lisp/nnfolder.el

   1 ;;; nnfolder.el --- mail folder access for Gnus
   2 ;; Copyright (C) 1995 Free Software Foundation, Inc.
   3
   4 ;; Author: Scott Byer <byer@mv.us.adobe.com>
   5 ;;      Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
   6 ;;      Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
   7 ;; Keywords: news, mail
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 2, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to
  23 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  24
  25 ;;; Commentary:
  26
  27 ;; For an overview of what the interface functions do, please see the
  28 ;; Gnus sources.
  29
  30 ;; Various enhancements by byer@mv.us.adobe.com (Scott Byer).
  31
  32 ;;; Code:
  33
  34 (require 'nnheader)
  35 (require 'rmail)
  36 (require 'nnmail)
  37
  38 (defvar nnfolder-directory (expand-file-name "~/Mail/")
  39   "The name of the mail box file in the users home directory.")
  40
  41 (defvar nnfolder-active-file
  42   (concat (file-name-as-directory nnfolder-directory) "active")
  43   "The name of the active file.")
  44
  45 ;; I renamed this variable to somehting more in keeping with the general GNU
  46 ;; style. -SLB
  47
  48 (defvar nnfolder-ignore-active-file nil
  49   "If non-nil, causes nnfolder to do some extra work in order to determine the true active ranges of an mbox file.
  50 Note that the active file is still saved, but it's values are not
  51 used.  This costs some extra time when scanning an mbox when opening
  52 it.")
  53
  54 ;; Note that this variable may not be completely implemented yet. -SLB
  55
  56 (defvar nnfolder-always-close nil
  57   "If non-nil, nnfolder attempts to only ever have one mbox open at a time.
  58 This is a straight space/performance trade off, as the mboxes will have to
  59 be scanned every time they are read in.  If nil (default), nnfolder will
  60 attempt to keep the buffers around (saving the nnfolder's buffer upon group
  61 close, but not killing it), speeding some things up tremendously, especially
  62 such things as moving mail.  All buffers always get killed upon server close.")
  63
  64 (defvar nnfolder-newsgroups-file
  65   (concat (file-name-as-directory  nnfolder-directory) "newsgroups")
  66   "Mail newsgroups description file.")
  67
  68 (defvar nnfolder-get-new-mail t
  69   "If non-nil, nnfolder will check the incoming mail file and split the mail.")
  70
  71 (defvar nnfolder-prepare-save-mail-hook nil
  72   "Hook run narrowed to an article before saving.")
  73
  74 \f
  75
  76 (defconst nnfolder-version "nnfolder 1.0"
  77   "nnfolder version.")
  78
  79 (defconst nnfolder-article-marker "X-Gnus-Article-Number: "
  80   "String used to demarcate what the article number for a message is.")
  81
  82 (defvar nnfolder-current-group nil)
  83 (defvar nnfolder-current-buffer nil)
  84 (defvar nnfolder-status-string "")
  85 (defvar nnfolder-group-alist nil)
  86 (defvar nnfolder-buffer-alist nil)
  87 (defvar nnfolder-active-timestamp nil)
  88
  89 (defmacro nnfolder-article-string (article)
  90   (` (concat "\n" nnfolder-article-marker (int-to-string (, article)) " ")))
  91
  92 \f
  93
  94 (defvar nnfolder-current-server nil)
  95 (defvar nnfolder-server-alist nil)
  96 (defvar nnfolder-server-variables
  97   (list
  98    (list 'nnfolder-directory nnfolder-directory)
  99    (list 'nnfolder-active-file nnfolder-active-file)
 100    (list 'nnfolder-newsgroups-file nnfolder-newsgroups-file)
 101    (list 'nnfolder-get-new-mail nnfolder-get-new-mail)
 102    '(nnfolder-current-group nil)
 103    '(nnfolder-current-buffer nil)
 104    '(nnfolder-status-string "")
 105    '(nnfolder-group-alist nil)
 106    '(nnfolder-buffer-alist nil)
 107    '(nnfolder-active-timestamp nil)))
 108
 109 \f
 110
 111 ;;; Interface functions
 112
 113 (defun nnfolder-retrieve-headers (sequence &optional newsgroup server)
 114   (save-excursion
 115     (set-buffer nntp-server-buffer)
 116     (erase-buffer)
 117     (let ((delim-string (concat "^" rmail-unix-mail-delimiter))
 118           article art-string start stop)
 119       (nnfolder-possibly-change-group newsgroup)
 120       (set-buffer nnfolder-current-buffer)
 121       (goto-char (point-min))
 122       (if (stringp (car sequence))
 123           'headers
 124         (while sequence
 125           (setq article (car sequence))
 126           (setq art-string (nnfolder-article-string article))
 127           (set-buffer nnfolder-current-buffer)
 128           (if (or (search-forward art-string nil t)
 129                   ;; Don't search the whole file twice!  Also, articles
 130                   ;; probably have some locality by number, so searching
 131                   ;; backwards will be faster.  Especially if we're at the
 132                   ;; beginning of the buffer :-). -SLB
 133                   (search-backward art-string nil t))
 134               (progn
 135                 (setq start (or (re-search-backward delim-string nil t)
 136                                 (point)))
 137                 (search-forward "\n\n" nil t)
 138                 (setq stop (1- (point)))
 139                 (set-buffer nntp-server-buffer)
 140                 (insert (format "221 %d Article retrieved.\n" article))
 141                 (insert-buffer-substring nnfolder-current-buffer start stop)
 142                 (goto-char (point-max))
 143                 (insert ".\n")))
 144           (setq sequence (cdr sequence)))
 145
 146         ;; Fold continuation lines.
 147         (set-buffer nntp-server-buffer)
 148         (goto-char (point-min))
 149         (while (re-search-forward "\\(\r?\n[ \t]+\\)+" nil t)
 150           (replace-match " " t t))
 151         'headers))))
 152
 153 (defun nnfolder-open-server (server &optional defs)
 154   (nnheader-init-server-buffer)
 155   (if (equal server nnfolder-current-server)
 156       t
 157     (if nnfolder-current-server
 158         (setq nnfolder-server-alist
 159               (cons (list nnfolder-current-server
 160                           (nnheader-save-variables nnfolder-server-variables))
 161                     nnfolder-server-alist)))
 162     (let ((state (assoc server nnfolder-server-alist)))
 163       (if state
 164           (progn
 165             (nnheader-restore-variables (nth 1 state))
 166             (setq nnfolder-server-alist (delq state nnfolder-server-alist)))
 167         (nnheader-set-init-variables nnfolder-server-variables defs)))
 168     (setq nnfolder-current-server server)))
 169
 170 (defun nnfolder-close-server (&optional server)
 171   t)
 172
 173 (defun nnfolder-server-opened (&optional server)
 174   (and (equal server nnfolder-current-server)
 175        nntp-server-buffer
 176        (buffer-name nntp-server-buffer)))
 177
 178 (defun nnfolder-request-close ()
 179   (let ((alist nnfolder-buffer-alist))
 180     (while alist
 181       (nnfolder-close-group (car (car alist)) nil t)
 182       (setq alist (cdr alist))))
 183   (setq nnfolder-buffer-alist nil
 184         nnfolder-group-alist nil))
 185
 186 (defun nnfolder-status-message (&optional server)
 187   nnfolder-status-string)
 188
 189 (defun nnfolder-request-article (article &optional newsgroup server buffer)
 190   (nnfolder-possibly-change-group newsgroup)
 191   (if (stringp article)
 192       nil
 193     (save-excursion
 194       (set-buffer nnfolder-current-buffer)
 195       (goto-char (point-min))
 196       (if (search-forward (nnfolder-article-string article) nil t)
 197           (let (start stop)
 198             (re-search-backward (concat "^" rmail-unix-mail-delimiter) nil t)
 199             (setq start (point))
 200             (forward-line 1)
 201             (or (and (re-search-forward
 202                       (concat "^" rmail-unix-mail-delimiter) nil t)
 203                      (forward-line -1))
 204                 (goto-char (point-max)))
 205             (setq stop (point))
 206             (let ((nntp-server-buffer (or buffer nntp-server-buffer)))
 207               (set-buffer nntp-server-buffer)
 208               (erase-buffer)
 209               (insert-buffer-substring nnfolder-current-buffer start stop)
 210               (goto-char (point-min))
 211               (while (looking-at "From ")
 212                 (delete-char 5)
 213                 (insert "X-From-Line: ")
 214                 (forward-line 1))
 215               t))))))
 216
 217 (defun nnfolder-request-group (group &optional server dont-check)
 218   (save-excursion
 219     (nnmail-activate 'nnfolder)
 220     (nnfolder-possibly-change-group group)
 221     (and (assoc group nnfolder-group-alist)
 222          (progn
 223            (if dont-check
 224                t
 225              (nnfolder-get-new-mail group)
 226              (let* ((active (assoc group nnfolder-group-alist))
 227                     (group (car active))
 228                     (range (car (cdr active)))
 229                     (minactive (car range))
 230                     (maxactive (cdr range)))
 231                ;; I've been getting stray 211 lines in my nnfolder active
 232                ;; file.  So, let's make sure that doesn't happen. -SLB
 233                (set-buffer nntp-server-buffer)
 234                (erase-buffer)
 235                (if (not active)
 236                    ()
 237                  (insert (format "211 %d %d %d %s\n"
 238                                  (1+ (- maxactive minactive))
 239                                  minactive maxactive group))
 240                  t)))))))
 241
 242 ;; Don't close the buffer if we're not shutting down the server.  This way,
 243 ;; we can keep the buffer in the group buffer cache, and not have to grovel
 244 ;; over the buffer again unless we add new mail to it or modify it in some
 245 ;; way.
 246
 247 (defun nnfolder-close-group (group &optional server force)
 248   ;; Make sure we _had_ the group open.
 249   (if (or (assoc group nnfolder-buffer-alist)
 250           (equal group nnfolder-current-group))
 251       (progn
 252         (nnfolder-possibly-change-group group)
 253         (save-excursion
 254           (set-buffer nnfolder-current-buffer)
 255           ;; If the buffer was modified, write the file out now.
 256           (and (buffer-modified-p) (save-buffer))
 257           (if (or force
 258                   nnfolder-always-close)
 259               ;; If we're shutting the server down, we need to kill the
 260               ;; buffer and remove it from the open buffer list.  Or, of
 261               ;; course, if we're trying to minimize our space impact.
 262               (progn
 263                 (kill-buffer (current-buffer))
 264                 (setq nnfolder-buffer-alist (delq (assoc group
 265                                                          nnfolder-buffer-alist)
 266                                                   nnfolder-buffer-alist)))))))
 267   (setq nnfolder-current-group nil
 268         nnfolder-current-buffer nil)
 269   t)
 270
 271 (defun nnfolder-request-create-group (group &optional server)
 272   (nnmail-activate 'nnfolder)
 273   (or (assoc group nnfolder-group-alist)
 274       (let (active)
 275         (setq nnfolder-group-alist
 276               (cons (list group (setq active (cons 1 0)))
 277                     nnfolder-group-alist))
 278         (nnmail-save-active nnfolder-group-alist nnfolder-active-file)))
 279   t)
 280
 281 (defun nnfolder-request-list (&optional server)
 282   (if server (nnfolder-get-new-mail))
 283   (save-excursion
 284     (nnmail-find-file nnfolder-active-file)
 285     (setq nnfolder-group-alist (nnmail-get-active))))
 286
 287 (defun nnfolder-request-newgroups (date &optional server)
 288   (nnfolder-request-list server))
 289
 290 (defun nnfolder-request-list-newsgroups (&optional server)
 291   (save-excursion
 292     (nnmail-find-file nnfolder-newsgroups-file)))
 293
 294 (defun nnfolder-request-post (&optional server)
 295   (mail-send-and-exit nil))
 296
 297 (defalias 'nnfolder-request-post-buffer 'nnmail-request-post-buffer)
 298
 299 (defun nnfolder-request-expire-articles
 300   (articles newsgroup &optional server force)
 301   (nnfolder-possibly-change-group newsgroup)
 302   (let* ((days (or (and nnmail-expiry-wait-function
 303                         (funcall nnmail-expiry-wait-function newsgroup))
 304                    nnmail-expiry-wait))
 305          (is-old t)
 306          rest)
 307     (nnmail-activate 'nnfolder)
 308
 309     (save-excursion
 310       (set-buffer nnfolder-current-buffer)
 311       (while (and articles is-old)
 312         (goto-char (point-min))
 313         (if (search-forward (nnfolder-article-string (car articles)) nil t)
 314             (if (or force
 315                     (setq is-old
 316                           (> (nnmail-days-between
 317                               (current-time-string)
 318                               (buffer-substring
 319                                (point) (progn (end-of-line) (point))))
 320                              days)))
 321                 (progn
 322                   (and gnus-verbose-backends
 323                        (message "Deleting article %s..." (car articles)))
 324                   (nnfolder-delete-mail))
 325               (setq rest (cons (car articles) rest))))
 326         (setq articles (cdr articles)))
 327       (and (buffer-modified-p) (save-buffer))
 328       ;; Find the lowest active article in this group.
 329       (let* ((active (car (cdr (assoc newsgroup nnfolder-group-alist))))
 330              (marker (concat "\n" nnfolder-article-marker))
 331              (number "[0-9]+")
 332              (activemin (cdr active)))
 333         (goto-char (point-min))
 334         (while (and (search-forward marker nil t)
 335                     (re-search-forward number nil t))
 336           (setq activemin (min activemin
 337                                (string-to-number (buffer-substring
 338                                                   (match-beginning 0)
 339                                                   (match-end 0))))))
 340         (setcar active activemin))
 341       (nnmail-save-active nnfolder-group-alist nnfolder-active-file)
 342       (nconc rest articles))))
 343
 344 (defun nnfolder-request-move-article
 345   (article group server accept-form &optional last)
 346   (nnfolder-possibly-change-group group)
 347   (let ((buf (get-buffer-create " *nnfolder move*"))
 348         result)
 349     (and
 350      (nnfolder-request-article article group server)
 351      (save-excursion
 352        (set-buffer buf)
 353        (buffer-disable-undo (current-buffer))
 354        (erase-buffer)
 355        (insert-buffer-substring nntp-server-buffer)
 356        (goto-char (point-min))
 357        (while (re-search-forward
 358                (concat "^" nnfolder-article-marker)
 359                (save-excursion (search-forward "\n\n" nil t) (point)) t)
 360          (delete-region (progn (beginning-of-line) (point))
 361                         (progn (forward-line 1) (point))))
 362        (setq result (eval accept-form))
 363        (kill-buffer buf)
 364        result)
 365      (save-excursion
 366        (nnfolder-possibly-change-group group)
 367        (set-buffer nnfolder-current-buffer)
 368        (goto-char (point-min))
 369        (if (search-forward (nnfolder-article-string article) nil t)
 370            (nnfolder-delete-mail))
 371        (and last
 372             (buffer-modified-p)
 373             (save-buffer))))
 374     result))
 375
 376 (defun nnfolder-request-accept-article (group &optional last)
 377   (and (stringp group) (nnfolder-possibly-change-group group))
 378   (let ((buf (current-buffer))
 379         result)
 380     (goto-char (point-min))
 381     (cond ((looking-at "X-From-Line: ")
 382            (replace-match "From "))
 383           ((not (looking-at "From "))
 384            (insert "From nobody " (current-time-string) "\n")))
 385     (and
 386      (nnfolder-request-list)
 387      (save-excursion
 388        (set-buffer buf)
 389        (goto-char (point-min))
 390        (search-forward "\n\n" nil t)
 391        (forward-line -1)
 392        (while (re-search-backward (concat "^" nnfolder-article-marker) nil t)
 393          (delete-region (point) (progn (forward-line 1) (point))))
 394        (setq result (car (nnfolder-save-mail (and (stringp group) group)))))
 395      (save-excursion
 396        (set-buffer nnfolder-current-buffer)
 397        (and last (buffer-modified-p) (save-buffer))))
 398     (nnmail-save-active nnfolder-group-alist nnfolder-active-file)
 399     result))
 400
 401 (defun nnfolder-request-replace-article (article group buffer)
 402   (nnfolder-possibly-change-group group)
 403   (save-excursion
 404     (set-buffer nnfolder-current-buffer)
 405     (goto-char (point-min))
 406     (if (not (search-forward (nnfolder-article-string article) nil t))
 407         nil
 408       (nnfolder-delete-mail t t)
 409       (insert-buffer-substring buffer)
 410       (and (buffer-modified-p) (save-buffer))
 411       t)))
 412
 413 \f
 414 ;;; Internal functions.
 415
 416 (defun nnfolder-delete-mail (&optional force leave-delim)
 417   ;; Beginning of the article.
 418   (save-excursion
 419     (save-restriction
 420       (narrow-to-region
 421        (save-excursion
 422          (re-search-backward (concat "^" rmail-unix-mail-delimiter) nil t)
 423          (if leave-delim (progn (forward-line 1) (point))
 424            (match-beginning 0)))
 425        (progn
 426          (forward-line 1)
 427          (or (and (re-search-forward (concat "^" rmail-unix-mail-delimiter)
 428                                      nil t)
 429                   (if (and (not (bobp)) leave-delim)
 430                       (progn (forward-line -2) (point))
 431                     (match-beginning 0)))
 432              (point-max))))
 433       (delete-region (point-min) (point-max)))))
 434
 435 (defun nnfolder-possibly-change-group (group)
 436   (or (file-exists-p nnfolder-directory)
 437       (make-directory (directory-file-name nnfolder-directory)))
 438   (nnfolder-possibly-activate-groups nil)
 439   (or (assoc group nnfolder-group-alist)
 440       (not (file-exists-p (concat (file-name-as-directory nnfolder-directory)
 441                                   group)))
 442       (progn
 443         (setq nnfolder-group-alist
 444               (cons (list group (cons 1 0)) nnfolder-group-alist))
 445         (nnmail-save-active nnfolder-group-alist nnfolder-active-file)))
 446   (let (inf file)
 447     (if (and (equal group nnfolder-current-group)
 448              nnfolder-current-buffer
 449              (buffer-name nnfolder-current-buffer))
 450         ()
 451       (setq nnfolder-current-group group)
 452
 453       ;; If we have to change groups, see if we don't already have the mbox
 454       ;; in memory.  If we do, verify the modtime and destroy the mbox if
 455       ;; needed so we can rescan it.
 456       (if (setq inf (assoc group nnfolder-buffer-alist))
 457           (setq nnfolder-current-buffer (nth 1 inf)))
 458
 459       ;; If the buffer is not live, make sure it isn't in the alist.  If it
 460       ;; is live, verify that nobody else has touched the file since last
 461       ;; time.
 462       (if (or (not (and nnfolder-current-buffer
 463                         (buffer-name nnfolder-current-buffer)))
 464               (not (and (bufferp nnfolder-current-buffer)
 465                         (verify-visited-file-modtime
 466                          nnfolder-current-buffer))))
 467           (progn
 468             (if (and nnfolder-current-buffer
 469                      (buffer-name nnfolder-current-buffer)
 470                      (bufferp nnfolder-current-buffer))
 471                 (kill-buffer nnfolder-current-buffer))
 472             (setq nnfolder-buffer-alist (delq inf nnfolder-buffer-alist))
 473             (setq inf nil)))
 474
 475       (if inf
 476           ()
 477         (save-excursion
 478           (setq file (concat (file-name-as-directory nnfolder-directory)
 479                              group))
 480           (if (file-directory-p (file-truename file))
 481               ()
 482             (if (not (file-exists-p file))
 483                 (write-region 1 1 file t 'nomesg))
 484             (setq nnfolder-current-buffer
 485                   (set-buffer (nnfolder-read-folder file)))
 486             (setq nnfolder-buffer-alist (cons (list group (current-buffer))
 487                                               nnfolder-buffer-alist)))))))
 488   (setq nnfolder-current-group group))
 489
 490 (defun nnfolder-save-mail (&optional group)
 491   "Called narrowed to an article."
 492   (let* ((nnmail-split-methods
 493           (if group (list (list group "")) nnmail-split-methods))
 494          (group-art-list
 495           (nreverse (nnmail-article-group 'nnfolder-active-number)))
 496          save-list group-art)
 497     (setq save-list group-art-list)
 498     (nnmail-insert-lines)
 499     (nnmail-insert-xref group-art-list)
 500     (run-hooks 'nnfolder-prepare-save-mail-hook)
 501
 502     ;; Insert the mail into each of the destination groups.
 503     (while group-art-list
 504       (setq group-art (car group-art-list)
 505             group-art-list (cdr group-art-list))
 506
 507       ;; Kill the previous newsgroup markers.
 508       (goto-char (point-min))
 509       (search-forward "\n\n" nil t)
 510       (forward-line -1)
 511       (while (search-backward (concat "\n" nnfolder-article-marker) nil t)
 512         (delete-region (1+ (point)) (progn (forward-line 2) (point))))
 513
 514       ;; Insert the new newsgroup marker.
 515       (nnfolder-possibly-change-group (car group-art))
 516       (nnfolder-insert-newsgroup-line group-art)
 517       (let ((beg (point-min))
 518             (end (point-max))
 519             (obuf (current-buffer)))
 520         (set-buffer nnfolder-current-buffer)
 521         (goto-char (point-max))
 522         (insert-buffer-substring obuf beg end)
 523         (set-buffer obuf)))
 524
 525     ;; Did we save it anywhere?
 526     save-list))
 527
 528 (defun nnfolder-insert-newsgroup-line (group-art)
 529   (save-excursion
 530     (goto-char (point-min))
 531     (if (search-forward "\n\n" nil t)
 532         (progn
 533           (forward-char -1)
 534           (insert (format (concat nnfolder-article-marker "%d   %s\n")
 535                           (cdr group-art) (current-time-string)))))))
 536
 537 (defun nnfolder-possibly-activate-groups (&optional group)
 538   (save-excursion
 539     ;; If we're looking for the activation of a specific group, find out
 540     ;; its real name and switch to it.
 541     (if group (nnfolder-possibly-change-group group))
 542     ;; If the group alist isn't active, activate it now.
 543     (nnmail-activate 'nnfolder)))
 544
 545 (defun nnfolder-active-number (group)
 546   (save-excursion
 547     ;; Find the next article number in GROUP.
 548     (prog1
 549         (let ((active (car (cdr (assoc group nnfolder-group-alist)))))
 550           (if active
 551               (setcdr active (1+ (cdr active)))
 552             ;; This group is new, so we create a new entry for it.
 553             ;; This might be a bit naughty... creating groups on the drop of
 554             ;; a hat, but I don't know...
 555             (setq nnfolder-group-alist
 556                   (cons (list group (setq active (cons 1 1)))
 557                         nnfolder-group-alist)))
 558           (cdr active))
 559       (nnmail-save-active nnfolder-group-alist nnfolder-active-file)
 560       (nnfolder-possibly-activate-groups group)
 561       )))
 562
 563
 564 ;; This method has a problem if you've accidentally let the active list get
 565 ;; out of sync with the files.  This could happen, say, if you've
 566 ;; accidentally gotten new mail with something other than Gnus (but why
 567 ;; would _that_ ever happen? :-).  In that case, we will be in the middle of
 568 ;; processing the file, ready to add new X-Gnus article number markers, and
 569 ;; we'll run accross a message with no ID yet - the active list _may_not_ be
 570 ;; ready for us yet.
 571
 572 ;; To handle this, I'm modifying this routine to maintain the maximum ID seen
 573 ;; so far, and when we hit a message with no ID, we will _manually_ scan the
 574 ;; rest of the message looking for any more, possibly higher IDs.  We'll
 575 ;; assume the maximum that we find is the highest active.  Note that this
 576 ;; shouldn't cost us much extra time at all, but will be a lot less
 577 ;; vulnerable to glitches between the mbox and the active file.
 578
 579 (defun nnfolder-read-folder (file)
 580   (save-excursion
 581     (nnfolder-possibly-activate-groups nil)
 582     ;; We should be paranoid here and make sure the group is in the alist,
 583     ;; and add it if it isn't.
 584     ;;(if (not (assoc nnfoler-current-group nnfolder-group-alist)
 585     (set-buffer (setq nnfolder-current-buffer
 586                       (nnheader-find-file-noselect file nil 'raw)))
 587     (buffer-disable-undo (current-buffer))
 588     (let ((delim (concat "^" rmail-unix-mail-delimiter))
 589           (marker (concat "\n" nnfolder-article-marker))
 590           (number "[0-9]+")
 591           (active (car (cdr (assoc nnfolder-current-group
 592                                    nnfolder-group-alist))))
 593           activenumber activemin start end)
 594       (goto-char (point-min))
 595       ;;
 596       ;; Anytime the active number is 1 or 0, it is supect.  In that case,
 597       ;; search the file manually to find the active number.  Or, of course,
 598       ;; if we're being paranoid.  (This would also be the place to build
 599       ;; other lists from the header markers, such as expunge lists, etc., if
 600       ;; we ever desired to abandon the active file entirely for mboxes.)
 601       (setq activenumber (cdr active))
 602       (if (or nnfolder-ignore-active-file
 603               (< activenumber 2))
 604           (progn
 605             (setq activemin (max (1- (lsh 1 23))
 606                                  (1- (lsh 1 24))
 607                                  (1- (lsh 1 25))))
 608             (while (and (search-forward marker nil t)
 609                         (re-search-forward number nil t))
 610               (let ((newnum (string-to-number (buffer-substring
 611                                                (match-beginning 0)
 612                                                (match-end 0)))))
 613                 (setq activenumber (max activenumber newnum))
 614                 (setq activemin (min activemin newnum))))
 615             (setcar active (max 1 (min activemin activenumber)))
 616             (setcdr active (max activenumber (cdr active)))
 617             (goto-char (point-min))))
 618
 619       ;; Keep track of the active number on our own, and insert it back into
 620       ;; the active list when we're done. Also, prime the pump to cut down on
 621       ;; the number of searches we do.
 622       (setq end (point-marker))
 623       (set-marker end (or (and (re-search-forward delim nil t)
 624                                (match-beginning 0))
 625                           (point-max)))
 626       (while (not (= end (point-max)))
 627         (setq start (marker-position end))
 628         (goto-char end)
 629         ;; There may be more than one "From " line, so we skip past
 630         ;; them.
 631         (while (looking-at delim)
 632           (forward-line 1))
 633         (set-marker end (or (and (re-search-forward delim nil t)
 634                                  (match-beginning 0))
 635                             (point-max)))
 636         (goto-char start)
 637         (if (not (search-forward marker end t))
 638             (progn
 639               (narrow-to-region start end)
 640               (nnmail-insert-lines)
 641               (nnfolder-insert-newsgroup-line
 642                (cons nil (nnfolder-active-number nnfolder-current-group)))
 643               (widen))))
 644
 645       ;; Make absolutely sure that the active list reflects reality!
 646       (nnmail-save-active nnfolder-group-alist nnfolder-active-file)
 647       (current-buffer))))
 648
 649 (defun nnfolder-get-new-mail (&optional group)
 650   "Read new incoming mail."
 651   (let* ((spools (nnmail-get-spool-files group))
 652          (group-in group)
 653          incomings incoming)
 654     (if (or (not nnfolder-get-new-mail) (not nnmail-spool-file))
 655         ()
 656       ;; We first activate all the groups.
 657       (nnfolder-possibly-activate-groups nil)
 658       ;; The we go through all the existing spool files and split the
 659       ;; mail from each.
 660       (while spools
 661         (and
 662          (file-exists-p (car spools))
 663          (> (nth 7 (file-attributes (car spools))) 0)
 664          (progn
 665            (and gnus-verbose-backends
 666                 (message "nnfolder: Reading incoming mail..."))
 667            (if (not (setq incoming
 668                           (nnmail-move-inbox
 669                            (car spools)
 670                            (concat (file-name-as-directory nnfolder-directory)
 671                                    "Incoming"))))
 672                ()
 673              (setq incomings (cons incoming incomings))
 674              (setq group (nnmail-get-split-group (car spools) group-in))
 675              (nnmail-split-incoming incoming 'nnfolder-save-mail nil group))))
 676         (setq spools (cdr spools)))
 677       ;; If we did indeed read any incoming spools, we save all info.
 678       (if incoming
 679           (progn
 680             (nnmail-save-active nnfolder-group-alist nnfolder-active-file)
 681             (run-hooks 'nnmail-read-incoming-hook)
 682             (and gnus-verbose-backends
 683                  (message "nnfolder: Reading incoming mail...done"))))
 684       (let ((bufs nnfolder-buffer-alist))
 685         (save-excursion
 686           (while bufs
 687             (if (not (buffer-name (nth 1 (car bufs))))
 688                 (setq nnfolder-buffer-alist
 689                       (delq (car bufs) nnfolder-buffer-alist))
 690               (set-buffer (nth 1 (car bufs)))
 691               (and (buffer-modified-p) (save-buffer)))
 692             (setq bufs (cdr bufs)))))
 693       (while incomings
 694         (setq incoming (car incomings))
 695         (and
 696          nnmail-delete-incoming
 697          (file-writable-p incoming)
 698          (file-exists-p incoming)
 699          (delete-file incoming))
 700         (setq incomings (cdr incomings))))))
 701
 702 (provide 'nnfolder)
 703
 704 ;;; nnfolder.el ends here