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, 2009 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 of the License, or
  14 ;; (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;;; Code:
  27
  28 (eval-when-compile (require 'cl))
  29
  30 (require 'nnoo)
  31 (require 'message)
  32 (require 'gnus-util)
  33 (require 'gnus)
  34 (require 'nnmail)
  35 (require 'mm-util)
  36 (require 'mm-url)
  37
  38 (nnoo-declare nnslashdot)
  39
  40 (defvoo nnslashdot-directory (nnheader-concat gnus-directory "slashdot/")
  41   "Where nnslashdot will save its files.")
  42
  43 (defvoo nnslashdot-active-url "http://slashdot.org/search.pl?section=&min=%d"
  44   "Where nnslashdot will fetch the active file from.")
  45
  46 (defvoo nnslashdot-comments-url "http://slashdot.org/comments.pl?sid=%s&threshold=%d&commentsort=%d&mode=flat&startat=%d"
  47   "Where nnslashdot will fetch comments from.")
  48
  49 (defvoo nnslashdot-article-url
  50     "http://slashdot.org/article.pl?sid=%s&mode=nocomment"
  51   "Where nnslashdot will fetch the article from.")
  52
  53 (defvoo nnslashdot-backslash-url "http://slashdot.org/slashdot.xml"
  54   "Where nnslashdot will fetch the stories from.")
  55
  56 (defvoo nnslashdot-use-front-page nil
  57   "Use the front page in addition to the backslash page.")
  58
  59 (defvoo nnslashdot-threshold -1
  60   "The article threshold.")
  61
  62 (defvoo nnslashdot-threaded t
  63   "Whether the nnslashdot groups should be threaded or not.")
  64
  65 (defvoo nnslashdot-group-number 0
  66   "The number of non-fresh groups to keep updated.")
  67
  68 (defvoo nnslashdot-login-name ""
  69   "The login name to use when posting.")
  70
  71 (defvoo nnslashdot-password ""
  72   "The password to use when posting.")
  73
  74 ;;; Internal variables
  75
  76 (defvar nnslashdot-groups nil)
  77 (defvar nnslashdot-buffer nil)
  78 (defvar nnslashdot-headers nil)
  79
  80 ;;; Interface functions
  81
  82 (nnoo-define-basics nnslashdot)
  83
  84 (deffoo nnslashdot-retrieve-headers (articles &optional group server fetch-old)
  85   (nnslashdot-possibly-change-server group server)
  86   (condition-case why
  87       (unless gnus-nov-is-evil
  88         (nnslashdot-retrieve-headers-1 articles group))
  89     (search-failed (nnslashdot-lose why))))
  90
  91 (deffoo nnslashdot-retrieve-headers-1 (articles group)
  92   (let* ((last (car (last articles)))
  93          (start (if nnslashdot-threaded 1 (pop articles)))
  94          (entry (assoc group nnslashdot-groups))
  95          (sid (nth 2 entry))
  96          (first-comments t)
  97          headers article subject score from date lines parent point cid
  98          s startats changed)
  99     (save-excursion
 100       (set-buffer nnslashdot-buffer)
 101       (let ((case-fold-search t))
 102         (erase-buffer)
 103         (when (= start 1)
 104           (mm-url-insert (format nnslashdot-article-url sid) t)
 105           (goto-char (point-min))
 106           (if (eobp)
 107               (error "Couldn't open connection to slashdot"))
 108           (re-search-forward "Posted by[ \t\r\n]+")
 109           (when (looking-at "\\(<a[^>]+>\\)?[ \t\r\n]*\\([^<\r\n]+\\)")
 110             (setq from (mm-url-decode-entities-string (match-string 2))))
 111           (search-forward "on ")
 112           (setq date (nnslashdot-date-to-date
 113                       (buffer-substring (point) (1- (search-forward "<")))))
 114           (setq lines (/ (- (point)
 115                             (progn (forward-line 1) (point)))
 116                          60))
 117           (push
 118            (cons
 119             1
 120             (make-full-mail-header
 121              1 group from date
 122              (concat "<" sid "%1@slashdot>")
 123              "" 0 lines nil nil))
 124            headers)
 125           (setq start (if nnslashdot-threaded 2 (pop articles))))
 126         (while (and start (<= start last))
 127           (setq point (goto-char (point-max)))
 128           (mm-url-insert
 129            (format nnslashdot-comments-url sid
 130                    nnslashdot-threshold 0 (- start 2))
 131            t)
 132           (when (and nnslashdot-threaded first-comments)
 133             (setq first-comments nil)
 134             (goto-char (point-max))
 135             (while (re-search-backward "startat=\\([0-9]+\\)" nil t)
 136               (setq s (string-to-number (match-string 1)))
 137               (unless (memq s startats)
 138                 (push s startats)))
 139             (setq startats (sort startats '<)))
 140           (setq article (if (and article (< start article)) article start))
 141           (goto-char point)
 142           (while (re-search-forward
 143                   "<a name=\"\\([0-9]+\\)\">\\([^<]+\\)\\(?:.*\n\\)\\{2,10\\}.*score:\\([^)]+\\))"
 144                   nil t)
 145             (setq cid (match-string 1)
 146                   subject (match-string 2)
 147                   score (match-string 3))
 148             (unless (assq article (nth 4 entry))
 149               (setcar (nthcdr 4 entry) (cons (cons article cid) (nth 4 entry)))
 150               (setq changed t))
 151             (when (string-match "^Re: *" subject)
 152               (setq subject (concat "Re: " (substring subject (match-end 0)))))
 153             (setq subject (mm-url-decode-entities-string subject)
 154                   from "")
 155             (when (re-search-forward "by[ \t\n]+<[^>]+>\\([^<(]+\\)" nil t)
 156               (setq from
 157                     (concat
 158                      (mm-url-decode-entities-string (match-string 1))
 159                      " <nobody@slashdot.org>")))
 160             (search-forward "on ")
 161             (setq date
 162                   (nnslashdot-date-to-date
 163                    (buffer-substring
 164                     (point) (progn (skip-chars-forward "^()<>\n\r") (point)))))
 165             (setq lines (/ (abs (- (search-forward "<div")
 166                                    (search-forward "</div>")))
 167                            70))
 168             (if (not
 169                  (re-search-forward ".*cid=\\([0-9]+\\)\">Parent</A>" nil t))
 170                 (setq parent nil)
 171               (setq parent (match-string 1))
 172               (when (string= parent "0")
 173                 (setq parent nil)))
 174             (push
 175              (cons
 176               article
 177               (make-full-mail-header
 178                article
 179                (concat subject " (" score ")")
 180                from date
 181                (concat "<" sid "%" cid "@slashdot>")
 182                (if parent
 183                    (concat "<" sid "%" parent "@slashdot>")
 184                  "")
 185                0 lines nil nil))
 186              headers)
 187             (while (and articles (<= (car articles) article))
 188               (pop articles))
 189             (setq article (1+ article)))
 190           (if nnslashdot-threaded
 191               (progn
 192                 (setq start (pop startats))
 193                 (if start (setq start (+ start 2))))
 194             (setq start (pop articles))))))
 195     (if changed (nnslashdot-write-groups))
 196     (setq nnslashdot-headers (sort headers 'car-less-than-car))
 197     (save-excursion
 198       (set-buffer nntp-server-buffer)
 199       (erase-buffer)
 200       (mm-with-unibyte-current-buffer
 201        (dolist (header nnslashdot-headers)
 202          (nnheader-insert-nov (cdr header)))))
 203     'nov))
 204
 205 (deffoo nnslashdot-request-group (group &optional server dont-check)
 206   (nnslashdot-possibly-change-server nil server)
 207   (let ((elem (assoc group nnslashdot-groups)))
 208     (cond
 209      ((not elem)
 210       (nnheader-report 'nnslashdot "Group does not exist"))
 211      (t
 212       (nnheader-report 'nnslashdot "Opened group %s" group)
 213       (nnheader-insert
 214        "211 %d %d %d %s\n" (cadr elem) 1 (cadr elem)
 215        (prin1-to-string group))))))
 216
 217 (deffoo nnslashdot-close-group (group &optional server)
 218   (nnslashdot-possibly-change-server group server)
 219   (when (gnus-buffer-live-p nnslashdot-buffer)
 220     (save-excursion
 221       (set-buffer nnslashdot-buffer)
 222       (kill-buffer nnslashdot-buffer)))
 223   t)
 224
 225 (deffoo nnslashdot-request-article (article &optional group server buffer)
 226   (nnslashdot-possibly-change-server group server)
 227   (let (contents cid)
 228     (condition-case why
 229         (save-excursion
 230           (set-buffer nnslashdot-buffer)
 231           (let ((case-fold-search t))
 232             (goto-char (point-min))
 233             (when (and (stringp article)
 234                        (string-match "%\\([0-9]+\\)@" article))
 235               (setq cid (match-string 1 article))
 236               (let ((map (nth 4 (assoc group nnslashdot-groups))))
 237                 (while map
 238                   (if (equal (cdar map) cid)
 239                       (setq article (caar map)
 240                             map nil)
 241                     (setq map (cdr map))))))
 242             (when (numberp article)
 243               (if (= article 1)
 244                   (progn
 245                     (search-forward "Posted by")
 246                     (search-forward "<div class=\"intro\">")
 247                     (setq contents
 248                           (buffer-substring
 249                            (point)
 250                            (progn
 251                              (search-forward "commentwrap")
 252                              (match-beginning 0)))))
 253                 (setq cid (cdr (assq article
 254                                      (nth 4 (assoc group nnslashdot-groups)))))
 255                 (search-forward (format "<a name=\"%s\">" cid))
 256                 (setq contents
 257                       (buffer-substring
 258                        (search-forward "<div class=\"commentBody\">")
 259                        (progn
 260                          (search-forward "<div class=\"commentSub\"")
 261                          (match-beginning 0))))))))
 262       (search-failed (nnslashdot-lose why)))
 263
 264     (when contents
 265       (save-excursion
 266         (set-buffer (or buffer nntp-server-buffer))
 267         (erase-buffer)
 268         (mm-with-unibyte-current-buffer
 269           (insert contents)
 270           (goto-char (point-min))
 271           (while (re-search-forward "\\(<br>\r?\\)+" nil t)
 272             (replace-match "<p>" t t))
 273           (goto-char (point-min))
 274           (insert "Content-Type: text/html\nMIME-Version: 1.0\n")
 275           (insert "Newsgroups: " (caddr (assoc group nnslashdot-groups))
 276                   "\n")
 277           (let ((header (cdr (assq article nnslashdot-headers))))
 278             (nnheader-insert-header header))
 279           (nnheader-report 'nnslashdot "Fetched article %s" article))
 280         (cons group article)))))
 281
 282 (deffoo nnslashdot-close-server (&optional server)
 283   (when (and (nnslashdot-server-opened server)
 284              (gnus-buffer-live-p nnslashdot-buffer))
 285     (save-excursion
 286       (set-buffer nnslashdot-buffer)
 287       (kill-buffer nnslashdot-buffer)))
 288   (nnoo-close-server 'nnslashdot server))
 289
 290 (deffoo nnslashdot-request-list (&optional server)
 291   (nnslashdot-possibly-change-server nil server)
 292   (let ((number 0)
 293         (first nnslashdot-use-front-page)
 294         sid elem description articles gname)
 295     (condition-case why
 296         ;; First we do the Ultramode to get info on all the latest groups.
 297         (progn
 298           (mm-with-unibyte-buffer
 299             (mm-url-insert nnslashdot-backslash-url t)
 300             (goto-char (point-min))
 301             (if (eobp)
 302                 (error "Couldn't open connection to slashdot"))
 303             (while (search-forward "<story>" nil t)
 304               (narrow-to-region (point) (search-forward "</story>"))
 305               (goto-char (point-min))
 306               (re-search-forward "<title>\\([^<]+\\)</title>")
 307               (setq description
 308                     (mm-url-decode-entities-string (match-string 1)))
 309               (re-search-forward "<url>\\([^<]+\\)</url>")
 310               (setq sid (match-string 1))
 311               (string-match "sid=\\([0-9/]+\\)\\(.shtml\\|$\\)" sid)
 312               (setq sid (match-string 1 sid))
 313               (re-search-forward "<comments>\\([^<]+\\)</comments>")
 314               (setq articles (string-to-number (match-string 1)))
 315               (setq gname (concat description " (" sid ")"))
 316               (if (setq elem (assoc gname nnslashdot-groups))
 317                   (setcar (cdr elem) articles)
 318                 (push (list gname articles sid (current-time) nil)
 319                       nnslashdot-groups))
 320               (goto-char (point-max))
 321               (widen)))
 322           ;; Then do the older groups.
 323           (while (or first
 324                      (> (- nnslashdot-group-number number) 0))
 325             (setq first nil)
 326             (mm-with-unibyte-buffer
 327               (let ((case-fold-search t))
 328                 (mm-url-insert (format nnslashdot-active-url number) t)
 329                 (goto-char (point-min))
 330                 (while (re-search-forward
 331                         "article.pl\\?sid=\\([^&]+\\).*>\\([^<]+\\)</a>"
 332                         nil t)
 333                   (setq sid (match-string 1)
 334                         description
 335                         (mm-url-decode-entities-string (match-string 2)))
 336                   (forward-line 1)
 337                   (when (re-search-forward "with \\([0-9]+\\) comment" nil t)
 338                     (setq articles (1+ (string-to-number (match-string 1)))))
 339                   (setq gname (concat description " (" sid ")"))
 340                   (if (setq elem (assoc gname nnslashdot-groups))
 341                       (setcar (cdr elem) articles)
 342                     (push (list gname articles sid (current-time) nil)
 343                           nnslashdot-groups)))))
 344             (incf number 30)))
 345       (search-failed (nnslashdot-lose why)))
 346     (nnslashdot-write-groups)
 347     (nnslashdot-generate-active)
 348     t))
 349
 350 (deffoo nnslashdot-request-newgroups (date &optional server)
 351   (nnslashdot-possibly-change-server nil server)
 352   (nnslashdot-generate-active)
 353   t)
 354
 355 (deffoo nnslashdot-request-post (&optional server)
 356   (nnslashdot-possibly-change-server nil server)
 357   (let ((sid (message-fetch-field "newsgroups"))
 358         (subject (message-fetch-field "subject"))
 359         (references (car (last (split-string
 360                                 (message-fetch-field "references")))))
 361         body quoted pid)
 362     (string-match "%\\([0-9]+\\)@slashdot" references)
 363     (setq pid (match-string 1 references))
 364     (message-goto-body)
 365     (narrow-to-region (point) (progn (message-goto-signature) (point)))
 366     (goto-char (point-min))
 367     (while (not (eobp))
 368       (if (looking-at "> ")
 369           (progn
 370             (delete-region (point) (+ (point) 2))
 371             (unless quoted
 372               (insert "<blockquote>\n"))
 373             (setq quoted t))
 374         (when quoted
 375           (insert "</blockquote>\n")
 376           (setq quoted nil)))
 377       (forward-line 1))
 378     (goto-char (point-min))
 379     (while (re-search-forward "^ *\n" nil t)
 380       (replace-match "<p>\n"))
 381     (widen)
 382     (when (message-goto-signature)
 383       (forward-line -1)
 384       (insert "<p>\n")
 385       (while (not (eobp))
 386         (end-of-line)
 387         (insert "<br>")
 388         (forward-line 1)))
 389     (message-goto-body)
 390     (setq body (buffer-substring (point) (point-max)))
 391     (erase-buffer)
 392     (mm-url-fetch-form
 393      "http://slashdot.org/comments.pl"
 394      `(("sid" . ,sid)
 395        ("pid" . ,pid)
 396        ("rlogin" . "userlogin")
 397        ("unickname" . ,nnslashdot-login-name)
 398        ("upasswd" . ,nnslashdot-password)
 399        ("postersubj" . ,subject)
 400        ("op" . "Submit")
 401        ("postercomment" . ,body)
 402        ("posttype" . "html")))))
 403
 404 (deffoo nnslashdot-request-delete-group (group &optional force server)
 405   (nnslashdot-possibly-change-server group server)
 406   (setq nnslashdot-groups (delq (assoc group nnslashdot-groups)
 407                                 nnslashdot-groups))
 408   (nnslashdot-write-groups))
 409
 410 (deffoo nnslashdot-request-close ()
 411   (setq nnslashdot-headers nil
 412         nnslashdot-groups nil))
 413
 414 (deffoo nnslashdot-request-expire-articles
 415     (articles group &optional server force)
 416   (nnslashdot-possibly-change-server group server)
 417   (let ((item (assoc group nnslashdot-groups)))
 418     (when item
 419       (if (fourth item)
 420           (when (and (>= (length articles) (cadr item)) ;; All are expirable.
 421                      (nnmail-expired-article-p
 422                       group
 423                       (fourth item)
 424                       force))
 425             (setq nnslashdot-groups (delq item nnslashdot-groups))
 426             (nnslashdot-write-groups)
 427             (setq articles nil)) ;; all expired.
 428         (setcdr (cddr item) (list (current-time)))
 429         (nnslashdot-write-groups))))
 430   articles)
 431
 432 (nnoo-define-skeleton nnslashdot)
 433
 434 ;;; Internal functions
 435
 436 (defun nnslashdot-possibly-change-server (&optional group server)
 437   (nnslashdot-init server)
 438   (when (and server
 439              (not (nnslashdot-server-opened server)))
 440     (nnslashdot-open-server server))
 441   (unless nnslashdot-groups
 442     (nnslashdot-read-groups)))
 443
 444 (defun nnslashdot-make-tuple (tuple n)
 445   (prog1
 446       tuple
 447     (while (> n 1)
 448       (unless (cdr tuple)
 449         (setcdr tuple (list nil)))
 450       (setq tuple (cdr tuple)
 451             n (1- n)))))
 452
 453 (defun nnslashdot-read-groups ()
 454   (let ((file (expand-file-name "groups" nnslashdot-directory)))
 455     (when (file-exists-p file)
 456       (mm-with-unibyte-buffer
 457         (insert-file-contents file)
 458         (goto-char (point-min))
 459         (setq nnslashdot-groups (read (current-buffer))))
 460       (when (and nnslashdot-groups (< (length (car nnslashdot-groups)) 5))
 461         (dolist (group nnslashdot-groups)
 462           (nnslashdot-make-tuple group 5))))))
 463
 464 (defun nnslashdot-write-groups ()
 465   (with-temp-file (expand-file-name "groups" nnslashdot-directory)
 466     (gnus-prin1 nnslashdot-groups)))
 467
 468 (defun nnslashdot-init (server)
 469   "Initialize buffers and such."
 470   (unless (file-exists-p nnslashdot-directory)
 471     (gnus-make-directory nnslashdot-directory))
 472   (unless (gnus-buffer-live-p nnslashdot-buffer)
 473     (setq nnslashdot-buffer
 474           (save-excursion
 475             (nnheader-set-temp-buffer
 476              (format " *nnslashdot %s*" server))))
 477     (push nnslashdot-buffer gnus-buffers)))
 478
 479 (defun nnslashdot-date-to-date (sdate)
 480   (condition-case err
 481       (let ((elem (delete "" (split-string sdate))))
 482         (concat (substring (nth 0 elem) 0 3) " "
 483                 (substring (nth 1 elem) 0 3) " "
 484                 (substring (nth 2 elem) 0 2) " "
 485                 (substring (nth 3 elem) 1 6) " "
 486                 (format-time-string "%Y") " "
 487                 (nth 4 elem)))
 488     (error "")))
 489
 490 (defun nnslashdot-generate-active ()
 491   (save-excursion
 492     (set-buffer nntp-server-buffer)
 493     (erase-buffer)
 494     (dolist (elem nnslashdot-groups)
 495       (when (numberp (cadr elem))
 496         (insert (prin1-to-string (car elem))
 497                 " " (number-to-string (cadr elem)) " 1 y\n")))))
 498
 499 (defun nnslashdot-lose (why)
 500   (error "Slashdot HTML has changed; please get a new version of nnslashdot"))
 501
 502 (provide 'nnslashdot)
 503
 504 ;; arch-tag: aa73df7a-f7e6-4eef-bdea-5ce2f8c691b3
 505 ;;; nnslashdot.el ends here