(require 'cl)

(defvar my-packages '(ag auto-complete
                         cc-mode
                         yaml-mode
                         markdown-mode
                         counsel
                         expand-region
                         flycheck
                         grizzl
                         fill-column-indicator
                         feature-mode
                         flycheck-pos-tip
                         gitignore-mode
                         golden-ratio
                         swiper
                         linum-relative
                         magit
                         neotree
                         paredit
                         smex
                         powerline
                         projectile
                         wrap-region
                         rainbow-delimiters
                         zenburn-theme)
  "Packages to make sure are installed")

(defun my-packages-installed-p ()
  (loop for p in my-packages
        when (not (package-installed-p p)) do (return nil)
        finally (return t)))

(unless (my-packages-installed-p)
  ;; check for new packages (package versions)
  (package-refresh-contents)
  ;; install the missing packages
  (dolist (p my-packages)
    (when (not (package-installed-p p))
      (package-install p))))