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;; jao-doc-view.el -- Remembering visited documents
;; Copyright (c) 2013, 2015, 2017 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)
(let ((ht jao-doc-view--current-bmks))
(when ht
(maphash (lambda (k v)
(when (or (= 1 v) (not (file-exists-p k)))
(remhash k ht)))
ht))))
(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))
(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) (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) (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)
(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)))
(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))
(provide 'jao-doc-view)
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