packages.el

(require 'package)
(require 'cl)

(add-to-list 'package-archives
             '("melpa" . "http://melpa.milkbox.net/packages/") t)
(add-to-list 'package-archives
             '("melpa-stable" . "https://stable.melpa.org/packages/") t)
(add-to-list 'package-archives
             '("marmalade" . "http://marmalade-repo.org/packages/") t)
(add-to-list 'package-pinned-packages
             '(cider . "melpa-stable") t)


(package-initialize)


(defvar required-packages
  '(;; Tools
    exec-path-from-shell
    magit
    smartparens
    undo-tree
    auto-complete
    ace-jump-mode
    yasnippet
    smex
    git-gutter
    rich-minority
    smooth-scroll
    scratch
    idle-highlight-mode
    neotree
    window-number
    ibuffer-vc

    ;; Programming
    web-mode
    clojure-mode
    cider
    markdown-mode

    ;; Themes
    tangotango-theme) "Default packages")


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


;; If not all packages are installed,
;; check one by one and install the missing ones.
(unless (packages-installed-p)
  ;; check for new packages (package versions)
  (message "%s" "Emacs is now refreshing its package database...")
  (package-refresh-contents)
  (message "%s" " done.")
  ;; install the missing packages
  (dolist (p required-packages)
    (when (not (package-installed-p p))
      (package-install p))))