Flymake Mode for Emacs/JavaScript

On OSX

First, Downlowd rhino and unzip if it doesn't unzip automatically.

Make a the library directory if it doesn't exist:

mkdir -p ~/Library/Java/Extensions

Copy the jar to the extensions directory:

cp ~/Downloads/rhino1_7R2/js.jar ~/Library/Java/Extensions/

On Linux

I assume on linux this would be apt-get install rhino or equivalent

Test It

run the command:

$ java org.mozilla.javascript.tools.shell.Main

And you should see something like the following:

Rhino 1.7 release 2 2009 03 22
js>

Install the JSLint for Rhino Script

Grab it:

sudo curl http://www.jslint.com/rhino/jslint.js > /usr/local/bin/jslint.js

Setup a Shell Script to Call it

Create a file, I called it jsflakes, with the following contents:

#!/bin/bash
java org.mozilla.javascript.tools.shell.Main /usr/local/bin/jslint.js $1

Make it executable:

chmod a+x /usr/local/bin/jsflakes

Create a flymake-jslint.el file

Create flymake-jslint.el in your emacs site direcory or somewher eon your load path with the folllowing contents:

(require 'flymake)

(defun flymake-jslint-init ()
  (let* ((temp-file (flymake-init-create-temp-buffer-copy
                     'flymake-create-temp-inplace))
         (local-file (file-relative-name
                      temp-file
                      (file-name-directory buffer-file-name))))
    (list "/usr/local/bin/jsflakes" (list local-file))))

(setq flymake-allowed-file-name-masks
      (cons '(".+\\.js$"
              flymake-jslint-init
              flymake-simple-cleanup
              flymake-get-real-file-name)
            flymake-allowed-file-name-masks))

(setq flymake-err-line-patterns
      (cons '("^Lint at line \\([[:digit:]]+\\) character \\([[:digit:]]+\\): \\(.+\\)$"
              nil 1 2 3)
            flymake-err-line-patterns))

(provide 'flymake-jslint)

Import it in your .emacs

Add the following to .emacs:

(require 'flymake-jslint)
(add-hook 'javascript-mode-hook
          (lambda () (flymake-mode 1)))

If you are already seup following Chris McDonough's instructions_ http://plope.com/Members/chrism/flymake-mode you can probably do something like the following (UNTESTED):

(when (load "flymake" t)
 (defun flymake-pyflakes-init ()
   (let* ((temp-file (flymake-init-create-temp-buffer-copy
                             'flymake-create-temp-inplace))
             (local-file (file-relative-name
                          temp-file
                          (file-name-directory buffer-file-name))))
     (list "pyflakes" (list local-file))))
 (defun flymake-jslint-init ()
   (let* ((temp-file (flymake-init-create-temp-buffer-copy
                             'flymake-create-temp-inplace))
             (local-file (file-relative-name
                          temp-file
                          (file-name-directory buffer-file-name))))
     (list "/usr/local/bin/jsflakes" (list local-file))))

 (add-to-list 'flymake-allowed-file-name-masks
              '("\\.py\\'" flymake-pyflakes-init))
 (add-to-list 'flymake-allowed-file-name-masks
              '("\\.js\\'" flymake-jslint-init)))
(add-hook 'find-file-hook 'flymake-find-file-hook)
(load-library "flymake-cursor")