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;;; pdf-loader.el --- Minimal PDF Tools loader -*- lexical-binding: t; -*-
;; Copyright (C) 2017 Andreas Politz
;; Author: Andreas Politz <politza@hochschule-trier.de>
;; Keywords:
;; 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 this program. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;;; Code:
(defconst pdf-loader--auto-mode-alist-item
(copy-sequence "\\.[pP][dD][fF]\\'")
"The item used in `auto-mode-alist'.")
(defconst pdf-loader--magic-mode-alist-item
(copy-sequence "%PDF")
"The item used in`magic-mode-alist'.")
(declare-function pdf-tools-install "pdf-tools.el")
;;;###autoload
(defun pdf-loader-install (&optional no-query-p skip-dependencies-p
no-error-p force-dependencies-p)
"Prepare Emacs for using PDF Tools.
This function acts as a replacement for `pdf-tools-install' and
makes Emacs load and use PDF Tools as soon as a PDF file is
opened, but not sooner.
The arguments are passed verbatim to `pdf-tools-install', which
see."
(let ((args (list no-query-p skip-dependencies-p
no-error-p force-dependencies-p)))
(if (featurep 'pdf-tools)
(apply #'pdf-tools-install args)
(pdf-loader--install
(lambda ()
(apply #'pdf-loader--load args))))))
(defun pdf-loader--load (&rest args)
(pdf-loader--uninstall)
(save-selected-window
(apply #'pdf-tools-install args)))
(defun pdf-loader--install (loader)
(pdf-loader--uninstall)
(push (cons pdf-loader--auto-mode-alist-item loader)
auto-mode-alist)
(push (cons pdf-loader--magic-mode-alist-item loader)
magic-mode-alist))
(defun pdf-loader--uninstall ()
(let ((elt (assoc pdf-loader--auto-mode-alist-item
auto-mode-alist)))
(when elt
(setq auto-mode-alist (remove elt auto-mode-alist))))
(let ((elt (assoc pdf-loader--magic-mode-alist-item
magic-mode-alist)))
(when elt
(setq magic-mode-alist (remove elt magic-mode-alist)))))
(provide 'pdf-loader)
;;; pdf-loader.el ends here
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