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2900b2d8 1;;; newst-backend.el --- Retrieval backend for newsticker.
2415d4c6 2
5df4f04c 3;; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
931b2f31 4;; Free Software Foundation, Inc.
2415d4c6 5
2415d4c6 6;; Author: Ulf Jasper <ulf.jasper@web.de>
2900b2d8 7;; Filename: newst-backend.el
2415d4c6
UJ		 8;; URL: http://www.nongnu.org/newsticker
9;; Keywords: News, RSS, Atom
8e39154d 10;; Time-stamp: "6. Dezember 2009, 19:15:32 (ulf)"
2415d4c6
UJ		 11
12;; ======================================================================
13
68515217
GM		 14;; This file is part of GNU Emacs.
15
2415d4c6
UJ		 16;; GNU Emacs is free software: you can redistribute it and/or modify
17;; it under the terms of the GNU General Public License as published by
18;; the Free Software Foundation, either version 3 of the License, or
19;; (at your option) any later version.
20
21;; GNU Emacs is distributed in the hope that it will be useful,
22;; but WITHOUT ANY WARRANTY; without even the implied warranty of
23;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24;; GNU General Public License for more details.
25
26;; You should have received a copy of the GNU General Public License
27;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
28
29;; ======================================================================
30
31;;; Commentary:
32
33;; See newsticker.el
34
35;; ======================================================================
36;;; Code:
37
38(require 'derived)
39(require 'xml)
40
41;; Silence warnings
2415d4c6
UJ		 42(defvar w3-mode-map)
43(defvar w3m-minor-mode-map)
44
45
46(defvar newsticker--retrieval-timer-list nil
47 "List of timers for news retrieval.
48This is an alist, each element consisting of (feed-name . timer).")
49
50(defvar newsticker--download-logos nil
51 "If non-nil download feed logos if available.")
52
53(defvar newsticker--sentinel-callback nil
54 "Function called at end of `newsticker--sentinel'.")
55
56;;;###autoload
57(defun newsticker-running-p ()
58 "Check whether newsticker is running.
59Return t if newsticker is running, nil otherwise. Newsticker is
60considered to be running if the newsticker timer list is not empty."
61 (> (length newsticker--retrieval-timer-list) 0))
62
63;; ======================================================================
64;;; Customization
65;; ======================================================================
66(defgroup newsticker nil
67 "Aggregator for RSS and Atom feeds."
68 :group 'applications)
69
70(defconst newsticker--raw-url-list-defaults
71 '(("CNET News.com"
72 "http://export.cnet.com/export/feeds/news/rss/1,11176,,00.xml")
73 ("Debian Security Advisories"
74 "http://www.debian.org/security/dsa.en.rdf")
75 ("Debian Security Advisories - Long format"
76 "http://www.debian.org/security/dsa-long.en.rdf")
77 ("Emacs Wiki"
78 "http://www.emacswiki.org/cgi-bin/wiki.pl?action=rss"
79 nil
80 3600)
81 ("Freshmeat.net"
30924b0b 82 "http://freshmeat.net/index.atom")
2415d4c6
UJ		 83 ("Kuro5hin.org"
84 "http://www.kuro5hin.org/backend.rdf")
85 ("LWN (Linux Weekly News)"
86 "http://lwn.net/headlines/rss")
2415d4c6
UJ		 87 ("NY Times: Technology"
88 "http://partners.userland.com/nytRss/technology.xml")
89 ("NY Times"
90 "http://partners.userland.com/nytRss/nytHomepage.xml")
91 ("Quote of the day"
92 "http://www.quotationspage.com/data/qotd.rss"
93 "07:00"
94 86400)
95 ("The Register"
96 "http://www.theregister.co.uk/tonys/slashdot.rdf")
97 ("slashdot"
98 "http://slashdot.org/index.rss"
99 nil
100 3600) ;/. will ban you if under 3600 seconds!
101 ("Wired News"
102 "http://www.wired.com/news_drop/netcenter/netcenter.rdf")
103 ("Heise News (german)"
104 "http://www.heise.de/newsticker/heise.rdf")
105 ("Tagesschau (german)"
106 "http://www.tagesschau.de/newsticker.rdf"
107 nil
108 1800)
109 ("Telepolis (german)"
110 "http://www.heise.de/tp/news.rdf"))
111 "Default URL list in raw form.
112This list is fed into defcustom via `newsticker--splicer'.")
113
114(defun newsticker--splicer (item)
115 "Convert ITEM for splicing into `newsticker-url-list-defaults'."
116 (let ((result (list 'list :tag (nth 0 item) (list 'const (nth 0 item))))
117 (element (cdr item)))
118 (while element
119 (setq result (append result (list (list 'const (car element)))))
120 (setq element (cdr element)))
121 result))
122
123(defun newsticker--set-customvar-retrieval (symbol value)
124 "Set retrieval related newsticker-variable SYMBOL value to VALUE.
125Calls all actions which are necessary in order to make the new
126value effective."
127 (if (or (not (boundp symbol))
128 (equal (symbol-value symbol) value))
129 (set symbol value)
130 ;; something must have changed
131 (let ((need-restart nil)
132 (new-or-changed-feeds nil)
133 (removed-feeds))
134 (cond ((eq symbol 'newsticker-retrieval-interval)
135 (setq need-restart t))
136 ((memq symbol '(newsticker-url-list-defaults newsticker-url-list))
137 (dolist (elt value)
138 (unless (member elt (symbol-value symbol))
139 (setq new-or-changed-feeds (cons elt new-or-changed-feeds))))
140 (dolist (elt (symbol-value symbol))
141 (unless (member elt value)
142 (setq removed-feeds (cons elt removed-feeds))))))
143 (cond (need-restart
144 (set symbol value)
145 (when (newsticker-running-p)
146 (message "Restarting newsticker")
147 (newsticker-stop)
148 (newsticker-start)))
149 (t
150 (dolist (feed removed-feeds)
151 (message "Stopping feed `%s'" (car feed))
152 (newsticker--stop-feed (car feed)))
153 (dolist (feed new-or-changed-feeds)
154 (message "Starting feed `%s'" (car feed))
155 (newsticker--stop-feed (car feed))
156 (newsticker--start-feed feed))
157 (unless new-or-changed-feeds
158 (when newsticker--sentinel-callback
159 (funcall newsticker--sentinel-callback)))))
160 (set symbol value))))
161
162;; ======================================================================
163;; retrieval
164(defgroup newsticker-retrieval nil
165 "Settings for news retrieval."
166 :group 'newsticker)
167
168(defcustom newsticker-url-list-defaults
169 '(("Emacs Wiki"
170 "http://www.emacswiki.org/cgi-bin/wiki.pl?action=rss"
171 nil
172 3600))
173 "A customizable list of news feeds to select from.
174These were mostly extracted from the Radio Community Server at
175http://subhonker6.userland.com/rcsPublic/rssHotlist.
176
177You may add other entries in `newsticker-url-list'."
178 :type `(set ,@(mapcar `newsticker--splicer
179 newsticker--raw-url-list-defaults))
180 :set 'newsticker--set-customvar-retrieval
181 :group 'newsticker-retrieval)
182
183(defcustom newsticker-url-list nil
184 "The news feeds which you like to watch.
185
186This alist will be used in addition to selection made customizing
187`newsticker-url-list-defaults'.
188
189This is an alist. Each element consists of two items: a LABEL and a URL,
190optionally followed by a START-TIME, INTERVAL specifier and WGET-ARGUMENTS.
191
192The LABEL gives the name of the news feed. It can be an arbitrary string.
193
194The URL gives the location of the news feed. It must point to a valid
195RSS or Atom file. The file is retrieved by calling wget, or whatever you
196specify as `newsticker-wget-name'.
197
198URL may also be a function which returns news data. In this case
199`newsticker-retrieval-method' etc. are ignored for this feed.
200
201The START-TIME can be either a string, or nil. If it is a string it
202specifies a fixed time at which this feed shall be retrieved for the
203first time. (Examples: \"11:00pm\", \"23:00\".) If it is nil (or
204unspecified), this feed will be retrieved immediately after calling
205`newsticker-start'.
206
207The INTERVAL specifies the time between retrievals for this feed. If it
208is nil (or unspecified) the default interval value as set in
209`newsticker-retrieval-interval' is used.
210
211\(newsticker.el calls `run-at-time'. The newsticker-parameters START-TIME
212and INTERVAL correspond to the `run-at-time'-parameters TIME and REPEAT.)
213
214WGET-ARGUMENTS specifies arguments for wget (see `newsticker-wget-name')
215which apply for this feed only, overriding the value of
216`newsticker-wget-arguments'."
217 :type '(repeat (list :tag "News feed"
218 (string :tag "Label")
219 (choice :tag "URI"
220 (string :tag "String")
221 (function :tag "Function"))
222 (choice :tag "Start"
223 (const :tag "Default" nil)
224 (string :tag "Fixed Time"))
225 (choice :tag "Interval"
226 (const :tag "Default" nil)
227 (const :tag "Hourly" 3600)
228 (const :tag "Daily" 86400)
229 (const :tag "Weekly" 604800)
230 (integer :tag "Interval"))
231 (choice :tag "Wget Arguments"
232 (const :tag "Default arguments" nil)
233 (repeat :tag "Special arguments" string))))
234 :set 'newsticker--set-customvar-retrieval
235 :group 'newsticker-retrieval)
236
237(defcustom newsticker-retrieval-method
238 'intern
239 "Method for retrieving news from the web, either `intern' or `extern'.
240Default value `intern' uses Emacs' built-in asynchronous download
241capabilities ('url-retrieve'). If set to `extern' the external
242program wget is used, see `newsticker-wget-name'."
243 :type '(choice :tag "Method"
244 (const :tag "Intern" intern)
245 (const :tag "Extern" extern))
246 :group 'newsticker-retrieval)
247
248(defcustom newsticker-wget-name
249 "wget"
250 "Name of the program which is called to retrieve news from the web.
251The canonical choice is wget but you may take any other program which is
252able to return the contents of a news feed file on stdout."
253 :type 'string
254 :group 'newsticker-retrieval)
255
256(defcustom newsticker-wget-arguments
257 '("-q" "-O" "-")
258 "Arguments which are passed to wget.
259There is probably no reason to change the default settings, unless you
260are living behind a firewall."
261 :type '(repeat (string :tag "Argument"))
262 :group 'newsticker-retrieval)
263
264(defcustom newsticker-retrieval-interval
265 3600
266 "Time interval for retrieving new news items (seconds).
267If this value is not positive (i.e. less than or equal to 0)
268items are retrieved only once!
269Please note that some feeds, e.g. Slashdot, will ban you if you
270make it less than 1800 seconds (30 minutes)!"
271 :type '(choice :tag "Interval"
272 (const :tag "No automatic retrieval" 0)
273 (const :tag "Hourly" 3600)
274 (const :tag "Daily" 86400)
275 (const :tag "Weekly" 604800)
276 (integer :tag "Interval"))
277 :set 'newsticker--set-customvar-retrieval
278 :group 'newsticker-retrieval)
279
280(defcustom newsticker-desc-comp-max
281 100
282 "Relevant length of headline descriptions.
283This value gives the maximum number of characters which will be
284taken into account when newsticker compares two headline
285descriptions."
286 :type 'integer
287 :group 'newsticker-retrieval)
288
289;; ======================================================================
290;; headline processing
291(defgroup newsticker-headline-processing nil
292 "Settings for the automatic processing of headlines."
293 :group 'newsticker)
294
295(defcustom newsticker-automatically-mark-items-as-old
296 t
297 "Decides whether to automatically mark items as old.
298If t a new item is considered as new only after its first retrieval. As
299soon as it is retrieved a second time, it becomes old. If not t all
300items stay new until you mark them as old. This is done in the
301*newsticker* buffer."
302 :type 'boolean
303 :group 'newsticker-headline-processing)
304
305(defcustom newsticker-automatically-mark-visited-items-as-old
306 t
307 "Decides whether to automatically mark visited items as old.
308If t an item is marked as old as soon as the associated link is
309visited, i.e. after pressing RET or mouse2 on the item's
310headline."
311
312 :type 'boolean
313 :group 'newsticker-headline-processing)
314
315(defcustom newsticker-keep-obsolete-items
316 t
317 "Decides whether to keep unread items which have been removed from feed.
318If t a new item, which has been removed from the feed, is kept in
319the cache until it is marked as read."
320 :type 'boolean
321 :group 'newsticker-headline-processing)
322
323(defcustom newsticker-obsolete-item-max-age
324 (* 60 60 24)
325 "Maximal age of obsolete items, in seconds.
326Obsolete items which are older than this value will be silently
327deleted at the next retrieval."
328 :type 'integer
329 :group 'newsticker-headline-processing)
330
331(defcustom newsticker-auto-mark-filter-list
332 nil
333 "A list of filters for automatically marking headlines.
334
335This is an alist of the form (FEED-NAME PATTERN-LIST). I.e. each
336element consists of a FEED-NAME a PATTERN-LIST. Each element of
337the pattern-list has the form (AGE TITLE-OR-DESCRIPTION REGEXP).
338AGE must be one of the symbols 'old or 'immortal.
339TITLE-OR-DESCRIPTION must be on of the symbols 'title,
340'description, or 'all. REGEXP is a regular expression, i.e. a
341string.
342
343This filter is checked after a new headline has been retrieved.
344If FEED-NAME matches the name of the corresponding news feed, the
345pattern-list is checked: The new headline will be marked as AGE
346if REGEXP matches the headline's TITLE-OR-DESCRIPTION.
347
348If, for example, `newsticker-auto-mark-filter-list' looks like
349 \((slashdot ('old 'title \"^Forget me!$\") ('immortal 'title \"Read me\")
350 \('immortal 'all \"important\"))))
351
352then all articles from slashdot are marked as old if they have
353the title \"Forget me!\". All articles with a title containing
354the string \"Read me\" are marked as immortal. All articles which
355contain the string \"important\" in their title or their
356description are marked as immortal."
357 :type '(repeat (list :tag "Auto mark filter"
358 (string :tag "Feed name")
359 (repeat
360 (list :tag "Filter element"
361 (choice
362 :tag "Auto-assigned age"
363 (const :tag "Old" old)
364 (const :tag "Immortal" immortal))
365 (choice
366 :tag "Title/Description"
367 (const :tag "Title" title)
368 (const :tag "Description" description)
369 (const :tag "All" all))
370 (string :tag "Regexp")))))
371 :group 'newsticker-headline-processing)
372
373;; ======================================================================
374;; hooks
375(defgroup newsticker-hooks nil
376 "Settings for newsticker hooks."
377 :group 'newsticker)
378
379(defcustom newsticker-start-hook
380 nil
381 "Hook run when starting newsticker.
382This hook is run at the very end of `newsticker-start'."
383 :options '(newsticker-start-ticker)
384 :type 'hook
385 :group 'newsticker-hooks)
386
387(defcustom newsticker-stop-hook
388 nil
389 "Hook run when stopping newsticker.
390This hook is run at the very end of `newsticker-stop'."
391 :options nil
392 :type 'hook
393 :group 'newsticker-hooks)
394
395(defcustom newsticker-new-item-functions
396 nil
397 "List of functions run after a new headline has been retrieved.
398Each function is called with the following three arguments:
399FEED the name of the corresponding news feed,
400TITLE the title of the headline,
401DESC the decoded description of the headline.
402
403See `newsticker-download-images', and
404`newsticker-download-enclosures' for sample functions.
405
406Please note that these functions are called only once for a
407headline after it has been retrieved for the first time."
408 :type 'hook
409 :options '(newsticker-download-images
410 newsticker-download-enclosures)
411 :group 'newsticker-hooks)
412
413;; ======================================================================
414;; miscellaneous
415(defgroup newsticker-miscellaneous nil
416 "Miscellaneous newsticker settings."
417 :group 'newsticker)
418
419(defcustom newsticker-cache-filename
420 "~/.newsticker-cache"
421 "Name of the newsticker cache file."
422 :type 'string
423 :group 'newsticker-miscellaneous)
5443c9b7 424(make-obsolete 'newsticker-cache-filename 'newsticker-dir "23.1")
2415d4c6 425
a59c6c51 426(defcustom newsticker-dir
77a01f9b
UJ		 427 (locate-user-emacs-file "newsticker/" ".newsticker/")
428 "Directory where newsticker saves data."
429 :type 'directory
2415d4c6
UJ		 430 :group 'newsticker-miscellaneous)
431
432;; debugging
433(defcustom newsticker-debug
434 nil
435 "Enables some features needed for debugging newsticker.el.
436
437If set to t newsticker.el will print lots of debugging messages, and the
438buffers *newsticker-wget-<feed>* will not be closed."
439 :type 'boolean
440 :group 'newsticker-miscellaneous)
441
442;; ======================================================================
443;;; Compatibility section, XEmacs, Emacs
444;; ======================================================================
ed4ba8df
GM		 445
446;; FIXME It is bad practice to define compat functions with such generic names.
447
448;; This is not needed in Emacs >= 22.1.
2415d4c6
UJ		 449(unless (fboundp 'time-add)
450 (require 'time-date);;FIXME
451 (defun time-add (t1 t2)
ed4ba8df
GM		 452 (with-no-warnings ; don't warn about obsolete time-to-seconds in 23.2
453 (seconds-to-time (+ (time-to-seconds t1) (time-to-seconds t2))))))
2415d4c6
UJ		 454
455(unless (fboundp 'match-string-no-properties)
456 (defalias 'match-string-no-properties 'match-string))
457
458(when (featurep 'xemacs)
459 (unless (fboundp 'replace-regexp-in-string)
460 (defun replace-regexp-in-string (re rp st)
461 (save-match-data ;; apparently XEmacs needs save-match-data
462 (replace-in-string st re rp)))))
463
464;; copied from subr.el
465(unless (fboundp 'add-to-invisibility-spec)
466 (defun add-to-invisibility-spec (arg)
467 "Add elements to `buffer-invisibility-spec'.
468See documentation for `buffer-invisibility-spec' for the kind of elements
469that can be added."
470 (if (eq buffer-invisibility-spec t)
471 (setq buffer-invisibility-spec (list t)))
472 (setq buffer-invisibility-spec
473 (cons arg buffer-invisibility-spec))))
474
475;; copied from subr.el
476(unless (fboundp 'remove-from-invisibility-spec)
477 (defun remove-from-invisibility-spec (arg)
478 "Remove elements from `buffer-invisibility-spec'."
479 (if (consp buffer-invisibility-spec)
480 (setq buffer-invisibility-spec
481 (delete arg buffer-invisibility-spec)))))
482
483;; ======================================================================
484;;; Internal variables
485;; ======================================================================
486(defvar newsticker--item-list nil
487 "List of newsticker items.")
488(defvar newsticker--item-position 0
489 "Actual position in list of newsticker items.")
490(defvar newsticker--prev-message "There was no previous message yet!"
491 "Last message that the newsticker displayed.")
492(defvar newsticker--scrollable-text ""
493 "The text which is scrolled smoothly in the echo area.")
494(defvar newsticker--buffer-uptodate-p nil
495 "Tells whether the newsticker buffer is up to date.")
496(defvar newsticker--latest-update-time (current-time)
497 "The time at which the latest news arrived.")
498(defvar newsticker--process-ids nil
499 "List of PIDs of active newsticker processes.")
500
501(defvar newsticker--cache nil "Cached newsticker data.
502This is a list of the form
503
504 ((label1
505 (title description link time age index preformatted-contents
506 preformatted-title extra-elements)
507 ...)
508 (label2
509 (title description link time age index preformatted-contents
510 preformatted-title extra-elements)
511 ...)
512 ...)
513
514where LABEL is a symbol. TITLE, DESCRIPTION, and LINK are
515strings. TIME is a time value as returned by `current-time'.
516AGE is a symbol: 'new, 'old, 'immortal, and 'obsolete denote
517ordinary news items, whereas 'feed denotes an item which is not a
518headline but describes the feed itself. INDEX denotes the
519original position of the item -- used for restoring the original
520order. PREFORMATTED-CONTENTS and PREFORMATTED-TITLE hold the
521formatted contents of the item's description and title. This
522speeds things up if HTML rendering is used, which is rather
523slow. EXTRA-ELEMENTS is an alist containing additional elements.")
524
525(defvar newsticker--auto-narrow-to-feed nil
526 "Automatically narrow to current news feed.
527If non-nil only the items of the current news feed are visible.")
528
529(defvar newsticker--auto-narrow-to-item nil
530 "Automatically narrow to current news item.
531If non-nil only the current headline is visible.")
532
533(defconst newsticker--error-headline
534 "[COULD NOT DOWNLOAD HEADLINES!]"
535 "Title of error headline which will be inserted if news retrieval fails.")
536
537;; ======================================================================
538;;; Shortcuts
539;; ======================================================================
540(defsubst newsticker--title (item)
541 "Return title of ITEM."
542 (nth 0 item))
543(defsubst newsticker--desc (item)
544 "Return description of ITEM."
545 (nth 1 item))
546(defsubst newsticker--link (item)
547 "Return link of ITEM."
548 (nth 2 item))
549(defsubst newsticker--time (item)
550 "Return time of ITEM."
551 (nth 3 item))
552(defsubst newsticker--age (item)
553 "Return age of ITEM."
554 (nth 4 item))
555(defsubst newsticker--pos (item)
556 "Return position/index of ITEM."
557 (nth 5 item))
558(defsubst newsticker--preformatted-contents (item)
559 "Return pre-formatted text of ITEM."
560 (nth 6 item))
561(defsubst newsticker--preformatted-title (item)
562 "Return pre-formatted title of ITEM."
563 (nth 7 item))
564(defsubst newsticker--extra (item)
565 "Return extra attributes of ITEM."
566 (nth 8 item))
567(defsubst newsticker--guid-to-string (guid)
568 "Return string representation of GUID."
569 (if (stringp guid)
570 guid
571 (car (xml-node-children guid))))
572(defsubst newsticker--guid (item)
573 "Return guid of ITEM."
574 (newsticker--guid-to-string (assoc 'guid (newsticker--extra item))))
575(defsubst newsticker--enclosure (item)
576 "Return enclosure element of ITEM in the form \(...FIXME...\) or nil."
577 (let ((enclosure (assoc 'enclosure (newsticker--extra item))))
578 (if enclosure
579 (xml-node-attributes enclosure))))
580(defun newsticker--real-feed-name (feed)
581 "Return real name of FEED."
582 (catch 'name
583 (mapc (lambda (item)
584 (if (eq (newsticker--age item) 'feed)
585 (throw 'name (newsticker--title item))))
586 (cdr (newsticker--cache-get-feed feed)))
587 (symbol-name feed)))
588
589
590;; ======================================================================
591;;; User fun
592;; ======================================================================
593
594(defun newsticker--start-feed (feed &optional do-not-complain-if-running)
595 "Start retrieval timer for FEED.
596If timer is running already a warning message is printed unless
597DO-NOT-COMPLAIN-IF-RUNNING is not nil. Add the started
598name/timer pair to `newsticker--retrieval-timer-list'."
599 (let* ((feed-name (car feed))
600 (start-time (nth 2 feed))
601 (interval (or (nth 3 feed)
602 newsticker-retrieval-interval))
603 (timer (assoc (car feed)
604 newsticker--retrieval-timer-list)))
605 (if timer
606 (or do-not-complain-if-running
607 (message "Timer for %s is running already!"
608 feed-name))
609 (newsticker--debug-msg "Starting timer for %s: %s, %d"
610 feed-name start-time interval)
611 ;; do not repeat retrieval if interval not positive
612 (if (<= interval 0)
613 (setq interval nil))
614 ;; Suddenly XEmacs doesn't like start-time 0
615 (if (or (not start-time)
616 (and (numberp start-time) (= start-time 0)))
617 (setq start-time 1))
618 ;; (message "start-time %s" start-time)
619 (setq timer (run-at-time start-time interval
620 'newsticker-get-news feed-name))
621 (if interval
622 (add-to-list 'newsticker--retrieval-timer-list
623 (cons feed-name timer))))))
624
625;;;###autoload
626(defun newsticker-start (&optional do-not-complain-if-running)
627 "Start the newsticker.
628Start the timers for display and retrieval. If the newsticker, i.e. the
629timers, are running already a warning message is printed unless
630DO-NOT-COMPLAIN-IF-RUNNING is not nil.
631Run `newsticker-start-hook' if newsticker was not running already."
632 (interactive)
633 (let ((running (newsticker-running-p)))
634 ;; read old cache if it exists and newsticker is not running
635 (unless running
a59c6c51 636 (newsticker--cache-read))
2415d4c6
UJ		 637 ;; start retrieval timers -- one timer for each feed
638 (dolist (feed (append newsticker-url-list-defaults newsticker-url-list))
639 (newsticker--start-feed feed))
640 (unless running
641 (run-hooks 'newsticker-start-hook)
642 (message "Newsticker started!"))))
643
644(defun newsticker--stop-feed (feed-name)
645 "Stop retrieval for feed FEED-NAME.
646Delete the stopped name/timer pair from `newsticker--retrieval-timer-list'."
647 (let ((name-and-timer (assoc feed-name newsticker--retrieval-timer-list)))
648 (when name-and-timer
649 (cancel-timer (cdr name-and-timer))
650 (setq newsticker--retrieval-timer-list
651 (delete name-and-timer newsticker--retrieval-timer-list)))))
652
653(defun newsticker-stop ()
654 "Stop the newsticker and the newsticker-ticker.
655Cancel the timers for display and retrieval. Run `newsticker-stop-hook'
656if newsticker has been running."
657 (interactive)
a59c6c51 658 (newsticker--cache-save)
2415d4c6
UJ		 659 (when (fboundp 'newsticker-stop-ticker) ; silence compiler warnings
660 (newsticker-stop-ticker))
661 (when (newsticker-running-p)
662 (mapc (lambda (name-and-timer)
663 (newsticker--stop-feed (car name-and-timer)))
664 newsticker--retrieval-timer-list)
665 (setq newsticker--retrieval-timer-list nil)
666 (run-hooks 'newsticker-stop-hook)
667 (message "Newsticker stopped!")))
668
669(defun newsticker-get-all-news ()
670 "Launch retrieval of news from all configured newsticker sites.
671This does NOT start the retrieval timers."
672 (interactive)
673 ;; launch retrieval of news
674 (mapc (lambda (item)
675 (newsticker-get-news (car item)))
676 (append newsticker-url-list-defaults newsticker-url-list)))
677
678(defun newsticker-save-item (feed item)
679 "Save FEED ITEM."
680 (interactive)
681 (let ((filename (read-string "Filename: "
682 (concat feed ":_"
683 (replace-regexp-in-string
684 " " "_" (newsticker--title item))
685 ".html"))))
686 (with-temp-buffer
687 (insert (newsticker--desc item))
688 (write-file filename t))))
689
690(defun newsticker-add-url (url name)
691 "Add given URL under given NAME to `newsticker-url-list'.
692If URL is nil it is searched at point."
693 (interactive
694 (list
695 (read-string "URL: "
696 (save-excursion
697 (end-of-line)
698 (and
699 (re-search-backward
700 "http://"
701 (if (> (point) (+ (point-min) 100))
702 (- (point) 100)
703 (point-min))
704 t)
705 (re-search-forward
706 "http://[-a-zA-Z0-9&/_.]*"
707 (if (< (point) (- (point-max) 200))
708 (+ (point) 200)
709 (point-max))
710 t)
711 (buffer-substring-no-properties (match-beginning 0)
712 (match-end 0)))))
713 (read-string "Name: ")))
714 (add-to-list 'newsticker-url-list (list name url nil nil nil) t)
715 (customize-variable 'newsticker-url-list))
716
717(defun newsticker-customize ()
718 "Open the newsticker customization group."
719 (interactive)
0c74a301 720 (delete-other-windows)
2415d4c6
UJ		 721 (customize-group "newsticker"))
722
723;; ======================================================================
724;;; Local stuff
725;; ======================================================================
726(defun newsticker--get-news-by-funcall (feed-name function)
727 "Get news for the site FEED-NAME by calling FUNCTION.
728See `newsticker-get-news'."
729 (let ((buffername (concat " *newsticker-funcall-" feed-name "*")))
9a529312 730 (with-current-buffer (get-buffer-create buffername)
2415d4c6
UJ		 731 (erase-buffer)
732 (insert (string-to-multibyte (funcall function feed-name)))
733 (newsticker--sentinel-work nil t feed-name function
734 (current-buffer)))))
735
736(defun newsticker--get-news-by-url (feed-name url)
737 "Get news for the site FEED-NAME from address URL using `url-retrieve'.
738See `newsticker-get-news'."
739 (let ((coding-system-for-read 'no-conversion))
79a3bdcd 740 (condition-case error-data
a59c6c51 741 (url-retrieve url 'newsticker--get-news-by-url-callback
79a3bdcd
UJ		 742 (list feed-name))
743 (error (message "Error retrieving news from %s: %s" feed-name
744 error-data))))
2415d4c6
UJ		 745 (force-mode-line-update))
746
747(defun newsticker--get-news-by-url-callback (status feed-name)
748 "Callback function for `newsticker--get-news-by-url'.
749STATUS is the return status as delivered by `url-retrieve', and
750FEED-NAME is the name of the feed that the news were retrieved
751from."
752 (let ((buf (get-buffer-create (concat " *newsticker-url-" feed-name "*")))
753 (result (string-to-multibyte (buffer-string))))
754 (set-buffer buf)
755 (erase-buffer)
756 (insert result)
757 ;; remove MIME header
758 (goto-char (point-min))
759 (search-forward "\n\n")
760 (delete-region (point-min) (point))
761 ;; read the rss/atom contents
762 (newsticker--sentinel-work nil t feed-name "url-retrieve" (current-buffer))
763 (when status
764 (let ((status-type (car status))
765 (status-details (cdr status)))
766 (cond ((eq status-type :redirect)
767 ;; don't care about redirects
768 )
769 ((eq status-type :error)
770 (message "%s: Error while retrieving news from %s: %s: \"%s\""
771 (format-time-string "%A, %H:%M" (current-time))
772 feed-name
773 (car status-details) (cdr status-details))))))))
774
775(defun newsticker--get-news-by-wget (feed-name url wget-arguments)
776 "Get news for the site FEED-NAME from address URL using wget.
777WGET-ARGUMENTS is a list of arguments for wget.
778See `newsticker-get-news'."
779 (let ((buffername (concat " *newsticker-wget-" feed-name "*")))
9a529312 780 (with-current-buffer (get-buffer-create buffername)
2415d4c6
UJ		 781 (erase-buffer)
782 ;; throw an error if there is an old wget-process around
783 (if (get-process feed-name)
784 (error "Another wget-process is running for %s" feed-name))
785 ;; start wget
786 (let* ((args (append wget-arguments (list url)))
787 (proc (apply 'start-process feed-name buffername
788 newsticker-wget-name args)))
789 (set-process-coding-system proc 'no-conversion 'no-conversion)
790 (set-process-sentinel proc 'newsticker--sentinel)
791 (setq newsticker--process-ids (cons (process-id proc)
792 newsticker--process-ids))
793 (force-mode-line-update)))))
794
795(defun newsticker-get-news (feed-name)
796 "Get news from the site FEED-NAME and load feed logo.
797FEED-NAME must be a string which occurs as the label (i.e. the first element)
798in an element of `newsticker-url-list' or `newsticker-url-list-defaults'."
799 (newsticker--debug-msg "%s: Getting news for %s"
800 (format-time-string "%A, %H:%M" (current-time))
801 feed-name)
802 (let* ((item (or (assoc feed-name newsticker-url-list)
803 (assoc feed-name newsticker-url-list-defaults)
804 (error
805 "Cannot get news for %s: Check newsticker-url-list"
806 feed-name)))
807 (url (cadr item))
808 (wget-arguments (or (car (cdr (cdr (cdr (cdr item)))))
809 newsticker-wget-arguments)))
810 (if (functionp url)
811 (newsticker--get-news-by-funcall feed-name url)
812 (if (eq newsticker-retrieval-method 'intern)
813 (newsticker--get-news-by-url feed-name url)
814 (newsticker--get-news-by-wget feed-name url wget-arguments)))))
815
816;; ======================================================================
817;; Parsing
818;; ======================================================================
819
820(defun newsticker--sentinel (process event)
821 "Sentinel for extracting news titles from an RDF buffer.
822Argument PROCESS is the process which has just changed its state.
823Argument EVENT tells what has happened to the process."
824 (let ((p-status (process-status process))
825 (exit-status (process-exit-status process))
826 (name (process-name process))
827 (command (process-command process))
828 (buffer (process-buffer process)))
829 (newsticker--sentinel-work event
830 (and (eq p-status 'exit)
831 (= exit-status 0))
832 name command buffer)))
833
834(defun newsticker--sentinel-work (event status-ok name command buffer)
835 "Actually do the sentinel work.
836Argument EVENT tells what has happened to the retrieval process.
837Argument STATUS-OK is the final status of the retrieval process,
838non-nil meaning retrieval was successful.
839Argument NAME is the name of the retrieval process.
840Argument COMMAND is the command of the retrieval process.
841Argument BUFFER is the buffer of the retrieval process."
842 (let ((time (current-time))
843 (name-symbol (intern name))
844 (something-was-added nil))
845 ;; catch known errors (zombie processes, rubbish-xml etc.
846 ;; if an error occurs the news feed is not updated!
847 (catch 'oops
848 (unless status-ok
849 (setq newsticker--cache
850 (newsticker--cache-add
851 newsticker--cache
852 name-symbol
853 newsticker--error-headline
854 (format
855 (concat "%s: Newsticker could not retrieve news from %s.\n"
856 "Return status: `%s'\n"
857 "Command was `%s'")
858 (format-time-string "%A, %H:%M" (current-time))
859 name event command)
860 ""
861 (current-time)
862 'new
863 0 nil))
864 (message "%s: Error while retrieving news from %s"
865 (format-time-string "%A, %H:%M" (current-time))
866 name)
867 (throw 'oops nil))
868 (let* ((coding-system 'utf-8)
869 (node-list
870 (save-current-buffer
871 (set-buffer buffer)
872 ;; a very very dirty workaround to overcome the
873 ;; problems with the newest (20030621) xml.el:
874 ;; remove all unnecessary whitespace
875 (goto-char (point-min))
876 (while (re-search-forward ">[ \t\r\n]+<" nil t)
877 (replace-match "><" nil t))
878 ;; and another brutal workaround (20031105)! For some
879 ;; reason the xml parser does not like the colon in the
880 ;; doctype name "rdf:RDF"
881 (goto-char (point-min))
882 (if (re-search-forward "<!DOCTYPE[ \t\n]+rdf:RDF" nil t)
883 (replace-match "<!DOCTYPE rdfColonRDF" nil t))
884 ;; finally.... ~##^°!!!!!
885 (goto-char (point-min))
886 (while (search-forward "\r\n" nil t)
887 (replace-match "\n" nil t))
888 ;; still more brutal workarounds (20040309)! The xml
889 ;; parser does not like doctype rss
890 (goto-char (point-min))
891 (if (re-search-forward "<!DOCTYPE[ \t\n]+rss[ \t\n]*>" nil t)
892 (replace-match "" nil t))
893 ;; And another one (20050618)! (Fixed in GNU Emacs 22.0.50.18)
894 ;; Remove comments to avoid this xml-parsing bug:
895 ;; "XML files can have only one toplevel tag"
896 (goto-char (point-min))
897 (while (search-forward "<!--" nil t)
898 (let ((start (match-beginning 0)))
899 (unless (search-forward "-->" nil t)
900 (error "Can't find end of comment"))
901 (delete-region start (point))))
902 ;; And another one (20050702)! If description is HTML
903 ;; encoded and starts with a `<', wrap the whole
904 ;; description in a CDATA expression. This happened for
905 ;; http://www.thefreedictionary.com/_/WoD/rss.aspx?type=quote
906 (goto-char (point-min))
907 (while (re-search-forward
908 "<description>\\(<img.*?\\)</description>" nil t)
909 (replace-match
910 "<description><![CDATA[ \\1 ]]></description>"))
911 ;; And another one (20051123)! XML parser does not
912 ;; like this: <yweather:location city="Frankfurt/Main"
913 ;; region="" country="GM" />
914 ;; try to "fix" empty attributes
915 ;; This happened for
916 ;; http://xml.weather.yahoo.com/forecastrss?p=GMXX0040&u=f
917 (goto-char (point-min))
918 (while (re-search-forward "\\(<[^>]*\\)=\"\"" nil t)
919 (replace-match "\\1=\" \""))
920 ;;
921 (set-buffer-modified-p nil)
922 ;; check coding system
923 (goto-char (point-min))
924 (if (re-search-forward "encoding=\"\\([^\"]+\\)\""
925 nil t)
926 (setq coding-system (intern (downcase (match-string 1))))
927 (setq coding-system
928 (condition-case nil
929 (check-coding-system coding-system)
930 (coding-system-error
931 (message
932 "newsticker.el: ignoring coding system %s for %s"
933 coding-system name)
934 nil))))
935 ;; Decode if possible
936 (when coding-system
937 (decode-coding-region (point-min) (point-max)
938 coding-system))
939 (condition-case errordata
940 ;; The xml parser might fail
941 ;; or the xml might be bugged
942 (xml-parse-region (point-min) (point-max))
943 (error (message "Could not parse %s: %s"
944 (buffer-name) (cadr errordata))
945 (throw 'oops nil)))))
946 (topnode (car node-list))
947 (channelnode (car (xml-get-children topnode 'channel)))
948 (imageurl nil))
949 ;; mark all items as obsolete
950 (newsticker--cache-replace-age newsticker--cache
951 name-symbol
952 'new 'obsolete-new)
953 (newsticker--cache-replace-age newsticker--cache
954 name-symbol
955 'old 'obsolete-old)
956 (newsticker--cache-replace-age newsticker--cache
957 name-symbol
958 'feed 'obsolete-old)
959
960 ;; check Atom/RSS version and call corresponding parser
961 (condition-case error-data
962 (if (cond
963 ;; RSS 0.91
964 ((and (eq 'rss (xml-node-name topnode))
965 (string= "0.91" (xml-get-attribute topnode 'version)))
966 (setq imageurl (newsticker--get-logo-url-rss-0.91 topnode))
967 (newsticker--parse-rss-0.91 name time topnode))
968 ;; RSS 0.92
969 ((and (eq 'rss (xml-node-name topnode))
970 (string= "0.92" (xml-get-attribute topnode 'version)))
971 (setq imageurl (newsticker--get-logo-url-rss-0.92 topnode))
972 (newsticker--parse-rss-0.92 name time topnode))
973 ;; RSS 1.0
974 ((eq 'rdf:RDF (xml-node-name topnode))
975 (setq imageurl (newsticker--get-logo-url-rss-1.0 topnode))
976 (newsticker--parse-rss-1.0 name time topnode))
977 ;; RSS 2.0
978 ((and (eq 'rss (xml-node-name topnode))
979 (string= "2.0" (xml-get-attribute topnode 'version)))
980 (setq imageurl (newsticker--get-logo-url-rss-2.0 topnode))
981 (newsticker--parse-rss-2.0 name time topnode))
982 ;; Atom 0.3
983 ((and (eq 'feed (xml-node-name topnode))
984 (string= "http://purl.org/atom/ns#"
985 (xml-get-attribute topnode 'xmlns)))
986 (setq imageurl (newsticker--get-logo-url-atom-0.3 topnode))
987 (newsticker--parse-atom-0.3 name time topnode))
988 ;; Atom 1.0
989 ((and (eq 'feed (xml-node-name topnode))
990 (string= "http://www.w3.org/2005/Atom"
991 (xml-get-attribute topnode 'xmlns)))
992 (setq imageurl (newsticker--get-logo-url-atom-1.0 topnode))
993 (newsticker--parse-atom-1.0 name time topnode))
994 ;; unknown feed type
995 (t
996 (newsticker--debug-msg "Feed type unknown: %s: %s"
997 (xml-node-name topnode) name)
998 nil))
999 (setq something-was-added t))
79a3bdcd 1000 (error (message "sentinelerror in %s: %s" name error-data)))
2415d4c6
UJ		 1001
1002 ;; Remove those old items from cache which have been removed from
1003 ;; the feed
1004 (newsticker--cache-replace-age newsticker--cache
1005 name-symbol 'obsolete-old 'deleteme)
1006 (newsticker--cache-remove newsticker--cache name-symbol
1007 'deleteme)
1008 ;; Remove those new items from cache which have been removed from
1009 ;; the feed. Or keep them as `obsolete'
1010 (if (not newsticker-keep-obsolete-items)
1011 (newsticker--cache-remove newsticker--cache
1012 name-symbol 'obsolete-new)
1013 (setq newsticker--cache
1014 (newsticker--cache-mark-expired
1015 newsticker--cache name-symbol 'obsolete 'obsolete-expired
1016 newsticker-obsolete-item-max-age))
1017 (newsticker--cache-remove newsticker--cache
1018 name-symbol 'obsolete-expired)
1019 (newsticker--cache-replace-age newsticker--cache
1020 name-symbol 'obsolete-new
1021 'obsolete))
1022 (newsticker--update-process-ids)
1023 ;; setup scrollable text
1024 (when (= 0 (length newsticker--process-ids))
1025 (when (fboundp 'newsticker--ticker-text-setup) ;silence
1026 ;compiler
1027 ;warnings
1028 (newsticker--ticker-text-setup)))
1029 (setq newsticker--latest-update-time (current-time))
1030 (when something-was-added
1031 ;; FIXME: should we care about removed items as well?
a59c6c51
UJ		 1032 (newsticker--cache-save-feed
1033 (newsticker--cache-get-feed name-symbol))
2415d4c6
UJ		 1034 (when (fboundp 'newsticker--buffer-set-uptodate) ;silence
1035 ;compiler
1036 ;warnings
1037 (newsticker--buffer-set-uptodate nil)))
1038 ;; kill the process buffer if wanted
1039 (unless newsticker-debug
1040 (kill-buffer buffer))
1041 ;; launch retrieval of image
1042 (when (and imageurl newsticker--download-logos)
1043 (newsticker--image-get name imageurl)))))
1044 (when newsticker--sentinel-callback
1045 (funcall newsticker--sentinel-callback)))
1046
1047(defun newsticker--get-logo-url-atom-1.0 (node)
1048 "Return logo URL from atom 1.0 data in NODE."
1049 (car (xml-node-children
1050 (car (xml-get-children node 'logo)))))
1051
1052(defun newsticker--get-logo-url-atom-0.3 (node)
1053 "Return logo URL from atom 0.3 data in NODE."
1054 (car (xml-node-children
1055 (car (xml-get-children (car (xml-get-children node 'image)) 'url)))))
1056
1057(defun newsticker--get-logo-url-rss-2.0 (node)
1058 "Return logo URL from RSS 2.0 data in NODE."
1059 (car (xml-node-children
1060 (car (xml-get-children
1061 (car (xml-get-children
1062 (car (xml-get-children node 'channel)) 'image)) 'url)))))
1063
1064(defun newsticker--get-logo-url-rss-1.0 (node)
1065 "Return logo URL from RSS 1.0 data in NODE."
1066 (car (xml-node-children
1067 (car (xml-get-children (car (xml-get-children node 'image)) 'url)))))
1068
1069(defun newsticker--get-logo-url-rss-0.92 (node)
1070 "Return logo URL from RSS 0.92 data in NODE."
1071 (car (xml-node-children
1072 (car (xml-get-children (car (xml-get-children node 'image)) 'url)))))
1073
1074(defun newsticker--get-logo-url-rss-0.91 (node)
1075 "Return logo URL from RSS 0.91 data in NODE."
1076 (car (xml-node-children
1077 (car (xml-get-children (car (xml-get-children node 'image)) 'url)))))
1078
1079(defun newsticker--parse-atom-0.3 (name time topnode)
1080 "Parse Atom 0.3 data.
1081Return value as well as arguments NAME, TIME, and TOPNODE are the
1082same as in `newsticker--parse-atom-1.0'."
1083 (newsticker--debug-msg "Parsing Atom 0.3 feed %s" name)
1084 (let (new-feed new-item)
1085 (setq new-feed (newsticker--parse-generic-feed
1086 name time
1087 ;; title
1088 (car (xml-node-children
1089 (car (xml-get-children topnode 'title))))
1090 ;; desc
1091 (car (xml-node-children
1092 (car (xml-get-children topnode 'content))))
1093 ;; link
1094 (xml-get-attribute
1095 (car (xml-get-children topnode 'link)) 'href)
1096 ;; extra-elements
1097 (xml-node-children topnode)))
1098 (setq new-item (newsticker--parse-generic-items
1099 name time (xml-get-children topnode 'entry)
1100 ;; title-fn
1101 (lambda (node)
1102 (car (xml-node-children
1103 (car (xml-get-children node 'title)))))
1104 ;; desc-fn
1105 (lambda (node)
1106 (or (car (xml-node-children
1107 (car (xml-get-children node 'content))))
1108 (car (xml-node-children
1109 (car (xml-get-children node 'summary))))))
1110 ;; link-fn
1111 (lambda (node)
1112 (xml-get-attribute
1113 (car (xml-get-children node 'link)) 'href))
1114 ;; time-fn
1115 (lambda (node)
1116 (newsticker--decode-rfc822-date
1117 (car (xml-node-children
1118 (car (xml-get-children node 'modified))))))
1119 ;; guid-fn
1120 (lambda (node)
1121 (newsticker--guid-to-string
1122 (assoc 'guid (xml-node-children node))))
1123 ;; extra-fn
1124 (lambda (node)
1125 (xml-node-children node))))
1126 (or new-item new-feed)))
1127
1128(defun newsticker--parse-atom-1.0 (name time topnode)
1129 "Parse Atom 1.0 data.
1130Argument NAME gives the name of a news feed. TIME gives the
1131system time at which the data have been retrieved. TOPNODE
1132contains the feed data as returned by the xml parser.
1133
1134For the Atom 1.0 specification see
855b42a2 1135URL `http://www.atompub.org/2005/08/17/draft-ietf-atompub-format-11.html'"
2415d4c6
UJ		 1136 (newsticker--debug-msg "Parsing Atom 1.0 feed %s" name)
1137 (let (new-feed new-item)
1138 (setq new-feed (newsticker--parse-generic-feed
1139 name time
1140 ;; title
1141 (car (xml-node-children
1142 (car (xml-get-children topnode 'title))))
1143 ;; desc
1144 (car (xml-node-children
1145 (car (xml-get-children topnode 'subtitle))))
1146 ;; link
1147 (lambda (node)
1148 (xml-get-attribute
1149 (car (xml-get-children node 'link)) 'href))
1150 ;; extra-elements
1151 (xml-node-children topnode)))
1152 (setq new-item (newsticker--parse-generic-items
1153 name time (xml-get-children topnode 'entry)
1154 ;; title-fn
1155 (lambda (node)
1156 (car (xml-node-children
1157 (car (xml-get-children node 'title)))))
1158 ;; desc-fn
1159 (lambda (node)
1160 (or (car (xml-node-children
1161 (car (xml-get-children node 'content))))
1162 (car (xml-node-children
1163 (car (xml-get-children node 'summary))))))
1164 ;; link-fn
1165 (lambda (node)
1166 (xml-get-attribute
1167 (car (xml-get-children node 'link)) 'href))
1168 ;; time-fn
1169 (lambda (node)
1170 (newsticker--decode-iso8601-date
1171 (or (car (xml-node-children
1172 (car (xml-get-children node 'updated))))
1173 (car (xml-node-children
1174 (car (xml-get-children node 'published)))))))
1175 ;; guid-fn
1176 (lambda (node)
1177 (car (xml-node-children
1178 (car (xml-get-children node 'id)))))
1179 ;; extra-fn
1180 (lambda (node)
1181 (xml-node-children node))))
1182 (or new-item new-feed)))
1183
1184(defun newsticker--parse-rss-0.91 (name time topnode)
1185 "Parse RSS 0.91 data.
1186Return value as well as arguments NAME, TIME, and TOPNODE are the
1187same as in `newsticker--parse-atom-1.0'.
1188
855b42a2
GM		 1189For the RSS 0.91 specification see URL `http://backend.userland.com/rss091'
1190or URL `http://my.netscape.com/publish/formats/rss-spec-0.91.html'."
2415d4c6
UJ		 1191 (newsticker--debug-msg "Parsing RSS 0.91 feed %s" name)
1192 (let* ((channelnode (car (xml-get-children topnode 'channel)))
1193 (pub-date (newsticker--decode-rfc822-date
1194 (car (xml-node-children
1195 (car (xml-get-children channelnode 'pubDate))))))
1196 is-new-feed has-new-items)
1197 (setq is-new-feed (newsticker--parse-generic-feed
1198 name time
1199 ;; title
1200 (car (xml-node-children
1201 (car (xml-get-children channelnode 'title))))
1202 ;; desc
1203 (car (xml-node-children
1204 (car (xml-get-children channelnode
1205 'description))))
1206 ;; link
1207 (car (xml-node-children
1208 (car (xml-get-children channelnode 'link))))
1209 ;; extra-elements
1210 (xml-node-children channelnode)))
1211 (setq has-new-items (newsticker--parse-generic-items
1212 name time (xml-get-children channelnode 'item)
1213 ;; title-fn
1214 (lambda (node)
1215 (car (xml-node-children
1216 (car (xml-get-children node 'title)))))
1217 ;; desc-fn
1218 (lambda (node)
1219 (car (xml-node-children
1220 (car (xml-get-children node 'description)))))
1221 ;; link-fn
1222 (lambda (node)
1223 (car (xml-node-children
1224 (car (xml-get-children node 'link)))))
1225 ;; time-fn
1226 (lambda (node)
1227 (newsticker--decode-rfc822-date
1228 (car (xml-node-children
1229 (car (xml-get-children node 'pubDate))))))
1230 ;; guid-fn
1231 (lambda (node)
1232 nil)
1233 ;; extra-fn
1234 (lambda (node)
1235 (xml-node-children node))))
1236 (or has-new-items is-new-feed)))
1237
1238(defun newsticker--parse-rss-0.92 (name time topnode)
1239 "Parse RSS 0.92 data.
1240Return value as well as arguments NAME, TIME, and TOPNODE are the
1241same as in `newsticker--parse-atom-1.0'.
1242
855b42a2 1243For the RSS 0.92 specification see URL `http://backend.userland.com/rss092'."
2415d4c6
UJ		 1244 (newsticker--debug-msg "Parsing RSS 0.92 feed %s" name)
1245 (let* ((channelnode (car (xml-get-children topnode 'channel)))
1246 (pub-date (newsticker--decode-rfc822-date
1247 (car (xml-node-children
1248 (car (xml-get-children channelnode 'pubDate))))))
1249 is-new-feed has-new-items)
1250 (setq is-new-feed (newsticker--parse-generic-feed
1251 name time
1252 ;; title
1253 (car (xml-node-children
1254 (car (xml-get-children channelnode 'title))))
1255 ;; desc
1256 (car (xml-node-children
1257 (car (xml-get-children channelnode
1258 'description))))
1259 ;; link
1260 (car (xml-node-children
1261 (car (xml-get-children channelnode 'link))))
1262 ;; extra-elements
1263 (xml-node-children channelnode)))
1264 (setq has-new-items (newsticker--parse-generic-items
1265 name time (xml-get-children channelnode 'item)
1266 ;; title-fn
1267 (lambda (node)
1268 (car (xml-node-children
1269 (car (xml-get-children node 'title)))))
1270 ;; desc-fn
1271 (lambda (node)
1272 (car (xml-node-children
1273 (car (xml-get-children node 'description)))))
1274 ;; link-fn
1275 (lambda (node)
1276 (car (xml-node-children
1277 (car (xml-get-children node 'link)))))
1278 ;; time-fn
1279 (lambda (node)
1280 (newsticker--decode-rfc822-date
1281 (car (xml-node-children
1282 (car (xml-get-children node 'pubDate))))))
1283 ;; guid-fn
1284 (lambda (node)
1285 nil)
1286 ;; extra-fn
1287 (lambda (node)
1288 (xml-node-children node))))
1289 (or has-new-items is-new-feed)))
1290
1291(defun newsticker--parse-rss-1.0 (name time topnode)
1292 "Parse RSS 1.0 data.
1293Return value as well as arguments NAME, TIME, and TOPNODE are the
1294same as in `newsticker--parse-atom-1.0'.
1295
855b42a2 1296For the RSS 1.0 specification see URL `http://web.resource.org/rss/1.0/spec'."
2415d4c6
UJ		 1297 (newsticker--debug-msg "Parsing RSS 1.0 feed %s" name)
1298 (let* ((channelnode (car (xml-get-children topnode 'channel)))
1299 is-new-feed has-new-items)
1300 (setq is-new-feed (newsticker--parse-generic-feed
1301 name time
1302 ;; title
1303 (car (xml-node-children
1304 (car (xml-get-children channelnode 'title))))
1305 ;; desc
1306 (car (xml-node-children
1307 (car (xml-get-children channelnode
1308 'description))))
1309 ;; link
1310 (car (xml-node-children
1311 (car (xml-get-children channelnode 'link))))
1312 ;; extra-elements
1313 (xml-node-children channelnode)))
1314 (setq has-new-items (newsticker--parse-generic-items
1315 name time (xml-get-children topnode 'item)
1316 ;; title-fn
1317 (lambda (node)
1318 (car (xml-node-children
1319 (car (xml-get-children node 'title)))))
1320 ;; desc-fn
1321 (lambda (node)
1322 (car (xml-node-children
1323 (car (xml-get-children node
1324 'description)))))
1325 ;; link-fn
1326 (lambda (node)
1327 (car (xml-node-children
1328 (car (xml-get-children node 'link)))))
1329 ;; time-fn
1330 (lambda (node)
1331 (newsticker--decode-iso8601-date
1332 (car (xml-node-children
1333 (car (xml-get-children node 'dc:date))))))
1334 ;; guid-fn
1335 (lambda (node)
1336 nil)
1337 ;; extra-fn
1338 (lambda (node)
1339 (xml-node-children node))))
1340 (or has-new-items is-new-feed)))
1341
1342(defun newsticker--parse-rss-2.0 (name time topnode)
1343 "Parse RSS 2.0 data.
1344Return value as well as arguments NAME, TIME, and TOPNODE are the
1345same as in `newsticker--parse-atom-1.0'.
1346
855b42a2 1347For the RSS 2.0 specification see URL `http://blogs.law.harvard.edu/tech/rss'."
2415d4c6
UJ		 1348 (newsticker--debug-msg "Parsing RSS 2.0 feed %s" name)
1349 (let* ((channelnode (car (xml-get-children topnode 'channel)))
1350 is-new-feed has-new-items)
1351 (setq is-new-feed (newsticker--parse-generic-feed
1352 name time
1353 ;; title
1354 (car (xml-node-children
1355 (car (xml-get-children channelnode 'title))))
1356 ;; desc
1357 (car (xml-node-children
1358 (car (xml-get-children channelnode
1359 'description))))
1360 ;; link
1361 (car (xml-node-children
1362 (car (xml-get-children channelnode 'link))))
1363 ;; extra-elements
1364 (xml-node-children channelnode)))
1365 (setq has-new-items (newsticker--parse-generic-items
1366 name time (xml-get-children channelnode 'item)
1367 ;; title-fn
1368 (lambda (node)
1369 (car (xml-node-children
1370 (car (xml-get-children node 'title)))))
1371 ;; desc-fn
1372 (lambda (node)
1373 (or (car (xml-node-children
1374 (car (xml-get-children node
1375 'content:encoded))))
1376 (car (xml-node-children
1377 (car (xml-get-children node
1378 'description))))))
1379 ;; link-fn
1380 (lambda (node)
1381 (car (xml-node-children
1382 (car (xml-get-children node 'link)))))
1383 ;; time-fn
1384 (lambda (node)
1385 (newsticker--decode-rfc822-date
1386 (car (xml-node-children
1387 (car (xml-get-children node 'pubDate))))))
1388 ;; guid-fn
1389 (lambda (node)
1390 (newsticker--guid-to-string
1391 (assoc 'guid (xml-node-children node))))
1392 ;; extra-fn
1393 (lambda (node)
1394 (xml-node-children node))))
1395 (or has-new-items is-new-feed)))
1396
1397(defun newsticker--parse-generic-feed (name time title desc link
1398 extra-elements)
1399 "Parse generic news feed data.
1400Argument NAME gives the name of a news feed. TIME gives the
1401system time at which the data have been retrieved.
1402
1403The arguments TITLE, DESC, LINK, and EXTRA-ELEMENTS give the feed's title,
1404description, link, and extra elements resp."
1405 (let ((title (or title "[untitled]"))
1406 (link (or link ""))
1407 (old-item nil)
1408 (position 0)
1409 (something-was-added nil))
1410 ;; decode numeric entities
571855b6
UJ		 1411 (setq title (xml-substitute-numeric-entities title))
1412 (setq desc (xml-substitute-numeric-entities desc))
1413 (setq link (xml-substitute-numeric-entities link))
2415d4c6
UJ		 1414 ;; remove whitespace from title, desc, and link
1415 (setq title (newsticker--remove-whitespace title))
1416 (setq desc (newsticker--remove-whitespace desc))
1417 (setq link (newsticker--remove-whitespace link))
1418
1419 ;; handle the feed itself
1420 (unless (newsticker--cache-contains newsticker--cache
1421 (intern name) title
1422 desc link 'feed)
1423 (setq something-was-added t))
1424 (setq newsticker--cache
1425 (newsticker--cache-add newsticker--cache (intern name)
1426 title desc link time 'feed position
1427 extra-elements time 'feed))
1428 something-was-added))
1429
1430(defun newsticker--parse-generic-items (name time itemlist
1431 title-fn desc-fn
1432 link-fn time-fn
1433 guid-fn extra-fn)
1434 "Parse generic news feed data.
1435Argument NAME gives the name of a news feed. TIME gives the
1436system time at which the data have been retrieved. ITEMLIST
1437contains the news items returned by the xml parser.
1438
1439The arguments TITLE-FN, DESC-FN, LINK-FN, TIME-FN, GUID-FN, and
1440EXTRA-FN give functions for extracting title, description, link,
1441time, guid, and extra-elements resp. They are called with one
1442argument, which is one of the items in ITEMLIST."
1443 (let (title desc link
1444 (old-item nil)
1445 (position 0)
1446 (something-was-added nil))
1447 ;; gather all items for this feed
1448 (mapc (lambda (node)
1449 (setq position (1+ position))
1450 (setq title (or (funcall title-fn node) "[untitled]"))
1451 (setq desc (funcall desc-fn node))
1452 (setq link (or (funcall link-fn node) ""))
1453 (setq time (or (funcall time-fn node) time))
1454 ;; It happened that the title or description
1455 ;; contained evil HTML code that confused the
1456 ;; xml parser. Therefore:
1457 (unless (stringp title)
1458 (setq title (prin1-to-string title)))
1459 (unless (or (stringp desc) (not desc))
1460 (setq desc (prin1-to-string desc)))
1461 ;; ignore items with empty title AND empty desc
1462 (when (or (> (length title) 0)
1463 (> (length desc) 0))
1464 ;; decode numeric entities
571855b6 1465 (setq title (xml-substitute-numeric-entities title))
2415d4c6 1466 (when desc
571855b6
UJ		 1467 (setq desc (xml-substitute-numeric-entities desc)))
1468 (setq link (xml-substitute-numeric-entities link))
2415d4c6
UJ		 1469 ;; remove whitespace from title, desc, and link
1470 (setq title (newsticker--remove-whitespace title))
1471 (setq desc (newsticker--remove-whitespace desc))
1472 (setq link (newsticker--remove-whitespace link))
1473 ;; add data to cache
1474 ;; do we have this item already?
1475 (let* ((guid (funcall guid-fn node)))
1476 ;;(message "guid=%s" guid)
1477 (setq old-item
1478 (newsticker--cache-contains newsticker--cache
1479 (intern name) title
1480 desc link nil guid)))
1481 ;; add this item, or mark it as old, or do nothing
1482 (let ((age1 'new)
1483 (age2 'old)
1484 (item-new-p nil))
1485 (if old-item
1486 (let ((prev-age (newsticker--age old-item)))
1487 (unless newsticker-automatically-mark-items-as-old
1488 ;; Some feeds deliver items multiply, the
1489 ;; first time we find an 'obsolete-old one the
1490 ;; cache, the following times we find an 'old
1491 ;; one
1492 (if (memq prev-age '(obsolete-old old))
1493 (setq age2 'old)
1494 (setq age2 'new)))
1495 (if (eq prev-age 'immortal)
1496 (setq age2 'immortal))
1497 (setq time (newsticker--time old-item)))
1498 ;; item was not there
1499 (setq item-new-p t)
1500 (setq something-was-added t))
1501 (setq newsticker--cache
1502 (newsticker--cache-add
1503 newsticker--cache (intern name) title desc link
1504 time age1 position (funcall extra-fn node)
1505 time age2))
1506 (when item-new-p
1507 (let ((item (newsticker--cache-contains
1508 newsticker--cache (intern name) title
1509 desc link nil)))
1510 (if newsticker-auto-mark-filter-list
1511 (newsticker--run-auto-mark-filter name item))
1512 (run-hook-with-args
1513 'newsticker-new-item-functions name item))))))
1514 itemlist)
1515 something-was-added))
1516
1517;; ======================================================================
1518;;; Misc
1519;; ======================================================================
2415d4c6
UJ		 1520
1521(defun newsticker--remove-whitespace (string)
1522 "Remove leading and trailing whitespace from STRING."
1523 ;; we must have ...+ but not ...* in the regexps otherwise xemacs loops
1524 ;; endlessly...
1525 (when (and string (stringp string))
1526 (replace-regexp-in-string
1527 "[ \t\r\n]+$" ""
1528 (replace-regexp-in-string "^[ \t\r\n]+" "" string))))
1529
1530(defun newsticker--do-forget-preformatted (item)
1531 "Forget pre-formatted data for ITEM.
1532Remove the pre-formatted from `newsticker--cache'."
1533 (if (nthcdr 7 item)
1534 (setcar (nthcdr 7 item) nil))
1535 (if (nthcdr 6 item)
1536 (setcar (nthcdr 6 item) nil)))
1537
1538(defun newsticker--forget-preformatted ()
1539 "Forget all cached pre-formatted data.
1540Remove the pre-formatted from `newsticker--cache'."
1541 (mapc (lambda (feed)
1542 (mapc 'newsticker--do-forget-preformatted
1543 (cdr feed)))
1544 newsticker--cache)
1545 (when (fboundp 'newsticker--buffer-set-uptodate)
1546 (newsticker--buffer-set-uptodate nil)))
1547
1548(defun newsticker--debug-msg (string &rest args)
1549 "Print newsticker debug messages.
1550This function calls `message' with arguments STRING and ARGS, if
1551`newsticker-debug' is non-nil."
1552 (and newsticker-debug
1553 ;;(not (active-minibuffer-window))
1554 ;;(not (current-message))
1555 (apply 'message string args)))
1556
1557(defun newsticker--decode-iso8601-date (iso8601-string)
1558 "Return ISO8601-STRING in format like `decode-time'.
1559Converts from ISO-8601 to Emacs representation.
1560Examples:
15612004-09-17T05:09:49.001+00:00
15622004-09-17T05:09:49+00:00
15632004-09-17T05:09+00:00
15642004-09-17T05:09:49
15652004-09-17T05:09
15662004-09-17
15672004-09
15682004"
1569 (if iso8601-string
1570 (when (string-match
1571 (concat
1572 "^ *\\([0-9]\\{4\\}\\)" ;year
1573 "\\(-\\([0-9]\\{2\\}\\)" ;month
1574 "\\(-\\([0-9]\\{2\\}\\)" ;day
1575 "\\(T"
1576 "\\([0-9]\\{2\\}\\):\\([0-9]\\{2\\}\\)" ;hour:minute
1577 "\\(:\\([0-9]\\{2\\}\\)\\(\\.[0-9]+\\)?\\)?" ;second
1578 ;timezone
1579 "\\(\\([-+Z]\\)\\(\\([0-9]\\{2\\}\\):\\([0-9]\\{2\\}\\)\\)?\\)?"
1580 "\\)?\\)?\\)? *$")
1581 iso8601-string)
1582 (let ((year (read (match-string 1 iso8601-string)))
1583 (month (read (or (match-string 3 iso8601-string)
1584 "1")))
1585 (day (read (or (match-string 5 iso8601-string)
1586 "1")))
1587 (hour (read (or (match-string 7 iso8601-string)
1588 "0")))
1589 (minute (read (or (match-string 8 iso8601-string)
1590 "0")))
1591 (second (read (or (match-string 10 iso8601-string)
1592 "0")))
1593 (sign (match-string 13 iso8601-string))
1594 (offset-hour (read (or (match-string 15 iso8601-string)
1595 "0")))
1596 (offset-minute (read (or (match-string 16 iso8601-string)
1597 "0"))))
1598 (cond ((string= sign "+")
1599 (setq hour (- hour offset-hour))
1600 (setq minute (- minute offset-minute)))
1601 ((string= sign "-")
1602 (setq hour (+ hour offset-hour))
1603 (setq minute (+ minute offset-minute))))
1604 ;; if UTC subtract current-time-zone offset
1605 ;;(setq second (+ (car (current-time-zone)) second)))
1606
1607 (condition-case nil
1608 (encode-time second minute hour day month year t)
1609 (error
1610 (message "Cannot decode \"%s\"" iso8601-string)
1611 nil))))
1612 nil))
1613
1614(defun newsticker--decode-rfc822-date (rfc822-string)
1615 "Return RFC822-STRING in format like `decode-time'.
1616Converts from RFC822 to Emacs representation.
1617Examples:
1618Sat, 07 September 2002 00:00:01 +0100
1619Sat, 07 September 2002 00:00:01 MET
1620Sat, 07 Sep 2002 00:00:01 GMT
162107 Sep 2002 00:00:01 GMT
162207 Sep 2002"
1623 (if (and rfc822-string (stringp rfc822-string))
1624 (when (string-match
1625 (concat
1626 "\\s-*"
1627 ;; week day
1628 "\\(\\(Mon\\|Tue\\|Wed\\|Thu\\|Fri\\|Sat\\|Sun\\)\\s-*,?\\)?\\s-*"
1629 ;; day
1630 "\\([0-9]\\{1,2\\}\\)\\s-+"
1631 ;; month
1632 "\\(Jan\\|Feb\\|Mar\\|Apr\\|May\\|Jun\\|"
1633 "Jul\\|Aug\\|Sep\\|Oct\\|Nov\\|Dec\\).*?\\s-+"
1634 ;; year
1635 "\\([0-9]\\{2,4\\}\\)"
1636 ;; time may be missing
1637 "\\(\\s-+"
1638 ;; hour
1639 "\\([0-9]\\{2\\}\\)"
1640 ;; minute
1641 ":\\([0-9]\\{2\\}\\)"
1642 ;; second
1643 "\\(:\\([0-9]\\{2\\}\\)\\)?"
1644 ;; zone -- fixme
1645 "\\(\\s-+\\("
1646 "UT\\|GMT\\|EST\\|EDT\\|CST\\|CDT\\|MST\\|MDT\\|PST\\|PDT"
1647 "\\|\\([-+]\\)\\([0-9]\\{2\\}\\)\\([0-9]\\{2\\}\\)"
1648 "\\)\\)?"
1649 "\\)?")
1650 rfc822-string)
1651 (let ((day (read (match-string 3 rfc822-string)))
1652 (month-name (match-string 4 rfc822-string))
1653 (month 0)
1654 (year (read (match-string 5 rfc822-string)))
1655 (hour (read (or (match-string 7 rfc822-string) "0")))
1656 (minute (read (or (match-string 8 rfc822-string) "0")))
1657 (second (read (or (match-string 10 rfc822-string) "0")))
1658 (zone (match-string 12 rfc822-string))
1659 (sign (match-string 13 rfc822-string))
1660 (offset-hour (read (or (match-string 14 rfc822-string)
1661 "0")))
1662 (offset-minute (read (or (match-string 15 rfc822-string)
1663 "0")))
1664 ;;FIXME
1665 )
1666 (when zone
1667 (cond ((string= sign "+")
1668 (setq hour (- hour offset-hour))
1669 (setq minute (- minute offset-minute)))
1670 ((string= sign "-")
1671 (setq hour (+ hour offset-hour))
1672 (setq minute (+ minute offset-minute)))))
1673 (condition-case error-data
1674 (let ((i 1))
1675 (mapc (lambda (m)
1676 (if (string= month-name m)
1677 (setq month i))
1678 (setq i (1+ i)))
1679 '("Jan" "Feb" "Mar" "Apr" "May" "Jun" "Jul" "Aug"
1680 "Sep" "Oct" "Nov" "Dec"))
1681 (encode-time second minute hour day month year t))
1682 (error
1683 (message "Cannot decode \"%s\": %s %s" rfc822-string
1684 (car error-data) (cdr error-data))
1685 nil))))
1686 nil))
1687
1688(defun newsticker--lists-intersect-p (list1 list2)
1689 "Return t if LIST1 and LIST2 share elements."
1690 (let ((result nil))
1691 (mapc (lambda (elt)
1692 (if (memq elt list2)
1693 (setq result t)))
1694 list1)
1695 result))
1696
1697(defun newsticker--update-process-ids ()
1698 "Update list of ids of active newsticker processes.
1699Checks list of active processes against list of newsticker processes."
1700 (let ((active-procs (process-list))
1701 (new-list nil))
1702 (mapc (lambda (proc)
1703 (let ((id (process-id proc)))
1704 (if (memq id newsticker--process-ids)
1705 (setq new-list (cons id new-list)))))
1706 active-procs)
1707 (setq newsticker--process-ids new-list))
1708 (force-mode-line-update))
1709
1710;; ======================================================================
1711;;; Images
1712;; ======================================================================
a59c6c51
UJ		 1713(defun newsticker--images-dir ()
1714 "Return directory where feed images are saved."
1715 (concat newsticker-dir "/images"))
1716
2415d4c6
UJ		 1717(defun newsticker--image-get (feed-name url)
1718 "Get image of the news site FEED-NAME from URL.
1719If the image has been downloaded in the last 24h do nothing."
a59c6c51 1720 (let ((image-name (concat (newsticker--images-dir) feed-name)))
2415d4c6
UJ		 1721 (if (and (file-exists-p image-name)
1722 (time-less-p (current-time)
1723 (time-add (nth 5 (file-attributes image-name))
1724 (seconds-to-time 86400))))
1725 (newsticker--debug-msg "%s: Getting image for %s skipped"
1726 (format-time-string "%A, %H:%M" (current-time))
1727 feed-name)
1728 ;; download
1729 (newsticker--debug-msg "%s: Getting image for %s"
1730 (format-time-string "%A, %H:%M" (current-time))
1731 feed-name)
1732 (let* ((buffername (concat " *newsticker-wget-image-" feed-name "*"))
1733 (item (or (assoc feed-name newsticker-url-list)
1734 (assoc feed-name newsticker-url-list-defaults)
1735 (error
1736 "Cannot get news for %s: Check newsticker-url-list"
1737 feed-name)))
1738 (wget-arguments (or (car (cdr (cdr (cdr (cdr item)))))
1739 newsticker-wget-arguments)))
9a529312 1740 (with-current-buffer (get-buffer-create buffername)
2415d4c6
UJ		 1741 (erase-buffer)
1742 ;; throw an error if there is an old wget-process around
1743 (if (get-process feed-name)
1744 (error "Another wget-process is running for image %s"
1745 feed-name))
1746 ;; start wget
1747 (let* ((args (append wget-arguments (list url)))
1748 (proc (apply 'start-process feed-name buffername
1749 newsticker-wget-name args)))
1750 (set-process-coding-system proc 'no-conversion 'no-conversion)
1751 (set-process-sentinel proc 'newsticker--image-sentinel)))))))
1752
1753(defun newsticker--image-sentinel (process event)
1754 "Sentinel for image-retrieving PROCESS caused by EVENT."
1755 (let* ((p-status (process-status process))
1756 (exit-status (process-exit-status process))
1757 (feed-name (process-name process)))
1758 ;; catch known errors (zombie processes, rubbish-xml, etc.)
1759 ;; if an error occurs the news feed is not updated!
1760 (catch 'oops
1761 (unless (and (eq p-status 'exit)
1762 (= exit-status 0))
1763 (message "%s: Error while retrieving image from %s"
1764 (format-time-string "%A, %H:%M" (current-time))
1765 feed-name)
1766 (throw 'oops nil))
1767 (let (image-name)
9a529312 1768 (with-current-buffer (process-buffer process)
a59c6c51 1769 (setq image-name (concat (newsticker--images-dir) feed-name))
2415d4c6
UJ		 1770 (set-buffer-file-coding-system 'no-conversion)
1771 ;; make sure the cache dir exists
a59c6c51
UJ		 1772 (unless (file-directory-p (newsticker--images-dir))
1773 (make-directory (newsticker--images-dir)))
2415d4c6
UJ		 1774 ;; write and close buffer
1775 (let ((require-final-newline nil)
1776 (backup-inhibited t)
1777 (coding-system-for-write 'no-conversion))
1778 (write-region nil nil image-name nil 'quiet))
1779 (set-buffer-modified-p nil)
1780 (kill-buffer (current-buffer)))))))
1781
2415d4c6
UJ		 1782(defun newsticker--insert-image (img string)
1783 "Insert IMG with STRING at point."
1784 (insert-image img string))
1785
1786;; ======================================================================
1787;;; HTML rendering
1788;; ======================================================================
1789(defun newsticker-htmlr-render (pos1 pos2) ;
1790 "Replacement for `htmlr-render'.
1791Renders the HTML code in the region POS1 to POS2 using htmlr."
1792 (let ((str (buffer-substring-no-properties pos1 pos2)))
1793 (delete-region pos1 pos2)
1794 (insert
1795 (with-temp-buffer
1796 (insert str)
1797 (goto-char (point-min))
1798 ;; begin original htmlr-render
1799 (when (fboundp 'htmlr-reset) (htmlr-reset))
1800 ;; something omitted here...
1801 (when (fboundp 'htmlr-step)
1802 (while (< (point) (point-max))
1803 (htmlr-step)))
1804 ;; end original htmlr-render
1805 (newsticker--remove-whitespace (buffer-string))))))
1806
1807;; ======================================================================
1808;;; Manipulation of cached data
1809;; ======================================================================
1810(defun newsticker--cache-set-preformatted-contents (item contents)
1811 "Set preformatted contents of ITEM to CONTENTS."
1812 (if (nthcdr 6 item)
1813 (setcar (nthcdr 6 item) contents)
1814 (setcdr (nthcdr 5 item) (list contents))))
1815
1816(defun newsticker--cache-set-preformatted-title (item title)
1817 "Set preformatted title of ITEM to TITLE."
1818 (if (nthcdr 7 item)
1819 (setcar (nthcdr 7 item) title)
1820 (setcdr (nthcdr 6 item) title)))
1821
1822(defun newsticker--cache-replace-age (data feed old-age new-age)
1823 "Mark all items in DATA in FEED which carry age OLD-AGE with NEW-AGE.
1824If FEED is 'any it applies to all feeds. If OLD-AGE is 'any,
1825all marks are replaced by NEW-AGE. Removes all pre-formatted contents."
1826 (mapc (lambda (a-feed)
1827 (when (or (eq feed 'any)
1828 (eq (car a-feed) feed))
1829 (let ((items (cdr a-feed)))
1830 (mapc (lambda (item)
1831 (when (or (eq old-age 'any)
1832 (eq (newsticker--age item) old-age))
1833 (setcar (nthcdr 4 item) new-age)
1834 (newsticker--do-forget-preformatted item)))
1835 items))))
1836 data)
1837 data)
1838
1839(defun newsticker--cache-mark-expired (data feed old-age new-age time)
1840 "Mark all expired entries.
1841This function sets the age entries in DATA in the feed FEED. If
1842an item's age is OLD-AGE it is set to NEW-AGE if the item is
1843older than TIME."
1844 (mapc
1845 (lambda (a-feed)
1846 (when (or (eq feed 'any)
1847 (eq (car a-feed) feed))
1848 (let ((items (cdr a-feed)))
1849 (mapc
1850 (lambda (item)
1851 (when (eq (newsticker--age item) old-age)
1852 (let ((exp-time (time-add (newsticker--time item)
1853 (seconds-to-time time))))
1854 (when (time-less-p exp-time (current-time))
1855 (newsticker--debug-msg
1856 "Item `%s' from %s has expired on %s"
1857 (newsticker--title item)
1858 (format-time-string "%Y-%02m-%d, %H:%M"
1859 (newsticker--time item))
1860 (format-time-string "%Y-%02m-%d, %H:%M" exp-time))
1861 (setcar (nthcdr 4 item) new-age)))))
1862 items))))
1863 data)
1864 data)
1865
1866(defun newsticker--cache-contains (data feed title desc link age
1867 &optional guid)
1868 "Check DATA whether FEED contains an item with the given properties.
1869This function returns the contained item or nil if it is not
1870contained.
1871The properties which are checked are TITLE, DESC, LINK, AGE, and
1872GUID. In general all properties must match in order to return a
1873certain item, except for the following cases.
1874
1875If AGE equals 'feed the TITLE, DESCription and LINK do not
1876matter. If DESC is nil it is ignored as well. If
1877`newsticker-desc-comp-max' is non-nil, only the first
1878`newsticker-desc-comp-max' characters of DESC are taken into
1879account.
1880
1881If GUID is non-nil it is sufficient to match this value, and the
1882other properties are ignored."
1883 ;;(newsticker--debug-msg "Looking for %s guid=%s" title guid)
1884 (condition-case nil
1885 (catch 'found
1886 (when (and desc newsticker-desc-comp-max
1887 (> (length desc) newsticker-desc-comp-max))
1888 (setq desc (substring desc 0 newsticker-desc-comp-max)))
1889 (mapc
1890 (lambda (this-feed)
1891 (when (eq (car this-feed) feed)
1892 (mapc (lambda (anitem)
1893 (when (cond (guid
1894 ;; global unique id can match
1895 (string= guid (newsticker--guid anitem)))
1896 (t;;FIXME?
1897 (or
1898 ;; or title, desc, etc.
1899 (and
1900 ;;(or (not (eq age 'feed))
1901 ;; (eq (newsticker--age anitem) 'feed))
1902 (string= (newsticker--title anitem)
1903 title)
1904 (or (not link)
1905 (string= (newsticker--link anitem)
1906 link))
1907 (or (not desc)
1908 (if (and desc newsticker-desc-comp-max
1909 (> (length (newsticker--desc
1910 anitem))
1911 newsticker-desc-comp-max))
1912 (string= (substring
1913 (newsticker--desc anitem)
a59c6c51 1914 0
2415d4c6
UJ		 1915 newsticker-desc-comp-max)
1916 desc)
1917 (string= (newsticker--desc anitem)
1918 desc)))))))
a59c6c51 1919 ;;(newsticker--debug-msg "Found %s guid=%s"
2415d4c6
UJ		 1920 ;; (newsticker--title anitem)
1921 ;; (newsticker--guid anitem))
1922 (throw 'found anitem)))
1923 (cdr this-feed))))
1924 data)
1925 ;;(newsticker--debug-msg "Found nothing")
1926 nil)
1927 (error nil)))
1928
1929(defun newsticker--cache-add (data feed-name-symbol title desc link time age
1930 position extra-elements
1931 &optional updated-time updated-age
1932 preformatted-contents
1933 preformatted-title)
1934 "Add another item to cache data.
1935Add to DATA in the FEED-NAME-SYMBOL an item with TITLE, DESC,
1936LINK, TIME, AGE, POSITION, and EXTRA-ELEMENTS. If this item is
1937contained already, its time is set to UPDATED-TIME, its mark is
1938set to UPDATED-AGE, and its pre-formatted contents is set to
1939PREFORMATTED-CONTENTS and PREFORMATTED-TITLE. Returns the age
1940which the item got."
1941 (let* ((guid (newsticker--guid-to-string (assoc 'guid extra-elements)))
1942 (item (newsticker--cache-contains data feed-name-symbol title desc link
1943 age guid)))
1944 ;;(message "guid=%s" guid)
1945 (if item
1946 ;; does exist already -- change age, update time and position
1947 (progn
a59c6c51 1948 ;;(newsticker--debug-msg "Updating item %s %s %s %s %s -> %s %s
2415d4c6
UJ		 1949 ;; (guid %s -> %s)"
1950 ;; feed-name-symbol title link time age
1951 ;; updated-time updated-age
1952 ;; guid (newsticker--guid item))
1953 (if (nthcdr 5 item)
1954 (setcar (nthcdr 5 item) position)
1955 (setcdr (nthcdr 4 item) (list position)))
1956 (setcar (nthcdr 4 item) updated-age)
1957 (if updated-time
1958 (setcar (nthcdr 3 item) updated-time))
1959 ;; replace cached pre-formatted contents
1960 (newsticker--cache-set-preformatted-contents
1961 item preformatted-contents)
1962 (newsticker--cache-set-preformatted-title
1963 item preformatted-title))
1964 ;; did not exist or age equals 'feed-name-symbol
1965 (setq item (list title desc link time age position preformatted-contents
1966 preformatted-title extra-elements))
1967 ;;(newsticker--debug-msg "Adding item %s" item)
1968 (catch 'found
1969 (mapc (lambda (this-feed)
1970 (when (eq (car this-feed) feed-name-symbol)
1971 (setcdr this-feed (nconc (cdr this-feed) (list item)))
1972 (throw 'found this-feed)))
1973 data)
1974 ;; the feed is not contained
1975 (add-to-list 'data (list feed-name-symbol item) t))))
1976 data)
1977
1978(defun newsticker--cache-remove (data feed-symbol age)
1979 "Remove all entries from DATA in the feed FEED-SYMBOL with AGE.
1980FEED-SYMBOL may be 'any. Entries from old feeds, which are no longer in
1981`newsticker-url-list' or `newsticker-url-list-defaults', are removed as
1982well."
1983 (let* ((pos data)
1984 (feed (car pos))
1985 (last-pos nil))
1986 (while feed
1987 (if (or (assoc (symbol-name (car feed)) newsticker-url-list)
1988 (assoc (symbol-name (car feed)) newsticker-url-list-defaults))
1989 ;; feed is still valid=active
1990 ;; (message "Keeping feed %s" (car feed))
1991 (if (or (eq feed-symbol 'any)
1992 (eq feed-symbol (car feed)))
1993 (let* ((item-pos (cdr feed))
1994 (item (car item-pos))
1995 (prev-pos nil))
1996 (while item
1997 ;;(message "%s" (car item))
1998 (if (eq age (newsticker--age item))
1999 ;; remove this item
2000 (progn
2001 ;;(message "Removing item %s" (car item))
2002 (if prev-pos
2003 (setcdr prev-pos (cdr item-pos))
2004 (setcdr feed (cdr item-pos))))
2005 ;;(message "Keeping item %s" (car item))
2006 (setq prev-pos item-pos))
2007 (setq item-pos (cdr item-pos))
2008 (setq item (car item-pos)))))
2009 ;; feed is not active anymore
2010 ;; (message "Removing feed %s" (car feed))
2011 (if last-pos
2012 (setcdr last-pos (cdr pos))
2013 (setq data (cdr pos))))
2014 (setq last-pos pos)
2015 (setq pos (cdr pos))
2016 (setq feed (car pos)))))
2017
2018;; ======================================================================
2019;;; Sorting
2020;; ======================================================================
2021(defun newsticker--cache-item-compare-by-time (item1 item2)
2022 "Compare two news items ITEM1 and ITEM2 by comparing their time values."
2023 (catch 'result
2024 (let ((age1 (newsticker--age item1))
2025 (age2 (newsticker--age item2)))
2026 (if (not (eq age1 age2))
2027 (cond ((eq age1 'obsolete)
2028 (throw 'result nil))
2029 ((eq age2 'obsolete)
2030 (throw 'result t)))))
2031 (let* ((time1 (newsticker--time item1))
2032 (time2 (newsticker--time item2)))
2033 (cond ((< (nth 0 time1) (nth 0 time2))
2034 nil)
2035 ((> (nth 0 time1) (nth 0 time2))
2036 t)
2037 ((< (nth 1 time1) (nth 1 time2))
2038 nil)
2039 ((> (nth 1 time1) (nth 1 time2))
2040 t)
2041 ((< (or (nth 2 time1) 0) (or (nth 2 time2) 0))
2042 nil)
2043 ((> (or (nth 2 time1) 0) (or (nth 2 time2) 0))
2044 t)
2045 (t
2046 nil)))))
2047
2048(defun newsticker--cache-item-compare-by-title (item1 item2)
2049 "Compare ITEM1 and ITEM2 by comparing their titles."
2050 (catch 'result
2051 (let ((age1 (newsticker--age item1))
2052 (age2 (newsticker--age item2)))
2053 (if (not (eq age1 age2))
2054 (cond ((eq age1 'obsolete)
2055 (throw 'result nil))
2056 ((eq age2 'obsolete)
2057 (throw 'result t)))))
2058 (string< (newsticker--title item1) (newsticker--title item2))))
2059
2060(defun newsticker--cache-item-compare-by-position (item1 item2)
2061 "Compare ITEM1 and ITEM2 by comparing their original positions."
2062 (catch 'result
2063 (let ((age1 (newsticker--age item1))
2064 (age2 (newsticker--age item2)))
2065 (if (not (eq age1 age2))
2066 (cond ((eq age1 'obsolete)
2067 (throw 'result nil))
2068 ((eq age2 'obsolete)
2069 (throw 'result t)))))
2070 (< (or (newsticker--pos item1) 0) (or (newsticker--pos item2) 0))))
2071
a59c6c51 2072(defun newsticker--cache-save-version1 ()
2415d4c6
UJ		 2073 "Update and save newsticker cache file."
2074 (interactive)
2075 (newsticker--cache-update t))
2076
2077(defun newsticker--cache-update (&optional save)
2078 "Update newsticker cache file.
2079If optional argument SAVE is not nil the cache file is saved to disk."
2080 (save-excursion
a59c6c51
UJ		 2081 (unless (file-directory-p newsticker-dir)
2082 (make-directory newsticker-dir t))
c9aafaaf
UJ		 2083 (let ((coding-system-for-write 'utf-8)
2084 (buf (find-file-noselect newsticker-cache-filename)))
2085 (when buf
2086 (set-buffer buf)
2415d4c6
UJ		 2087 (setq buffer-undo-list t)
2088 (erase-buffer)
2089 (insert ";; -*- coding: utf-8 -*-\n")
2090 (insert (prin1-to-string newsticker--cache))
2091 (when save
2415d4c6
UJ		 2092 (save-buffer))))))
2093
2094(defun newsticker--cache-get-feed (feed)
2095 "Return the cached data for the feed FEED.
2096FEED is a symbol!"
2097 (assoc feed newsticker--cache))
2098
a59c6c51
UJ		 2099(defun newsticker--cache-dir ()
2100 "Return directory for saving cache data."
2101 (concat newsticker-dir "/feeds"))
2102
2103(defun newsticker--cache-save ()
2104 "Save cache data for all feeds."
2105 (unless (file-directory-p newsticker-dir)
2106 (make-directory newsticker-dir t))
2107 (mapc 'newsticker--cache-save-feed newsticker--cache)
2108 nil)
2109
2110(defun newsticker--cache-save-feed (feed)
2111 "Save cache data for FEED."
2112 (let ((dir (concat (newsticker--cache-dir) "/" (symbol-name (car feed)))))
2113 (unless (file-directory-p dir)
2114 (make-directory dir t))
2115 (let ((coding-system-for-write 'utf-8))
2116 (with-temp-file (concat dir "/data")
2117 (insert ";; -*- coding: utf-8 -*-\n")
2118 (insert (prin1-to-string (cdr feed)))))))
2119
2120(defun newsticker--cache-read-version1 ()
2121 "Read version1 cache data."
2122 (let ((coding-system-for-read 'utf-8))
2123 (when (file-exists-p newsticker-cache-filename)
2124 (with-temp-buffer
2125 (insert-file-contents newsticker-cache-filename)
2126 (goto-char (point-min))
2127 (condition-case nil
2128 (setq newsticker--cache (read (current-buffer)))
2129 (error
2130 (message "Error while reading newsticker cache file!")
2131 (setq newsticker--cache nil)))))))
2132
2133(defun newsticker--cache-read ()
2134 "Read cache data."
2135 (setq newsticker--cache nil)
2136 (if (file-exists-p newsticker-cache-filename)
2137 (progn
2138 (when (y-or-n-p "Old newsticker cache file exists. Read it? ")
2139 (newsticker--cache-read-version1))
c04ed27e
UJ		 2140 (when (y-or-n-p (format "Delete old newsticker cache file? "))
2141 (delete-file newsticker-cache-filename)))
a59c6c51
UJ		 2142 (mapc (lambda (f)
2143 (newsticker--cache-read-feed (car f)))
2144 (append newsticker-url-list-defaults newsticker-url-list))))
2145
2146(defun newsticker--cache-read-feed (feed-name)
2147 "Read cache data for feed named FEED-NAME."
2148 (let ((file-name (concat (newsticker--cache-dir) "/" feed-name "/data"))
2149 (coding-system-for-read 'utf-8))
2150 (when (file-exists-p file-name)
2151 (with-temp-buffer
2152 (insert-file-contents file-name)
2153 (goto-char (point-min))
2154 (condition-case nil
2155 (add-to-list 'newsticker--cache (cons (intern feed-name)
2156 (read (current-buffer))))
2157 (error
2158 (message "Error while reading newsticker cache file %s!"
6188ea49
GM		 2159 file-name)
2160 (setq newsticker--cache nil)))))))
a59c6c51 2161
2415d4c6
UJ		 2162;; ======================================================================
2163;;; Statistics
2164;; ======================================================================
2165(defun newsticker--stat-num-items (feed &rest ages)
2166 "Return number of items in the given FEED which have one of the given AGES.
2167If AGES is nil, the total number of items is returned."
2168 (let ((items (cdr (newsticker--cache-get-feed feed)))
2169 (num 0))
2170 (while items
2171 (if ages
2172 (if (memq (newsticker--age (car items)) ages)
2173 (setq num (1+ num)))
2174 (if (memq (newsticker--age (car items)) '(new old immortal obsolete))
2175 (setq num (1+ num))))
2176 (setq items (cdr items)))
2177 num))
2178
2179(defun newsticker--stat-num-items-total (&optional age)
2180 "Return total number of items in all feeds which have the given AGE.
2181If AGE is nil, the total number of items is returned."
2182 (apply '+
2183 (mapcar (lambda (feed)
2184 (if age
2185 (newsticker--stat-num-items (intern (car feed)) age)
2186 (newsticker--stat-num-items (intern (car feed)))))
2187 (append newsticker-url-list-defaults newsticker-url-list))))
2188
2189;; ======================================================================
2190;;; OPML
2191;; ======================================================================
2192(defun newsticker-opml-export ()
2193 "OPML subscription export.
2194Export subscriptions to a buffer in OPML Format."
2195 (interactive)
2196 (with-current-buffer (get-buffer-create "*OPML Export*")
2197 (set-buffer-file-coding-system 'utf-8)
2198 (insert (concat
2199 "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
2200 "<!-- OPML generated by Emacs newsticker.el -->\n"
2201 "<opml version=\"1.0\">\n"
2202 " <head>\n"
2203 " <title>mySubscriptions</title>\n"
2204 " <dateCreated>" (format-time-string "%a, %d %b %Y %T %z")
2205 "</dateCreated>\n"
2206 " <ownerEmail>" user-mail-address "</ownerEmail>\n"
2207 " <ownerName>" (user-full-name) "</ownerName>\n"
2208 " </head>\n"
2209 " <body>\n"))
2210 (mapc (lambda (sub)
2211 (insert " <outline text=\"")
2212 (insert (newsticker--title sub))
2213 (insert "\" xmlUrl=\"")
2214 (insert (cadr sub))
2215 (insert "\"/>\n"))
2216 (append newsticker-url-list newsticker-url-list-defaults))
2217 (insert " </body>\n</opml>\n"))
2218 (pop-to-buffer "*OPML Export*")
2219 (when (fboundp 'sgml-mode)
2220 (sgml-mode)))
2221
2222(defun newsticker--opml-import-outlines (outlines)
2223 "Recursively import OUTLINES from OPML data.
2224Note that nested outlines are currently flattened -- i.e. grouping is
2225removed."
2226 (mapc (lambda (outline)
2227 (let ((name (xml-get-attribute outline 'text))
2228 (url (xml-get-attribute outline 'xmlUrl))
2229 (children (xml-get-children outline 'outline)))
2230 (unless (string= "" url)
2231 (add-to-list 'newsticker-url-list
2232 (list name url nil nil nil) t))
2233 (if children
2234 (newsticker--opml-import-outlines children))))
2235 outlines))
2236
2237(defun newsticker-opml-import (filename)
2238 "Import OPML data from FILENAME."
2239 (interactive "fOPML file: ")
2240 (set-buffer (find-file-noselect filename))
2241 (goto-char (point-min))
2242 (let* ((node-list (xml-parse-region (point-min) (point-max)))
2243 (body (car (xml-get-children (car node-list) 'body)))
2244 (outlines (xml-get-children body 'outline)))
2245 (newsticker--opml-import-outlines outlines))
2246 (customize-variable 'newsticker-url-list))
2247
2248;; ======================================================================
2249;;; Auto marking
2250;; ======================================================================
2251(defun newsticker--run-auto-mark-filter (feed item)
2252 "Automatically mark an item as old or immortal.
2253This function checks the variable `newsticker-auto-mark-filter-list'
2254for an entry that matches FEED and ITEM."
2255 (let ((case-fold-search t))
2256 (mapc (lambda (filter)
2257 (let ((filter-feed (car filter))
2258 (pattern-list (cadr filter)))
2259 (when (string-match filter-feed feed)
2260 (newsticker--do-run-auto-mark-filter item pattern-list))))
2261 newsticker-auto-mark-filter-list)))
2262
2263(defun newsticker--do-run-auto-mark-filter (item list)
2264 "Actually compare ITEM against the pattern-LIST.
2265LIST must be an element of `newsticker-auto-mark-filter-list'."
2266 (mapc (lambda (pattern)
2267 (let ((age (nth 0 pattern))
2268 (place (nth 1 pattern))
2269 (regexp (nth 2 pattern))
2270 (title (newsticker--title item))
2271 (desc (newsticker--desc item)))
2272 (when (or (eq place 'title) (eq place 'all))
2273 (when (and title (string-match regexp title))
2274 (newsticker--debug-msg "Auto-marking as %s: `%s'"
2275 age (newsticker--title item))
2276 (setcar (nthcdr 4 item) age)))
2277 (when (or (eq place 'description) (eq place 'all))
2278 (when (and desc (string-match regexp desc))
2279 (newsticker--debug-msg "Auto-marking as %s: `%s'"
2280 age (newsticker--title item))
2281 (setcar (nthcdr 4 item) age)))))
2282 list))
2283
2284
2285;; ======================================================================
2286;;; Hook samples
2287;; ======================================================================
2288(defun newsticker-new-item-functions-sample (feed item)
2289 "Demonstrate the use of the `newsticker-new-item-functions' hook.
2290This function just prints out the values of the FEED and title of the ITEM."
2291 (message (concat "newsticker-new-item-functions-sample: feed=`%s', "
2292 "title=`%s'")
2293 feed (newsticker--title item)))
2294
2295(defun newsticker-download-images (feed item)
2296 "Download the first image.
2297If FEED equals \"imagefeed\" download the first image URL found
2298in the description=contents of ITEM to the directory
2299\"~/tmp/newsticker/FEED/TITLE\" where TITLE is the title of the item."
2300 (when (string= feed "imagefeed")
2301 (let ((title (newsticker--title item))
2302 (desc (newsticker--desc item)))
2303 (when (string-match "<img src=\"\\(http://[^ \"]+\\)\"" desc)
2304 (let ((url (substring desc (match-beginning 1) (match-end 1)))
2305 (temp-dir (concat "~/tmp/newsticker/" feed "/" title))
2306 (org-dir default-directory))
2307 (unless (file-directory-p temp-dir)
2308 (make-directory temp-dir t))
2309 (cd temp-dir)
2310 (message "Getting image %s" url)
2311 (apply 'start-process "wget-image"
2312 " *newsticker-wget-download-images*"
2313 newsticker-wget-name
2314 (list url))
2315 (cd org-dir))))))
2316
2317(defun newsticker-download-enclosures (feed item)
2318 "In all FEEDs download the enclosed object of the news ITEM.
2319The object is saved to the directory \"~/tmp/newsticker/FEED/TITLE\", which
2320is created if it does not exist. TITLE is the title of the news
2321item. Argument FEED is ignored.
2322This function is suited for adding it to `newsticker-new-item-functions'."
2323 (let ((title (newsticker--title item))
2324 (enclosure (newsticker--enclosure item)))
2325 (when enclosure
2326 (let ((url (cdr (assoc 'url enclosure)))
2327 (temp-dir (concat "~/tmp/newsticker/" feed "/" title))
2328 (org-dir default-directory))
2329 (unless (file-directory-p temp-dir)
2330 (make-directory temp-dir t))
2331 (cd temp-dir)
2332 (message "Getting enclosure %s" url)
2333 (apply 'start-process "wget-enclosure"
2334 " *newsticker-wget-download-enclosures*"
2335 newsticker-wget-name
2336 (list url))
2337 (cd org-dir)))))
2338
2339;; ======================================================================
2340;;; Retrieve samples
2341;; ======================================================================
2342(defun newsticker-retrieve-random-message (feed-name)
2343 "Return an artificial RSS string under the name FEED-NAME."
2344 (concat "<?xml version=\"1.0\" encoding=\"iso-8859-1\" ?><rss version=\"0.91\">"
2345 "<channel>"
2346 "<title>newsticker-retrieve-random-message</title>"
2347 "<description>Sample retrieval function</description>"
2348 "<pubDate>FIXME Sat, 07 Sep 2005 00:00:01 GMT</pubDate>"
2349 "<item><title>" (format "Your lucky number is %d" (random 10000))
2350 "</title><description>" (format "Or maybe it is %d" (random 10000))
2351 "</description></item></channel></rss>"))
2352
8e39154d 2353(provide 'newst-backend)
2415d4c6 2354
041fa0d4 2355;; arch-tag: 0e37b658-56e9-49ab-90f9-f2df57e1a659
a59c6c51 2356;;; newst-backend.el ends here
Unnamed repository; edit this file 'description' to name the repository.