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;; -*- lexical-binding: t; -*-
;; Copyright (C) 2022 Yuchen Pei.
;;
;; This file is part of luwak.
;;
;; luwak is free software: you can redistribute it and/or modify it under
;; the terms of the GNU Affero General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;;
;; luwak 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 Affero General
;; Public License for more details.
;;
;; You should have received a copy of the GNU Affero General Public
;; License along with luwak. If not, see <https://www.gnu.org/licenses/>.
(require 'eww)
(defvar luwak-buffer "*luwak*")
(defvar-local luwak-data nil)
(defvar-local luwak-history nil)
(defun luwak-lynx-buffer (url) (format "*luwak-lynx %s*" url))
(defcustom luwak-search-engine "https://html.duckduckgo.com/html?q=%s"
"Default search engine for use in 'luwak-search'."
:group 'luwak :type '(string))
(defcustom luwak-url-rewrite-function 'identity
"Function to rewrite url before loading."
:group 'luwak :type '(function))
(define-derived-mode luwak-mode special-mode "luwak"
"Major mode for browsing the web using lynx -dump.")
(defvar luwak-mode-map
(let ((kmap (make-sparse-keymap)))
(define-key kmap "\t" 'forward-button)
(define-key kmap [backtab] 'backward-button)
(define-key kmap "g" 'luwak-reload)
(define-key kmap "l" 'luwak-history-backward)
(define-key kmap "r" 'luwak-history-forward)
(define-key kmap "w" 'luwak-copy-url)
(define-key kmap "o" 'luwak-open)
(define-key kmap "s" 'luwak-search)
kmap))
(defun luwak-open (url)
(interactive "sUrl to open: ")
(setq url (eww--dwim-expand-url url))
(luwak-open-internal url current-prefix-arg 'luwak-add-to-history))
(defun luwak-copy-url ()
(interactive)
(when-let ((url (or (get-text-property (point) 'url)
(plist-get luwak-data :url))))
(kill-new url)
(message "Copied: %s" url)))
(defun luwak-search (query)
(interactive "sLuwak search query: ")
(luwak-open (format luwak-search-engine query)))
(defun luwak-open-internal (url no-tor &optional cb)
(setq url (funcall luwak-url-rewrite-function url))
(message "Loading %s..." url)
(set-process-sentinel
(luwak-start-process-with-torsocks
current-prefix-arg
"luwak-lynx" (luwak-lynx-buffer url)
"lynx" "-dump" "--display_charset" "utf-8" url)
(lambda (process _)
(message "Loading %s... Done." url)
(with-current-buffer (get-buffer-create luwak-buffer)
(let ((inhibit-read-only t))
(erase-buffer)
(insert-buffer-substring (process-buffer process))
(kill-buffer (process-buffer process))
(goto-char (point-min))
(luwak-render-links (luwak-get-links)))
(unless (derived-mode-p 'luwak-mode) (luwak-mode))
(if luwak-data
(plist-put luwak-data :url url)
(setq luwak-data (list :url url :no-tor no-tor :history-pos 0)))
(when cb (funcall cb)))
(display-buffer luwak-buffer))))
(defun luwak-add-to-history ()
(let ((history-delete-duplicates nil))
(setq luwak-history (nthcdr (plist-get luwak-data :history-pos)
luwak-history))
(add-to-history 'luwak-history (plist-get luwak-data :url))
(plist-put luwak-data :history-pos 0)))
(defun luwak-history-backward ()
(interactive)
(let ((history-pos
(1+ (plist-get luwak-data :history-pos))))
(when (<= (length luwak-history) history-pos)
(error "Already at the earliest history."))
(plist-put luwak-data :history-pos history-pos)
(luwak-open-internal (nth history-pos luwak-history)
(plist-get luwak-data :no-tor))))
(defun luwak-history-forward ()
(interactive)
(let ((history-pos
(1- (plist-get luwak-data :history-pos))))
(when (< history-pos 0)
(error "Already at the latest history."))
(plist-put luwak-data :history-pos history-pos)
(luwak-open-internal (nth history-pos luwak-history)
(plist-get luwak-data :no-tor))))
(defun luwak-reload ()
(interactive)
(luwak-open-internal
(plist-get luwak-data :url)
(plist-get luwak-data :no-tor)))
(defun luwak-follow-link (marker)
(let ((url (get-text-property marker 'url)))
(luwak-open-internal
url (plist-get luwak-data :no-tor) 'luwak-add-to-history)))
(defun luwak-render-links (urls)
(with-current-buffer luwak-buffer
(save-excursion
(goto-char (point-min))
(let ((i 1))
(dolist (url urls)
(when (re-search-forward (format "\\[%d\\]" i) nil t)
(replace-match "")
(make-text-button (point) (progn (forward-sexp) (point))
'url url
'help-echo url
'action 'luwak-follow-link
'face 'button))
(setq i (1+ i)))))))
(defun luwak-get-links ()
"Get links and remove the reference section if any."
(with-current-buffer luwak-buffer
(save-excursion
(goto-char (point-min))
(when (re-search-forward "^References\n\n\\(\\ *Visible links:\n\\)?" nil t)
(let ((ref-beg (match-beginning 0))
(results))
(while (re-search-forward "^\\ *\\([0-9]+\\)\\.\\ *\\(.*\\)$" nil t)
(push (match-string 2) results))
(delete-region ref-beg (point-max))
(reverse results))))))
(defun luwak-start-process-with-torsocks (no-tor name buffer program &rest program-args)
(if no-tor
(apply 'start-process (append (list name buffer program) program-args))
(apply 'start-process
(append (list name buffer "torsocks" program) program-args))))
(provide 'luwak)
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