ErlLS

Erlang language server.

Supported LSP features

• [ ] [textDocument/definition](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_definition)
  • [x] Module
  • [x] Function
  • [x] Type
  • [x] Record
  • [x] Macro
  • [ ] Variable
  • [x] Include file
• [x] [textDocument/formatting](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_formatting)
  • [x] Formatting documents by using efmt
• [ ] [textDocument/completion](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_completion)
  • [x] Fully qualified function name
  • [x] Fully qualified type name
  • [ ] Record name
  • [ ] Record field name
• [ ] [textDocument/publishDiagnostics](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_publishDiagnostics)
• [ ] [textDocument/rename](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_rename)
• [x] [textDocument/semanticTokens/full](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_semanticTokens)
• [x] [textDocument/semanticTokens/range](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_semanticTokens)

Editor integrations

ErlLS can be used with any LSP clients. Here are a few examples.

Visual Studio Code

Please install erlls extension.

There is no need to install the erlls binary using the $ cargo install command as the extension already includes the WebAssembly build.

Note that the extension doesn't offer some basic features such as syntax highlighting, so it's recommended to use it in conjunction with other Erlang extensions.

Emacs (lsp-mode)

1. Install erlls command.

console $ cargo install erlls

1. Add the following code to your .emacs file.

```emacs (with-eval-after-load 'lsp-mode (add-to-list 'lsp-language-id-configuration '(erlang-mode . "erlang")))

(lsp-register-client (make-lsp-client :new-connection (lsp-stdio-connection "erlls") :activation-fn (lsp-activate-on "erlang") :priority -1 :server-id 'erlls)) ```