;;; Find and load the correct package.el
;; When switching between Emacs 23 and 24, we always use the bundled package.el in Emacs 24
(let ((package-el-site-lisp-dir
       (expand-file-name "site-lisp/package" user-emacs-directory)))
  (when (and (file-directory-p package-el-site-lisp-dir)
             (> emacs-major-version 23))
    (message "Removing local package.el from load-path to avoid shadowing bundled version")
    (setq load-path (remove package-el-site-lisp-dir load-path))))

(require 'package)

;; Repositories
;; ================
(setq package-archives
      '(("GNU ELPA"     . "https://elpa.gnu.org/packages/")
        ("MELPA Stable" . "https://stable.melpa.org/packages/")
        ("ORG"          . "https://orgmode.org/elpa/")
        ("MELPA"        . "https://melpa.org/packages/"))
      package-archive-priorities
      '(("MELPA Stable" . 10)
        ("GNU ELPA"     . 5)
        ("ORG"          . 3)
        ("MELPA"        . 0)))

;; =================

;;; Find packages if not installed
;; ================================
;;; On-demand installation of packages
(defun require-package (package &optional min-version no-refresh)
  "Install given PACKAGE, optionally requiring MIN-VERSION.
If NO-REFRESH is non-nil, the available package lists will not be
re-downloaded in order to locate PACKAGE."
  (if (package-installed-p package min-version)
      t
    (if (or (assoc package package-archive-contents) no-refresh)
        (if (boundp 'package-selected-packages)
            ;; Record this as a package the user installed explicitly
            (package-install package nil)
          (package-install package))
      (progn
        (package-refresh-contents)
        (require-package package min-version t)))))
;; ================================

(package-initialize)

(provide 'init-elpa)