blob: 2c27c9775a615bb8631ea6bfa9c5dbf276cb3a36 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
;; -*- 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/>.
(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))
(defcustom luwak-tor-switch nil
"Switch behaviour of prefix arg concerning the use of tor.
When nil, use tor by default, and not use it with a prefix arg.
When non-nill, swap the tor-switch in prefix-arg effect."
:group 'luwak :type '(boolean))
(defun luwak-toggle-tor-switch ()
(interactive)
(setq luwak-tor-switch (not luwak-tor-switch)))
(defun luwak-mode-name ()
(concat "luwak "
(cond
((null luwak-data) "Tor unknown")
((plist-get luwak-data :no-tor) "Tor off")
(t "Tor on"))))
(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))
(define-derived-mode luwak-mode special-mode (luwak-mode-name)
"Major mode for browsing the web using lynx -dump.")
(defun luwak-open (url)
"Open URL in luwak."
(interactive "sUrl to open: ")
(luwak-open-internal
url (xor luwak-tor-switch 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)
"Search QUERY using 'luwak-search-engine'."
(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
no-tor
"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
(progn
(plist-put luwak-data :url url)
(plist-put luwak-data :no-tor no-tor))
(setq luwak-data (list :url url :no-tor no-tor :history-pos 0)))
(setq mode-name (luwak-mode-name))
(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)
|
