Emacs major mode for ActorScript

[matthewhammer]

Nice stuff:

• associates .as files with ActorScript mode
• highlights the correct keywords, constants and types of ActorScript
• derives from Swift mode for its auto-indenting behavior, which is mostly consistent with ActorScript

Not nice stuff, for now:

• Because of how Swift and ActorScript's syntax for switch differs, tends to over-indent nested switch expressions quite badly. This is no worse than the status quo, however, which is just to use Swift mode in place of this mode.

---

To try this out yourself, open this file in emacs and

• do M-x eval-buffer, then open an ActorScript source file, or
• do M-x actorscript-mode on an already-open ActorScript source file.

[crusso]

Cool! Those instructions didn't work for me. Do I need to install swift-mode first perhaps?

[matthewhammer]

Ah, yes. I should have mentioned that.

M-x package-install and then choose swift3-mode, if I recall correctly.

[paulyoung]

I have this in my .spacemacs file, in case any of it is useful/not covered here.

  ;; ActorScript

  ;; https://www.emacswiki.org/emacs/SampleMode
  ;; https://www.emacswiki.org/emacs/DerivedMode
  (define-derived-mode actorscript-mode fundamental-mode "ActorScript"
    "A major mode for editing ActorScript files"
    (setq tab-width 2)

    ;; Adapted from
    ;; https://github.com/swift-emacs/swift-mode/blob/55ce4e53f856626938b50f014c5f82947a628d6a/swift-mode.el#L173-L190
    (setq-local comment-start "// ")
    (setq-local comment-end "")
    (setq-local comment-start-skip
                (concat
                 "\\s *"
                 ;; Single-line comment
                 "//+"
                 ;; Multi-line comment
                 "/\\*+"
                 ;; Middle of multi-line-comment
                 "\\*+ "
                 "\\s *"))
    (setq-local adaptive-fill-regexp comment-start-skip)
    (setq-local comment-multi-line t)
    )

  (provide 'actorscript-mode)

  (add-to-list 'auto-mode-alist '("\\.as$" . actorscript-mode))

  )

[crusso]

Ok, I got this to work with swift-mode (not swift3-mode). I don't see any harm in mergeing, but perhaps add a README.md

[crusso]

I wonder how easy it would be to get flycheck (https://www.flycheck.org/en/latest/index.html) working to invoke asc as an interative type-checker.

[crusso]

Sorry, I forgot to approve. Would be nice to sort out the switch indentation, but that can happen later...