lsp-docker VS lsp-mode

I believe this has cost me a ton of time but I did learn a lot along the way. lsp-docker highest level function is lsp-docker-start. It calls lsp-workspace-root which calls buffer-file-name which, if starting from a dired buffer, returns nil so lsp-workspace-root returns nil and the LSP server is not started.

I'm trying to figure that out right now. There is lsp-docker which is designed (I'm still half guessing) to have a separate container hold the language server. What I want is a pre-existing container to hold the server. There is partial code in that repo to do that but it appears not fully baked.

If you're on WSL, you may want to take a look at something like lsp-docker which bypass all quirk of Tramp and works directly with your files in WSL. I've never been able to make Tramp work reliably (too much hanging with or without lsp-mode) from Windows -> WSL so bypassing it provides a much better experience.

This is a reasonable point, and something that is being worked on. I definitely think Docker can provide LSP servers as necessary, we're just not quite there. This is something that I'm interested in working on, though I'm not the only one: https://github.com/emacs-lsp/lsp-docker

Yeah, I'm a NixOS user, and nix helps a lot with managing LSP servers on my system at the point that this is not a issue for me, but I agree a solution runing then in a docker or something would fit nice as well, we already have this conecpt: https://github.com/emacs-lsp/lsp-docker/

[0] https://github.com/emacs-lsp/lsp-docker#docker-over-tramp-tbd

I also tried to the solutions suggested  and , but nothing worked. I moved the (setq lsp-keymap-...) line outside (and before) use-package. I also used :config (define-key lsp-load-map...) in my use-package block. But none of them worked.

Not sure how much this might help, but lsp-mode has lsp-yaml-select-buffer-schema and lsp-yaml-set-buffer-schema commands to pick schema from a list or set from a URI. Checking the source of them might give some hints about how the same could be implemented in eglot?

Beyond that you might as well embrace the suck and install autex with a language server: https://emacs-lsp.github.io/lsp-mode/

Smart completion these days is done primarily through LSP. eglot is fairly minimal but built-in as of 29, also available via GNU Elpa. lsp-mode is another option with more integrations and a bit more fleshed out.

lsp-mode: https://github.com/emacs-lsp/lsp-mode/issues/2080

Are you running emacs-29? It has numerous speed-ups compared to emacs-28 and older versions, many of them coded by Mattias Engdegård, e.g. commit def6fa4246. I have a fresh build of emacs-29 running on Linux and a new mac with an M1 CPU, and it's stupid fast. I don't use the native-comp feature. I rarely notice any hesitation or slowness. I don't use Elpy. I do use lsp mode.

Since you are doing code development, the first things to go for would be setting up your emacs packaging (installing use-package and melpa (use-package's documentation covers this) so you have more packages to choose from (do be careful to not just pick things willy nilly but research them a bit first)) and then setting up lsp-mode. lsp-mode lets you use LSP servers for the specific programming languages you work with in a somewhat unified fashion. You then need to install and setup the LSP servers for the languages you use, and possibly install language specific Emacs packages as support (note, Emacs has builtin functionality for many).

And first of all, I'm trying to understand, how is it connected to https://github.com/emacs-lsp/lsp-mode? I'm sure, that existed lsp implementations already parse source code. Why TreeSitter?