81 lines
2.5 KiB
EmacsLisp
81 lines
2.5 KiB
EmacsLisp
;;; pdf-loader.el --- Minimal PDF Tools loader -*- lexical-binding: t; -*-
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;; Copyright (C) 2017 Andreas Politz
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;; Author: Andreas Politz <politza@hochschule-trier.de>
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;; Keywords:
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;;
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;;; Code:
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(defconst pdf-loader--auto-mode-alist-item
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(copy-sequence "\\.[pP][dD][fF]\\'")
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"The item used in `auto-mode-alist'.")
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(defconst pdf-loader--magic-mode-alist-item
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(copy-sequence "%PDF")
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"The item used in`magic-mode-alist'.")
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(declare-function pdf-tools-install "pdf-tools.el")
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;;;###autoload
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(defun pdf-loader-install (&optional no-query-p skip-dependencies-p
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no-error-p force-dependencies-p)
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"Prepare Emacs for using PDF Tools.
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This function acts as a replacement for `pdf-tools-install' and
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makes Emacs load and use PDF Tools as soon as a PDF file is
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opened, but not sooner.
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The arguments are passed verbatim to `pdf-tools-install', which
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see."
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(let ((args (list no-query-p skip-dependencies-p
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no-error-p force-dependencies-p)))
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(if (featurep 'pdf-tools)
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(apply #'pdf-tools-install args)
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(pdf-loader--install
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(lambda ()
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(apply #'pdf-loader--load args))))))
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(defun pdf-loader--load (&rest args)
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(pdf-loader--uninstall)
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(save-selected-window
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(pdf-tools-install args)))
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(defun pdf-loader--install (loader)
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(pdf-loader--uninstall)
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(push (cons pdf-loader--auto-mode-alist-item loader)
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auto-mode-alist)
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(push (cons pdf-loader--magic-mode-alist-item loader)
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magic-mode-alist))
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(defun pdf-loader--uninstall ()
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(let ((elt (assoc pdf-loader--auto-mode-alist-item
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auto-mode-alist)))
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(when elt
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(setq auto-mode-alist (remove elt auto-mode-alist))))
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(let ((elt (assoc pdf-loader--magic-mode-alist-item
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magic-mode-alist)))
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(when elt
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(setq magic-mode-alist (remove elt magic-mode-alist)))))
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(provide 'pdf-loader)
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;;; pdf-loader.el ends here
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