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+;; jao-doc-view.el -- Remembering visited documents
+
+;; Copyright (c) 2013, 2015, 2017, 2018, 2019 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
+
+;;; Comentary:
+
+;; Some utilities to keep track of visited documents and the last
+;; visited page.
+
+;;; Code:
+
+(defvar jao-doc-view-bmk-file "~/.emacs.d/doc-view-bmk")
+(defvar jao-doc-view-session-file "~/.emacs.d/doc-view-session")
+(defvar jao-doc-view--current-bmks nil)
+
+(defun jao-doc-view--read-file (file)
+  (let ((buff (find-file-noselect file)))
+    (ignore-errors
+      (with-current-buffer buff
+        (goto-char (point-min)))
+      (read buff))))
+
+(defun jao-doc-view--save-to-file (file value)
+  (with-current-buffer (find-file-noselect file)
+    (erase-buffer)
+    (insert (format "%S" value))
+    (save-buffer)))
+
+(defun jao-doc-view--read-bmks ()
+  (let ((bmks (jao-doc-view--read-file jao-doc-view-bmk-file)))
+    (if (hash-table-p bmks) bmks (make-hash-table :test 'equal))))
+
+(defun jao-doc-view--current-bmks ()
+  (or jao-doc-view--current-bmks
+      (setq jao-doc-view--current-bmks (jao-doc-view--read-bmks))))
+
+(defun jao-doc-view-purge-bmks ()
+  (interactive)
+  (when jao-doc-view--current-bmks
+    (maphash (lambda (k v)
+               (when (or (not k) (= 1 v) (not (file-exists-p k)))
+                 (remhash k jao-doc-view--current-bmks)))
+             jao-doc-view--current-bmks)))
+
+(defun jao-doc-view-goto-bmk ()
+  (interactive)
+  (when (eq major-mode 'pdf-view-mode)
+    (let* ((bmks (jao-doc-view--current-bmks))
+           (fname (buffer-file-name))
+           (p (when fname (gethash (expand-file-name fname) bmks 1))))
+      (when (and (numberp p) (> p 1))
+        (message "Found bookmark at page %d" p)
+        (ignore-errors (pdf-view-goto-page p))))))
+
+(defun jao-doc-view-open (file)
+  (let* ((buffs (buffer-list))
+         (b (catch 'done
+              (while buffs
+                (when (string-equal (buffer-file-name (car buffs)) file)
+                  (throw 'done (car buffs)))
+                (setq buffs (cdr buffs))))))
+    (if b
+        (pop-to-buffer b)
+      (when (file-exists-p file) (find-file file)))))
+
+(defun jao-doc-view-session (&optional file)
+  (let ((file (or file jao-doc-view-session-file)))
+    (jao-doc-view--read-file file)))
+
+(defun jao-doc-view-load-session (&optional file)
+  (interactive)
+  (let ((docs (jao-doc-view-session file)))
+    (when (not (listp docs)) (error "Empty session"))
+    (dolist (d docs) (other-window 1) (jao-doc-view-open d))))
+
+(defun jao-doc-view--save-bmks ()
+  (jao-doc-view-purge-bmks)
+  (jao-doc-view--save-to-file jao-doc-view-bmk-file
+                              (jao-doc-view--current-bmks)))
+
+(defun jao-doc-view--save-bmk (&rest ignored)
+  (when (eq major-mode 'pdf-view-mode)
+    (ignore-errors
+      (puthash (buffer-file-name)
+               (max (pdf-view-current-page) 1)
+               (jao-doc-view--current-bmks)))))
+
+(defun jao-doc-view-save-session (&optional skip-current)
+  (interactive)
+  (let ((docs '())
+        (cb (when skip-current (current-buffer))))
+    (dolist (b (buffer-list))
+      (with-current-buffer b
+        (when (and (equalp major-mode 'pdf-view-mode)
+                   (not (equalp cb b)))
+          (jao-doc-view--save-bmk)
+          (add-to-list 'docs (buffer-file-name)))))
+    (jao-doc-view--save-bmks)
+    (when (> (length docs) 0)
+      (jao-doc-view--save-to-file jao-doc-view-session-file docs))))
+
+(defun jao-doc-view--save-session-1 ()
+  (when (equalp major-mode 'pdf-view-mode)
+    (jao-doc-view-purge-bmks)
+    (jao-doc-view-save-session t)))
+
+(defvar jao-doc-session-timer nil)
+(defvar jao-doc-session-timer-seconds 60)
+
+(defun jao-doc-view-stop-session-timer ()
+  (interactive)
+  (when jao-doc-session-timer
+    (cancel-timer jao-doc-session-timer)
+    (setq jao-doc-session-timer nil)))
+
+(defun jao-doc-view--save-session ()
+  (let ((inhibit-message t)
+        (message-log-max nil))
+    (jao-doc-view-save-session)))
+
+(defun jao-doc-view-start-session-timer ()
+  (interactive)
+  (setq jao-doc-session-timer
+        (run-with-idle-timer jao-doc-session-timer-seconds
+                             t
+                             'jao-doc-view--save-session)))
+
+(defun jao-doc-view-install ()
+  (jao-doc-view--current-bmks)
+  (add-hook 'kill-buffer-hook 'jao-doc-view--save-bmk)
+  (add-hook 'kill-buffer-hook 'jao-doc-view--save-session-1 t)
+  (add-hook 'kill-emacs-hook 'jao-doc-view-save-session)
+  (jao-doc-view-start-session-timer))
+
+
+
+(provide 'jao-doc-view)