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;;; 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)
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