code.delx.au - gnu-emacs/blob - lisp/gnus/nnmbox.el

   1 ;;; nnmbox.el --- mail mbox access for Gnus
   2
   3 ;; Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   4 ;;   2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
   5
   6 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   7 ;;      Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
   8 ;; Keywords: news, mail
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  24
  25 ;;; Commentary:
  26
  27 ;; For an overview of what the interface functions do, please see the
  28 ;; Gnus sources.
  29
  30 ;;; Code:
  31
  32 (require 'nnheader)
  33 (require 'message)
  34 (require 'nnmail)
  35 (require 'nnoo)
  36 (require 'gnus-range)
  37 (eval-when-compile (require 'cl))
  38
  39 (nnoo-declare nnmbox)
  40
  41 (defvoo nnmbox-mbox-file (expand-file-name "~/mbox")
  42   "The name of the mail box file in the user's home directory.")
  43
  44 (defvoo nnmbox-active-file (expand-file-name "~/.mbox-active")
  45   "The name of the active file for the mail box.")
  46
  47 (defvoo nnmbox-get-new-mail t
  48   "If non-nil, nnmbox will check the incoming mail file and split the mail.")
  49
  50 (defvoo nnmbox-prepare-save-mail-hook nil
  51   "Hook run narrowed to an article before saving.")
  52
  53 \f
  54
  55 (defconst nnmbox-version "nnmbox 1.0"
  56   "nnmbox version.")
  57
  58 (defvoo nnmbox-current-group nil
  59   "Current nnmbox news group directory.")
  60
  61 (defvar nnmbox-mbox-buffer nil)
  62
  63 (defvoo nnmbox-status-string "")
  64
  65 (defvoo nnmbox-group-alist nil)
  66 (defvoo nnmbox-active-timestamp nil)
  67
  68 (defvoo nnmbox-file-coding-system mm-binary-coding-system)
  69 (defvoo nnmbox-file-coding-system-for-write nil)
  70 (defvoo nnmbox-active-file-coding-system mm-binary-coding-system)
  71 (defvoo nnmbox-active-file-coding-system-for-write nil)
  72
  73 (defvar nnmbox-group-building-active-articles nil)
  74 (defvar nnmbox-group-active-articles nil)
  75 \f
  76
  77 ;;; Interface functions
  78
  79 (nnoo-define-basics nnmbox)
  80
  81 (deffoo nnmbox-retrieve-headers (sequence &optional newsgroup server fetch-old)
  82   (save-excursion
  83     (set-buffer nntp-server-buffer)
  84     (erase-buffer)
  85     (let ((number (length sequence))
  86           (count 0)
  87           article start stop)
  88       (nnmbox-possibly-change-newsgroup newsgroup server)
  89       (while sequence
  90         (setq article (car sequence))
  91         (set-buffer nnmbox-mbox-buffer)
  92         (when (nnmbox-find-article article)
  93           (setq start
  94                 (save-excursion
  95                   (re-search-backward
  96                    (concat "^" message-unix-mail-delimiter) nil t)
  97                   (point)))
  98           (search-forward "\n\n" nil t)
  99           (setq stop (1- (point)))
 100           (set-buffer nntp-server-buffer)
 101           (insert (format "221 %d Article retrieved.\n" article))
 102           (insert-buffer-substring nnmbox-mbox-buffer start stop)
 103           (goto-char (point-max))
 104           (insert ".\n"))
 105         (setq sequence (cdr sequence))
 106         (setq count (1+ count))
 107         (and (numberp nnmail-large-newsgroup)
 108              (> number nnmail-large-newsgroup)
 109              (zerop (% count 20))
 110              (nnheader-message 5 "nnmbox: Receiving headers... %d%%"
 111                                (/ (* count 100) number))))
 112
 113       (and (numberp nnmail-large-newsgroup)
 114            (> number nnmail-large-newsgroup)
 115            (nnheader-message 5 "nnmbox: Receiving headers...done"))
 116
 117       (set-buffer nntp-server-buffer)
 118       (nnheader-fold-continuation-lines)
 119       'headers)))
 120
 121 (deffoo nnmbox-open-server (server &optional defs)
 122   (nnoo-change-server 'nnmbox server defs)
 123   (nnmbox-create-mbox)
 124   (cond
 125    ((not (file-exists-p nnmbox-mbox-file))
 126     (nnmbox-close-server)
 127     (nnheader-report 'nnmbox "No such file: %s" nnmbox-mbox-file))
 128    ((file-directory-p nnmbox-mbox-file)
 129     (nnmbox-close-server)
 130     (nnheader-report 'nnmbox "Not a regular file: %s" nnmbox-mbox-file))
 131    (t
 132     (nnheader-report 'nnmbox "Opened server %s using mbox %s" server
 133                      nnmbox-mbox-file)
 134     t)))
 135
 136 (deffoo nnmbox-close-server (&optional server)
 137   (when (and nnmbox-mbox-buffer
 138              (buffer-name nnmbox-mbox-buffer))
 139     (kill-buffer nnmbox-mbox-buffer))
 140   (nnoo-close-server 'nnmbox server)
 141   t)
 142
 143 (deffoo nnmbox-server-opened (&optional server)
 144   (and (nnoo-current-server-p 'nnmbox server)
 145        nnmbox-mbox-buffer
 146        (buffer-name nnmbox-mbox-buffer)
 147        nntp-server-buffer
 148        (buffer-name nntp-server-buffer)))
 149
 150 (deffoo nnmbox-request-article (article &optional newsgroup server buffer)
 151   (nnmbox-possibly-change-newsgroup newsgroup server)
 152   (save-excursion
 153     (set-buffer nnmbox-mbox-buffer)
 154     (when (nnmbox-find-article article)
 155       (let (start stop)
 156         (re-search-backward (concat "^" message-unix-mail-delimiter) nil t)
 157         (setq start (point))
 158         (forward-line 1)
 159         (setq stop (if (re-search-forward (concat "^"
 160                                                   message-unix-mail-delimiter)
 161                                           nil 'move)
 162                        (match-beginning 0)
 163                      (point)))
 164         (let ((nntp-server-buffer (or buffer nntp-server-buffer)))
 165           (set-buffer nntp-server-buffer)
 166           (erase-buffer)
 167           (insert-buffer-substring nnmbox-mbox-buffer start stop)
 168           (goto-char (point-min))
 169           (while (looking-at "From ")
 170             (delete-char 5)
 171             (insert "X-From-Line: ")
 172             (forward-line 1))
 173           (if (numberp article)
 174               (cons nnmbox-current-group article)
 175             (nnmbox-article-group-number nil)))))))
 176
 177 (deffoo nnmbox-request-group (group &optional server dont-check)
 178   (nnmbox-possibly-change-newsgroup nil server)
 179   (let ((active (cadr (assoc group nnmbox-group-alist))))
 180     (cond
 181      ((or (null active)
 182           (null (nnmbox-possibly-change-newsgroup group server)))
 183       (nnheader-report 'nnmbox "No such group: %s" group))
 184      (dont-check
 185       (nnheader-report 'nnmbox "Selected group %s" group)
 186       (nnheader-insert ""))
 187      (t
 188       (nnheader-report 'nnmbox "Selected group %s" group)
 189       (nnheader-insert "211 %d %d %d %s\n"
 190                        (1+ (- (cdr active) (car active)))
 191                        (car active) (cdr active) group)))))
 192
 193 (defun nnmbox-save-buffer ()
 194   (let ((coding-system-for-write
 195          (or nnmbox-file-coding-system-for-write
 196              nnmbox-file-coding-system)))
 197     (save-buffer)))
 198
 199 (defun nnmbox-save-active (group-alist active-file)
 200   (let ((nnmail-active-file-coding-system
 201          (or nnmbox-active-file-coding-system-for-write
 202              nnmbox-active-file-coding-system)))
 203     (nnmail-save-active group-alist active-file)))
 204
 205 (deffoo nnmbox-request-scan (&optional group server)
 206   (nnmbox-possibly-change-newsgroup group server)
 207   (nnmbox-read-mbox)
 208   (nnmail-get-new-mail
 209    'nnmbox
 210    (lambda ()
 211      (save-excursion
 212        (set-buffer nnmbox-mbox-buffer)
 213        (nnmbox-save-buffer)))
 214    (file-name-directory nnmbox-mbox-file)
 215    group
 216    (lambda ()
 217      (save-excursion
 218        (let ((in-buf (current-buffer)))
 219          (set-buffer nnmbox-mbox-buffer)
 220          (goto-char (point-max))
 221          (insert-buffer-substring in-buf)))
 222      (nnmbox-save-active nnmbox-group-alist nnmbox-active-file))))
 223
 224 (deffoo nnmbox-close-group (group &optional server)
 225   t)
 226
 227 (deffoo nnmbox-request-create-group (group &optional server args)
 228   (nnmail-activate 'nnmbox)
 229   (unless (assoc group nnmbox-group-alist)
 230     (push (list group (cons 1 0))
 231           nnmbox-group-alist)
 232     (nnmbox-save-active nnmbox-group-alist nnmbox-active-file))
 233   t)
 234
 235 (deffoo nnmbox-request-list (&optional server)
 236   (save-excursion
 237     (let ((nnmail-file-coding-system
 238            nnmbox-active-file-coding-system))
 239       (nnmail-find-file nnmbox-active-file))
 240     (setq nnmbox-group-alist (nnmail-get-active))
 241     t))
 242
 243 (deffoo nnmbox-request-newgroups (date &optional server)
 244   (nnmbox-request-list server))
 245
 246 (deffoo nnmbox-request-list-newsgroups (&optional server)
 247   (nnheader-report 'nnmbox "LIST NEWSGROUPS is not implemented."))
 248
 249 (deffoo nnmbox-request-expire-articles
 250     (articles newsgroup &optional server force)
 251   (nnmbox-possibly-change-newsgroup newsgroup server)
 252   (let* ((is-old t)
 253          rest)
 254     (nnmail-activate 'nnmbox)
 255
 256     (save-excursion
 257       (set-buffer nnmbox-mbox-buffer)
 258       (while (and articles is-old)
 259         (when (nnmbox-find-article (car articles))
 260           (if (setq is-old
 261                     (nnmail-expired-article-p
 262                      newsgroup
 263                      (buffer-substring
 264                       (point) (progn (end-of-line) (point))) force))
 265               (progn
 266                 (unless (eq nnmail-expiry-target 'delete)
 267                   (with-temp-buffer
 268                     (nnmbox-request-article (car articles)
 269                                              newsgroup server
 270                                              (current-buffer))
 271                     (let ((nnml-current-directory nil))
 272                       (nnmail-expiry-target-group
 273                        nnmail-expiry-target newsgroup)))
 274                   (nnmbox-possibly-change-newsgroup newsgroup server))
 275                 (nnheader-message 5 "Deleting article %d in %s..."
 276                                   (car articles) newsgroup)
 277                 (nnmbox-delete-mail))
 278             (push (car articles) rest)))
 279         (setq articles (cdr articles)))
 280       (nnmbox-save-buffer)
 281       ;; Find the lowest active article in this group.
 282       (let ((active (nth 1 (assoc newsgroup nnmbox-group-alist))))
 283         (while (and (not (nnmbox-find-article (car active)))
 284                     (<= (car active) (cdr active)))
 285           (setcar active (1+ (car active)))))
 286       (nnmbox-save-active nnmbox-group-alist nnmbox-active-file)
 287       (nconc rest articles))))
 288
 289 (deffoo nnmbox-request-move-article
 290     (article group server accept-form &optional last move-is-internal)
 291   (let ((buf (get-buffer-create " *nnmbox move*"))
 292         result)
 293     (and
 294      (nnmbox-request-article article group server)
 295      (save-excursion
 296        (set-buffer buf)
 297        (erase-buffer)
 298        (insert-buffer-substring nntp-server-buffer)
 299        (goto-char (point-min))
 300        (while (re-search-forward
 301                "^X-Gnus-Newsgroup:"
 302                (save-excursion (search-forward "\n\n" nil t) (point)) t)
 303          (gnus-delete-line))
 304        (setq result (eval accept-form))
 305        (kill-buffer buf)
 306        result)
 307      (save-excursion
 308        (nnmbox-possibly-change-newsgroup group server)
 309        (set-buffer nnmbox-mbox-buffer)
 310        (when (nnmbox-find-article article)
 311          (nnmbox-delete-mail))
 312        (and last (nnmbox-save-buffer))))
 313     result))
 314
 315 (deffoo nnmbox-request-accept-article (group &optional server last)
 316   (nnmbox-possibly-change-newsgroup group server)
 317   (nnmail-check-syntax)
 318   (let ((buf (current-buffer))
 319         result cont)
 320     (and
 321      (nnmail-activate 'nnmbox)
 322      (with-temp-buffer
 323        (insert-buffer-substring buf)
 324        (goto-char (point-min))
 325        (cond (;; The From line may have been quoted by movemail.
 326               (looking-at (concat ">" message-unix-mail-delimiter))
 327               (delete-char 1)
 328               (forward-line 1))
 329              ((looking-at "X-From-Line: ")
 330               (replace-match "From ")
 331               (forward-line 1))
 332              (t
 333               (insert "From nobody " (current-time-string) "\n")))
 334        (narrow-to-region (point)
 335                          (if (search-forward "\n\n" nil 'move)
 336                              (1- (point))
 337                            (point)))
 338        (while (re-search-backward "^X-Gnus-Newsgroup: " nil t)
 339          (delete-region (point) (progn (forward-line 1) (point))))
 340        (when nnmail-cache-accepted-message-ids
 341          (nnmail-cache-insert (message-fetch-field "message-id")
 342                               group
 343                               (message-fetch-field "subject")
 344                               (message-fetch-field "from")))
 345        (widen)
 346        (setq result (if (stringp group)
 347                         (list (cons group (nnmbox-active-number group)))
 348                       (nnmail-article-group 'nnmbox-active-number)))
 349        (prog1
 350            (if (and (null result)
 351                     (yes-or-no-p "Moved to `junk' group; delete article? "))
 352                (setq result 'junk)
 353              (setq result (car (nnmbox-save-mail result))))
 354          (setq cont (buffer-string))))
 355      (with-current-buffer nnmbox-mbox-buffer
 356        (goto-char (point-max))
 357        (insert cont)
 358        (when last
 359          (when nnmail-cache-accepted-message-ids
 360            (nnmail-cache-close))
 361          (nnmbox-save-active nnmbox-group-alist nnmbox-active-file)
 362          (nnmbox-save-buffer))))
 363     result))
 364
 365 (deffoo nnmbox-request-replace-article (article group buffer)
 366   (nnmbox-possibly-change-newsgroup group)
 367   (save-excursion
 368     (set-buffer nnmbox-mbox-buffer)
 369     (if (not (nnmbox-find-article article))
 370         nil
 371       (nnmbox-delete-mail t t)
 372       (insert
 373        (with-temp-buffer
 374          (insert-buffer-substring buffer)
 375          (goto-char (point-min))
 376          (when (looking-at "X-From-Line:")
 377            (delete-region (point) (progn (forward-line 1) (point))))
 378          (while (re-search-forward (concat "^" message-unix-mail-delimiter)
 379                                    nil t)
 380            (goto-char (match-beginning 0))
 381            (insert ">"))
 382          (goto-char (point-max))
 383          (unless (bolp)
 384            (insert "\n"))
 385          (buffer-string)))
 386       (nnmbox-save-buffer)
 387       t)))
 388
 389 (deffoo nnmbox-request-delete-group (group &optional force server)
 390   (nnmbox-possibly-change-newsgroup group server)
 391   ;; Delete all articles in GROUP.
 392   (if (not force)
 393       ()                                ; Don't delete the articles.
 394     (save-excursion
 395       (set-buffer nnmbox-mbox-buffer)
 396       (goto-char (point-min))
 397       ;; Delete all articles in this group.
 398       (let ((ident (concat "\nX-Gnus-Newsgroup: " nnmbox-current-group ":"))
 399             found)
 400         (while (search-forward ident nil t)
 401           (setq found t)
 402           (nnmbox-delete-mail))
 403         (when found
 404           (nnmbox-save-buffer)))))
 405   ;; Remove the group from all structures.
 406   (setq nnmbox-group-alist
 407         (delq (assoc group nnmbox-group-alist) nnmbox-group-alist)
 408         nnmbox-current-group nil)
 409   ;; Save the active file.
 410   (nnmbox-save-active nnmbox-group-alist nnmbox-active-file)
 411   t)
 412
 413 (deffoo nnmbox-request-rename-group (group new-name &optional server)
 414   (nnmbox-possibly-change-newsgroup group server)
 415   (save-excursion
 416     (set-buffer nnmbox-mbox-buffer)
 417     (goto-char (point-min))
 418     (let ((ident (concat "\nX-Gnus-Newsgroup: " nnmbox-current-group ":"))
 419           (new-ident (concat "\nX-Gnus-Newsgroup: " new-name ":"))
 420           found)
 421       (while (search-forward ident nil t)
 422         (replace-match new-ident t t)
 423         (setq found t))
 424       (when found
 425         (nnmbox-save-buffer))))
 426   (let ((entry (assoc group nnmbox-group-active-articles)))
 427     (when entry
 428       (setcar entry new-name)))
 429   (let ((entry (assoc group nnmbox-group-alist)))
 430     (when entry
 431       (setcar entry new-name))
 432     (setq nnmbox-current-group nil)
 433     ;; Save the new group alist.
 434     (nnmbox-save-active nnmbox-group-alist nnmbox-active-file)
 435     t))
 436
 437 \f
 438 ;;; Internal functions.
 439
 440 ;; If FORCE, delete article no matter how many X-Gnus-Newsgroup
 441 ;; headers there are.  If LEAVE-DELIM, don't delete the Unix mbox
 442 ;; delimiter line.
 443 (defun nnmbox-delete-mail (&optional force leave-delim)
 444   ;; Delete the current X-Gnus-Newsgroup line.
 445   ;; First delete record of active article, unless the article is being
 446   ;; replaced, indicated by FORCE being non-nil.
 447   (if (not force)
 448       (nnmbox-record-deleted-article (nnmbox-article-group-number t)))
 449   (or force
 450       (gnus-delete-line))
 451   ;; Beginning of the article.
 452   (save-excursion
 453     (save-restriction
 454       (narrow-to-region
 455        (prog2
 456            (re-search-backward (concat "^" message-unix-mail-delimiter) nil t)
 457            (if leave-delim (progn (forward-line 1) (point))
 458              (match-beginning 0))
 459          (forward-line 1))
 460        (or (and (re-search-forward (concat "^" message-unix-mail-delimiter)
 461                                    nil t)
 462                 (match-beginning 0))
 463            (point-max)))
 464       (goto-char (point-min))
 465       ;; Only delete the article if no other group owns it as well.
 466       (when (or force
 467                 (not (re-search-forward "^X-Gnus-Newsgroup: " nil t))
 468                 (search-backward "\n\n" nil t))
 469         (delete-region (point-min) (point-max))))))
 470
 471 (defun nnmbox-possibly-change-newsgroup (newsgroup &optional server)
 472   (when (and server
 473              (not (nnmbox-server-opened server)))
 474     (nnmbox-open-server server))
 475   (when (or (not nnmbox-mbox-buffer)
 476             (not (buffer-name nnmbox-mbox-buffer)))
 477     (nnmbox-read-mbox))
 478   (when (not nnmbox-group-alist)
 479     (nnmail-activate 'nnmbox))
 480   (if newsgroup
 481       (when (assoc newsgroup nnmbox-group-alist)
 482         (setq nnmbox-current-group newsgroup))
 483     t))
 484
 485 (defun nnmbox-article-string (article)
 486   (if (numberp article)
 487       (concat "\nX-Gnus-Newsgroup: " nnmbox-current-group ":"
 488               (int-to-string article) " ")
 489     (concat "\nMessage-ID: " article)))
 490
 491 (defun nnmbox-article-group-number (this-line)
 492   (save-excursion
 493     (if this-line
 494         (beginning-of-line)
 495       (goto-char (point-min)))
 496     (when (re-search-forward "^X-Gnus-Newsgroup: +\\([^:]+\\):\\([0-9]+\\) "
 497                              nil t)
 498       (cons (buffer-substring (match-beginning 1) (match-end 1))
 499             (string-to-number
 500              (buffer-substring (match-beginning 2) (match-end 2)))))))
 501
 502 (defun nnmbox-in-header-p (pos)
 503   "Return non-nil if POS is in the header of an article."
 504   (save-excursion
 505     (goto-char pos)
 506     (re-search-backward (concat "^" message-unix-mail-delimiter) nil t)
 507     (search-forward "\n\n" nil t)
 508     (< pos (point))))
 509
 510 (defun nnmbox-find-article (article)
 511   "Leaves point on the relevant X-Gnus-Newsgroup line if found."
 512   ;; Check that article is in the active range first, to avoid an
 513   ;; expensive exhaustive search if it isn't.
 514   (if (and (numberp article)
 515            (not (nnmbox-is-article-active-p article)))
 516       nil
 517     (let ((art-string (nnmbox-article-string article))
 518           (found nil))
 519       ;; There is the possibility that the X-Gnus-Newsgroup line appears
 520       ;; in the body of an article (for instance, if an article has been
 521       ;; forwarded from someone using Gnus as their mailer), so check
 522       ;; that the line is actually part of the article header.
 523       (or (and (search-forward art-string nil t)
 524                (nnmbox-in-header-p (point)))
 525           (progn
 526             (goto-char (point-min))
 527             (while (and (not found)
 528                         (search-forward art-string nil t))
 529               (setq found (nnmbox-in-header-p (point))))
 530             found)))))
 531
 532 (defun nnmbox-record-active-article (group-art)
 533   (let* ((group (car group-art))
 534          (article (cdr group-art))
 535          (entry
 536           (or (assoc group nnmbox-group-active-articles)
 537               (progn
 538                 (push (list group)
 539                       nnmbox-group-active-articles)
 540                 (car nnmbox-group-active-articles)))))
 541     ;; add article to index, either by building complete list
 542     ;; in reverse order, or as a list of ranges.
 543     (if (not nnmbox-group-building-active-articles)
 544         (setcdr entry (gnus-add-to-range (cdr entry) (list article)))
 545       (when (memq article (cdr entry))
 546         (switch-to-buffer nnmbox-mbox-buffer)
 547         (error "Article %s:%d already exists!" group article))
 548       (when (and (cadr entry) (< article (cadr entry)))
 549         (switch-to-buffer nnmbox-mbox-buffer)
 550         (error "Article %s:%d out of order" group article))
 551       (setcdr entry (cons article (cdr entry))))))
 552
 553 (defun nnmbox-record-deleted-article (group-art)
 554   (let* ((group (car group-art))
 555          (article (cdr group-art))
 556          (entry
 557           (or (assoc group nnmbox-group-active-articles)
 558               (progn
 559                 (push (list group)
 560                       nnmbox-group-active-articles)
 561                 (car nnmbox-group-active-articles)))))
 562     ;; remove article from index
 563     (setcdr entry (gnus-remove-from-range (cdr entry) (list article)))))
 564
 565 (defun nnmbox-is-article-active-p (article)
 566   (gnus-member-of-range
 567    article
 568    (cdr (assoc nnmbox-current-group
 569                nnmbox-group-active-articles))))
 570
 571 (defun nnmbox-save-mail (group-art)
 572   "Called narrowed to an article."
 573   (let ((delim (concat "^" message-unix-mail-delimiter)))
 574     (goto-char (point-min))
 575     ;; This might come from somewhere else.
 576     (if (looking-at delim)
 577         (forward-line 1)
 578       (insert "From nobody " (current-time-string) "\n"))
 579     ;; Quote all "From " lines in the article.
 580     (while (re-search-forward delim nil t)
 581       (goto-char (match-beginning 0))
 582       (insert ">")))
 583   (goto-char (point-max))
 584   (unless (bolp)
 585     (insert "\n"))
 586   (nnmail-insert-lines)
 587   (nnmail-insert-xref group-art)
 588   (nnmbox-insert-newsgroup-line group-art)
 589   (let ((alist group-art))
 590     (while alist
 591       (nnmbox-record-active-article (car alist))
 592       (setq alist (cdr alist))))
 593   (run-hooks 'nnmail-prepare-save-mail-hook)
 594   (run-hooks 'nnmbox-prepare-save-mail-hook)
 595   group-art)
 596
 597 (defun nnmbox-insert-newsgroup-line (group-art)
 598   (save-excursion
 599     (goto-char (point-min))
 600     (when (search-forward "\n\n" nil t)
 601       (forward-char -1)
 602       (while group-art
 603         (insert (format "X-Gnus-Newsgroup: %s:%d   %s\n"
 604                         (caar group-art) (cdar group-art)
 605                         (current-time-string)))
 606         (setq group-art (cdr group-art))))
 607     t))
 608
 609 (defun nnmbox-active-number (group)
 610   ;; Find the next article number in GROUP.
 611   (let ((active (cadr (assoc group nnmbox-group-alist))))
 612     (if active
 613         (setcdr active (1+ (cdr active)))
 614       ;; This group is new, so we create a new entry for it.
 615       ;; This might be a bit naughty... creating groups on the drop of
 616       ;; a hat, but I don't know...
 617       (push (list group (setq active (cons 1 1)))
 618             nnmbox-group-alist))
 619     (cdr active)))
 620
 621 (defun nnmbox-create-mbox ()
 622   (when (not (file-exists-p nnmbox-mbox-file))
 623     (let ((nnmail-file-coding-system
 624            (or nnmbox-file-coding-system-for-write
 625                nnmbox-file-coding-system))
 626           (dir (file-name-directory nnmbox-mbox-file)))
 627       (and dir (gnus-make-directory dir))
 628       (nnmail-write-region (point-min) (point-min)
 629                            nnmbox-mbox-file t 'nomesg))))
 630
 631 (defun nnmbox-read-mbox ()
 632   (nnmail-activate 'nnmbox)
 633   (nnmbox-create-mbox)
 634   (if (and nnmbox-mbox-buffer
 635            (buffer-name nnmbox-mbox-buffer)
 636            (save-excursion
 637              (set-buffer nnmbox-mbox-buffer)
 638              (= (buffer-size) (nnheader-file-size nnmbox-mbox-file))))
 639       ()
 640     (save-excursion
 641       (let ((delim (concat "^" message-unix-mail-delimiter))
 642             (alist nnmbox-group-alist)
 643             (nnmbox-group-building-active-articles t)
 644             start end end-header number)
 645         (set-buffer (setq nnmbox-mbox-buffer
 646                           (let ((nnheader-file-coding-system
 647                                  nnmbox-file-coding-system))
 648                             (nnheader-find-file-noselect
 649                              nnmbox-mbox-file t t))))
 650         (mm-enable-multibyte)
 651         (buffer-disable-undo)
 652
 653         ;; Go through the group alist and compare against the mbox file.
 654         (while alist
 655           (goto-char (point-max))
 656           (when (and (re-search-backward
 657                       (format "^X-Gnus-Newsgroup: %s:\\([0-9]+\\) "
 658                               (caar alist)) nil t)
 659                      (> (setq number
 660                               (string-to-number
 661                                (buffer-substring
 662                                 (match-beginning 1) (match-end 1))))
 663                         (cdadar alist)))
 664             (setcdr (cadar alist) number))
 665           (setq alist (cdr alist)))
 666
 667         ;; Examine all articles for our private X-Gnus-Newsgroup
 668         ;; headers.  This is done primarily as a consistency check, but
 669         ;; it is convenient for building an index of the articles
 670         ;; present, to avoid costly searches for missing articles
 671         ;; (eg. when expiring articles).
 672         (goto-char (point-min))
 673         (setq nnmbox-group-active-articles nil)
 674         (while (re-search-forward delim nil t)
 675           (setq start (match-beginning 0))
 676           (save-excursion
 677             (search-forward "\n\n" nil t)
 678             (setq end-header (point))
 679             (setq end (or (and
 680                            (re-search-forward delim nil t)
 681                            (match-beginning 0))
 682                           (point-max))))
 683           (if (search-forward "\nX-Gnus-Newsgroup: " end-header t)
 684               ;; Build a list of articles in each group, remembering
 685               ;; that each article may be in more than one group.
 686               (progn
 687                 (nnmbox-record-active-article (nnmbox-article-group-number t))
 688                 (while (search-forward "\nX-Gnus-Newsgroup: " end-header t)
 689                   (nnmbox-record-active-article (nnmbox-article-group-number t))))
 690             ;; The article is either new, or for some other reason
 691             ;; hasn't got our private headers, so add them now.  The
 692             ;; only situation I've encountered when the X-Gnus-Newsgroup
 693             ;; header is missing is if the article contains a forwarded
 694             ;; message which does contain that header line (earlier
 695             ;; versions of Gnus didn't restrict their search to the
 696             ;; headers).  In this case, there is an Xref line which
 697             ;; provides the relevant information to construct the
 698             ;; missing header(s).
 699             (save-excursion
 700               (save-restriction
 701                 (narrow-to-region start end)
 702                 (if (re-search-forward "\nXref: [^ ]+" end-header t)
 703                     ;; generate headers from Xref:
 704                     (let (alist)
 705                       (while (re-search-forward " \\([^:]+\\):\\([0-9]+\\)" end-header t)
 706                         (push (cons (match-string 1)
 707                                     (string-to-number (match-string 2))) alist))
 708                       (nnmbox-insert-newsgroup-line alist))
 709                   ;; this is really a new article
 710                   (nnmbox-save-mail
 711                    (nnmail-article-group 'nnmbox-active-number))))))
 712           (goto-char end))
 713         ;; put article lists in order
 714         (setq alist nnmbox-group-active-articles)
 715         (while alist
 716           (setcdr (car alist) (gnus-compress-sequence (nreverse (cdar alist))))
 717           (setq alist (cdr alist)))))))
 718
 719 (provide 'nnmbox)
 720
 721 ;; arch-tag: 611dd95f-be37-413a-b3ae-8b059ba93659
 722 ;;; nnmbox.el ends here