elixir-lsp/elixir-ls

Elixir tools: https://www.elixir-tools.dev/

ElixirLSP is the older project, and has been around for a while. It does a lot, but has had sporadic issues over the years. Things like the debugger are a dog to get working, and the server itself will occasionally run into issues where it just doesn't want to work. It's always sort of focused on a subset of language server features, so don't expect much in the way of inline corrections. But it's got the essentials, formatting, basic linting, type hinting, on demand documentation, and primitive reference navigation

Elixir tools is a new up and comer, written by Mitchell Hanberg. It's aiming to be a more complete lsp, and has plugins in its "ecosystem" for most editors. Features have been arriving rapidly, starting with things like inline corrections and far more reliable linting, and recently growing autocomplete. One of the main selling points is the elixir-tools backend is a self contained binary, so it can mostly work independent of system Elixir/Erlang version, which was a frequent tripping point for ElixirLSP

Personally I use both at the same time, but plan to move to tools only when it's got all the features I need

I decided I can live without elixir-ls when couching in return for having a usable editor. When the plugin ecosystem and documentation matures I can see myself switching to using Lapce for my primary editor.

Hi! I've compiled gdb from master and installed it. When I run gdb -i dap, I get JSON-RPC, so it looks like it's working, but I'm lost as to where to go from here. Does your change enable me to use a tool like https://github.com/elixir-lsp/elixir-ls with GDB now, right? How might I use them together? What would be required to then have GDB debugging over DAP from inside Emacs?

Elixir-ls provides Language Server Protocol support as well as VS Code Debug Protocol support which gives extra powers to VS Code, NeoVim, Emacs, and the like

https://github.com/elixir-lsp/elixir-ls

BUT, with the news that in the next Emacs version eglot (lsp client) is going to be in the core, I decide to modify alchemist in a different way, enhancing other capabilities and letting eglot do what he best does (which is the functionality of elixir-ls).

I think it's here: https://github.com/elixir-lsp/elixir-ls

elixir-ls powers the VSCode experience, and while it works decently, I've never really clicked with VSCode. In general, for other languages, I tend to use Jetbrain's Products. I would love to give fleet a whirl, and I know in the background it can use the Language Server Protocol to support many of the languages it currently ships with.

Now it doesn't mean that immediately reading this starter guide, you will have everything under the sun set up with Nix Flakes for your development need. But at least, you won't have to worry about setting up asdf, your weird hacks you need for your machine and the other tiny little things to get elixir started with elixir-ls.

I have a minimal lspconfig with coq_nvim with elixirls and tsserver. The problem is that whenever i code on elixir everything becomes slow.

Well I know one extension that runs your code, elixir-ls. I believe it scans your code and runs dialyzer, a static analysis tool, which runs your code and generates types based on it.

Recently I stumbled upon this issue:

https://github.com/joaotavora/eglot/discussions/1127

I don't know enough about emacs and LSP to see the full picture, but it seems that both eglot's and corfu's maintainers, assumably very competent programmers, can't find a solution for this.

I only skimmed the thread. My understanding is that LSP dumps a long list of completion candidates at once and they can't decide a cache strategy that works well with existing code...?

It could be. There are unfixed issues with eglot and corfu, and sadly not a lot of willingness to investigate.

Eglot errors when I add new Python code blocks. The error disappears when I reconnect the language server, but the same happens again when I add a new code block. My "workaround" now is that before I start working on the .qmd file, I just add a bunch of Python code blocks (for which I also have a function) and then reconnect the language server again. This way I can start working for a while until I need to add more code blocks again.

This discussion has helped with some performance issues: https://github.com/joaotavora/eglot/discussions/993.

I guess eglot doesn't support it yet: https://github.com/joaotavora/eglot/pull/839

This is not by pure chance, João is the developer of the Eglot LSP client and the breadcrumbs from LSP-mode had been requested as a feature, but as far as I remember João thought rightfully that this could be an independent package, see https://github.com/joaotavora/eglot/discussions/988

A substantial section of the community is using corfu instead of company, but I wouldn't say company is out of date by any means. In emacs 29 eglot will be a built in, which might act as a replacement for lsp-mode depending on what functionality you need.

I am currently running emacs 29 (built from emacs-29 branch) which – according to https://github.com/joaotavora/eglot – should contain the latest eglot.

Yep. You can use flymake or flycheck for that in combination with eglot or lsp-mode.

See https://github.com/joaotavora/eglot#diagnostics

(I have reported this (that is, ElDoc missing docs for callable things at point, when Eglot is enabled) as an issue recently: First on GitHub-discussions https://github.com/joaotavora/eglot/discussions/1200, then on Debbugs https://debbugs.gnu.org/cgi/bugreport.cgi?bug=62687. But the threads are very long, so I don't recommend reading them.)