nvim-lspconfig/CONTRIBUTING.md

## Requirements

- [Lint requirements](#lint)
- Documentation is generated by `scripts/docgen.lua`.
  - Only works on linux and macOS

## Scope of nvim-lspconfig

The point of lspconfig is to provide the minimal configuration necessary for a server to act in compliance with the language server protocol. In general, if a server requires custom client-side commands or off-spec handlers, then the server configuration should be added *without* those in lspconfig and receive a dedicated plugin such as nvim-jdtls, nvim-metals, etc.

## Pull requests (PRs)

- Mark your pull request as "draft" until it's ready for review.
- Avoid cosmetic changes to unrelated files in the same commit.
- Use a **rebase workflow** for small PRs.
  - After addressing review comments, it's fine to rebase and force-push.

## Adding a server to lspconfig

To add a new language server, start with a minimal skeleton. See `:help lspconfig-new`.

When choosing a config name, convert dashes (`-`) to underscores (`_`). If the name of the server is a unique name (`pyright`, `clangd`) or a commonly used abbreviation (`zls`), prefer this as the server name. If the server instead follows the pattern x-language-server, prefer the convention `x_ls` (`jsonnet_ls`). 

Populate the `config` table with a `default_config` and `docs` table.

`default_config` should include at minimum:

* `cmd`: a list which includes the executable name as the first entry, with arguments constituting subsequent list elements (`--stdio` is common).
  ```lua
  cmd = { 'typescript-language-server', '--stdio' }
  ```
* `filetypes`: list of filetypes that should activate this config.
* `root_dir`: function which returns the root of the project, used to decide if lspconfig should launch a new language server, or attach a previously launched server when you open a new buffer matching the filetype of the server.
    * See `:help lspconfig-new`.
    * See `vim.fs.root()`
    * Do not use `vim.fn.cwd` or `util.path.dirname`.

Additionally, these options are often useful:

* `init_options`: table sent during initialization, corresponding to `initializationOptions` sent in [initializeParams](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#initializeParams) as part of the first request sent from client to server during startup.
* `settings`: table sent during [`workspace/didChangeConfiguration`](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#didChangeConfigurationParams) shortly after server initialization. This is an undocumented convention for most language servers. There is often some duplication with `initOptions`.

An example for adding a new config is shown below:

```lua
local util = require 'lspconfig.util'

local function organize_imports()
  local params = {
    command = 'pyright.organizeimports',
    arguments = { vim.uri_from_bufnr(0) },
  }
  vim.lsp.buf.execute_command(params)
end

return {
  default_config = {
    cmd = { 'pyright-langserver', '--stdio' },
    filetypes = { 'python' },
    root_dir = util.root_pattern(
      'pyproject.toml',
      'setup.py',
      'setup.cfg',
      'requirements.txt',
      'Pipfile',
      'pyrightconfig.json',
    ),
    single_file_support = true,
    settings = {
      python = {
        analysis = {
          autoSearchPaths = true,
          useLibraryCodeForTypes = true,
          diagnosticMode = 'workspace',
        },
      },
    },
  },
  commands = {
    PyrightOrganizeImports = {
      organize_imports,
      description = 'Organize Imports',
    },
  },
  docs = {
    description = [[
https://github.com/microsoft/pyright

`pyright`, a static type checker and language server for python
]],
  },
}
```

## Commit style

Follow the Neovim core [commit message guidelines](https://github.com/neovim/neovim/blob/master/CONTRIBUTING.md#commit-messages). Examples:

* Adding a new config for "lua-language-server":
  ```
  feat: lua-language-server
  ```
* Fixing a bug for "lua-language-server":
  ```
  fix(lua-language-server): update root directory pattern

  Problem:
  Root directory incorrectly prefers "foo".

  Solution:
  Rearrange the root dir definition.
  ```

## Lint

PRs are checked with the following software:
- [luacheck](https://github.com/luarocks/luacheck#installation)
- [stylua](https://github.com/JohnnyMorganz/StyLua).
- [selene](https://github.com/Kampfkarren/selene)

To run the linter locally:

    make lint

If using nix, you can use `nix develop` to install these to a local nix shell.

## Generating docs

GitHub Actions automatically generates `server_configurations.md`. Only modify
`scripts/README_template.md` or the `docs` table in the server config Lua file.
Do not modify `server_configurations.md` directly.

To preview the generated `server_configurations.md` locally, run `scripts/docgen.lua` from
`nvim` (from the project root):

    nvim -R -Es +'set rtp+=$PWD' +'luafile scripts/docgen.lua'