lisp/gnus/nnslashdot.el

   1 ;;; nnslashdot.el --- interfacing with Slashdot
   2
   3 ;; Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007, 2008 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 3, 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       (when (and nnslashdot-groups (< (length (car nnslashdot-groups)) 5))
 463         (dolist (group nnslashdot-groups)
 464           (nnslashdot-make-tuple group 5))))))
 465
 466 (defun nnslashdot-write-groups ()
 467   (with-temp-file (expand-file-name "groups" nnslashdot-directory)
 468     (gnus-prin1 nnslashdot-groups)))
 469
 470 (defun nnslashdot-init (server)
 471   "Initialize buffers and such."
 472   (unless (file-exists-p nnslashdot-directory)
 473     (gnus-make-directory nnslashdot-directory))
 474   (unless (gnus-buffer-live-p nnslashdot-buffer)
 475     (setq nnslashdot-buffer
 476           (save-excursion
 477             (nnheader-set-temp-buffer
 478              (format " *nnslashdot %s*" server))))
 479     (push nnslashdot-buffer gnus-buffers)))
 480
 481 (defun nnslashdot-date-to-date (sdate)
 482   (condition-case err
 483       (let ((elem (delete "" (split-string sdate))))
 484         (concat (substring (nth 0 elem) 0 3) " "
 485                 (substring (nth 1 elem) 0 3) " "
 486                 (substring (nth 2 elem) 0 2) " "
 487                 (substring (nth 3 elem) 1 6) " "
 488                 (format-time-string "%Y") " "
 489                 (nth 4 elem)))
 490     (error "")))
 491
 492 (defun nnslashdot-generate-active ()
 493   (save-excursion
 494     (set-buffer nntp-server-buffer)
 495     (erase-buffer)
 496     (dolist (elem nnslashdot-groups)
 497       (when (numberp (cadr elem))
 498         (insert (prin1-to-string (car elem))
 499                 " " (number-to-string (cadr elem)) " 1 y\n")))))
 500
 501 (defun nnslashdot-lose (why)
 502   (error "Slashdot HTML has changed; please get a new version of nnslashdot"))
 503
 504 (provide 'nnslashdot)
 505
 506 ;; arch-tag: aa73df7a-f7e6-4eef-bdea-5ce2f8c691b3
 507 ;;; nnslashdot.el ends here