Important

Next LS now has support for Credo, so Credo Language Server will not receive further significant updates.

credo-language-server

credo-language-server is an LSP implementation for Credo.

Features

• Project wide diagnostics
• Code Actions

Editor Support

• Neovim: elixir-tools.nvim
• VSCode: elixir-tools.vscode
• Emacs

  Using lsp-mode:

  credo-language-server is included with lsp-mode and can be installed by running M-x lsp-install-server credo-language-server.

  You might want to set the lsp-credo-version to the latest release:

  (custom-set-variables '(lsp-credo-version "0.1.3"))

  or by running M-x customize-group lsp-credo and updating the version.

  Visit lsp-mode for detailed installation instructions.

  Using eglot:

  (require 'eglot)
  
  (add-to-list 'exec-path "path/to/credo-language-server/bin")
  
  (with-eval-after-load 'eglot
    (add-to-list 'eglot-server-programs
                 `((elixir-ts-mode heex-ts-mode elixir-mode) .
                   ("credo-language-server" "--stdio=true"))))
  
  (add-hook 'elixir-mode-hook 'eglot-ensure)
  (add-hook 'elixir-ts-mode-hook 'eglot-ensure)
  (add-hook 'heex-ts-mode-hook 'eglot-ensure)

  Eglot only allows one server per mode, but it is possible to configure eglot alternatives to prompt for a specific language server.

  (require 'eglot)
  
  (setq exec-path
        (append exec-path
                '("path/to/credo-language-server/bin"
                  "path/to/elixir-ls/bin")))
  
  (add-to-list
   'eglot-server-programs
   `((elixir-mode elixir-ts-mode heex-ts-mode) .
     ,(eglot-alternatives
       `(,(if (and (fboundp 'w32-shell-dos-semantics)
                   (w32-shell-dos-semantics))
              '("language_server.bat")
            '("language_server.sh"))
         ("credo-language-server" "--stdio=true")))))

• Helix

  Here is an example configuration for languages.toml

  [[language]]
  name = "elixir"
  scope = "source.elixir"
  injection-regex = "elixir"
  file-types = ["ex", "exs"]
  roots = ["mix.exs"]
  auto-format = false
  diagnostic-severity = "Hint"
  comment-token = "#"
  indent = {tab-width = 2, unit = " "}
  language-servers = ["elixir-ls", "credo"]
  
  [language-server.elixir-ls]
  command = "elixir-ls"
  config = { elixirLS.dialyzerEnabled = true }
  
  [language-server.credo]
  command = "/path/to/executable/credo-language-server"
  args = ["--stdio=true", "--port=999"]

Installation

The preferred way to use credo-language-server is through one of the supported editor extensions.

If you need to install credo-language-server on it's own, you can download the executable hosted by the GitHub release. The executable is an Elixir script that utilizes Mix.install/2.

Note

Credo Language Server creates an .elixir-tools hidden directory in your project.

This should be added to your project's .gitignore.

Code Actions

DisableCheck

Check: all

If there is a check that you'd wish to disable, you can trigger the code action on that line to insert a magic comment to disable that check.

ModuleDocFalse

Check: Credo.Check.Readability.ModuleDoc

Inject a @moduledoc false snippet into the module.

Contributing

Running tests

# setup the test project
$ (cd test/support/project && mix deps.get)

# run the tests
$ mix test

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