Italian Swirls 🍝

Minimal Python language server, based on Jedi and pygls.

Still in development but works on my machine. ✨

Supported features:

LSP method	Description
textDocument/completion	Complete
textDocument/definition	Go to definition
textDocument/typeDefinition	Go to type definition
textDocument/hover	Show documentation
textDocument/references	Show references
textDocument/rename	Renaming symbols and files

Install

You can either clone and build the server package from this repository, or install it from PyPI:

pip install italianswirls

The only dependencies are pygls and Jedi.

Refer to your client documentation on how to setup a server. Yes I have no idea how to do it; to use it in Neovim and its native LSP client, I forked nvim-lspconfig to add my own config file. If it gains attraction I might submit a PR.

Example lspconfig server configuration:

local util = require 'lspconfig.util'
local root_files = { 'pyproject.toml', 'setup.cfg' }

return {
  default_config = {
    cmd = { 'italianswirls' },
    filetypes = { 'python' },
    root_dir = util.root_pattern(unpack(root_files)),
    single_file_support = true,
  },
  docs = {
    description = "Minimal Python language server based on Jedi",
    default_config = {
      root_dir = "vim's starting directory",
    },
  },
}

About

Why?

General-purpose servers (e.g. pyls, py-lsp) try to do too much and break stuff too often for me. Locking Neovim when I press tab, crashes of all kind, LspRestart failing. Also I like my linting and formatting done by dedicated tools such as nvim-lint and formatter.

Other Jedi-based servers (e.g. jedi-language-server) seem to focus on coc-nvim and frequently fail on Neovim's native LSP client for me. I tried to fix jedi-language-server several times when it failed me but I thought it could be fun to try pygls to redo it as small and simple as I can. And running a Node server to get Python completions? No way. That said, jedi-language-server is a good project and if you're fine with coc-nvim you should definitely check it out. Lots of the code here is stolen inspired from this project.

Why the name?

Take the string “Is this a Star Wars reference?” Language Server, compress it to ITASWRLS and expand it back to Italian Swirls. Italian dishes are made of few elements that work well together. Enough questions!

License

GPLv3.