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;;; jao-eww-session.el --- Persistent eww sessions -*- lexical-binding: t; -*-
;; Copyright (C) 2003-2004, 2006-2009, 2012, 2021-2022, 2025-2026 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.
;;; Code:
;;; Dependencies:
(require 'eww)
(require 'url)
(require 'multisession)
;;; Internals:
;;;; auxiliary functions
(define-multisession-variable jao-eww-session '(0))
(defun jao-eww-session--current (&optional s)
(when s (setf (multisession-value jao-eww-session) s))
(multisession-value jao-eww-session))
(defun jao-eww-session-eww-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--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-eww-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)
(mapcar 'car (cadr (or s (jao-eww-session--current)))))
(defun jao-eww-session-offset (&optional s)
(car (or s (jao-eww-session--current))))
(defun jao-eww-session-titles (&optional s)
(let ((s (or s jao-eww-current-session)))
(mapcar 'cdr (cadr s))))
(defun jao-eww-session--update ()
(jao-eww-session--current (jao-eww-session--current-urls)))
(defun jao-eww-session--find-dups (urls)
(seq-filter
(lambda (b)
(with-current-buffer b (member (jao-eww--current-url) urls)))
(jao-eww-session-eww-buffers)))
;;;; save session on checkpoints
(add-hook 'eww-after-render-hook #'jao-eww-session--update)
(advice-add 'eww-back-url :after #'jao-eww-session--update)
(advice-add 'eww-forward-url :after #'jao-eww-session--update)
(defun jao-eww-buffer-title () (plist-get eww-data :title))
(defun jao-eww-session-load ()
"Load last stored session into eww."
(interactive)
(let* ((urls (jao-eww-session-urls))
(offset (jao-eww-session-offset))
(dups (jao-eww-session--find-dups urls)))
(dolist (url urls) (eww url 4))
(seq-each #'kill-buffer dups)
(unless (zerop offset)
(switch-to-buffer (nth offset (jao-eww-session-eww-buffers))))))
(provide 'jao-eww-session)
;;; jao-eww-session.el ends here
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