CoffeeScript Major Mode

An Emacs major mode for CoffeeScript and IcedCoffeeScript.

Provides syntax highlighting, indentation support, imenu support, a menu bar, and a few cute commands.

Requirement

• Emacs 24.3 or higher
• CoffeeScript 1.9.3 or higher

Installation via package.el

coffee-mode is available on MELPA and MELPA-STABLE.

You can install coffee-mode with the following command.

M-x package-install [RET] coffee-mode [RET]

Please do not install GNU Emacs Lisp Package Archive version.

It's too old and many features(Block string, block comment etc) are not implemented.

Whitespace

coffee-mode used to offer automatic deletion of trailing whitespace. This is now left to whitespace-mode. See its documentation for full details, but as a hint, configure:

;; automatically clean up bad whitespace
(setq whitespace-action '(auto-cleanup))
;; only show bad whitespace
(setq whitespace-style '(trailing space-before-tab indentation empty space-after-tab))

Then turn on whitespace-mode, or global-whitespace-mode.

Indentation

To set the number of spaces used with each additional indentation, add this to your .emacs or init.el or other initialization file:

;; This gives you a tab of 2 spaces
(custom-set-variables '(coffee-tab-width 2))

coffee-tab-width is buffer local variable. You can set indentation size per buffer by using File Variables.

# Local variables:
# coffee-tab-width: 4
# End:

Using TAB

Set coffee-indent-tabs-mode t if you want to use TAB instead of spaces.

Move to corresponding point in JavaScript file after compiling

You can archive this with sourcemap and following configuration.

You can install sourcemap package from MELPA.

;; generating sourcemap by '-m' option. And you must set '--no-header' option
(setq coffee-args-compile '("-c" "--no-header" "-m"))
(add-hook 'coffee-after-compile-hook 'sourcemap-goto-corresponding-point)

;; If you want to remove sourcemap file after jumping corresponding point
(defun my/coffee-after-compile-hook (props)
  (sourcemap-goto-corresponding-point props)
  (delete-file (plist-get props :sourcemap)))
(add-hook 'coffee-after-compile-hook 'my/coffee-after-compile-hook)

imenu

If you're using imenu, coffee-mode should work just fine. This means users of textmate.el will find that ⇧⌘T (textmate-go-to-symbol) mostly works as expected.

If you're not using imenu check out this page or textmate.el for a really awesome way to jump quickly to a function's definition in a file.

Default Key Bindings

C-m and Return key insert newline and indentation. If you don't want indentation please overwrite it as below.

(define-key coffee-mode-map (kbd "C-m") 'newline)

Commands

easymenu

If you have easymenu you can get to any of these commands from the menu bar:

coffee-repl

Launch a CoffeeScript REPL

coffee-compile-file

Compile buffer to JavaScript.

coffee-compile-buffer

Compile region to JavaScript

coffee-watch

Run coffee with the --watch flag on a directory or file.

coffee-cos-mode

Minor mode for compiling to JavaScript at save file.

coffee-live-compile-mode

Minor mode for compiling buffer in real time.

Customization

Indent like python-mode

When coffee-indent-like-python-mode is non-nil, indent command works like python-mode. I suppose that Evil's o and O commands works as you expect with this option.

(custom-set-variables
 '(coffee-indent-like-python-mode t))

Sample Configuration

;; coffeescript
(custom-set-variables
 '(coffee-tab-width 2)
 '(coffee-args-compile '("-c" "--no-header" "--bare")))

(eval-after-load "coffee-mode"
  '(progn
     (define-key coffee-mode-map [(meta r)] 'coffee-compile-buffer)
     (define-key coffee-mode-map (kbd "C-j") 'coffee-newline-and-indent)))

Bugs

Please file bugs at https://github.com/defunkt/coffee-mode/issues