Checkmate-LSP

A LSP framework to inject a LSP diagnostics. The most common use case is to run linters (ESLint, Stylelint ...) and inject the errors/warnings into your editor.

At the core of Checkmate lies its architectural concept of plugins. Each enabled plugin execute designated commands, parsing their output and subsequently generating LSP diagnostics in the form of errors, warnings, or other relevant feedback. This dynamic system empowers users to individually activate or deactivate specific plugins according to their tailored editor configuration.

Currently we support:

• ESLint
• Stylelint
• PHPCS
• PHPstan

More plugins will be added over time, contributions are welcomed.

Motivation

Running linters should be a straightforward task, however, the current landscape presents numerous options for executing specific linters within your preferred code editor. This often entails installing distinct extensions or plugins within your editor. When dealing with multiple programming languages, this approach necessitates the installation of a separate linter for each language, which is suboptimal. The Language Server Protocol (LSP) emerges as a powerful solution, making it a prime candidate for this task.

Checkmate draws significant inspiration from null-ls, regrettably, null-ls is now archived. The distinction between the two lies in the fact that Checkmate functions as an LSP server. This renders it editor-agnostic, allowing it to seamlessly integrate with any editor that supports the LSP protocol, along with all its associated plugins.

Install

Using cargo

cargo install checkmate-lsp

Enabling plugins

Users can enable plugins within their editor LSP settings for checkmate. An example for enabling ESLint in Neovim(see below for full example):

lspconfig.checkmate.setup{
     settings = {
        checkmate = {
          plugins = {
            eslint = {}
          }
        };
     }
}

Each plugin ships with a default cmd, arguments and filetypes that the plugin is intended for, this can be overriden by passing the cmd, args and filetypes parameters.

lspconfig.checkmate.setup{
     settings = {
        checkmate = {
          plugins = {
            eslint = {
              cmd = "/my/custom/path/eslint",
              args = "--custom=true",
              filetypes = "js,svelte"
            }
          }
        };
     }
}

The above example will run on every file change of .js or .svelte file the command: /my/custom/path/eslint --custom=true and return results via LSP.

Developing new plugins

We welcome any contributions to support new plugins/linters. You can check the plugins folder for examples. A new plugins also needs to registered at lsp.rs.

Editor Setup

Neovim

Plugins required:

• lspconfig (https://github.com/neovim/nvim-lspconfig)

After installing the package, add this to your lua config

local configs = require 'lspconfig.configs'
local lspconfig = require 'lspconfig'

if not configs.checkmate then
 configs.checkmate = {
   default_config = {
     cmd = {'checkmate-lsp'},
     root_dir = function(pattern)
      local cwd = vim.loop.cwd()
      local root = lspconfig.util.root_pattern('.git')(pattern)

      -- prefer cwd if root is a descendant
      return lspconfig.util.path.is_descendant(cwd, root) and cwd or root
     end,
     settings = {
        checkmate = {
          plugins = {
            phpcs = {
                args = "--standard=PSR12 --extensions=php,module,inc,install,test,profile,theme,css,info,txt,md,yml";
            },
            eslint = {},
            phpstan = {}
          }
        };
     },
   },
 }
end
lspconfig.checkmate.setup{}

Alternatives

• null-ls: Use Neovim as a language server to inject LSP diagnostics, code actions, and more via Lua.

• efm-langserver and diagnostic-languageserver: general-purpose language servers that can provide formatting and diagnostics from CLI output.

• nvim-lint: a Lua plugin that focuses on providing diagnostics from CLI output.

• formatter.nvim: a Lua plugin that (surprise) focuses on formatting.

• hover.nvim: Hover plugin framework for Neovim.