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;;; jao-doc-view.el -- extensions for doc-view -*- lexical-binding: t; -*-
;; Copyright (c) 2013, 2015, 2017, 2018, 2019, 2021, 2022 Jose Antonio Ortega Ruiz
;; This file 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 file 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/>.
;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
;; Start date: Fri Feb 15, 2013 01:21
(require 'doc-view)
;;; PDF info
(defvar-local jao--pdf-outline nil)
(defmacro jao-doc-view--pdf-call (a b &rest args)
`(cond ((derived-mode-p 'pdf-view-mode) (,a ,@args))
((derived-mode-p 'doc-view-mode) (,b ,@args))))
(defun jao-doc-view-is-pdf (file) (string-match-p ".*\\.pdf$" file))
(defun jao-doc-view-title->file (title)
(concat (mapconcat 'downcase (split-string title nil t) "-") ".pdf"))
(defun jao-doc-view-current-page ()
(jao-doc-view--pdf-call pdf-view-current-page doc-view-current-page))
(defun jao-doc-view-goto-page (page &optional height)
(when page
(jao-doc-view--pdf-call pdf-view-goto-page doc-view-goto-page page))
(when (and height (derived-mode-p 'pdf-view-mode))
(image-set-window-vscroll
(round (/ (* height (cdr (pdf-view-image-size))) (frame-char-height))))))
(defvar jao-doc-view--outline-rx
".+\\(\t+\\)\"\\(.+\\)\"\t#\\(?:page=\\)?\\([0-9]+\\)")
(defun jao-doc-view-pdf-outline (&optional file-name)
(if (derived-mode-p 'pdf-view-mode)
(pdf-info-outline)
(let* ((outline nil)
(fn (or file-name (buffer-file-name) jao-doc-view--imenu-file))
(fn (shell-quote-argument (expand-file-name fn))))
(with-temp-buffer
(insert (shell-command-to-string (format "mutool show %s outline" fn)))
(goto-char (point-min))
(while (re-search-forward jao-doc-view--outline-rx nil t)
(push `((level . ,(length (match-string 1)))
(title . ,(match-string 2))
(page . ,(string-to-number (match-string 3))))
outline)))
(nreverse outline))))
(defun jao-doc-view-section-title (&optional page file-name)
(when (not jao--pdf-outline)
(setq-local jao--pdf-outline (jao-doc-view-pdf-outline file-name)))
(let ((page (or page (jao-doc-view-current-page)))
(outline jao--pdf-outline)
(cur-page 0)
(cur-title (jao-doc-view-title (or file-name buffer-file-name "title"))))
(while (and (car outline) (< cur-page page))
(setq cur-page (cdr (assoc 'page (car outline))))
(when (<= cur-page page)
(setq cur-title (cdr (assoc 'title (car outline)))))
(setq outline (cdr outline)))
(replace-regexp-in-string "[[:blank:]]+" " " cur-title)))
(defun jao-doc-view-title (&optional fname)
(if (or fname (not (derived-mode-p 'doc-view-mode 'pdf-view-mode)))
(let ((base (file-name-base (or fname (buffer-file-name)))))
(capitalize (replace-regexp-in-string "-" " " base)))
(or (jao-doc-view-section-title)
(when buffer-file-name (jao-doc-view-title buffer-file-name)))))
;;; imenu
(defvar-local jao-doc-view--imenu-file nil)
(defvar-local jao-doc-view--goer 'jao-doc-view-goto-page)
(defun jao-doc-view--enable-imenu (&optional file-name goto-page)
(setq-local imenu-create-index-function #'jao-doc-view--imenu-create-index
jao-doc-view--imenu-file (or file-name jao-doc-view--imenu-file)
jao-doc-view--goer (or goto-page 'jao-doc-view-goto-page))
(imenu-add-to-menubar "PDF outline"))
(defun jao-doc-view--imenu-create-index ()
(let (index)
(dolist (item (or jao--pdf-outline
(setq jao--pdf-outline
(jao-doc-view-pdf-outline jao-doc-view--imenu-file))))
(let-alist item
(let* ((lvl (make-string (max 0 (1- .level)) ?.))
(title (format "%s%s (%s)" lvl .title .page)))
(push `(,title 0 jao-doc-view--go ,item) index))))
(nreverse index)))
(defun jao-doc-view--go (&rest args)
(when-let (item (car (last args)))
(let-alist item (funcall jao-doc-view--goer .page))))
(add-hook 'doc-view-mode-hook #'jao-doc-view--enable-imenu)
;;; Page trailing
(defvar-local jao-doc-view--trail-back ())
(defvar-local jao-doc-view--trail-fwd ())
(defun jao-doc-view--trail-push (dest-page)
(when-let (page (jao-doc-view-current-page))
(unless (eq (car jao-doc-view--trail-back) page)
(push page jao-doc-view--trail-back))))
(defun jao-doc-view-back ()
(interactive nil doc-view-mode)
(if-let (p (pop jao-doc-view--trail-back))
(progn (push (jao-doc-view-current-page) jao-doc-view--trail-fwd)
(jao-doc-view-goto-page p))
(message "No more back marks.")))
(defun jao-doc-view-forward ()
(interactive nil doc-view-mode)
(if-let (p (pop jao-doc-view--trail-fwd))
(progn (push (jao-doc-view-current-page) jao-doc-view--trail-back)
(jao-doc-view-goto-page p))
(message "No more forward marks.")))
(advice-add 'doc-view-goto-page :before #'jao-doc-view--trail-push)
;;; Find URLs
(defun jao-doc-view--page-urls (all)
(if doc-view--current-converter-processes
(message "DocView: please wait till conversion finished.")
(let ((txt (expand-file-name "doc.txt" (doc-view--current-cache-dir)))
(page (doc-view-current-page))
(pd-rx (rx (+ (literal page-delimiter))))
(urls))
(if (file-readable-p txt)
(with-current-buffer (find-file-noselect txt)
(goto-char (point-min))
(unless all (re-search-forward pd-rx nil t (1- page)))
(let ((end (save-excursion
(if (and (not all) (re-search-forward pd-rx nil t))
(point)
(point-max)))))
(while (re-search-forward "https?://" end t)
(push (thing-at-point-url-at-point) urls))
urls))
(doc-view-doc->txt txt (lambda () (jao-doc-view--page-urls all)))
'wait))))
(defun jao-doc-view-visit-url (all)
"Visit URL displayed in this page."
(interactive "P" doc-view-mode)
(let ((urls (jao-doc-view--page-urls all)))
(cond ((eq 'wait urls) (message "Extracting text, please wait and retry."))
((zerop (length urls)) (message "No URLs in this page"))
(t (when-let (url (completing-read "URL: " urls nil nil
(when (null (cdr urls)) (car urls))))
(browse-url url))))))
;;; .
(provide 'jao-doc-view)
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