Skip to content


Subversion checkout URL

You can clone with
Download ZIP
Emacs major mode for editing Lua
Emacs Lisp Makefile
Fetching latest commit...
Cannot retrieve the latest commit at this time.
Failed to load latest commit information.

Lua mode

lua-mode is a major mode for editing Lua sources in Emacs. After a rather long hiatus, it's back in active development stage, so make sure to visit homepage frequently enough.

If you have a problem or a suggestion about lua-mode, please, let me know about it via github's Issue Tracker.


To install, just copy lua-mode.el into a directory on your load-path (and optionally byte-compile it). To set up Emacs to automatically edit files ending in .lua or with a lua hash-bang line using lua-mode add the following to your init file:

(autoload 'lua-mode "lua-mode" "Lua editing mode." t)
(add-to-list 'auto-mode-alist '("\\.lua$" . lua-mode))
(add-to-list 'interpreter-mode-alist '("lua" . lua-mode))


lua-mode supports c-mode style formatting and sending of lines/regions/files to a Lua interpreter. An interpreter (see variable lua-default-application) will be started if you try to send some code and none is running. You can use the process-buffer (named after the application you chose) as if it were an interactive shell. See the documentation for comint.el for details.

Lua-mode also works with Hide Show minor mode (see hs-minor-mode).


Currently, there're a lot of features that need fixing (or reimplementing), including but not limited to:

  1. implementing autotesting of indentation engine
  2. supporting line-continuation commas
  3. fixing close-brace/paren positioning
  4. fix syntax handling of multiline comments/literals (including both highlighting & indentation)
  5. implementing a crisp scheme of customizing the way lua-mode indents the code
  6. cleaning up existing code
  7. extending docs & comments

CEDET/Semantic integration

Also, there's a rather distant goal to integrate lua-mode with cedet's semantic. This would mean an almost complete rewrite, but I think the challenge is worth it. There's a slightest concern about the overhead brought by this dependency, but semantic is already being shipped with Emacs, so there might be no problem after all.

Use wisent-generated grammar

First stage would be to rewrite syntax handling with help of semantic/wisent-generated parser based on the actual Lua grammar. Currently, syntax analysis is done ad-hoc and, despite the model is oversimplified and doesn't treat corner situation well, it's still very tricky and really hard to grasp.

Extend cedet/semantic facilities onto Lua

And there's the cherry on the pie: after completing the wisent-generated parser, the next step will be to provide semantic with all the information it needs to do it's magic of code analysis and generation.

Something went wrong with that request. Please try again.