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;;; jao-eww-session.el --- Persistent eww sessions -*- lexical-binding: t; -*-
;; Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2012, 2021 Jose A Ortega Ruiz
;; Author: Jose A Ortega Ruiz <jao@gnu.org>
;; Version: 0.4
;; Keywords: hypermedia, eww, WWW
;; 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, 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 GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;; jao-eww-session provides persistent eww browsing sessions. When
;; quitting eww (or, if you request it, at any other time while using
;; it) you can save the current eww session (that is, the set of open
;; tabs and the URLs they're visiting). Upon restarting emacs, you'll
;; have the possibity of recovering the saved session (that is, of
;; re-opening the saved tabs and URLs). You also have at your disposal
;; a command to recover the saved session at any other time, via the
;; commands:
;;
;; jao-eww-session-load -- load the last stored session
;; jao-eww-session-save -- save the current session
;;
;; A customization group, jao-eww-session, is available. There you can
;; customize the following variables:
;;; Code:
;;; Dependencies:
(require 'eww)
(require 'url)
;;; Custom variables:
(defgroup jao-eww-session nil
"eww - session saving in eww."
:group 'eww
:prefix "jao-eww-session-")
(defcustom jao-eww-session-save-always nil
"If on, always save eww session without asking."
:type 'boolean)
(defcustom jao-eww-session-load-always nil
"If on, always load eww session without asking."
:type 'boolean)
(defcustom jao-eww-session-show-titles t
"If on, show URL titles in the load prompt."
:type 'boolean)
(defcustom jao-eww-session-duplicate-tabs 'never
"How to treat session URL already being visited.
When loading a session with `jao-eww-session-load', if one of the URLs in
the session is already displayed in a eww tab, jao-eww-session can:
- `never' create a new tab (just reload it), or
- `always' duplicate the URL in a new tab, or
- `ask' the user what to do."
:type '(choice (const :value never)
(const :value always)
(const :value ask)))
(defcustom jao-eww-session-file "~/.emacs.d/eww-session.eld"
"File to save the eww session data."
:type 'file)
;;; Internals:
;;;; auxiliary functions
(defvar jao-eww-current-session '(jao-eww-session 0 nil))
(defun jao-eww-session--list-buffers (&optional skip)
(seq-filter (lambda (b)
(when (not (eq b skip))
(with-current-buffer b (derived-mode-p 'eww-mode))))
(buffer-list)))
(defun jao-eww-session-invisible-buffers ()
(seq-filter (lambda (b) (null (get-buffer-window b)))
(jao-eww-session--list-buffers (current-buffer))))
(defun jao-eww--current-url ()
(when-let (url (eww-current-url)) (url-encode-url url)))
(defun jao-eww-session--current-urls (&optional skip-current)
(let ((urls)
(cb (current-buffer))
(pos 0)
(count 0))
(dolist (b (jao-eww-session--list-buffers (when skip-current cb))
(list pos (reverse urls)))
(set-buffer b)
(when-let (url (jao-eww--current-url))
(when (eq b cb) (setq pos count))
(setq count (1+ count))
(push (cons url (jao-eww-buffer-title)) urls)))))
(defun jao-eww-session-urls (&optional s)
(let ((s (or s jao-eww-current-session)))
(mapcar 'car (nth 2 s))))
(defun jao-eww-session-offset (&optional s)
(let ((s (or s jao-eww-current-session)))
(nth 1 s)))
(defun jao-eww-session-titles (&optional s)
(let ((s (or s jao-eww-current-session)))
(mapcar 'cdr (nth 2 s))))
(defun jao-eww-session--update-current (&optional skip-current)
(save-current-buffer
(setq jao-eww-current-session
(cons 'jao-eww-session (jao-eww-session--current-urls skip-current)))))
(defun jao-eww-session--find-dups (urls)
(seq-filter
(lambda (b)
(with-current-buffer b
(when-let (url (jao-eww--current-url))
(when (member url urls)
(or (eq jao-eww-session-duplicate-tabs 'never)
(not (y-or-n-p (format "'%s' (%s) is already open. Duplicate? "
(jao-eww-buffer-title) url))))))))
(jao-eww-session--list-buffers)))
(defun jao-eww-session-load-aux ()
(let ((new-session (jao-eww-session-from-file
(expand-file-name jao-eww-session-file))))
(when (and new-session
(or jao-eww-session-load-always
(y-or-n-p
(if jao-eww-session-show-titles
(format "Load last eww session %S? "
(jao-eww-session-titles new-session))
"Load last eww session? "))))
(setq jao-eww-current-session new-session))))
(defun jao-eww-session-from-file (fname)
(let ((fname (jao-eww-session--check--backup fname)))
(when (file-readable-p fname)
(with-temp-buffer
(insert-file-contents fname)
(goto-char (point-min))
(let ((sexp (read (current-buffer))))
(and (equal 'jao-eww-session (car sexp)) sexp))))))
(defun jao-eww-session-not-empty () (> (length (jao-eww-session-urls)) 0))
(defun jao-eww-session--to--file (filename &optional skip)
(require 'pp)
(when (jao-eww-session-not-empty)
(let ((inhibit-message t)
(session (jao-eww-session--update-current skip)))
(with-temp-buffer
(insert ";;;; File generated by jao-eww-session. DO NOT EDIT!\n")
(pp session (current-buffer))
(insert "\n" ";;;; End of "
(file-name-nondirectory jao-eww-session-file) "\n")
(write-region (point-min) (point-max) (expand-file-name filename))))))
(defun jao-eww-session--backup-name (fname)
(concat (expand-file-name fname) ".bak"))
(defun jao-eww-session--check--backup (fname)
(let ((bfname (jao-eww-session--backup-name fname)))
(if (and (file-newer-than-file-p bfname fname)
(y-or-n-p "A newer autosaved session exists. Use it? "))
bfname
fname)))
(defun jao-eww-session--save-backup (&optional skip)
(let ((f (jao-eww-session--backup-name jao-eww-session-file)))
(jao-eww-session--to--file f skip)))
(defun jao-eww-session--save-backup-1 ()
(when (derived-mode-p 'eww-mode) (jao-eww-session--save-backup t)))
;;;; save session on checkpoints
(add-hook 'kill-emacs-query-functions #'jao-eww-session-save)
(add-hook 'kill-buffer-hook #'jao-eww-session--save-backup-1)
(add-hook 'eww-after-render-hook #'jao-eww-session--save-backup)
(advice-add 'eww-back-url :after #'jao-eww-session--save-backup)
(advice-add 'eww-forward-url :after #'jao-eww-session--save-backup)
;;;###autoload
(defun jao-eww-buffer-title () (plist-get eww-data :title))
;;;###autoload
(defun jao-eww-session-save ()
"Save the current eww session."
(interactive)
(when (and (jao-eww-session-not-empty)
(or jao-eww-session-save-always (y-or-n-p "Save eww session? ")))
(jao-eww-session--to--file jao-eww-session-file))
t)
;;;###autoload
(defun jao-eww-session-load ()
"Load last stored session into eww."
(interactive)
(when-let ((s (jao-eww-session-load-aux)))
(let* ((urls (jao-eww-session-urls s))
(offset (jao-eww-session-offset s))
(buffers (unless (equal jao-eww-session-duplicate-tabs 'always)
(jao-eww-session--find-dups urls))))
(dolist (url urls) (eww url 4))
(seq-each #'kill-buffer buffers)
(unless (zerop offset)
(switch-to-buffer (nth offset (jao-eww-session--list-buffers)))))))
(provide 'jao-eww-session)
;;; jao-eww-session.el ends here
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