lisp/gnus/gnus-agent.el

   1 ;;; gnus-agent.el --- unplugged support for Gnus
   2 ;; Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
   3
   4 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   5 ;; This file is part of GNU Emacs.
   6
   7 ;; GNU Emacs is free software; you can redistribute it and/or modify
   8 ;; it under the terms of the GNU General Public License as published by
   9 ;; the Free Software Foundation; either version 2, or (at your option)
  10 ;; any later version.
  11
  12 ;; GNU Emacs is distributed in the hope that it will be useful,
  13 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 ;; GNU General Public License for more details.
  16
  17 ;; You should have received a copy of the GNU General Public License
  18 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  19 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20 ;; Boston, MA 02111-1307, USA.
  21
  22 ;;; Commentary:
  23
  24 ;;; Code:
  25
  26 (require 'gnus)
  27 (require 'gnus-cache)
  28 (require 'nnvirtual)
  29 (require 'gnus-sum)
  30 (require 'gnus-score)
  31 (eval-when-compile
  32   (if (featurep 'xemacs)
  33       (require 'itimer)
  34     (require 'timer))
  35   (require 'cl))
  36
  37 (defcustom gnus-agent-directory (nnheader-concat gnus-directory "agent/")
  38   "Where the Gnus agent will store its files."
  39   :group 'gnus-agent
  40   :type 'directory)
  41
  42 (defcustom gnus-agent-plugged-hook nil
  43   "Hook run when plugging into the network."
  44   :group 'gnus-agent
  45   :type 'hook)
  46
  47 (defcustom gnus-agent-unplugged-hook nil
  48   "Hook run when unplugging from the network."
  49   :group 'gnus-agent
  50   :type 'hook)
  51
  52 (defcustom gnus-agent-handle-level gnus-level-subscribed
  53   "Groups on levels higher than this variable will be ignored by the Agent."
  54   :group 'gnus-agent
  55   :type 'integer)
  56
  57 (defcustom gnus-agent-expire-days 7
  58   "Read articles older than this will be expired."
  59   :group 'gnus-agent
  60   :type 'integer)
  61
  62 (defcustom gnus-agent-expire-all nil
  63   "If non-nil, also expire unread, ticked and dormant articles.
  64 If nil, only read articles will be expired."
  65   :group 'gnus-agent
  66   :type 'boolean)
  67
  68 (defcustom gnus-agent-group-mode-hook nil
  69   "Hook run in Agent group minor modes."
  70   :group 'gnus-agent
  71   :type 'hook)
  72
  73 (defcustom gnus-agent-summary-mode-hook nil
  74   "Hook run in Agent summary minor modes."
  75   :group 'gnus-agent
  76   :type 'hook)
  77
  78 (defcustom gnus-agent-server-mode-hook nil
  79   "Hook run in Agent summary minor modes."
  80   :group 'gnus-agent
  81   :type 'hook)
  82
  83 (defcustom gnus-agent-confirmation-function 'y-or-n-p
  84   "Function to confirm when error happens."
  85   :version "21.1"
  86   :group 'gnus-agent
  87   :type 'function)
  88
  89 (defcustom gnus-agent-synchronize-flags 'ask
  90   "Indicate if flags are synchronized when you plug in.
  91 If this is `ask' the hook will query the user."
  92   :version "21.1"
  93   :type '(choice (const :tag "Always" t)
  94                  (const :tag "Never" nil)
  95                  (const :tag "Ask" ask))
  96   :group 'gnus-agent)
  97
  98 ;;; Internal variables
  99
 100 (defvar gnus-agent-history-buffers nil)
 101 (defvar gnus-agent-buffer-alist nil)
 102 (defvar gnus-agent-article-alist nil)
 103 (defvar gnus-agent-group-alist nil)
 104 (defvar gnus-agent-covered-methods nil)
 105 (defvar gnus-category-alist nil)
 106 (defvar gnus-agent-current-history nil)
 107 (defvar gnus-agent-overview-buffer nil)
 108 (defvar gnus-category-predicate-cache nil)
 109 (defvar gnus-category-group-cache nil)
 110 (defvar gnus-agent-spam-hashtb nil)
 111 (defvar gnus-agent-file-name nil)
 112 (defvar gnus-agent-send-mail-function nil)
 113 (defvar gnus-agent-file-coding-system 'raw-text)
 114
 115 ;; Dynamic variables
 116 (defvar gnus-headers)
 117 (defvar gnus-score)
 118
 119 ;;;
 120 ;;; Setup
 121 ;;;
 122
 123 (defun gnus-open-agent ()
 124   (setq gnus-agent t)
 125   (gnus-agent-read-servers)
 126   (gnus-category-read)
 127   (gnus-agent-create-buffer)
 128   (add-hook 'gnus-group-mode-hook 'gnus-agent-mode)
 129   (add-hook 'gnus-summary-mode-hook 'gnus-agent-mode)
 130   (add-hook 'gnus-server-mode-hook 'gnus-agent-mode))
 131
 132 (defun gnus-agent-create-buffer ()
 133   (if (gnus-buffer-live-p gnus-agent-overview-buffer)
 134       t
 135     (setq gnus-agent-overview-buffer
 136           (gnus-get-buffer-create " *Gnus agent overview*"))
 137     (with-current-buffer gnus-agent-overview-buffer
 138       (mm-enable-multibyte))
 139     nil))
 140
 141 (gnus-add-shutdown 'gnus-close-agent 'gnus)
 142
 143 (defun gnus-close-agent ()
 144   (setq gnus-agent-covered-methods nil
 145         gnus-category-predicate-cache nil
 146         gnus-category-group-cache nil
 147         gnus-agent-spam-hashtb nil)
 148   (gnus-kill-buffer gnus-agent-overview-buffer))
 149
 150 ;;;
 151 ;;; Utility functions
 152 ;;;
 153
 154 (defun gnus-agent-read-file (file)
 155   "Load FILE and do a `read' there."
 156   (with-temp-buffer
 157     (ignore-errors
 158       (nnheader-insert-file-contents file)
 159       (goto-char (point-min))
 160       (read (current-buffer)))))
 161
 162 (defsubst gnus-agent-method ()
 163   (concat (symbol-name (car gnus-command-method)) "/"
 164           (if (equal (cadr gnus-command-method) "")
 165               "unnamed"
 166             (cadr gnus-command-method))))
 167
 168 (defsubst gnus-agent-directory ()
 169   "Path of the Gnus agent directory."
 170   (nnheader-concat gnus-agent-directory
 171                    (nnheader-translate-file-chars (gnus-agent-method)) "/"))
 172
 173 (defun gnus-agent-lib-file (file)
 174   "The full path of the Gnus agent library FILE."
 175   (expand-file-name file
 176                     (file-name-as-directory
 177                      (expand-file-name "agent.lib" (gnus-agent-directory)))))
 178
 179 ;;; Fetching setup functions.
 180
 181 (defun gnus-agent-start-fetch ()
 182   "Initialize data structures for efficient fetching."
 183   (gnus-agent-open-history)
 184   (setq gnus-agent-current-history (gnus-agent-history-buffer))
 185   (gnus-agent-create-buffer))
 186
 187 (defun gnus-agent-stop-fetch ()
 188   "Save all data structures and clean up."
 189   (gnus-agent-save-history)
 190   (gnus-agent-close-history)
 191   (setq gnus-agent-spam-hashtb nil)
 192   (save-excursion
 193     (set-buffer nntp-server-buffer)
 194     (widen)))
 195
 196 (defmacro gnus-agent-with-fetch (&rest forms)
 197   "Do FORMS safely."
 198   `(unwind-protect
 199        (let ((gnus-agent-fetching t))
 200          (gnus-agent-start-fetch)
 201          ,@forms)
 202      (gnus-agent-stop-fetch)))
 203
 204 (put 'gnus-agent-with-fetch 'lisp-indent-function 0)
 205 (put 'gnus-agent-with-fetch 'edebug-form-spec '(body))
 206
 207 ;;;
 208 ;;; Mode infestation
 209 ;;;
 210
 211 (defvar gnus-agent-mode-hook nil
 212   "Hook run when installing agent mode.")
 213
 214 (defvar gnus-agent-mode nil)
 215 (defvar gnus-agent-mode-status '(gnus-agent-mode " Plugged"))
 216
 217 (defun gnus-agent-mode ()
 218   "Minor mode for providing a agent support in Gnus buffers."
 219   (let* ((buffer (progn (string-match "^gnus-\\(.*\\)-mode$"
 220                                       (symbol-name major-mode))
 221                         (match-string 1 (symbol-name major-mode))))
 222          (mode (intern (format "gnus-agent-%s-mode" buffer))))
 223     (set (make-local-variable 'gnus-agent-mode) t)
 224     (set mode nil)
 225     (set (make-local-variable mode) t)
 226     ;; Set up the menu.
 227     (when (gnus-visual-p 'agent-menu 'menu)
 228       (funcall (intern (format "gnus-agent-%s-make-menu-bar" buffer))))
 229     (unless (assq 'gnus-agent-mode minor-mode-alist)
 230       (push gnus-agent-mode-status minor-mode-alist))
 231     (unless (assq mode minor-mode-map-alist)
 232       (push (cons mode (symbol-value (intern (format "gnus-agent-%s-mode-map"
 233                                                      buffer))))
 234             minor-mode-map-alist))
 235     (when (eq major-mode 'gnus-group-mode)
 236       (gnus-agent-toggle-plugged gnus-plugged))
 237     (gnus-run-hooks 'gnus-agent-mode-hook
 238                     (intern (format "gnus-agent-%s-mode-hook" buffer)))))
 239
 240 (defvar gnus-agent-group-mode-map (make-sparse-keymap))
 241 (gnus-define-keys gnus-agent-group-mode-map
 242   "Ju" gnus-agent-fetch-groups
 243   "Jc" gnus-enter-category-buffer
 244   "Jj" gnus-agent-toggle-plugged
 245   "Js" gnus-agent-fetch-session
 246   "JY" gnus-agent-synchronize-flags
 247   "JS" gnus-group-send-drafts
 248   "Ja" gnus-agent-add-group
 249   "Jr" gnus-agent-remove-group)
 250
 251 (defun gnus-agent-group-make-menu-bar ()
 252   (unless (boundp 'gnus-agent-group-menu)
 253     (easy-menu-define
 254      gnus-agent-group-menu gnus-agent-group-mode-map ""
 255      '("Agent"
 256        ["Toggle plugged" gnus-agent-toggle-plugged t]
 257        ["List categories" gnus-enter-category-buffer t]
 258        ["Send drafts" gnus-group-send-drafts gnus-plugged]
 259        ("Fetch"
 260         ["All" gnus-agent-fetch-session gnus-plugged]
 261         ["Group" gnus-agent-fetch-group gnus-plugged])))))
 262
 263 (defvar gnus-agent-summary-mode-map (make-sparse-keymap))
 264 (gnus-define-keys gnus-agent-summary-mode-map
 265   "Jj" gnus-agent-toggle-plugged
 266   "J#" gnus-agent-mark-article
 267   "J\M-#" gnus-agent-unmark-article
 268   "@" gnus-agent-toggle-mark
 269   "Jc" gnus-agent-catchup)
 270
 271 (defun gnus-agent-summary-make-menu-bar ()
 272   (unless (boundp 'gnus-agent-summary-menu)
 273     (easy-menu-define
 274      gnus-agent-summary-menu gnus-agent-summary-mode-map ""
 275      '("Agent"
 276        ["Toggle plugged" gnus-agent-toggle-plugged t]
 277        ["Mark as downloadable" gnus-agent-mark-article t]
 278        ["Unmark as downloadable" gnus-agent-unmark-article t]
 279        ["Toggle mark" gnus-agent-toggle-mark t]
 280        ["Catchup undownloaded" gnus-agent-catchup t]))))
 281
 282 (defvar gnus-agent-server-mode-map (make-sparse-keymap))
 283 (gnus-define-keys gnus-agent-server-mode-map
 284   "Jj" gnus-agent-toggle-plugged
 285   "Ja" gnus-agent-add-server
 286   "Jr" gnus-agent-remove-server)
 287
 288 (defun gnus-agent-server-make-menu-bar ()
 289   (unless (boundp 'gnus-agent-server-menu)
 290     (easy-menu-define
 291      gnus-agent-server-menu gnus-agent-server-mode-map ""
 292      '("Agent"
 293        ["Toggle plugged" gnus-agent-toggle-plugged t]
 294        ["Add" gnus-agent-add-server t]
 295        ["Remove" gnus-agent-remove-server t]))))
 296
 297 (defun gnus-agent-toggle-plugged (plugged)
 298   "Toggle whether Gnus is unplugged or not."
 299   (interactive (list (not gnus-plugged)))
 300   (if plugged
 301       (progn
 302         (setq gnus-plugged plugged)
 303         (gnus-agent-possibly-synchronize-flags)
 304         (gnus-run-hooks 'gnus-agent-plugged-hook)
 305         (setcar (cdr gnus-agent-mode-status) " Plugged"))
 306     (gnus-agent-close-connections)
 307     (setq gnus-plugged plugged)
 308     (gnus-run-hooks 'gnus-agent-unplugged-hook)
 309     (setcar (cdr gnus-agent-mode-status) " Unplugged"))
 310   (set-buffer-modified-p t))
 311
 312 (defun gnus-agent-close-connections ()
 313   "Close all methods covered by the Gnus agent."
 314   (let ((methods gnus-agent-covered-methods))
 315     (while methods
 316       (gnus-close-server (pop methods)))))
 317
 318 ;;;###autoload
 319 (defun gnus-unplugged ()
 320   "Start Gnus unplugged."
 321   (interactive)
 322   (setq gnus-plugged nil)
 323   (gnus))
 324
 325 ;;;###autoload
 326 (defun gnus-plugged ()
 327   "Start Gnus plugged."
 328   (interactive)
 329   (setq gnus-plugged t)
 330   (gnus))
 331
 332 ;;;###autoload
 333 (defun gnus-agentize ()
 334   "Allow Gnus to be an offline newsreader.
 335 The normal usage of this command is to put the following as the
 336 last form in your `.gnus.el' file:
 337
 338 \(gnus-agentize)
 339
 340 This will modify the `gnus-before-startup-hook', `gnus-post-method',
 341 and `message-send-mail-function' variables, and install the Gnus
 342 agent minor mode in all Gnus buffers."
 343   (interactive)
 344   (gnus-open-agent)
 345   (add-hook 'gnus-setup-news-hook 'gnus-agent-queue-setup)
 346   (unless gnus-agent-send-mail-function
 347     (setq gnus-agent-send-mail-function message-send-mail-function
 348           message-send-mail-function 'gnus-agent-send-mail))
 349   (unless gnus-agent-covered-methods
 350     (setq gnus-agent-covered-methods (list gnus-select-method))))
 351
 352 (defun gnus-agent-queue-setup ()
 353   "Make sure the queue group exists."
 354   (unless (gnus-gethash "nndraft:queue" gnus-newsrc-hashtb)
 355     (gnus-request-create-group "queue" '(nndraft ""))
 356     (let ((gnus-level-default-subscribed 1))
 357       (gnus-subscribe-group "nndraft:queue" nil '(nndraft "")))
 358     (gnus-group-set-parameter
 359      "nndraft:queue" 'gnus-dummy '((gnus-draft-mode)))))
 360
 361 (defun gnus-agent-send-mail ()
 362   (if gnus-plugged
 363       (funcall gnus-agent-send-mail-function)
 364     (goto-char (point-min))
 365     (re-search-forward
 366      (concat "^" (regexp-quote mail-header-separator) "\n"))
 367     (replace-match "\n")
 368     (gnus-agent-insert-meta-information 'mail)
 369     (gnus-request-accept-article "nndraft:queue" nil t t)))
 370
 371 (defun gnus-agent-insert-meta-information (type &optional method)
 372   "Insert meta-information into the message that says how it's to be posted.
 373 TYPE can be either `mail' or `news'.  If the latter METHOD can
 374 be a select method."
 375   (save-excursion
 376     (message-remove-header gnus-agent-meta-information-header)
 377     (goto-char (point-min))
 378     (insert gnus-agent-meta-information-header ": "
 379             (symbol-name type) " " (format "%S" method)
 380             "\n")
 381     (forward-char -1)
 382     (while (search-backward "\n" nil t)
 383       (replace-match "\\n" t t))))
 384
 385 (defun gnus-agent-restore-gcc ()
 386   "Restore GCC field from saved header."
 387   (save-excursion
 388     (goto-char (point-min))
 389     (while (re-search-forward (concat gnus-agent-gcc-header ":") nil t)
 390       (replace-match "Gcc:" 'fixedcase))))
 391
 392 (defun gnus-agent-any-covered-gcc ()
 393   (save-restriction
 394     (message-narrow-to-headers)
 395     (let* ((gcc (mail-fetch-field "gcc" nil t))
 396            (methods (and gcc
 397                          (mapcar 'gnus-inews-group-method
 398                                  (message-unquote-tokens
 399                                   (message-tokenize-header
 400                                    gcc " ,")))))
 401            covered)
 402       (while (and (not covered) methods)
 403         (setq covered
 404               (member (car methods) gnus-agent-covered-methods)
 405               methods (cdr methods)))
 406       covered)))
 407
 408 (defun gnus-agent-possibly-save-gcc ()
 409   "Save GCC if Gnus is unplugged."
 410   (when (and (not gnus-plugged) (gnus-agent-any-covered-gcc))
 411     (save-excursion
 412       (goto-char (point-min))
 413       (let ((case-fold-search t))
 414         (while (re-search-forward "^gcc:" nil t)
 415           (replace-match (concat gnus-agent-gcc-header ":") 'fixedcase))))))
 416
 417 (defun gnus-agent-possibly-do-gcc ()
 418   "Do GCC if Gnus is plugged."
 419   (when (or gnus-plugged (not (gnus-agent-any-covered-gcc)))
 420     (gnus-inews-do-gcc)))
 421
 422 ;;;
 423 ;;; Group mode commands
 424 ;;;
 425
 426 (defun gnus-agent-fetch-groups (n)
 427   "Put all new articles in the current groups into the Agent."
 428   (interactive "P")
 429   (unless gnus-plugged
 430     (error "Groups can't be fetched when Gnus is unplugged"))
 431   (gnus-group-iterate n 'gnus-agent-fetch-group))
 432
 433 (defun gnus-agent-fetch-group (group)
 434   "Put all new articles in GROUP into the Agent."
 435   (interactive (list (gnus-group-group-name)))
 436   (unless gnus-plugged
 437     (error "Groups can't be fetched when Gnus is unplugged"))
 438   (unless group
 439     (error "No group on the current line"))
 440   (let ((gnus-command-method (gnus-find-method-for-group group)))
 441     (gnus-agent-with-fetch
 442       (gnus-agent-fetch-group-1 group gnus-command-method)
 443       (gnus-message 5 "Fetching %s...done" group))))
 444
 445 (defun gnus-agent-add-group (category arg)
 446   "Add the current group to an agent category."
 447   (interactive
 448    (list
 449     (intern
 450      (completing-read
 451       "Add to category: "
 452       (mapcar (lambda (cat) (list (symbol-name (car cat))))
 453               gnus-category-alist)
 454       nil t))
 455     current-prefix-arg))
 456   (let ((cat (assq category gnus-category-alist))
 457         c groups)
 458     (gnus-group-iterate arg
 459       (lambda (group)
 460         (when (cadddr (setq c (gnus-group-category group)))
 461           (setf (cadddr c) (delete group (cadddr c))))
 462         (push group groups)))
 463     (setf (cadddr cat) (nconc (cadddr cat) groups))
 464     (gnus-category-write)))
 465
 466 (defun gnus-agent-remove-group (arg)
 467   "Remove the current group from its agent category, if any."
 468   (interactive "P")
 469   (let (c)
 470     (gnus-group-iterate arg
 471       (lambda (group)
 472         (when (cadddr (setq c (gnus-group-category group)))
 473           (setf (cadddr c) (delete group (cadddr c))))))
 474     (gnus-category-write)))
 475
 476 (defun gnus-agent-synchronize-flags ()
 477   "Synchronize unplugged flags with servers."
 478   (interactive)
 479   (save-excursion
 480     (dolist (gnus-command-method gnus-agent-covered-methods)
 481       (when (file-exists-p (gnus-agent-lib-file "flags"))
 482         (gnus-agent-synchronize-flags-server gnus-command-method)))))
 483
 484 (defun gnus-agent-possibly-synchronize-flags ()
 485   "Synchronize flags according to `gnus-agent-synchronize-flags'."
 486   (interactive)
 487   (save-excursion
 488     (dolist (gnus-command-method gnus-agent-covered-methods)
 489       (when (file-exists-p (gnus-agent-lib-file "flags"))
 490         (gnus-agent-possibly-synchronize-flags-server gnus-command-method)))))
 491
 492 (defun gnus-agent-synchronize-flags-server (method)
 493   "Synchronize flags set when unplugged for server."
 494   (let ((gnus-command-method method))
 495     (when (file-exists-p (gnus-agent-lib-file "flags"))
 496       (set-buffer (get-buffer-create " *Gnus Agent flag synchronize*"))
 497       (erase-buffer)
 498       (nnheader-insert-file-contents (gnus-agent-lib-file "flags"))
 499       (if (null (gnus-check-server gnus-command-method))
 500           (message "Couldn't open server %s" (nth 1 gnus-command-method))
 501         (while (not (eobp))
 502           (if (null (eval (read (current-buffer))))
 503               (progn (forward-line)
 504                      (kill-line -1))
 505             (write-file (gnus-agent-lib-file "flags"))
 506             (error "Couldn't set flags from file %s"
 507                    (gnus-agent-lib-file "flags"))))
 508         (delete-file (gnus-agent-lib-file "flags")))
 509       (kill-buffer nil))))
 510
 511 (defun gnus-agent-possibly-synchronize-flags-server (method)
 512   "Synchronize flags for server according to `gnus-agent-synchronize-flags'."
 513   (when (or (and gnus-agent-synchronize-flags
 514                  (not (eq gnus-agent-synchronize-flags 'ask)))
 515             (and (eq gnus-agent-synchronize-flags 'ask)
 516                  (gnus-y-or-n-p (format "Synchronize flags on server `%s'? "
 517                                         (cadr method)))))
 518     (gnus-agent-synchronize-flags-server method)))
 519
 520 ;;;
 521 ;;; Server mode commands
 522 ;;;
 523
 524 (defun gnus-agent-add-server (server)
 525   "Enroll SERVER in the agent program."
 526   (interactive (list (gnus-server-server-name)))
 527   (unless server
 528     (error "No server on the current line"))
 529   (let ((method (gnus-server-get-method nil (gnus-server-server-name))))
 530     (when (member method gnus-agent-covered-methods)
 531       (error "Server already in the agent program"))
 532     (push method gnus-agent-covered-methods)
 533     (gnus-agent-write-servers)
 534     (message "Entered %s into the Agent" server)))
 535
 536 (defun gnus-agent-remove-server (server)
 537   "Remove SERVER from the agent program."
 538   (interactive (list (gnus-server-server-name)))
 539   (unless server
 540     (error "No server on the current line"))
 541   (let ((method (gnus-server-get-method nil (gnus-server-server-name))))
 542     (unless (member method gnus-agent-covered-methods)
 543       (error "Server not in the agent program"))
 544     (setq gnus-agent-covered-methods
 545           (delete method gnus-agent-covered-methods))
 546     (gnus-agent-write-servers)
 547     (message "Removed %s from the agent" server)))
 548
 549 (defun gnus-agent-read-servers ()
 550   "Read the alist of covered servers."
 551   (setq gnus-agent-covered-methods
 552         (gnus-agent-read-file
 553          (nnheader-concat gnus-agent-directory "lib/servers"))))
 554
 555 (defun gnus-agent-write-servers ()
 556   "Write the alist of covered servers."
 557   (gnus-make-directory (nnheader-concat gnus-agent-directory "lib"))
 558   (let ((coding-system-for-write nnheader-file-coding-system)
 559         (file-name-coding-system nnmail-pathname-coding-system))
 560     (with-temp-file (nnheader-concat gnus-agent-directory "lib/servers")
 561       (prin1 gnus-agent-covered-methods (current-buffer)))))
 562
 563 ;;;
 564 ;;; Summary commands
 565 ;;;
 566
 567 (defun gnus-agent-mark-article (n &optional unmark)
 568   "Mark the next N articles as downloadable.
 569 If N is negative, mark backward instead.  If UNMARK is non-nil, remove
 570 the mark instead.  The difference between N and the actual number of
 571 articles marked is returned."
 572   (interactive "p")
 573   (let ((backward (< n 0))
 574         (n (abs n)))
 575     (while (and
 576             (> n 0)
 577             (progn
 578               (gnus-summary-set-agent-mark
 579                (gnus-summary-article-number) unmark)
 580               (zerop (gnus-summary-next-subject (if backward -1 1) nil t))))
 581       (setq n (1- n)))
 582     (when (/= 0 n)
 583       (gnus-message 7 "No more articles"))
 584     (gnus-summary-recenter)
 585     (gnus-summary-position-point)
 586     n))
 587
 588 (defun gnus-agent-unmark-article (n)
 589   "Remove the downloadable mark from the next N articles.
 590 If N is negative, unmark backward instead.  The difference between N and
 591 the actual number of articles unmarked is returned."
 592   (interactive "p")
 593   (gnus-agent-mark-article n t))
 594
 595 (defun gnus-agent-toggle-mark (n)
 596   "Toggle the downloadable mark from the next N articles.
 597 If N is negative, toggle backward instead.  The difference between N and
 598 the actual number of articles toggled is returned."
 599   (interactive "p")
 600   (gnus-agent-mark-article n 'toggle))
 601
 602 (defun gnus-summary-set-agent-mark (article &optional unmark)
 603   "Mark ARTICLE as downloadable."
 604   (let ((unmark (if (and (not (null unmark)) (not (eq t unmark)))
 605                     (memq article gnus-newsgroup-downloadable)
 606                   unmark)))
 607     (if unmark
 608         (progn
 609           (setq gnus-newsgroup-downloadable
 610                 (delq article gnus-newsgroup-downloadable))
 611           (push article gnus-newsgroup-undownloaded))
 612       (setq gnus-newsgroup-undownloaded
 613             (delq article gnus-newsgroup-undownloaded))
 614       (push article gnus-newsgroup-downloadable))
 615     (gnus-summary-update-mark
 616      (if unmark gnus-undownloaded-mark gnus-downloadable-mark)
 617      'unread)))
 618
 619 (defun gnus-agent-get-undownloaded-list ()
 620   "Mark all unfetched articles as read."
 621   (let ((gnus-command-method (gnus-find-method-for-group gnus-newsgroup-name)))
 622     (when (and (not gnus-plugged)
 623                (gnus-agent-method-p gnus-command-method))
 624       (gnus-agent-load-alist gnus-newsgroup-name)
 625       ;; First mark all undownloaded articles as undownloaded.
 626       (let ((articles (append gnus-newsgroup-unreads
 627                               gnus-newsgroup-marked
 628                               gnus-newsgroup-dormant))
 629             article)
 630         (while (setq article (pop articles))
 631           (unless (or (cdr (assq article gnus-agent-article-alist))
 632                       (memq article gnus-newsgroup-downloadable)
 633                       (memq article gnus-newsgroup-cached))
 634             (push article gnus-newsgroup-undownloaded))))
 635       ;; Then mark downloaded downloadable as not-downloadable,
 636       ;; if you get my drift.
 637       (let ((articles gnus-newsgroup-downloadable)
 638             article)
 639         (while (setq article (pop articles))
 640           (when (cdr (assq article gnus-agent-article-alist))
 641             (setq gnus-newsgroup-downloadable
 642                   (delq article gnus-newsgroup-downloadable))))))))
 643
 644 (defun gnus-agent-catchup ()
 645   "Mark all undownloaded articles as read."
 646   (interactive)
 647   (save-excursion
 648     (while gnus-newsgroup-undownloaded
 649       (gnus-summary-mark-article
 650        (pop gnus-newsgroup-undownloaded) gnus-catchup-mark)))
 651   (gnus-summary-position-point))
 652
 653 ;;;
 654 ;;; Internal functions
 655 ;;;
 656
 657 (defun gnus-agent-save-active (method)
 658   (gnus-agent-save-active-1 method 'gnus-active-to-gnus-format))
 659
 660 (defun gnus-agent-save-active-1 (method function)
 661   (when (gnus-agent-method-p method)
 662     (let* ((gnus-command-method method)
 663            (new (gnus-make-hashtable (count-lines (point-min) (point-max))))
 664            (file (gnus-agent-lib-file "active")))
 665       (funcall function nil new)
 666       (gnus-agent-write-active file new)
 667       (erase-buffer)
 668       (nnheader-insert-file-contents file))))
 669
 670 (defun gnus-agent-write-active (file new)
 671   (let ((orig (gnus-make-hashtable (count-lines (point-min) (point-max))))
 672         (file (gnus-agent-lib-file "active"))
 673         elem osym)
 674     (when (file-exists-p file)
 675       (with-temp-buffer
 676         (nnheader-insert-file-contents file)
 677         (gnus-active-to-gnus-format nil orig))
 678       (mapatoms
 679        (lambda (sym)
 680          (when (and sym (boundp sym))
 681            (if (and (boundp (setq osym (intern (symbol-name sym) orig)))
 682                     (setq elem (symbol-value osym)))
 683                (setcdr elem (cdr (symbol-value sym)))
 684              (set (intern (symbol-name sym) orig) (symbol-value sym)))))
 685        new))
 686     (gnus-make-directory (file-name-directory file))
 687     (let ((coding-system-for-write gnus-agent-file-coding-system))
 688       ;; The hashtable contains real names of groups,  no more prefix
 689       ;; removing, so set `full' to `t'.
 690       (gnus-write-active-file file orig t))))
 691
 692 (defun gnus-agent-save-groups (method)
 693   (gnus-agent-save-active-1 method 'gnus-groups-to-gnus-format))
 694
 695 (defun gnus-agent-save-group-info (method group active)
 696   (when (gnus-agent-method-p method)
 697     (let* ((gnus-command-method method)
 698            (coding-system-for-write nnheader-file-coding-system)
 699            (file-name-coding-system nnmail-pathname-coding-system)
 700            (file (gnus-agent-lib-file "active"))
 701            oactive)
 702       (gnus-make-directory (file-name-directory file))
 703       (with-temp-file file
 704         ;; Emacs got problem to match non-ASCII group in multibyte buffer.
 705         (mm-disable-multibyte)
 706         (when (file-exists-p file)
 707           (nnheader-insert-file-contents file))
 708         (goto-char (point-min))
 709         (when (re-search-forward
 710                (concat "^" (regexp-quote group) " ") nil t)
 711           (save-excursion
 712             (save-restriction
 713               (narrow-to-region (match-beginning 0)
 714                                 (progn
 715                                   (forward-line 1)
 716                                   (point)))
 717               (setq oactive (car (nnmail-parse-active)))))
 718           (gnus-delete-line))
 719         (insert (format "%S %d %d y\n" (intern group)
 720                         (cdr active)
 721                         (or (car oactive) (car active))))
 722         (goto-char (point-max))
 723         (while (search-backward "\\." nil t)
 724           (delete-char 1))))))
 725
 726 (defun gnus-agent-group-path (group)
 727   "Translate GROUP into a path."
 728   (if nnmail-use-long-file-names
 729       (gnus-group-real-name group)
 730     (nnheader-translate-file-chars
 731      (nnheader-replace-chars-in-string
 732       (nnheader-replace-duplicate-chars-in-string
 733        (nnheader-replace-chars-in-string
 734         (gnus-group-real-name group)
 735         ?/ ?_)
 736        ?. ?_)
 737       ?. ?/))))
 738
 739 \f
 740
 741 (defun gnus-agent-method-p (method)
 742   "Say whether METHOD is covered by the agent."
 743   (member method gnus-agent-covered-methods))
 744
 745 (defun gnus-agent-get-function (method)
 746   (if (and (not gnus-plugged)
 747            (gnus-agent-method-p method))
 748       (progn
 749         (require 'nnagent)
 750         'nnagent)
 751     (car method)))
 752
 753 ;;; History functions
 754
 755 (defun gnus-agent-history-buffer ()
 756   (cdr (assoc (gnus-agent-method) gnus-agent-history-buffers)))
 757
 758 (defun gnus-agent-open-history ()
 759   (save-excursion
 760     (push (cons (gnus-agent-method)
 761                 (set-buffer (gnus-get-buffer-create
 762                              (format " *Gnus agent %s history*"
 763                                      (gnus-agent-method)))))
 764           gnus-agent-history-buffers)
 765     (mm-disable-multibyte) ;; everything is binary
 766     (erase-buffer)
 767     (insert "\n")
 768     (let ((file (gnus-agent-lib-file "history")))
 769       (when (file-exists-p file)
 770         (nnheader-insert-file-contents file))
 771       (set (make-local-variable 'gnus-agent-file-name) file))))
 772
 773 (defun gnus-agent-save-history ()
 774   (save-excursion
 775     (set-buffer gnus-agent-current-history)
 776     (gnus-make-directory (file-name-directory gnus-agent-file-name))
 777     (let ((coding-system-for-write gnus-agent-file-coding-system))
 778       (write-region (1+ (point-min)) (point-max)
 779                     gnus-agent-file-name nil 'silent))))
 780
 781 (defun gnus-agent-close-history ()
 782   (when (gnus-buffer-live-p gnus-agent-current-history)
 783     (kill-buffer gnus-agent-current-history)
 784     (setq gnus-agent-history-buffers
 785           (delq (assoc (gnus-agent-method) gnus-agent-history-buffers)
 786                 gnus-agent-history-buffers))))
 787
 788 (defun gnus-agent-enter-history (id group-arts date)
 789   (save-excursion
 790     (set-buffer gnus-agent-current-history)
 791     (goto-char (point-max))
 792     (let ((p (point)))
 793       (insert id "\t" (number-to-string date) "\t")
 794       (while group-arts
 795         (insert (format "%S" (intern (caar group-arts)))
 796                 " " (number-to-string (cdr (pop group-arts)))
 797                 " "))
 798       (insert "\n")
 799       (while (search-backward "\\." p t)
 800         (delete-char 1)))))
 801
 802 (defun gnus-agent-article-in-history-p (id)
 803   (save-excursion
 804     (set-buffer (gnus-agent-history-buffer))
 805     (goto-char (point-min))
 806     (search-forward (concat "\n" id "\t") nil t)))
 807
 808 (defun gnus-agent-history-path (id)
 809   (save-excursion
 810     (set-buffer (gnus-agent-history-buffer))
 811     (goto-char (point-min))
 812     (when (search-forward (concat "\n" id "\t") nil t)
 813       (let ((method (gnus-agent-method)))
 814         (let (paths group)
 815           (while (not (numberp (setq group (read (current-buffer)))))
 816             (push (concat method "/" group) paths))
 817           (nreverse paths))))))
 818
 819 ;;;
 820 ;;; Fetching
 821 ;;;
 822
 823 (defun gnus-agent-fetch-articles (group articles)
 824   "Fetch ARTICLES from GROUP and put them into the Agent."
 825   (when articles
 826     ;; Prune off articles that we have already fetched.
 827     (while (and articles
 828                 (cdr (assq (car articles) gnus-agent-article-alist)))
 829       (pop articles))
 830     (let ((arts articles))
 831       (while (cdr arts)
 832         (if (cdr (assq (cadr arts) gnus-agent-article-alist))
 833             (setcdr arts (cddr arts))
 834           (setq arts (cdr arts)))))
 835     (when articles
 836       (let ((dir (concat
 837                   (gnus-agent-directory)
 838                   (gnus-agent-group-path group) "/"))
 839             (date (time-to-days (current-time)))
 840             (case-fold-search t)
 841             pos crosses id elem)
 842         (gnus-make-directory dir)
 843         (gnus-message 7 "Fetching articles for %s..." group)
 844         ;; Fetch the articles from the backend.
 845         (if (gnus-check-backend-function 'retrieve-articles group)
 846             (setq pos (gnus-retrieve-articles articles group))
 847           (with-temp-buffer
 848             (let (article)
 849               (while (setq article (pop articles))
 850                 (when (or
 851                        (gnus-backlog-request-article group article
 852                                                      nntp-server-buffer)
 853                        (gnus-request-article article group))
 854                   (goto-char (point-max))
 855                   (push (cons article (point)) pos)
 856                   (insert-buffer-substring nntp-server-buffer)))
 857               (copy-to-buffer nntp-server-buffer (point-min) (point-max))
 858               (setq pos (nreverse pos)))))
 859         ;; Then save these articles into the Agent.
 860         (save-excursion
 861           (set-buffer nntp-server-buffer)
 862           (while pos
 863             (narrow-to-region (cdar pos) (or (cdadr pos) (point-max)))
 864             (goto-char (point-min))
 865             (when (search-forward "\n\n" nil t)
 866               (when (search-backward "\nXrefs: " nil t)
 867                 ;; Handle crossposting.
 868                 (skip-chars-forward "^ ")
 869                 (skip-chars-forward " ")
 870                 (setq crosses nil)
 871                 (while (looking-at "\\([^: \n]+\\):\\([0-9]+\\) +")
 872                   (push (cons (buffer-substring (match-beginning 1)
 873                                                 (match-end 1))
 874                               (buffer-substring (match-beginning 2)
 875                                                 (match-end 2)))
 876                         crosses)
 877                   (goto-char (match-end 0)))
 878                 (gnus-agent-crosspost crosses (caar pos))))
 879             (goto-char (point-min))
 880             (if (not (re-search-forward "^Message-ID: *<\\([^>\n]+\\)>" nil t))
 881                 (setq id "No-Message-ID-in-article")
 882               (setq id (buffer-substring (match-beginning 1) (match-end 1))))
 883             (let ((coding-system-for-write
 884                    gnus-agent-file-coding-system))
 885               (write-region (point-min) (point-max)
 886                             (concat dir (number-to-string (caar pos)))
 887                             nil 'silent))
 888             (when (setq elem (assq (caar pos) gnus-agent-article-alist))
 889               (setcdr elem t))
 890             (gnus-agent-enter-history
 891              id (or crosses (list (cons group (caar pos)))) date)
 892             (widen)
 893             (pop pos)))
 894         (gnus-agent-save-alist group)))))
 895
 896 (defun gnus-agent-crosspost (crosses article)
 897   (let (gnus-agent-article-alist group alist beg end)
 898     (save-excursion
 899       (set-buffer gnus-agent-overview-buffer)
 900       (when (nnheader-find-nov-line article)
 901         (forward-word 1)
 902         (setq beg (point))
 903         (setq end (progn (forward-line 1) (point)))))
 904     (while crosses
 905       (setq group (caar crosses))
 906       (unless (setq alist (assoc group gnus-agent-group-alist))
 907         (push (setq alist (list group (gnus-agent-load-alist (caar crosses))))
 908               gnus-agent-group-alist))
 909       (setcdr alist (cons (cons (cdar crosses) t) (cdr alist)))
 910       (save-excursion
 911         (set-buffer (gnus-get-buffer-create (format " *Gnus agent overview %s*"
 912                                                     group)))
 913         (when (= (point-max) (point-min))
 914           (push (cons group (current-buffer)) gnus-agent-buffer-alist)
 915           (ignore-errors
 916             (nnheader-insert-file-contents
 917              (gnus-agent-article-name ".overview" group))))
 918         (nnheader-find-nov-line (string-to-number (cdar crosses)))
 919         (insert (string-to-number (cdar crosses)))
 920         (insert-buffer-substring gnus-agent-overview-buffer beg end))
 921       (pop crosses))))
 922
 923 (defun gnus-agent-flush-cache ()
 924   (save-excursion
 925     (while gnus-agent-buffer-alist
 926       (set-buffer (cdar gnus-agent-buffer-alist))
 927       (let ((coding-system-for-write
 928              gnus-agent-file-coding-system))
 929         (write-region (point-min) (point-max)
 930                       (gnus-agent-article-name ".overview"
 931                                                (caar gnus-agent-buffer-alist))
 932                       nil 'silent))
 933       (pop gnus-agent-buffer-alist))
 934     (while gnus-agent-group-alist
 935       (with-temp-file (caar gnus-agent-group-alist)
 936         (princ (cdar gnus-agent-group-alist))
 937         (insert "\n"))
 938       (pop gnus-agent-group-alist))))
 939
 940 (if (fboundp 'union)
 941     (defalias 'gnus-agent-union 'union)
 942   (defun gnus-agent-union (l1 l2)
 943     "Set union of lists L1 and L2."
 944     (cond ((null l1) l2)
 945           ((null l2) l1)
 946           ((equal l1 l2) l1)
 947           (t
 948            (or (>= (length l1) (length l2))
 949                (setq l1 (prog1 l2 (setq l2 l1))))
 950            (while l2
 951              (or (memq (car l2) l1)
 952                  (push (car l2) l1))
 953              (pop l2))
 954            l1))))
 955
 956 (defun gnus-agent-fetch-headers (group &optional force)
 957   (let ((articles (gnus-list-of-unread-articles group))
 958         (gnus-decode-encoded-word-function 'identity)
 959         (file (gnus-agent-article-name ".overview" group)))
 960     ;; Add article with marks to list of article headers we want to fetch.
 961     (dolist (arts (gnus-info-marks (gnus-get-info group)))
 962       (setq articles (gnus-agent-union (gnus-uncompress-sequence (cdr arts))
 963                             articles)))
 964     (setq articles (sort articles '<))
 965     ;; Remove known articles.
 966     (when (gnus-agent-load-alist group)
 967       (setq articles (gnus-sorted-intersection
 968                       articles
 969                       (gnus-uncompress-range
 970                        (cons (1+ (caar (last gnus-agent-article-alist)))
 971                              (cdr (gnus-active group)))))))
 972     ;; Fetch them.
 973     (gnus-make-directory (nnheader-translate-file-chars
 974                           (file-name-directory file) t))
 975     (when articles
 976       (gnus-message 7 "Fetching headers for %s..." group)
 977       (save-excursion
 978         (set-buffer nntp-server-buffer)
 979         (unless (eq 'nov (gnus-retrieve-headers articles group))
 980           (nnvirtual-convert-headers))
 981         ;; Save these headers for later processing.
 982         (copy-to-buffer gnus-agent-overview-buffer (point-min) (point-max))
 983         (when (file-exists-p file)
 984           (gnus-agent-braid-nov group articles file))
 985         (let ((coding-system-for-write
 986                gnus-agent-file-coding-system))
 987           (write-region (point-min) (point-max) file nil 'silent))
 988         (gnus-agent-save-alist group articles nil)
 989         (gnus-agent-enter-history
 990          "last-header-fetched-for-session"
 991          (list (cons group (nth (- (length  articles) 1) articles)))
 992          (time-to-days (current-time)))
 993         articles))))
 994
 995 (defsubst gnus-agent-copy-nov-line (article)
 996   (let (b e)
 997     (set-buffer gnus-agent-overview-buffer)
 998     (setq b (point))
 999     (if (eq article (read (current-buffer)))
1000         (setq e (progn (forward-line 1) (point)))
1001       (progn
1002         (beginning-of-line)
1003         (setq e b)))
1004     (set-buffer nntp-server-buffer)
1005     (insert-buffer-substring gnus-agent-overview-buffer b e)))
1006
1007 (defun gnus-agent-braid-nov (group articles file)
1008   (set-buffer gnus-agent-overview-buffer)
1009   (goto-char (point-min))
1010   (set-buffer nntp-server-buffer)
1011   (erase-buffer)
1012   (nnheader-insert-file-contents file)
1013   (goto-char (point-max))
1014   (if (or (= (point-min) (point-max))
1015           (progn
1016             (forward-line -1)
1017             (< (read (current-buffer)) (car articles))))
1018       ;; We have only headers that are after the older headers,
1019       ;; so we just append them.
1020       (progn
1021         (goto-char (point-max))
1022         (insert-buffer-substring gnus-agent-overview-buffer))
1023     ;; We do it the hard way.
1024     (nnheader-find-nov-line (car articles))
1025     (gnus-agent-copy-nov-line (car articles))
1026     (pop articles)
1027     (while (and articles
1028                 (not (eobp)))
1029       (while (and (not (eobp))
1030                   (< (read (current-buffer)) (car articles)))
1031         (forward-line 1))
1032       (beginning-of-line)
1033       (unless (eobp)
1034         (gnus-agent-copy-nov-line (car articles))
1035         (setq articles (cdr articles))))
1036     (when articles
1037       (let (b e)
1038         (set-buffer gnus-agent-overview-buffer)
1039         (setq b (point)
1040               e (point-max))
1041         (set-buffer nntp-server-buffer)
1042         (insert-buffer-substring gnus-agent-overview-buffer b e)))))
1043
1044 (defun gnus-agent-load-alist (group &optional dir)
1045   "Load the article-state alist for GROUP."
1046   (setq gnus-agent-article-alist
1047         (gnus-agent-read-file
1048          (if dir
1049              (expand-file-name ".agentview" dir)
1050            (gnus-agent-article-name ".agentview" group)))))
1051
1052 (defun gnus-agent-save-alist (group &optional articles state dir)
1053   "Save the article-state alist for GROUP."
1054   (let ((file-name-coding-system nnmail-pathname-coding-system))
1055       (with-temp-file (if dir
1056                           (expand-file-name ".agentview" dir)
1057                         (gnus-agent-article-name ".agentview" group))
1058         (princ (setq gnus-agent-article-alist
1059                      (nconc gnus-agent-article-alist
1060                             (mapcar (lambda (article) (cons article state))
1061                                     articles)))
1062                (current-buffer))
1063         (insert "\n"))))
1064
1065 (defun gnus-agent-article-name (article group)
1066   (expand-file-name (if (stringp article) article (string-to-number article))
1067                     (file-name-as-directory
1068                      (expand-file-name (gnus-agent-group-path group)
1069                                        (gnus-agent-directory)))))
1070
1071 (defun gnus-agent-batch-confirmation (msg)
1072   "Show error message and return t."
1073   (gnus-message 1 msg)
1074   t)
1075
1076 ;;;###autoload
1077 (defun gnus-agent-batch-fetch ()
1078   "Start Gnus and fetch session."
1079   (interactive)
1080   (gnus)
1081   (let ((gnus-agent-confirmation-function 'gnus-agent-batch-confirmation))
1082     (gnus-agent-fetch-session))
1083   (gnus-group-exit))
1084
1085 (defun gnus-agent-fetch-session ()
1086   "Fetch all articles and headers that are eligible for fetching."
1087   (interactive)
1088   (unless gnus-agent-covered-methods
1089     (error "No servers are covered by the Gnus agent"))
1090   (unless gnus-plugged
1091     (error "Can't fetch articles while Gnus is unplugged"))
1092   (let ((methods gnus-agent-covered-methods)
1093         groups group gnus-command-method)
1094     (save-excursion
1095       (while methods
1096         (condition-case err
1097             (progn
1098               (setq gnus-command-method (car methods))
1099               (when (or (gnus-server-opened gnus-command-method)
1100                         (gnus-open-server gnus-command-method))
1101                 (setq groups (gnus-groups-from-server (car methods)))
1102                 (gnus-agent-with-fetch
1103                   (while (setq group (pop groups))
1104                     (when (<= (gnus-group-level group) gnus-agent-handle-level)
1105                       (gnus-agent-fetch-group-1 group gnus-command-method))))))
1106           (error
1107            (unless (funcall gnus-agent-confirmation-function
1108                             (format "Error (%s).  Continue? " err))
1109              (error "Cannot fetch articles into the Gnus agent")))
1110           (quit
1111            (unless (funcall gnus-agent-confirmation-function
1112                             (format "Quit (%s).  Continue? " err))
1113              (signal 'quit "Cannot fetch articles into the Gnus agent."))))
1114         (pop methods))
1115       (gnus-message 6 "Finished fetching articles into the Gnus agent"))))
1116
1117 (defun gnus-agent-fetch-group-1 (group method)
1118   "Fetch GROUP."
1119   (let ((gnus-command-method method)
1120         (gnus-newsgroup-name group)
1121         gnus-newsgroup-dependencies gnus-newsgroup-headers
1122         gnus-newsgroup-scored gnus-headers gnus-score
1123         gnus-use-cache articles arts
1124         category predicate info marks score-param
1125         (gnus-summary-expunge-below gnus-summary-expunge-below)
1126         (gnus-summary-mark-below gnus-summary-mark-below)
1127         (gnus-orphan-score gnus-orphan-score)
1128         ;; Maybe some other gnus-summary local variables should also
1129         ;; be put here.
1130         )
1131     (unless (gnus-check-group group)
1132       (error "Can't open server for %s" group))
1133     ;; Fetch headers.
1134     (when (and (or (gnus-active group) (gnus-activate-group group))
1135                (setq articles (gnus-agent-fetch-headers group))
1136                (let ((nntp-server-buffer gnus-agent-overview-buffer))
1137                  ;; Parse them and see which articles we want to fetch.
1138                  (setq gnus-newsgroup-dependencies
1139                        (make-vector (length articles) 0))
1140                  (setq gnus-newsgroup-headers
1141                        (gnus-get-newsgroup-headers-xover articles nil nil
1142                                                          group))
1143                  ;; `gnus-agent-overview-buffer' may be killed for
1144                  ;; timeout reason.  If so, recreate it.
1145                  (gnus-agent-create-buffer)))
1146       (setq category (gnus-group-category group))
1147       (setq predicate
1148             (gnus-get-predicate
1149              (or (gnus-group-find-parameter group 'agent-predicate t)
1150                  (cadr category))))
1151       (if (memq (caaddr predicate) '(gnus-agent-true gnus-agent-false))
1152           ;; Simple implementation
1153           (setq arts
1154                 (and (eq (caaddr predicate) 'gnus-agent-true) articles))
1155         (setq arts nil)
1156         (setq score-param
1157               (or (gnus-group-get-parameter group 'agent-score t)
1158                   (caddr category)))
1159         ;; Translate score-param into real one
1160         (cond
1161          ((not score-param))
1162          ((eq score-param 'file)
1163           (setq score-param (gnus-all-score-files group)))
1164          ((stringp (car score-param)))
1165          (t
1166           (setq score-param (list (list score-param)))))
1167         (when score-param
1168           (gnus-score-headers score-param))
1169         (while (setq gnus-headers (pop gnus-newsgroup-headers))
1170           (setq gnus-score
1171                 (or (cdr (assq (mail-header-number gnus-headers)
1172                                gnus-newsgroup-scored))
1173                     gnus-summary-default-score))
1174           (when (funcall predicate)
1175             (push (mail-header-number gnus-headers)
1176                   arts))))
1177       ;; Fetch the articles.
1178       (when arts
1179         (gnus-agent-fetch-articles group arts)))
1180     ;; Perhaps we have some additional articles to fetch.
1181     (setq arts (assq 'download (gnus-info-marks
1182                                 (setq info (gnus-get-info group)))))
1183     (when (cdr arts)
1184       (gnus-agent-fetch-articles
1185        group (gnus-uncompress-range (cdr arts)))
1186       (setq marks (delq arts (gnus-info-marks info)))
1187       (gnus-info-set-marks info marks)
1188       (gnus-dribble-enter
1189        (concat "(gnus-group-set-info '"
1190                (gnus-prin1-to-string info)
1191                ")")))))
1192
1193 ;;;
1194 ;;; Agent Category Mode
1195 ;;;
1196
1197 (defvar gnus-category-mode-hook nil
1198   "Hook run in `gnus-category-mode' buffers.")
1199
1200 (defvar gnus-category-line-format "     %(%20c%): %g\n"
1201   "Format of category lines.")
1202
1203 (defvar gnus-category-mode-line-format "Gnus: %%b"
1204   "The format specification for the category mode line.")
1205
1206 (defvar gnus-agent-short-article 100
1207   "Articles that have fewer lines than this are short.")
1208
1209 (defvar gnus-agent-long-article 200
1210   "Articles that have more lines than this are long.")
1211
1212 (defvar gnus-agent-low-score 0
1213   "Articles that have a score lower than this have a low score.")
1214
1215 (defvar gnus-agent-high-score 0
1216   "Articles that have a score higher than this have a high score.")
1217
1218
1219 ;;; Internal variables.
1220
1221 (defvar gnus-category-buffer "*Agent Category*")
1222
1223 (defvar gnus-category-line-format-alist
1224   `((?c gnus-tmp-name ?s)
1225     (?g gnus-tmp-groups ?d)))
1226
1227 (defvar gnus-category-mode-line-format-alist
1228   `((?u user-defined ?s)))
1229
1230 (defvar gnus-category-line-format-spec nil)
1231 (defvar gnus-category-mode-line-format-spec nil)
1232
1233 (defvar gnus-category-mode-map nil)
1234 (put 'gnus-category-mode 'mode-class 'special)
1235
1236 (unless gnus-category-mode-map
1237   (setq gnus-category-mode-map (make-sparse-keymap))
1238   (suppress-keymap gnus-category-mode-map)
1239
1240   (gnus-define-keys gnus-category-mode-map
1241     "q" gnus-category-exit
1242     "k" gnus-category-kill
1243     "c" gnus-category-copy
1244     "a" gnus-category-add
1245     "p" gnus-category-edit-predicate
1246     "g" gnus-category-edit-groups
1247     "s" gnus-category-edit-score
1248     "l" gnus-category-list
1249
1250     "\C-c\C-i" gnus-info-find-node
1251     "\C-c\C-b" gnus-bug))
1252
1253 (defvar gnus-category-menu-hook nil
1254   "*Hook run after the creation of the menu.")
1255
1256 (defun gnus-category-make-menu-bar ()
1257   (gnus-turn-off-edit-menu 'category)
1258   (unless (boundp 'gnus-category-menu)
1259     (easy-menu-define
1260      gnus-category-menu gnus-category-mode-map ""
1261      '("Categories"
1262        ["Add" gnus-category-add t]
1263        ["Kill" gnus-category-kill t]
1264        ["Copy" gnus-category-copy t]
1265        ["Edit predicate" gnus-category-edit-predicate t]
1266        ["Edit score" gnus-category-edit-score t]
1267        ["Edit groups" gnus-category-edit-groups t]
1268        ["Exit" gnus-category-exit t]))
1269
1270     (gnus-run-hooks 'gnus-category-menu-hook)))
1271
1272 (defun gnus-category-mode ()
1273   "Major mode for listing and editing agent categories.
1274
1275 All normal editing commands are switched off.
1276 \\<gnus-category-mode-map>
1277 For more in-depth information on this mode, read the manual
1278 (`\\[gnus-info-find-node]').
1279
1280 The following commands are available:
1281
1282 \\{gnus-category-mode-map}"
1283   (interactive)
1284   (when (gnus-visual-p 'category-menu 'menu)
1285     (gnus-category-make-menu-bar))
1286   (kill-all-local-variables)
1287   (gnus-simplify-mode-line)
1288   (setq major-mode 'gnus-category-mode)
1289   (setq mode-name "Category")
1290   (gnus-set-default-directory)
1291   (setq mode-line-process nil)
1292   (use-local-map gnus-category-mode-map)
1293   (buffer-disable-undo)
1294   (setq truncate-lines t)
1295   (setq buffer-read-only t)
1296   (gnus-run-hooks 'gnus-category-mode-hook))
1297
1298 (defalias 'gnus-category-position-point 'gnus-goto-colon)
1299
1300 (defun gnus-category-insert-line (category)
1301   (let* ((gnus-tmp-name (car category))
1302          (gnus-tmp-groups (length (cadddr category))))
1303     (beginning-of-line)
1304     (gnus-add-text-properties
1305      (point)
1306      (prog1 (1+ (point))
1307        ;; Insert the text.
1308        (eval gnus-category-line-format-spec))
1309      (list 'gnus-category gnus-tmp-name))))
1310
1311 (defun gnus-enter-category-buffer ()
1312   "Go to the Category buffer."
1313   (interactive)
1314   (gnus-category-setup-buffer)
1315   (gnus-configure-windows 'category)
1316   (gnus-category-prepare))
1317
1318 (defun gnus-category-setup-buffer ()
1319   (unless (get-buffer gnus-category-buffer)
1320     (save-excursion
1321       (set-buffer (gnus-get-buffer-create gnus-category-buffer))
1322       (gnus-category-mode))))
1323
1324 (defun gnus-category-prepare ()
1325   (gnus-set-format 'category-mode)
1326   (gnus-set-format 'category t)
1327   (let ((alist gnus-category-alist)
1328         (buffer-read-only nil))
1329     (erase-buffer)
1330     (while alist
1331       (gnus-category-insert-line (pop alist)))
1332     (goto-char (point-min))
1333     (gnus-category-position-point)))
1334
1335 (defun gnus-category-name ()
1336   (or (get-text-property (gnus-point-at-bol) 'gnus-category)
1337       (error "No category on the current line")))
1338
1339 (defun gnus-category-read ()
1340   "Read the category alist."
1341   (setq gnus-category-alist
1342         (or (gnus-agent-read-file
1343              (nnheader-concat gnus-agent-directory "lib/categories"))
1344             (list (list 'default 'short nil nil)))))
1345
1346 (defun gnus-category-write ()
1347   "Write the category alist."
1348   (setq gnus-category-predicate-cache nil
1349         gnus-category-group-cache nil)
1350   (gnus-make-directory (nnheader-concat gnus-agent-directory "lib"))
1351   (with-temp-file (nnheader-concat gnus-agent-directory "lib/categories")
1352     (prin1 gnus-category-alist (current-buffer))))
1353
1354 (defun gnus-category-edit-predicate (category)
1355   "Edit the predicate for CATEGORY."
1356   (interactive (list (gnus-category-name)))
1357   (let ((info (assq category gnus-category-alist)))
1358     (gnus-edit-form
1359      (cadr info) (format "Editing the predicate for category %s" category)
1360      `(lambda (predicate)
1361         (setcar (cdr (assq ',category gnus-category-alist)) predicate)
1362         (gnus-category-write)
1363         (gnus-category-list)))))
1364
1365 (defun gnus-category-edit-score (category)
1366   "Edit the score expression for CATEGORY."
1367   (interactive (list (gnus-category-name)))
1368   (let ((info (assq category gnus-category-alist)))
1369     (gnus-edit-form
1370      (caddr info)
1371      (format "Editing the score expression for category %s" category)
1372      `(lambda (groups)
1373         (setcar (cddr (assq ',category gnus-category-alist)) groups)
1374         (gnus-category-write)
1375         (gnus-category-list)))))
1376
1377 (defun gnus-category-edit-groups (category)
1378   "Edit the group list for CATEGORY."
1379   (interactive (list (gnus-category-name)))
1380   (let ((info (assq category gnus-category-alist)))
1381     (gnus-edit-form
1382      (cadddr info) (format "Editing the group list for category %s" category)
1383      `(lambda (groups)
1384         (setcar (nthcdr 3 (assq ',category gnus-category-alist)) groups)
1385         (gnus-category-write)
1386         (gnus-category-list)))))
1387
1388 (defun gnus-category-kill (category)
1389   "Kill the current category."
1390   (interactive (list (gnus-category-name)))
1391   (let ((info (assq category gnus-category-alist))
1392         (buffer-read-only nil))
1393     (gnus-delete-line)
1394     (setq gnus-category-alist (delq info gnus-category-alist))
1395     (gnus-category-write)))
1396
1397 (defun gnus-category-copy (category to)
1398   "Copy the current category."
1399   (interactive (list (gnus-category-name) (intern (read-string "New name: "))))
1400   (let ((info (assq category gnus-category-alist)))
1401     (push (list to (gnus-copy-sequence (cadr info))
1402                 (gnus-copy-sequence (caddr info)) nil)
1403           gnus-category-alist)
1404     (gnus-category-write)
1405     (gnus-category-list)))
1406
1407 (defun gnus-category-add (category)
1408   "Create a new category."
1409   (interactive "SCategory name: ")
1410   (when (assq category gnus-category-alist)
1411     (error "Category %s already exists" category))
1412   (push (list category 'false nil nil)
1413         gnus-category-alist)
1414   (gnus-category-write)
1415   (gnus-category-list))
1416
1417 (defun gnus-category-list ()
1418   "List all categories."
1419   (interactive)
1420   (gnus-category-prepare))
1421
1422 (defun gnus-category-exit ()
1423   "Return to the group buffer."
1424   (interactive)
1425   (kill-buffer (current-buffer))
1426   (gnus-configure-windows 'group t))
1427
1428 ;; To avoid having 8-bit characters in the source file.
1429 (defvar gnus-category-not (list '! 'not (intern (format "%c" 172))))
1430
1431 (defvar gnus-category-predicate-alist
1432   '((spam . gnus-agent-spam-p)
1433     (short . gnus-agent-short-p)
1434     (long . gnus-agent-long-p)
1435     (low . gnus-agent-low-scored-p)
1436     (high . gnus-agent-high-scored-p)
1437     (true . gnus-agent-true)
1438     (false . gnus-agent-false))
1439   "Mapping from short score predicate symbols to predicate functions.")
1440
1441 (defun gnus-agent-spam-p ()
1442   "Say whether an article is spam or not."
1443   (unless gnus-agent-spam-hashtb
1444     (setq gnus-agent-spam-hashtb (gnus-make-hashtable 1000)))
1445   (if (not (equal (mail-header-references gnus-headers) ""))
1446       nil
1447     (let ((string (gnus-simplify-subject (mail-header-subject gnus-headers))))
1448       (prog1
1449           (gnus-gethash string gnus-agent-spam-hashtb)
1450         (gnus-sethash string t gnus-agent-spam-hashtb)))))
1451
1452 (defun gnus-agent-short-p ()
1453   "Say whether an article is short or not."
1454   (< (mail-header-lines gnus-headers) gnus-agent-short-article))
1455
1456 (defun gnus-agent-long-p ()
1457   "Say whether an article is long or not."
1458   (> (mail-header-lines gnus-headers) gnus-agent-long-article))
1459
1460 (defun gnus-agent-low-scored-p ()
1461   "Say whether an article has a low score or not."
1462   (< gnus-score gnus-agent-low-score))
1463
1464 (defun gnus-agent-high-scored-p ()
1465   "Say whether an article has a high score or not."
1466   (> gnus-score gnus-agent-high-score))
1467
1468 (defun gnus-category-make-function (cat)
1469   "Make a function from category CAT."
1470   `(lambda () ,(gnus-category-make-function-1 cat)))
1471
1472 (defun gnus-agent-true ()
1473   "Return t."
1474   t)
1475
1476 (defun gnus-agent-false ()
1477   "Return nil."
1478   nil)
1479
1480 (defun gnus-category-make-function-1 (cat)
1481   "Make a function from category CAT."
1482   (cond
1483    ;; Functions are just returned as is.
1484    ((or (symbolp cat)
1485         (gnus-functionp cat))
1486     `(,(or (cdr (assq cat gnus-category-predicate-alist))
1487            cat)))
1488    ;; More complex category.
1489    ((consp cat)
1490     `(,(cond
1491         ((memq (car cat) '(& and))
1492          'and)
1493         ((memq (car cat) '(| or))
1494          'or)
1495         ((memq (car cat) gnus-category-not)
1496          'not))
1497       ,@(mapcar 'gnus-category-make-function-1 (cdr cat))))
1498    (t
1499     (error "Unknown category type: %s" cat))))
1500
1501 (defun gnus-get-predicate (predicate)
1502   "Return the predicate for CATEGORY."
1503   (or (cdr (assoc predicate gnus-category-predicate-cache))
1504       (cdar (push (cons predicate
1505                         (gnus-category-make-function predicate))
1506                   gnus-category-predicate-cache))))
1507
1508 (defun gnus-group-category (group)
1509   "Return the category GROUP belongs to."
1510   (unless gnus-category-group-cache
1511     (setq gnus-category-group-cache (gnus-make-hashtable 1000))
1512     (let ((cs gnus-category-alist)
1513           groups cat)
1514       (while (setq cat (pop cs))
1515         (setq groups (cadddr cat))
1516         (while groups
1517           (gnus-sethash (pop groups) cat gnus-category-group-cache)))))
1518   (or (gnus-gethash group gnus-category-group-cache)
1519       (assq 'default gnus-category-alist)))
1520
1521 (defun gnus-agent-expire ()
1522   "Expire all old articles."
1523   (interactive)
1524   (let ((methods gnus-agent-covered-methods)
1525         (day (- (time-to-days (current-time)) gnus-agent-expire-days))
1526         gnus-command-method sym group articles
1527         history overview file histories elem art nov-file low info
1528         unreads marked article orig lowest highest)
1529     (save-excursion
1530       (setq overview (gnus-get-buffer-create " *expire overview*"))
1531       (while (setq gnus-command-method (pop methods))
1532         (when (file-exists-p (gnus-agent-lib-file "active"))
1533           (with-temp-buffer
1534             (nnheader-insert-file-contents (gnus-agent-lib-file "active"))
1535             (gnus-active-to-gnus-format
1536              gnus-command-method
1537              (setq orig (gnus-make-hashtable
1538                          (count-lines (point-min) (point-max))))))
1539           (let ((expiry-hashtb (gnus-make-hashtable 1023)))
1540             (gnus-agent-open-history)
1541             (set-buffer
1542              (setq gnus-agent-current-history
1543                    (setq history (gnus-agent-history-buffer))))
1544             (goto-char (point-min))
1545             (when (> (buffer-size) 1)
1546               (goto-char (point-min))
1547               (while (not (eobp))
1548                 (skip-chars-forward "^\t")
1549                 (if (> (read (current-buffer)) day)
1550                     ;; New article; we don't expire it.
1551                     (forward-line 1)
1552                   ;; Old article.  Schedule it for possible nuking.
1553                   (while (not (eolp))
1554                     (setq sym (let ((obarray expiry-hashtb) s)
1555                                 (setq s (read (current-buffer)))
1556                                 (if (stringp s) (intern s) s)))
1557                     (if (boundp sym)
1558                         (set sym (cons (cons (read (current-buffer)) (point))
1559                                        (symbol-value sym)))
1560                       (set sym (list (cons (read (current-buffer)) (point)))))
1561                     (skip-chars-forward " "))
1562                   (forward-line 1)))
1563               ;; We now have all articles that can possibly be expired.
1564               (mapatoms
1565                (lambda (sym)
1566                  (setq group (symbol-name sym)
1567                        articles (sort (symbol-value sym) 'car-less-than-car)
1568                        low (car (gnus-active group))
1569                        info (gnus-get-info group)
1570                        unreads (ignore-errors
1571                                  (gnus-list-of-unread-articles group))
1572                        marked (nconc
1573                                (gnus-uncompress-range
1574                                 (cdr (assq 'tick (gnus-info-marks info))))
1575                                (gnus-uncompress-range
1576                                 (cdr (assq 'dormant
1577                                            (gnus-info-marks info)))))
1578                        nov-file (gnus-agent-article-name ".overview" group)
1579                        lowest nil
1580                        highest nil)
1581                  (gnus-agent-load-alist group)
1582                  (gnus-message 5 "Expiring articles in %s" group)
1583                  (set-buffer overview)
1584                  (erase-buffer)
1585                  (when (file-exists-p nov-file)
1586                    (nnheader-insert-file-contents nov-file))
1587                  (goto-char (point-min))
1588                  (setq article 0)
1589                  (while (setq elem (pop articles))
1590                    (setq article (car elem))
1591                    (when (or (null low)
1592                              (< article low)
1593                              gnus-agent-expire-all
1594                              (and (not (memq article unreads))
1595                                   (not (memq article marked))))
1596                      ;; Find and nuke the NOV line.
1597                      (while (and (not (eobp))
1598                                  (or (not (numberp
1599                                            (setq art (read (current-buffer)))))
1600                                      (< art article)))
1601                        (if (and (numberp art)
1602                                 (file-exists-p
1603                                  (gnus-agent-article-name
1604                                   (number-to-string art) group)))
1605                            (progn
1606                              (unless lowest
1607                                (setq lowest art))
1608                              (setq highest art)
1609                              (forward-line 1))
1610                          ;; Remove old NOV lines that have no articles.
1611                          (gnus-delete-line)))
1612                      (if (or (eobp)
1613                              (/= art article))
1614                          (beginning-of-line)
1615                        (gnus-delete-line))
1616                      ;; Nuke the article.
1617                      (when (file-exists-p
1618                             (setq file (gnus-agent-article-name
1619                                         (number-to-string article)
1620                                         group)))
1621                        (delete-file file))
1622                      ;; Schedule the history line for nuking.
1623                      (push (cdr elem) histories)))
1624                  (gnus-make-directory (file-name-directory nov-file))
1625                  (let ((coding-system-for-write
1626                         gnus-agent-file-coding-system))
1627                    (write-region (point-min) (point-max) nov-file nil 'silent))
1628                  ;; Delete the unwanted entries in the alist.
1629                  (setq gnus-agent-article-alist
1630                        (sort gnus-agent-article-alist 'car-less-than-car))
1631                  (let* ((alist gnus-agent-article-alist)
1632                         (prev (cons nil alist))
1633                         (first prev)
1634                         expired)
1635                    (while (and alist
1636                                (<= (caar alist) article))
1637                      (if (or (not (cdar alist))
1638                              (not (file-exists-p
1639                                    (gnus-agent-article-name
1640                                     (number-to-string
1641                                      (caar alist))
1642                                     group))))
1643                          (progn
1644                            (push (caar alist) expired)
1645                            (setcdr prev (setq alist (cdr alist))))
1646                        (setq prev alist
1647                              alist (cdr alist))))
1648                    (setq gnus-agent-article-alist (cdr first))
1649                    (gnus-agent-save-alist group)
1650                    ;; Mark all articles up to the first article
1651                    ;; in `gnus-article-alist' as read.
1652                    (when (and info (caar gnus-agent-article-alist))
1653                      (setcar (nthcdr 2 info)
1654                              (gnus-range-add
1655                               (nth 2 info)
1656                               (cons 1 (- (caar gnus-agent-article-alist) 1)))))
1657                    ;; Maybe everything has been expired from `gnus-article-alist'
1658                    ;; and so the above marking as read could not be conducted,
1659                    ;; or there are expired article within the range of the alist.
1660                    (when (and info
1661                               expired
1662                               (or (not (caar gnus-agent-article-alist))
1663                                   (> (car expired)
1664                                      (caar gnus-agent-article-alist))))
1665                      (setcar (nthcdr 2 info)
1666                              (gnus-add-to-range
1667                               (nth 2 info)
1668                               (nreverse expired))))
1669                    (gnus-dribble-enter
1670                     (concat "(gnus-group-set-info '"
1671                             (gnus-prin1-to-string info)
1672                             ")")))
1673                  (when lowest
1674                    (if (gnus-gethash group orig)
1675                        (setcar (gnus-gethash group orig) lowest)
1676                      (gnus-sethash group (cons lowest highest) orig))))
1677                expiry-hashtb)
1678               (set-buffer history)
1679               (setq histories (nreverse (sort histories '<)))
1680               (while histories
1681                 (goto-char (pop histories))
1682                 (gnus-delete-line))
1683               (gnus-agent-save-history)
1684               (gnus-agent-close-history)
1685               (gnus-write-active-file
1686                (gnus-agent-lib-file "active") orig))
1687             (gnus-message 4 "Expiry...done")))))))
1688
1689 ;;;###autoload
1690 (defun gnus-agent-batch ()
1691   (interactive)
1692   (let ((init-file-user "")
1693         (gnus-always-read-dribble-file t))
1694     (gnus))
1695   (gnus-group-send-drafts)
1696   (gnus-agent-fetch-session))
1697
1698 (provide 'gnus-agent)
1699
1700 ;;; gnus-agent.el ends here