(require 'package)

(add-to-list 'package-archives
             '("melpa-stable" . "https://stable.melpa.org/packages/"))

(package-initialize)

(if (not (file-exists-p package-user-dir))
    (package-refresh-contents))

(defun ensure-package-installed (package)
  (if (not (package-installed-p package))
      (if (y-or-n-p (format "Package %s is missing. Install it? " package))
          (package-install package))))

(ensure-package-installed 'markdown-mode)
(ensure-package-installed 'haskell-mode)
(ensure-package-installed 'golden-ratio)