my-ruby.el

(defun merb-console (app host user &optional env working-dir)
  "Connect to a remote host and run merb"
  (interactive)
  (require 'inf-ruby)
  (let ((buffer-name-for-comint (concat app "-console"))
    (buffer-name (concat "*" app "-console*"))
    (env (if env env "production"))
    (working-dir (if working-dir working-dir
                    (concat "/data/" app "/current")))
    (cmdlist `("ssh" ,host "-t"
               ,(concat "sudo su -l " user " sh -c 'cd "
                       working-dir " && merb -i -e " env "'"))))
    (if (not (comint-check-proc buffer-name))
        (set-buffer (apply 'make-comint buffer-name-for-comint
                           (car cmdlist) nil (cdr cmdlist)))
      (inferior-ruby-mode))
    (pop-to-buffer buffer-name)))