My Emacs configuration.
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;;; use-package-ensure.el --- Support for the :ensure and :pin keywords -*- lexical-binding: t; -*-
;; Copyright (C) 2012-2017 John Wiegley
;; Author: John Wiegley <>
;; Maintainer: John Wiegley <>
;; Created: 17 Jun 2012
;; Modified: 3 Dec 2017
;; Version: 1.0
;; Package-Requires: ((emacs "24.3") (use-package "2.4"))
;; Keywords: dotemacs startup speed config package
;; URL:
;; 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, 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
;; 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., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;; Provides support for the :ensure and :pin keywords, which is made available
;; by default by requiring `use-package'.
;;; Code:
(require 'cl-lib)
(require 'use-package-core)
(defgroup use-package-ensure nil
"Support for :ensure and :pin keywords in use-package declarations."
:group 'use-package)
(declare-function package-installed-p "package")
(declare-function package-read-all-archive-contents "package" ()))
(defcustom use-package-always-ensure nil
"Treat every package as though it had specified using `:ensure SEXP'.
See also `use-package-defaults', which uses this value."
:type 'sexp
:group 'use-package-ensure)
(defcustom use-package-always-pin nil
"Treat every package as though it had specified using `:pin SYM'.
See also `use-package-defaults', which uses this value."
:type 'symbol
:group 'use-package-ensure)
(defcustom use-package-ensure-function 'use-package-ensure-elpa
"Function that ensures a package is installed.
This function is called with three arguments: the name of the
package declared in the `use-package' form; the arguments passed
to all `:ensure' keywords (always a list, even if only one); and
the current `state' plist created by previous handlers.
Note that this function is called whenever `:ensure' is provided,
even if it is nil. It is up to the function to decide on the
semantics of the various values for `:ensure'.
This function should return non-nil if the package is installed.
The default value uses package.el to install the package."
:type '(choice (const :tag "package.el" use-package-ensure-elpa)
(function :tag "Custom"))
:group 'use-package-ensure)
;;;; :pin
(defun use-package-normalize/:pin (_name keyword args)
(use-package-only-one (symbol-name keyword) args
#'(lambda (_label arg)
((stringp arg) arg)
((use-package-non-nil-symbolp arg) (symbol-name arg))
":pin wants an archive name (a string)"))))))
(defvar package-pinned-packages)
(defvar package-archives))
(defun use-package-archive-exists-p (archive)
"Check if a given ARCHIVE is enabled.
ARCHIVE can be a string or a symbol or 'manual to indicate a
manually updated package."
(if (member archive '(manual "manual"))
(let ((valid nil))
(dolist (pa package-archives)
(when (member archive (list (car pa) (intern (car pa))))
(setq valid 't)))
(defun use-package-pin-package (package archive)
(unless (boundp 'package-pinned-packages)
(setq package-pinned-packages ()))
(let ((archive-symbol (if (symbolp archive) archive (intern archive)))
(archive-name (if (stringp archive) archive (symbol-name archive))))
(if (use-package-archive-exists-p archive-symbol)
(add-to-list 'package-pinned-packages (cons package archive-name))
(error "Archive '%s' requested for package '%s' is not available."
archive-name package))
(unless (bound-and-true-p package--initialized)
(package-initialize t))))
(defun use-package-handler/:pin (name _keyword archive-name rest state)
(let ((body (use-package-process-keywords name rest state))
(pin-form (if archive-name
`(use-package-pin-package ',(use-package-as-symbol name)
;; Pinning should occur just before ensuring
;; See `use-package-handler/:ensure'.
(if (bound-and-true-p byte-compile-current-file)
(eval pin-form) ; Eval when byte-compiling,
(push pin-form body)) ; or else wait until runtime.
;;;; :ensure
(defvar package-archive-contents)
(defun use-package-normalize/:ensure (_name keyword args)
(if (null args)
(list t)
(use-package-only-one (symbol-name keyword) args
#'(lambda (_label arg)
((symbolp arg)
(list arg))
((and (listp arg) (= 3 (length arg))
(symbolp (nth 0 arg))
(eq :pin (nth 1 arg))
(or (stringp (nth 2 arg))
(symbolp (nth 2 arg))))
(list (cons (nth 0 arg) (nth 2 arg))))
(concat ":ensure wants an optional package name "
"(an unquoted symbol name), or (<symbol> :pin <string>)"))))))))
(defun use-package-ensure-elpa (name args _state &optional _no-refresh)
(dolist (ensure args)
(let ((package
(or (and (eq ensure t) (use-package-as-symbol name))
(when package
(require 'package)
(when (consp package)
(use-package-pin-package (car package) (cdr package))
(setq package (car package)))
(unless (package-installed-p package)
(condition-case-unless-debug err
(when (assoc package (bound-and-true-p
(if (assoc package package-archive-contents)
(package-install package)
(when (assoc package (bound-and-true-p
(package-install package))
(display-warning 'use-package
(format "Failed to install %s: %s"
name (error-message-string err))
(defun use-package-handler/:ensure (name _keyword ensure rest state)
(let* ((body (use-package-process-keywords name rest state)))
;; We want to avoid installing packages when the `use-package' macro is
;; being macro-expanded by elisp completion (see `lisp--local-variables'),
;; but still install packages when byte-compiling, to avoid requiring
;; `package' at runtime.
(if (bound-and-true-p byte-compile-current-file)
;; Eval when byte-compiling,
(funcall use-package-ensure-function name ensure state)
;; or else wait until runtime.
(push `(,use-package-ensure-function ',name ',ensure ',state)
(add-to-list 'use-package-defaults
'(:ensure (list use-package-always-ensure)
(lambda (name args)
(and use-package-always-ensure
(not (plist-member args :load-path))))) t)
(add-to-list 'use-package-defaults
'(:pin use-package-always-pin use-package-always-pin) t)
(add-to-list 'use-package-keywords :ensure)
(add-to-list 'use-package-keywords :pin)
(provide 'use-package-ensure)
;;; use-package-ensure.el ends here