JavaScript mode

• Install the preferred javascript-mode library.

• Define a new c-style:

  (setq c-style-alist
        (append c-style-alist
                '(("actual-python"
                   (indent-tabs-mode . nil)
                   (fill-column . 79)
                   (c-basic-offset . 8)
                   (c-offsets-alist
                    (substatement-open . 0)
                    (inextern-lang . 0)
                    (arglist-intro . +)
                    (knr-argdecl-intro . +))
                   (c-hanging-braces-alist
                    (brace-list-open)
                    (brace-list-intro)
                    (brace-list-close)
                    (brace-entry-open)
                    (substatement-open after)
                    (block-close . c-snug-do-while))
                   (c-block-comment-prefix . "")))))
  

• Customize c-default-style to "actual-python".
• Customize c-basic-offset to 4.

If you sometimes use Emacs 22, this incantation will be required instead:

(if (condition-case nil
        (symbol-function 'c-block-in-arglist-dwim)
      (error nil))
    (defun javascript-fixed-c-lineup-arglist (langelem)
      (save-excursion
        (if (c-block-in-arglist-dwim (c-langelem-2nd-pos c-syntactic-element))
            0
          (c-lineup-arglist langelem))))
  (defun javascript-fixed-c-lineup-arglist (langelem)
    (c-lineup-arglist langelem)))

(setq c-style-alist
      (append c-style-alist
              '(("actual-python"
                 (indent-tabs-mode . nil)
                 (fill-column . 78)
                 (c-basic-offset . 4)
                 (c-offsets-alist
                  (substatement-open . 0)
                  (inextern-lang . 0)
                  (knr-argdecl-intro . +)
                  (arglist-cont-nonempty . javascript-fixed-c-lineup-arglist))
                 (c-hanging-braces-alist
                  (brace-list-open)
                  (brace-list-intro)
                  (brace-list-close)
                  (brace-entry-open)
                  (substatement-open after)
                  (block-close . c-snug-do-while))
                 (c-block-comment-prefix . "")))))

(custom-set-variables  '(c-default-style "actual-python")
                       '(c-basic-offset 4))