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;;; use-package-ensure-system-package.el --- auto install system packages -*- lexical: t; -*-
;; Copyright (C) 2017 Justin Talbott
;; Author: Justin Talbott <justin@waymondo.com>
;; Keywords: convenience, tools, extensions
;; URL: https://github.com/waymondo/use-package-ensure-system-package
;; Version: 0.1
;; Package-Requires: ((use-package "2.1") (system-packages "1.0.4"))
;; Filename: use-package-ensure-system-package.el
;; License: GNU General Public License version 3, or (at your option) any later version
;;
;;; Commentary:
;;
;; The `:ensure-system-package` keyword allows you to ensure system
;; binaries exist alongside your `use-package` declarations.
;;
;;; Code:
(require 'use-package)
(require 'system-packages nil t)
(eval-when-compile
(declare-function system-packages-get-command "system-packages"))
(defun use-package-ensure-system-package-install-command (pack)
"Return the default install command for PACK."
(system-packages-get-command 'install pack))
(defun use-package-ensure-system-package-consify (arg)
"Turn `arg' into a cons of (`package-name' . `install-command')."
(cond
((stringp arg)
(cons arg (use-package-ensure-system-package-install-command arg)))
((symbolp arg)
(cons arg (use-package-ensure-system-package-install-command (symbol-name arg))))
((consp arg)
(if (stringp (cdr arg))
arg
(cons (car arg)
(use-package-ensure-system-package-install-command (symbol-name (cdr arg))))))))
;;;###autoload
(defun use-package-normalize/:ensure-system-package (name-symbol keyword args)
"Turn `arg' into a list of cons-es of (`package-name' . `install-command')."
(use-package-only-one (symbol-name keyword) args
(lambda (label arg)
(cond
((and (listp arg) (listp (cdr arg)))
(mapcar #'use-package-ensure-system-package-consify arg))
(t
(list (use-package-ensure-system-package-consify arg)))))))
;;;###autoload
(defun use-package-handler/:ensure-system-package (name keyword arg rest state)
"Execute the handler for `:ensure-system-package' keyword in `use-package'."
(let ((body (use-package-process-keywords name rest state)))
(use-package-concat
(mapcar #'(lambda (cons)
`(unless (executable-find (symbol-name ',(car cons)))
(async-shell-command ,(cdr cons)))) arg)
body)))
(add-to-list 'use-package-keywords :ensure-system-package t)
(provide 'use-package-ensure-system-package)
;;; use-package-ensure-system-package.el ends here
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