;;; prelude-packages.el --- Emacs Prelude: default package selection.
;;
;; Copyright © 2011-2013 Bozhidar Batsov
;;
;; Author: Bozhidar Batsov <bozhidar@batsov.com>
;; URL: http://batsov.com/emacs-prelude
;; Version: 1.0.0
;; Keywords: convenience

;; This file is not part of GNU Emacs.

;;; Commentary:

;; Takes care of the automatic installation of all the packages required by
;; Emacs Prelude.

;;; License:

;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the GNU General Public License
;; as published by the Free Software Foundation; either version 3
;; of the License, or (at your option) any later version.
;;
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Code:
(require 'package)
(add-to-list 'package-archives
             '("melpa" . "http://melpa.milkbox.net/packages/") t)
;; set package-user-dir to be relative to Prelude install path
(setq package-user-dir (expand-file-name "elpa" prelude-dir))
(package-initialize)

(defvar prelude-packages
  '(ace-jump-mode ack-and-a-half elisp-slime-nav exec-path-from-shell
                  expand-region flycheck gist
                  git-commit-mode gitconfig-mode gitignore-mode
                  guru-mode helm helm-projectile
                  magit magithub melpa
                  rainbow-mode solarized-theme undo-tree
                  volatile-highlights yasnippet zenburn-theme)
  "A list of packages to ensure are installed at launch.")

(defun prelude-packages-installed-p ()
  (-all? #'package-installed-p prelude-packages))

(defun prelude-install-packages ()
  (unless (prelude-packages-installed-p)
    ;; check for new packages (package versions)
    (message "%s" "Emacs Prelude is now refreshing its package database...")
    (package-refresh-contents)
    (message "%s" " done.")
    ;; install the missing packages
    (-each
     (-reject #'package-installed-p prelude-packages)
     #'package-install)))

(prelude-install-packages)

(defmacro prelude-auto-install (extension package mode)
  `(add-to-list 'auto-mode-alist
                `(,extension . (lambda ()
                                 (unless (package-installed-p ',package)
                                   (package-install ',package))
                                 (,mode)))))

(defvar prelude-auto-install-alist
  '(("\\.clj\\'" clojure-mode clojure-mode)
    ("\\.coffee\\'" coffee-mode coffee-mode)
    ("\\.css\\'" css-mode css-mode)
    ("\\.erl\\'" erlang erlang-mode)
    ("\\.feature\\'" feature-mode feature-mode)
    ("\\.groovy\\'" groovy-mode groovy-mode)
    ("\\.haml\\'" haml-mode haml-mode)
    ("\\.hs\\'" haskell-mode haskell-mode)
    ("\\.latex\\'" auctex LaTeX-mode)
    ("\\.less\\'" less-css-mode less-css-mode)
    ("\\.lua\\'" lua-mode lua-mode)
    ("\\.markdown\\'" markdown-mode markdown-mode)
    ("\\.md\\'" markdown-mode markdown-mode)
    ("\\.php\\'" php-mode php-mode)
    ("\\.py\\'" python python-mode)
    ("\\.sass\\'" sass-mode sass-mode)
    ("\\.scala\\'" scala-mode2 scala-mode)
    ("\\.scss\\'" scss-mode scss-mode)
    ("\\.slim\\'" slim-mode slim-mode)
    ("\\.yml\\'" yaml-mode yaml-mode)))

;; markdown-mode doesn't have autoloads for the auto-mode-alist
;; so we add them manually if it's already installed
(when (package-installed-p 'markdown-mode)
  (add-to-list 'auto-mode-alist '("\\.markdown\\'" . markdown-mode))
  (add-to-list 'auto-mode-alist '("\\.md\\'" . markdown-mode)))

(-each prelude-auto-install-alist
  (lambda (entry)
    (let ((extension (car entry))
          (package (cadr entry))
          (mode (cadr (cdr entry))))
      (unless (package-installed-p package)
        (prelude-auto-install extension package mode)))))

(defun prelude-ensure-module-deps (packages)
  (-each (-remove #'package-installed-p packages) #'package-install))

(provide 'prelude-packages)
;;; prelude-packages.el ends here