From: Vincent Foley <vfoley@...>
Date: 2005-06-29T08:15:41+09:00
Subject: Re: .rhtml syntax and win32 editor

If one of them is your cup of tea, vim and Emacs both do rhtml
highlighting.  For vim, just get eruby.vim and have an autocommand to
load that file when you open a .rhtml file.

Emacs is trickier, you gotta use mmm-mode, a mode that allows multiple
major mode to be on simultaneously.  Here's my config:

(require 'mmm-mode)
(require 'mmm-auto)
(setq mmm-global-mode 'maybe)
(setq mmm-submode-decoration-level 2)
(set-face-background 'mmm-output-submode-face  "DarkSlateGray")
(set-face-background 'mmm-code-submode-face    "DarkSlateBlue")
(set-face-background 'mmm-comment-submode-face "DarkOliveGreen")
(mmm-add-classes
 '((erb-code
    :submode ruby-mode
    :match-face (("<%#" . mmm-comment-submode-face)
                 ("<%=" . mmm-output-submode-face)
                 ("<%"  . mmm-code-submode-face))
    :front "<%[#=]?"
    :back "%>"
    :insert ((?% erb-code       nil @ "<%"  @ " " _ " " @ "%>" @)
             (?# erb-comment    nil @ "<%#" @ " " _ " " @ "%>" @)
             (?= erb-expression nil @ "<%=" @ " " _ " " @ "%>" @)))))
(add-hook 'html-mode-hook
          (lambda ()
            (local-set-key (kbd "<f8>") 'mmm-parse-buffer)
            (setq mmm-classes '(erb-code))
            (mmm-mode-on)))
(add-to-list 'auto-mode-alist '("\\.rhtml$" . html-mode))