nvim-lspconfig

Collection of common configurations for the Nvim LSP client.

Best-effort, unsupported

The configurations here are strictly best effort and unsupported.

This repo is (1) a place for Nvim LSP users to collaboratively provide starting examples for the many LSP backends out there, and (2) a reference for the current best practice (or most popular) regarding choice of server, setup, etc.

Requires Nvim 0.5 HEAD

While Nvim LSP undergoes development, the configs in this repo assume that you are using the latest Nvim HEAD/nightly build.

Update Nvim and nvim-lspconfig before reporting an issue.

Contributions

It's up to you to send improvements so that these configs align with current best practices for a given language.

Read CONTRIBUTING.md. Ask questions in Neovim Gitter.
Choose a language from the coc.nvim wiki or emacs-lsp.
Create a new file at lua/lspconfig/SERVER_NAME.lua.
- Copy an existing config to get started. Most configs are simple. For an extensive example see texlab.lua.

Install

Requires Nvim HEAD/nightly (v0.5 prerelease).
nvim-lspconfig is just a plugin. Install it like any other Vim plugin, e.g. with vim-plug:
```
:Plug 'neovim/nvim-lspconfig'
```
Call :packadd nvim-lspconfig in your vimrc if you installed nvim-lspconfig to 'packpath' or if you use a package manager such as minpac.

Usage

Each config provides a setup() function, to initialize the server with reasonable defaults and some server-specific things like commands or different diagnostics.

vim.cmd('packadd nvim-lspconfig')  -- If installed as a Vim "package".
require'lspconfig'.<config>.setup{name=…, settings = {…}, …}

If you want to add this to your vimrc, you will need to enclose it in a lua block.

lua <<EOF
vim.cmd('packadd nvim-lspconfig')  -- If installed as a Vim "package".
require'lspconfig'.<config>.setup{name=…, settings = {…}, …}
EOF

Find the config for your language, then paste the example given there to your init.vim. All examples are given in Lua, see :help :lua-heredoc to use Lua from your init.vim.

Some configs may define additional server-specific functions, e.g. the texlab config provides lspconfig.texlab.buf_build({bufnr}).

If you want to see the location of log file, you can run this in neovim:

:lua print(vim.lsp.get_log_path())

Example: using the defaults

To use the defaults, just call setup() with an empty config parameter. For the gopls config, that would be:

vim.cmd('packadd nvim-lspconfig')  -- If installed as a Vim "package".
require'lspconfig'.gopls.setup{}

Example: override some defaults

To set some config properties at setup(), specify their keys. For example to change how the "project root" is found, set the root_dir key:

local lspconfig = require'lspconfig'
lspconfig.gopls.setup{
  root_dir = lspconfig.util.root_pattern('.git');
}

The documentation for each config lists default values and additional optional properties.

local lspconfig = require'lspconfig'
lspconfig.texlab.setup{
  name = 'texlab_fancy';
  log_level = vim.lsp.protocol.MessageType.Log;
  message_level = vim.lsp.protocol.MessageType.Log;
  settings = {
    latex = {
      build = {
        onSave = true;
      }
    }
  }
}

Example: custom config

To configure a custom/private server, just require lspconfig/configs and do the same as we do if we were adding it to the repository itself.

Define the config: configs.foo_lsp = { … }
Call setup(): require'lspconfig'.foo_lsp.setup{}

local lspconfig = require'lspconfig'
local configs = require'lspconfig/configs'
-- Check if it's already defined for when I reload this file.
if not lspconfig.foo_lsp then
  configs.foo_lsp = {
    default_config = {
      cmd = {'/home/ashkan/works/3rd/lua-language-server/run.sh'};
      filetypes = {'lua'};
      root_dir = function(fname)
        return lspconfig.util.find_git_ancestor(fname) or vim.loop.os_homedir()
      end;
      settings = {};
    };
  }
end
lspconfig.foo_lsp.setup{}

Example: override default config

If you want to change default configs for all servers, you can override default_config like this.

local lspconfig = require'lspconfig'
lspconfig.util.default_config = vim.tbl_extend(
  "force",
  lspconfig.util.default_config,
  { log_level = lsp.protocol.MessageType.Warning.Error }
)

Installing a language server

Configs may provide an install() function. Then you can use :LspInstall {name} to install the required language server. For example, to install the Elm language server:

:LspInstall elmls

Use :LspInstallInfo to see install info.

:LspInstallInfo

setup() function

The setup() interface:

lspconfig.SERVER.setup{config}

  The `config` parameter has the same shape as that of
  |vim.lsp.start_client()|, with these additions and changes:

  {root_dir}
    Required for some servers, optional for others.
    Function of the form `function(filename, bufnr)`.
    Called on new candidate buffers being attached-to.
    Returns either a root_dir or nil.

    If a root_dir is returned, then this file will also be attached. You
    can optionally use {filetype} to help pre-filter by filetype.

    If a root_dir is returned which is unique from any previously returned
    root_dir, a new server will be spawned with that root_dir.

    If nil is returned, the buffer is skipped.

    See |lspconfig.util.search_ancestors()| and the functions which use it:
    - |lspconfig.util.root_pattern(patterns...)| finds an ancestor which
    - contains one of the files in `patterns...`. This is equivalent
      to coc.nvim's "rootPatterns"
    - Related utilities for common tools:
      - |lspconfig.util.find_git_root()|
      - |lspconfig.util.find_node_modules_root()|
      - |lspconfig.util.find_package_json_root()|

  {name}
    Defaults to the server's name.

  {filetypes}
    Set of filetypes to filter for consideration by {root_dir}.
    May be empty.
    Server may specify a default value.

  {log_level}
    controls the level of logs to show from window/logMessage notifications. Defaults to
    vim.lsp.protocol.MessageType.Warning instead of
    vim.lsp.protocol.MessageType.Log.

  {message_level}
    controls the level of messages to show from window/showMessage notifications. Defaults to
    vim.lsp.protocol.MessageType.Warning instead of
    vim.lsp.protocol.MessageType.Log.

  {settings}
    Map with case-sensitive keys corresponding to `workspace/configuration`
    event responses.
    We also notify the server *once* on `initialize` with
    `workspace/didChangeConfiguration`.
    If you change the settings later on, you must emit the notification
    with `client.workspace_did_change_configuration({settings})`
    Example: `settings = { keyName = { subKey = 1 } }`

  {on_attach}
    `function(client)` executed with the current buffer as the one the {client}
    is being attached-to. This is different from
    |vim.lsp.start_client()|'s on_attach parameter, which passes the {bufnr} as
    the second parameter instead. Useful for doing buffer-local setup.

  {on_new_config}
    `function(new_config, new_root_dir)` will be executed after a new configuration has been
    created as a result of {root_dir} returning a unique value. You can use this
    as an opportunity to further modify the new_config or use it before it is
    sent to |vim.lsp.start_client()|.

Individual server documentation

See CONFIG.md for documentation and configuration of individual language servers.

pretentious7 / nvim-lspconfig