1;;; nnslashdot.el --- interfacing with Slashdot
2
3;; Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004,
4;;   2005, 2006, 2007 Free Software Foundation, Inc.
5
6;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
7;; Keywords: news
8
9;; This file is part of GNU Emacs.
10
11;; GNU Emacs is free software; you can redistribute it and/or modify
12;; it under the terms of the GNU General Public License as published by
13;; the Free Software Foundation; either version 2, or (at your option)
14;; any later version.
15
16;; GNU Emacs is distributed in the hope that it will be useful,
17;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19;; GNU General Public License for more details.
20
21;; You should have received a copy of the GNU General Public License
22;; along with GNU Emacs; see the file COPYING.  If not, write to the
23;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
24;; Boston, MA 02110-1301, USA.
25
26;;; Commentary:
27
28;;; Code:
29
30(eval-when-compile (require 'cl))
31
32(require 'nnoo)
33(require 'message)
34(require 'gnus-util)
35(require 'gnus)
36(require 'nnmail)
37(require 'mm-util)
38(require 'mm-url)
39
40(nnoo-declare nnslashdot)
41
42(defvoo nnslashdot-directory (nnheader-concat gnus-directory "slashdot/")
43  "Where nnslashdot will save its files.")
44
45(defvoo nnslashdot-active-url "http://slashdot.org/search.pl?section=&min=%d"
46  "Where nnslashdot will fetch the active file from.")
47
48(defvoo nnslashdot-comments-url "http://slashdot.org/comments.pl?sid=%s&threshold=%d&commentsort=%d&mode=flat&startat=%d"
49  "Where nnslashdot will fetch comments from.")
50
51(defvoo nnslashdot-article-url
52    "http://slashdot.org/article.pl?sid=%s&mode=nocomment"
53  "Where nnslashdot will fetch the article from.")
54
55(defvoo nnslashdot-backslash-url "http://slashdot.org/slashdot.xml"
56  "Where nnslashdot will fetch the stories from.")
57
58(defvoo nnslashdot-use-front-page nil
59  "Use the front page in addition to the backslash page.")
60
61(defvoo nnslashdot-threshold -1
62  "The article threshold.")
63
64(defvoo nnslashdot-threaded t
65  "Whether the nnslashdot groups should be threaded or not.")
66
67(defvoo nnslashdot-group-number 0
68  "The number of non-fresh groups to keep updated.")
69
70(defvoo nnslashdot-login-name ""
71  "The login name to use when posting.")
72
73(defvoo nnslashdot-password ""
74  "The password to use when posting.")
75
76;;; Internal variables
77
78(defvar nnslashdot-groups nil)
79(defvar nnslashdot-buffer nil)
80(defvar nnslashdot-headers nil)
81
82;;; Interface functions
83
84(nnoo-define-basics nnslashdot)
85
86(deffoo nnslashdot-retrieve-headers (articles &optional group server fetch-old)
87  (nnslashdot-possibly-change-server group server)
88  (condition-case why
89      (unless gnus-nov-is-evil
90 	(nnslashdot-retrieve-headers-1 articles group))
91    (search-failed (nnslashdot-lose why))))
92
93(deffoo nnslashdot-retrieve-headers-1 (articles group)
94  (let* ((last (car (last articles)))
95	 (start (if nnslashdot-threaded 1 (pop articles)))
96	 (entry (assoc group nnslashdot-groups))
97	 (sid (nth 2 entry))
98	 (first-comments t)
99	 headers article subject score from date lines parent point cid
100	 s startats changed)
101    (save-excursion
102      (set-buffer nnslashdot-buffer)
103      (let ((case-fold-search t))
104	(erase-buffer)
105	(when (= start 1)
106	  (mm-url-insert (format nnslashdot-article-url sid) t)
107	  (goto-char (point-min))
108	  (if (eobp)
109	      (error "Couldn't open connection to slashdot"))
110	  (re-search-forward "Posted by[ \t\r\n]+")
111	  (when (looking-at "\\(<a[^>]+>\\)?[ \t\r\n]*\\([^<\r\n]+\\)")
112	    (setq from (mm-url-decode-entities-string (match-string 2))))
113	  (search-forward "on ")
114	  (setq date (nnslashdot-date-to-date
115		      (buffer-substring (point) (1- (search-forward "<")))))
116	  (setq lines (/ (- (point)
117			    (progn (forward-line 1) (point)))
118			 60))
119	  (push
120	   (cons
121	    1
122	    (make-full-mail-header
123	     1 group from date
124	     (concat "<" sid "%1@slashdot>")
125	     "" 0 lines nil nil))
126	   headers)
127	  (setq start (if nnslashdot-threaded 2 (pop articles))))
128	(while (and start (<= start last))
129	  (setq point (goto-char (point-max)))
130	  (mm-url-insert
131	   (format nnslashdot-comments-url sid
132		   nnslashdot-threshold 0 (- start 2))
133	   t)
134	  (when (and nnslashdot-threaded first-comments)
135	    (setq first-comments nil)
136	    (goto-char (point-max))
137	    (while (re-search-backward "startat=\\([0-9]+\\)" nil t)
138	      (setq s (string-to-number (match-string 1)))
139	      (unless (memq s startats)
140		(push s startats)))
141	    (setq startats (sort startats '<)))
142	  (setq article (if (and article (< start article)) article start))
143	  (goto-char point)
144	  (while (re-search-forward
145		  "<a name=\"\\([0-9]+\\)\">\\([^<]+\\)\\(?:.*\n\\)\\{2,10\\}.*score:\\([^)]+\\))"
146		  nil t)
147	    (setq cid (match-string 1)
148		  subject (match-string 2)
149		  score (match-string 3))
150	    (unless (assq article (nth 4 entry))
151	      (setcar (nthcdr 4 entry) (cons (cons article cid) (nth 4 entry)))
152	      (setq changed t))
153	    (when (string-match "^Re: *" subject)
154	      (setq subject (concat "Re: " (substring subject (match-end 0)))))
155	    (setq subject (mm-url-decode-entities-string subject)
156		  from "")
157	    (when (re-search-forward "by[ \t\n]+<[^>]+>\\([^<(]+\\)" nil t)
158	      (setq from
159		    (concat
160		     (mm-url-decode-entities-string (match-string 1))
161		     " <nobody@slashdot.org>")))
162	    (search-forward "on ")
163	    (setq date
164		  (nnslashdot-date-to-date
165		   (buffer-substring
166		    (point) (progn (skip-chars-forward "^()<>\n\r") (point)))))
167	    (setq lines (/ (abs (- (search-forward "<div")
168				   (search-forward "</div>")))
169			   70))
170	    (if (not
171		 (re-search-forward ".*cid=\\([0-9]+\\)\">Parent</A>" nil t))
172		(setq parent nil)
173	      (setq parent (match-string 1))
174	      (when (string= parent "0")
175		(setq parent nil)))
176	    (push
177	     (cons
178	      article
179	      (make-full-mail-header
180	       article
181	       (concat subject " (" score ")")
182	       from date
183	       (concat "<" sid "%" cid "@slashdot>")
184	       (if parent
185		   (concat "<" sid "%" parent "@slashdot>")
186		 "")
187	       0 lines nil nil))
188	     headers)
189	    (while (and articles (<= (car articles) article))
190	      (pop articles))
191	    (setq article (1+ article)))
192	  (if nnslashdot-threaded
193	      (progn
194		(setq start (pop startats))
195		(if start (setq start (+ start 2))))
196	    (setq start (pop articles))))))
197    (if changed (nnslashdot-write-groups))
198    (setq nnslashdot-headers (sort headers 'car-less-than-car))
199    (save-excursion
200      (set-buffer nntp-server-buffer)
201      (erase-buffer)
202      (mm-with-unibyte-current-buffer
203       (dolist (header nnslashdot-headers)
204	 (nnheader-insert-nov (cdr header)))))
205    'nov))
206
207(deffoo nnslashdot-request-group (group &optional server dont-check)
208  (nnslashdot-possibly-change-server nil server)
209  (let ((elem (assoc group nnslashdot-groups)))
210    (cond
211     ((not elem)
212      (nnheader-report 'nnslashdot "Group does not exist"))
213     (t
214      (nnheader-report 'nnslashdot "Opened group %s" group)
215      (nnheader-insert
216       "211 %d %d %d %s\n" (cadr elem) 1 (cadr elem)
217       (prin1-to-string group))))))
218
219(deffoo nnslashdot-close-group (group &optional server)
220  (nnslashdot-possibly-change-server group server)
221  (when (gnus-buffer-live-p nnslashdot-buffer)
222    (save-excursion
223      (set-buffer nnslashdot-buffer)
224      (kill-buffer nnslashdot-buffer)))
225  t)
226
227(deffoo nnslashdot-request-article (article &optional group server buffer)
228  (nnslashdot-possibly-change-server group server)
229  (let (contents cid)
230    (condition-case why
231	(save-excursion
232	  (set-buffer nnslashdot-buffer)
233	  (let ((case-fold-search t))
234	    (goto-char (point-min))
235	    (when (and (stringp article)
236		       (string-match "%\\([0-9]+\\)@" article))
237	      (setq cid (match-string 1 article))
238	      (let ((map (nth 4 (assoc group nnslashdot-groups))))
239		(while map
240		  (if (equal (cdar map) cid)
241		      (setq article (caar map)
242			    map nil)
243		    (setq map (cdr map))))))
244	    (when (numberp article)
245	      (if (= article 1)
246		  (progn
247		    (search-forward "Posted by")
248		    (search-forward "<div class=\"intro\">")
249		    (setq contents
250			  (buffer-substring
251			   (point)
252			   (progn
253			     (search-forward "commentwrap")
254			     (match-beginning 0)))))
255		(setq cid (cdr (assq article
256				     (nth 4 (assoc group nnslashdot-groups)))))
257		(search-forward (format "<a name=\"%s\">" cid))
258		(setq contents
259		      (buffer-substring
260		       (search-forward "<div class=\"commentBody\">")
261		       (progn
262			 (search-forward "<div class=\"commentSub\"")
263			 (match-beginning 0))))))))
264      (search-failed (nnslashdot-lose why)))
265
266    (when contents
267      (save-excursion
268	(set-buffer (or buffer nntp-server-buffer))
269	(erase-buffer)
270	(mm-with-unibyte-current-buffer
271	  (insert contents)
272	  (goto-char (point-min))
273	  (while (re-search-forward "\\(<br>\r?\\)+" nil t)
274	    (replace-match "<p>" t t))
275	  (goto-char (point-min))
276	  (insert "Content-Type: text/html\nMIME-Version: 1.0\n")
277	  (insert "Newsgroups: " (caddr (assoc group nnslashdot-groups))
278		  "\n")
279	  (let ((header (cdr (assq article nnslashdot-headers))))
280	    (nnheader-insert-header header))
281	  (nnheader-report 'nnslashdot "Fetched article %s" article))
282	(cons group article)))))
283
284(deffoo nnslashdot-close-server (&optional server)
285  (when (and (nnslashdot-server-opened server)
286	     (gnus-buffer-live-p nnslashdot-buffer))
287    (save-excursion
288      (set-buffer nnslashdot-buffer)
289      (kill-buffer nnslashdot-buffer)))
290  (nnoo-close-server 'nnslashdot server))
291
292(deffoo nnslashdot-request-list (&optional server)
293  (nnslashdot-possibly-change-server nil server)
294  (let ((number 0)
295	(first nnslashdot-use-front-page)
296	sid elem description articles gname)
297    (condition-case why
298	;; First we do the Ultramode to get info on all the latest groups.
299	(progn
300	  (mm-with-unibyte-buffer
301	    (mm-url-insert nnslashdot-backslash-url t)
302	    (goto-char (point-min))
303	    (if (eobp)
304		(error "Couldn't open connection to slashdot"))
305	    (while (search-forward "<story>" nil t)
306	      (narrow-to-region (point) (search-forward "</story>"))
307	      (goto-char (point-min))
308	      (re-search-forward "<title>\\([^<]+\\)</title>")
309	      (setq description
310		    (mm-url-decode-entities-string (match-string 1)))
311	      (re-search-forward "<url>\\([^<]+\\)</url>")
312	      (setq sid (match-string 1))
313	      (string-match "sid=\\([0-9/]+\\)\\(.shtml\\|$\\)" sid)
314	      (setq sid (match-string 1 sid))
315	      (re-search-forward "<comments>\\([^<]+\\)</comments>")
316	      (setq articles (string-to-number (match-string 1)))
317	      (setq gname (concat description " (" sid ")"))
318	      (if (setq elem (assoc gname nnslashdot-groups))
319		  (setcar (cdr elem) articles)
320		(push (list gname articles sid (current-time) nil)
321		      nnslashdot-groups))
322	      (goto-char (point-max))
323	      (widen)))
324	  ;; Then do the older groups.
325	  (while (or first
326		     (> (- nnslashdot-group-number number) 0))
327  	    (setq first nil)
328	    (mm-with-unibyte-buffer
329	      (let ((case-fold-search t))
330		(mm-url-insert (format nnslashdot-active-url number) t)
331		(goto-char (point-min))
332		(while (re-search-forward
333			"article.pl\\?sid=\\([^&]+\\).*>\\([^<]+\\)</a>"
334			nil t)
335		  (setq sid (match-string 1)
336			description
337			(mm-url-decode-entities-string (match-string 2)))
338		  (forward-line 1)
339		  (when (re-search-forward "with \\([0-9]+\\) comment" nil t)
340		    (setq articles (1+ (string-to-number (match-string 1)))))
341		  (setq gname (concat description " (" sid ")"))
342		  (if (setq elem (assoc gname nnslashdot-groups))
343		      (setcar (cdr elem) articles)
344		    (push (list gname articles sid (current-time) nil)
345			  nnslashdot-groups)))))
346	    (incf number 30)))
347      (search-failed (nnslashdot-lose why)))
348    (nnslashdot-write-groups)
349    (nnslashdot-generate-active)
350    t))
351
352(deffoo nnslashdot-request-newgroups (date &optional server)
353  (nnslashdot-possibly-change-server nil server)
354  (nnslashdot-generate-active)
355  t)
356
357(deffoo nnslashdot-request-post (&optional server)
358  (nnslashdot-possibly-change-server nil server)
359  (let ((sid (message-fetch-field "newsgroups"))
360	(subject (message-fetch-field "subject"))
361	(references (car (last (split-string
362				(message-fetch-field "references")))))
363	body quoted pid)
364    (string-match "%\\([0-9]+\\)@slashdot" references)
365    (setq pid (match-string 1 references))
366    (message-goto-body)
367    (narrow-to-region (point) (progn (message-goto-signature) (point)))
368    (goto-char (point-min))
369    (while (not (eobp))
370      (if (looking-at "> ")
371	  (progn
372	    (delete-region (point) (+ (point) 2))
373	    (unless quoted
374	      (insert "<blockquote>\n"))
375	    (setq quoted t))
376	(when quoted
377	  (insert "</blockquote>\n")
378	  (setq quoted nil)))
379      (forward-line 1))
380    (goto-char (point-min))
381    (while (re-search-forward "^ *\n" nil t)
382      (replace-match "<p>\n"))
383    (widen)
384    (when (message-goto-signature)
385      (forward-line -1)
386      (insert "<p>\n")
387      (while (not (eobp))
388	(end-of-line)
389	(insert "<br>")
390	(forward-line 1)))
391    (message-goto-body)
392    (setq body (buffer-substring (point) (point-max)))
393    (erase-buffer)
394    (mm-url-fetch-form
395     "http://slashdot.org/comments.pl"
396     `(("sid" . ,sid)
397       ("pid" . ,pid)
398       ("rlogin" . "userlogin")
399       ("unickname" . ,nnslashdot-login-name)
400       ("upasswd" . ,nnslashdot-password)
401       ("postersubj" . ,subject)
402       ("op" . "Submit")
403       ("postercomment" . ,body)
404       ("posttype" . "html")))))
405
406(deffoo nnslashdot-request-delete-group (group &optional force server)
407  (nnslashdot-possibly-change-server group server)
408  (setq nnslashdot-groups (delq (assoc group nnslashdot-groups)
409				nnslashdot-groups))
410  (nnslashdot-write-groups))
411
412(deffoo nnslashdot-request-close ()
413  (setq nnslashdot-headers nil
414	nnslashdot-groups nil))
415
416(deffoo nnslashdot-request-expire-articles
417    (articles group &optional server force)
418  (nnslashdot-possibly-change-server group server)
419  (let ((item (assoc group nnslashdot-groups)))
420    (when item
421      (if (fourth item)
422	  (when (and (>= (length articles) (cadr item)) ;; All are expirable.
423		     (nnmail-expired-article-p
424		      group
425		      (fourth item)
426		      force))
427	    (setq nnslashdot-groups (delq item nnslashdot-groups))
428	    (nnslashdot-write-groups)
429	    (setq articles nil)) ;; all expired.
430	(setcdr (cddr item) (list (current-time)))
431	(nnslashdot-write-groups))))
432  articles)
433
434(nnoo-define-skeleton nnslashdot)
435
436;;; Internal functions
437
438(defun nnslashdot-possibly-change-server (&optional group server)
439  (nnslashdot-init server)
440  (when (and server
441	     (not (nnslashdot-server-opened server)))
442    (nnslashdot-open-server server))
443  (unless nnslashdot-groups
444    (nnslashdot-read-groups)))
445
446(defun nnslashdot-make-tuple (tuple n)
447  (prog1
448      tuple
449    (while (> n 1)
450      (unless (cdr tuple)
451	(setcdr tuple (list nil)))
452      (setq tuple (cdr tuple)
453	    n (1- n)))))
454
455(defun nnslashdot-read-groups ()
456  (let ((file (expand-file-name "groups" nnslashdot-directory)))
457    (when (file-exists-p file)
458      (mm-with-unibyte-buffer
459	(insert-file-contents file)
460	(goto-char (point-min))
461	(setq nnslashdot-groups (read (current-buffer))))
462      (if (and nnslashdot-groups (< (length (car nnslashdot-groups)) 5))
463	  (let ((groups nnslashdot-groups))
464	    (while groups
465	      (nnslashdot-make-tuple (car groups) 5)
466	      (setq groups (cdr groups))))))))
467
468(defun nnslashdot-write-groups ()
469  (with-temp-file (expand-file-name "groups" nnslashdot-directory)
470    (gnus-prin1 nnslashdot-groups)))
471
472(defun nnslashdot-init (server)
473  "Initialize buffers and such."
474  (unless (file-exists-p nnslashdot-directory)
475    (gnus-make-directory nnslashdot-directory))
476  (unless (gnus-buffer-live-p nnslashdot-buffer)
477    (setq nnslashdot-buffer
478	  (save-excursion
479	    (nnheader-set-temp-buffer
480	     (format " *nnslashdot %s*" server))))
481    (push nnslashdot-buffer gnus-buffers)))
482
483(defun nnslashdot-date-to-date (sdate)
484  (condition-case err
485      (let ((elem (delete "" (split-string sdate))))
486	(concat (substring (nth 0 elem) 0 3) " "
487		(substring (nth 1 elem) 0 3) " "
488		(substring (nth 2 elem) 0 2) " "
489		(substring (nth 3 elem) 1 6) " "
490		(format-time-string "%Y") " "
491		(nth 4 elem)))
492    (error "")))
493
494(defun nnslashdot-generate-active ()
495  (save-excursion
496    (set-buffer nntp-server-buffer)
497    (erase-buffer)
498    (dolist (elem nnslashdot-groups)
499      (when (numberp (cadr elem))
500	(insert (prin1-to-string (car elem))
501		" " (number-to-string (cadr elem)) " 1 y\n")))))
502
503(defun nnslashdot-lose (why)
504  (error "Slashdot HTML has changed; please get a new version of nnslashdot"))
505
506(provide 'nnslashdot)
507
508;;; arch-tag: aa73df7a-f7e6-4eef-bdea-5ce2f8c691b3
509;;; nnslashdot.el ends here
510