roc with emacs · beginners · Zulip Chat Archive

I was starting to code some roc code and I do feel confortable with emacs (doom emacs), so I was thinking that maybe there is someone that already fall in this problem and has some starting guide for me?

Anton (Dec 05 2022 at 08:23):

Hi @Vincenzo Palazzo (vincenzopalazzo), I'm not sure what you meant precisely. Are you looking for a roc emacs plugin?

Vincenzo Palazzo (vincenzopalazzo) (Dec 06 2022 at 16:40):

Sorry if I was not clear, I would like configigure roc syntax hightlight with doom emacs but I was not able to find nothing arond

Anton (Dec 06 2022 at 16:58):

I'm not aware of any syntax highlighting for emacs but perhaps this solution for vscode could be easily adapted.

Brendan Hansknecht (Dec 06 2022 at 17:04):

An extra note, coffee script and elixir syntax highlighting work ok (and I assume exists for emacs). So you can try those and see if it works for you.

Yuriy Al. Shirokov (Nov 30 2023 at 22:07):

Now we have language server and tree-sitter parser for Roc, so the «roc-mode» for Emacs can be defined relatively easy. After some problems with tree-sitter configuration I got a mode with syntax highlighting and type inference (smart autocompletion is unfortunately don't supported by Roc language server yet):

;;; Roc

(define-derived-mode roc-mode fundamental-mode "Roc")
(add-to-list 'auto-mode-alist '("\\.roc\\'" . roc-mode))
;; LSP
(require 'lsp)
(with-eval-after-load 'lsp-mode
  (add-to-list 'lsp-language-id-configuration
    '(roc-mode . "roc"))

  (lsp-register-client
    (make-lsp-client :new-connection (lsp-stdio-connection "roc_ls")
                     :activation-fn (lsp-activate-on "roc")
                     :server-id 'theme-check)))
;; tree-sitter
(require 'treesit)

(defun roc-mode-setup ()
  (interactive)
  (defvar roc-font-lock-rules
    (treesit-font-lock-rules
     :language 'roc
     :feature 'string
     '((string) @font-lock-string-face)

     :language 'roc
     :feature 'comment
     '((line_comment) @font-lock-comment-face)

     :language 'roc
     :feature 'definition
     '((value_declaration_left
        (identifier_pattern
         (long_identifier (identifier) @font-lock-constant-face))))

     :language 'roc
     :feature 'function
     '((application_expression
        caller:
        (long_identifier_or_op
         (long_identifier (identifier) @font-lock-function-name-face))))))

  (setq-local treesit-font-lock-settings
              roc-font-lock-rules)
  (setq-local treesit-font-lock-feature-list
              '((string comment definition function variable)))
  (treesit-major-mode-setup))

(add-hook 'roc-mode-hook (lambda ()
                           (roc-mode-setup)
                           (lsp)
                           (setq treesit-font-lock-level 4)))

Luke Boswell (Nov 30 2023 at 22:22):

Would you mind putting this into a gist or something shareable? I would love to add this to roc-awesome for others to find.

Yuriy Al. Shirokov (Dec 01 2023 at 09:16):

@Luke Boswell It's not a full-functional Emacs mode, just a proof of concept. I assume it will always be edited by other Emacs users. So I'm afraid gist will not be self-explanatory enough. I believe the link to my answer to myself on Emacs StackExchange with the links to documentation and some explanations would be better: https://emacs.stackexchange.com/a/79675/27177
P.S. Thank you for roc-awesome!

Asbjørn Olling (Dec 01 2023 at 12:36):

I don't know enough about emacs to say smart things about this. But I'm gonna try messing with the doom module once I've completed today's AoC :)

Zellyn Hunter (Dec 06 2023 at 23:09):

(use-package roc-mode :elpaca (roc-mode :host gitlab :repo "tad-lispy/roc-mode"))

and after I installed the treesitter grammar (by adding (roc "https://github.com/faldor20/tree-sitter-roc") to my treesit-language-source-alist and doing M-x treesit-install-language-grammar), I'm successfully in roc-mode and getting syntax highlighting.

Zellyn Hunter (Dec 06 2023 at 23:11):

(Although I've used emacs for many years, I've never really learned the elisp APIs… it took me quite a bit of bludgeoning to find the right incantation to install roc-mode using elpaca)

Asbjørn Olling (Dec 07 2023 at 13:17):

Oooh I didn't see that @Tad Lispy put up a proper repo for roc-mode.
I was just using a file copy-pasted from their nixos repo into mine :sweat_smile:

Asbjørn Olling (Dec 07 2023 at 13:20):

I also installed the tree sitter grammar in the same way from the same place as you.

There are a few bugs for me as well. Expressions like this ("foo: \(bar) baz") gets confused about escaping delimiters and mis-colors until EOF.

Eli Dowling (Dec 10 2023 at 02:29):

Payas (Dec 14 2023 at 14:45):

Hi there! Been reading through Roc's documentation past couple of days and am ready to dive in the real thing. My google-fu is failing to find existing stuff, hence reaching out.

Is there something in-progress for Emacs? I am also on NixOS, so any instructions there would also help. I see there is a flake.nix, will check it out

Stream: beginners

Topic: roc with emacs

Vincenzo Palazzo (vincenzopalazzo) (Dec 04 2022 at 17:09):