lisp/gnus/nnfolder.el

   1 ;;; nnfolder.el --- mail folder access for Gnus
   2
   3 ;; Copyright (C) 1995-2012 Free Software Foundation, Inc.
   4
   5 ;; Author: Simon Josefsson <simon@josefsson.org>
   6 ;;      ShengHuo Zhu <zsh@cs.rochester.edu> (adding NOV)
   7 ;;      Scott Byer <byer@mv.us.adobe.com>
   8 ;;      Lars Magne Ingebrigtsen <larsi@gnus.org>
   9 ;;      Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
  10 ;; Keywords: mail
  11
  12 ;; This file is part of GNU Emacs.
  13
  14 ;; GNU Emacs is free software: you can redistribute it and/or modify
  15 ;; it under the terms of the GNU General Public License as published by
  16 ;; the Free Software Foundation, either version 3 of the License, or
  17 ;; (at your option) any later version.
  18
  19 ;; GNU Emacs is distributed in the hope that it will be useful,
  20 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22 ;; GNU General Public License for more details.
  23
  24 ;; You should have received a copy of the GNU General Public License
  25 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  26
  27 ;;; Commentary:
  28
  29 ;;; Code:
  30
  31 ;; For Emacs <22.2 and XEmacs.
  32 (eval-and-compile
  33   (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
  34
  35 (require 'nnheader)
  36 (require 'message)
  37 (require 'nnmail)
  38 (require 'nnoo)
  39 (eval-when-compile (require 'cl))
  40 (require 'gnus)
  41 (require 'gnus-util)
  42 (require 'gnus-range)
  43
  44 ;; FIXME not explicitly used in this file.
  45 (autoload 'gnus-article-unpropagatable-p "gnus-sum")
  46
  47 (nnoo-declare nnfolder)
  48
  49 (defvoo nnfolder-directory (expand-file-name message-directory)
  50   "The name of the nnfolder directory.")
  51
  52 (defvoo nnfolder-nov-directory nil
  53   "The name of the nnfolder NOV directory.
  54 If nil, `nnfolder-directory' is used.")
  55
  56 (defvoo nnfolder-active-file
  57     (nnheader-concat nnfolder-directory "active")
  58   "The name of the active file.")
  59
  60 ;; I renamed this variable to something more in keeping with the general GNU
  61 ;; style. -SLB
  62
  63 (defvoo nnfolder-ignore-active-file nil
  64   "If non-nil, the active file is ignored.
  65 This causes nnfolder to do some extra work in order to determine the
  66 true active ranges of an mbox file.  Note that the active file is
  67 still saved, but its values are not used.  This costs some extra time
  68 when scanning an mbox when opening it.")
  69
  70 (defvoo nnfolder-distrust-mbox nil
  71   "If non-nil, the folder will be distrusted.
  72 This means that nnfolder will not trust the user with respect to
  73 inserting unaccounted for mail in the middle of an mbox file.  This
  74 can greatly slow down scans, which now must scan the entire file for
  75 unmarked messages.  When nil, scans occur forward from the last marked
  76 message, a huge time saver for large mailboxes.")
  77
  78 (defvoo nnfolder-newsgroups-file
  79     (concat (file-name-as-directory nnfolder-directory) "newsgroups")
  80   "Mail newsgroups description file.")
  81
  82 (defvoo nnfolder-get-new-mail t
  83   "If non-nil, nnfolder will check the incoming mail file and split the mail.")
  84
  85 (defvoo nnfolder-prepare-save-mail-hook nil
  86   "Hook run narrowed to an article before saving.")
  87
  88 (defvoo nnfolder-save-buffer-hook nil
  89   "Hook run before saving the nnfolder mbox buffer.")
  90
  91
  92 (defvoo nnfolder-inhibit-expiry nil
  93   "If non-nil, inhibit expiry.")
  94
  95 \f
  96
  97 (defconst nnfolder-version "nnfolder 2.0"
  98   "nnfolder version.")
  99
 100 (defconst nnfolder-article-marker "X-Gnus-Article-Number: "
 101   "String used to demarcate what the article number for a message is.")
 102
 103 (defvoo nnfolder-current-group nil)
 104 (defvoo nnfolder-current-buffer nil)
 105 (defvoo nnfolder-status-string "")
 106 (defvoo nnfolder-group-alist nil)
 107 (defvoo nnfolder-buffer-alist nil)
 108 (defvoo nnfolder-scantime-alist nil)
 109 (defvoo nnfolder-active-timestamp nil)
 110 (defvoo nnfolder-active-file-coding-system mm-text-coding-system)
 111 (defvoo nnfolder-active-file-coding-system-for-write
 112     nnmail-active-file-coding-system)
 113 (defvoo nnfolder-file-coding-system mm-text-coding-system)
 114 (defvoo nnfolder-file-coding-system-for-write nnheader-file-coding-system
 115   "Coding system for save nnfolder file.
 116 if nil, `nnfolder-file-coding-system' is used.") ; FIXME: fill-in the doc-string of this variable
 117
 118 (defvoo nnfolder-nov-is-evil nil
 119   "If non-nil, Gnus will never generate and use nov databases for mail groups.
 120 Using nov databases will speed up header fetching considerably.
 121 This variable shouldn't be flipped much.  If you have, for some reason,
 122 set this to t, and want to set it to nil again, you should always run
 123 the `nnfolder-generate-active-file' command.  The function will go
 124 through all nnfolder directories and generate nov databases for them
 125 all.  This may very well take some time.")
 126
 127 (defvoo nnfolder-nov-file-suffix ".nov")
 128
 129 (defvoo nnfolder-nov-buffer-alist nil)
 130
 131 (defvar nnfolder-nov-buffer-file-name nil)
 132
 133 \f
 134
 135 ;;; Interface functions
 136
 137 (nnoo-define-basics nnfolder)
 138
 139 (deffoo nnfolder-retrieve-headers (articles &optional group server fetch-old)
 140   (with-current-buffer nntp-server-buffer
 141     (erase-buffer)
 142     (let (article start stop num)
 143       (nnfolder-possibly-change-group group server)
 144       (when nnfolder-current-buffer
 145         (set-buffer nnfolder-current-buffer)
 146         (goto-char (point-min))
 147         (if (stringp (car articles))
 148             'headers
 149           (if (nnfolder-retrieve-headers-with-nov articles fetch-old)
 150               'nov
 151             (setq articles (gnus-sorted-intersection
 152                             ;; Is ARTICLES sorted?
 153                             (sort articles '<)
 154                             (nnfolder-existing-articles)))
 155             (while (setq article (pop articles))
 156               (set-buffer nnfolder-current-buffer)
 157               (cond ((nnfolder-goto-article article)
 158                      (setq start (point))
 159                      (setq stop (if (search-forward "\n\n" nil t)
 160                                     (1- (point))
 161                                   (point-max)))
 162                      (set-buffer nntp-server-buffer)
 163                      (insert (format "221 %d Article retrieved.\n" article))
 164                      (insert-buffer-substring nnfolder-current-buffer
 165                                               start stop)
 166                      (goto-char (point-max))
 167                      (insert ".\n"))
 168
 169                     ;; If we couldn't find this article, skip over ranges
 170                     ;; of missing articles so we don't search the whole file
 171                     ;; for each of them.
 172                     ((numberp article)
 173                      (setq start (point))
 174                      (and
 175                       ;; Check that we are either at BOF or after an
 176                       ;; article with a lower number.  We do this so we
 177                       ;; won't be confused by out-of-order article numbers,
 178                       ;; as caused by active file bogosity.
 179                       (cond
 180                        ((bobp))
 181                        ((search-backward (concat "\n" nnfolder-article-marker)
 182                                          nil t)
 183                         (goto-char (match-end 0))
 184                         (setq num (string-to-number
 185                                    (buffer-substring
 186                                     (point) (point-at-eol))))
 187                         (goto-char start)
 188                         (< num article)))
 189                       ;; Check that we are before an article with a
 190                       ;; higher number.
 191                       (search-forward (concat "\n" nnfolder-article-marker)
 192                                       nil t)
 193                       (progn
 194                         (setq num (string-to-number
 195                                    (buffer-substring
 196                                     (point) (point-at-eol))))
 197                         (> num article))
 198                       ;; Discard any article numbers before the one we're
 199                       ;; now looking at.
 200                       (while (and articles
 201                                   (< (car articles) num))
 202                         (setq articles (cdr articles))))
 203                      (goto-char start))))
 204             (set-buffer nntp-server-buffer)
 205             (nnheader-fold-continuation-lines)
 206             'headers))))))
 207
 208 (deffoo nnfolder-open-server (server &optional defs)
 209   (nnoo-change-server 'nnfolder server defs)
 210   (nnmail-activate 'nnfolder t)
 211   (gnus-make-directory nnfolder-directory)
 212   (unless (or gnus-nov-is-evil nnfolder-nov-is-evil)
 213     (and nnfolder-nov-directory
 214          (gnus-make-directory nnfolder-nov-directory)))
 215   (cond
 216    ((not (file-exists-p nnfolder-directory))
 217     (nnfolder-close-server)
 218     (nnheader-report 'nnfolder "Couldn't create directory: %s"
 219                      nnfolder-directory))
 220    ((not (file-directory-p (file-truename nnfolder-directory)))
 221     (nnfolder-close-server)
 222     (nnheader-report 'nnfolder "Not a directory: %s" nnfolder-directory))
 223    (t
 224     (nnmail-activate 'nnfolder)
 225     (nnheader-report 'nnfolder "Opened server %s using directory %s"
 226                      server nnfolder-directory)
 227     t)))
 228
 229 (deffoo nnfolder-request-close ()
 230   (let ((alist nnfolder-buffer-alist))
 231     (while alist
 232       (nnfolder-close-group (caar alist) nil t)
 233       (setq alist (cdr alist))))
 234   (nnoo-close-server 'nnfolder)
 235   (setq nnfolder-buffer-alist nil
 236         nnfolder-group-alist nil))
 237
 238 (deffoo nnfolder-request-article (article &optional group server buffer)
 239   (nnfolder-possibly-change-group group server)
 240   (with-current-buffer nnfolder-current-buffer
 241     (goto-char (point-min))
 242     (when (nnfolder-goto-article article)
 243       (let (start stop)
 244         (setq start (point))
 245         (forward-line 1)
 246         (unless (and (nnmail-search-unix-mail-delim)
 247                      (forward-line -1))
 248           (goto-char (point-max)))
 249         (setq stop (point))
 250         (let ((nntp-server-buffer (or buffer nntp-server-buffer)))
 251           (set-buffer nntp-server-buffer)
 252           (erase-buffer)
 253           (insert-buffer-substring nnfolder-current-buffer start stop)
 254           (goto-char (point-min))
 255           (while (looking-at "From ")
 256             (delete-char 5)
 257             (insert "X-From-Line: ")
 258             (forward-line 1))
 259           (if (numberp article)
 260               (cons nnfolder-current-group article)
 261             (goto-char (point-min))
 262             (cons nnfolder-current-group
 263                   (if (search-forward (concat "\n" nnfolder-article-marker)
 264                                       nil t)
 265                       (string-to-number (buffer-substring
 266                                       (point) (point-at-eol)))
 267                     -1))))))))
 268
 269 (deffoo nnfolder-request-group (group &optional server dont-check info)
 270   (nnfolder-possibly-change-group group server t)
 271   (save-excursion
 272     (cond ((not (assoc group nnfolder-group-alist))
 273            (nnheader-report 'nnfolder "No such group: %s" group))
 274           ((file-directory-p (nnfolder-group-pathname group))
 275            (nnheader-report 'nnfolder "%s is a directory"
 276                             (file-name-as-directory
 277                              (let ((nnmail-pathname-coding-system nil))
 278                                (nnfolder-group-pathname group)))))
 279           (dont-check
 280            (nnheader-report 'nnfolder "Selected group %s" group)
 281            t)
 282           (t
 283            (let* ((active (assoc group nnfolder-group-alist))
 284                   (group (car active))
 285                   (range (cadr active)))
 286              (cond
 287               ((null active)
 288                (nnheader-report 'nnfolder "No such group: %s" group))
 289               ((null nnfolder-current-group)
 290                (nnheader-report 'nnfolder "Empty group: %s" group))
 291               (t
 292                (nnheader-report 'nnfolder "Selected group %s" group)
 293                (nnheader-insert "211 %d %d %d %s\n"
 294                                 (1+ (- (cdr range) (car range)))
 295                                 (car range) (cdr range) group))))))))
 296
 297 (deffoo nnfolder-request-scan (&optional group server)
 298   (nnfolder-possibly-change-group nil server)
 299   (when nnfolder-get-new-mail
 300     (nnfolder-possibly-change-group group server)
 301     (nnmail-get-new-mail
 302      'nnfolder 'nnfolder-save-all-buffers
 303      nnfolder-directory group)))
 304
 305 (defun nnfolder-save-all-buffers ()
 306   (let ((bufs nnfolder-buffer-alist))
 307     (save-excursion
 308       (while bufs
 309         (if (not (gnus-buffer-live-p (nth 1 (car bufs))))
 310             (setq nnfolder-buffer-alist
 311                   (delq (car bufs) nnfolder-buffer-alist))
 312           (set-buffer (nth 1 (car bufs)))
 313           (nnfolder-save-buffer)
 314           (kill-buffer (current-buffer)))
 315         (setq bufs (cdr bufs))))))
 316
 317 ;; Don't close the buffer if we're not shutting down the server.  This way,
 318 ;; we can keep the buffer in the group buffer cache, and not have to grovel
 319 ;; over the buffer again unless we add new mail to it or modify it in some
 320 ;; way.
 321
 322 (deffoo nnfolder-close-group (group &optional server force)
 323   ;; Make sure we _had_ the group open.
 324   (when (or (assoc group nnfolder-buffer-alist)
 325             (equal group nnfolder-current-group))
 326     (let ((inf (assoc group nnfolder-buffer-alist)))
 327       (when inf
 328         (when (and nnfolder-current-group
 329                    nnfolder-current-buffer)
 330           (push (list nnfolder-current-group nnfolder-current-buffer)
 331                 nnfolder-buffer-alist))
 332         (setq nnfolder-buffer-alist
 333               (delq inf nnfolder-buffer-alist))
 334         (setq nnfolder-current-buffer (cadr inf)
 335               nnfolder-current-group (car inf))))
 336     (when (and nnfolder-current-buffer
 337                (buffer-name nnfolder-current-buffer))
 338       (with-current-buffer nnfolder-current-buffer
 339         ;; If the buffer was modified, write the file out now.
 340         (nnfolder-save-buffer)
 341         ;; If we're shutting the server down, we need to kill the
 342         ;; buffer and remove it from the open buffer list.  Or, of
 343         ;; course, if we're trying to minimize our space impact.
 344         (kill-buffer (current-buffer))
 345         (setq nnfolder-buffer-alist (delq (assoc group nnfolder-buffer-alist)
 346                                           nnfolder-buffer-alist)))))
 347   (setq nnfolder-current-group nil
 348         nnfolder-current-buffer nil)
 349   t)
 350
 351 (deffoo nnfolder-request-create-group (group &optional server args)
 352   (nnfolder-possibly-change-group nil server)
 353   (nnmail-activate 'nnfolder)
 354   (cond ((zerop (length group))
 355          (nnheader-report 'nnfolder "Invalid (empty) group name"))
 356         ((file-directory-p (nnfolder-group-pathname group))
 357          (nnheader-report 'nnfolder "%s is a directory"
 358                           (file-name-as-directory
 359                            (let ((nnmail-pathname-coding-system nil))
 360                              (nnfolder-group-pathname group)))))
 361         ((assoc group nnfolder-group-alist)
 362          t)
 363         (t
 364          (push (list group (cons 1 0)) nnfolder-group-alist)
 365          (nnfolder-save-active nnfolder-group-alist nnfolder-active-file)
 366          (save-current-buffer
 367            (nnfolder-read-folder group))
 368          t)))
 369
 370 (deffoo nnfolder-request-list (&optional server)
 371   (nnfolder-possibly-change-group nil server)
 372   (save-excursion
 373     (let ((nnmail-file-coding-system nnfolder-active-file-coding-system))
 374       (nnmail-find-file nnfolder-active-file)
 375       (setq nnfolder-group-alist (nnmail-get-active)))
 376     t))
 377
 378 (deffoo nnfolder-request-newgroups (date &optional server)
 379   (nnfolder-possibly-change-group nil server)
 380   (nnfolder-request-list server))
 381
 382 (deffoo nnfolder-request-list-newsgroups (&optional server)
 383   (nnfolder-possibly-change-group nil server)
 384   (save-excursion
 385     (let ((nnmail-file-coding-system nnfolder-file-coding-system))
 386       (nnmail-find-file nnfolder-newsgroups-file))))
 387
 388 ;; Return a list consisting of all article numbers existing in the
 389 ;; current folder.
 390
 391 (defun nnfolder-existing-articles ()
 392   (save-excursion
 393     (when nnfolder-current-buffer
 394       (set-buffer nnfolder-current-buffer)
 395       (goto-char (point-min))
 396       (let ((marker (concat "\n" nnfolder-article-marker))
 397             (number "[0-9]+")
 398             numbers)
 399         (while (and (search-forward marker nil t)
 400                     (re-search-forward number nil t))
 401           (let ((newnum (string-to-number (match-string 0))))
 402             (if (nnmail-within-headers-p)
 403                 (push newnum numbers))))
 404       ;; The article numbers are increasing, so this result is sorted.
 405         (nreverse numbers)))))
 406
 407 (autoload 'gnus-request-group "gnus-int")
 408 (declare-function gnus-request-create-group "gnus-int"
 409                   (group &optional gnus-command-method args))
 410
 411 (deffoo nnfolder-request-expire-articles (articles newsgroup
 412                                                    &optional server force)
 413   (nnfolder-possibly-change-group newsgroup server)
 414   (let ((is-old t)
 415         ;; The articles we have deleted so far.
 416         (deleted-articles nil)
 417         ;; The articles that really exist and will
 418         ;; be expired if they are old enough.
 419         (maybe-expirable
 420          (gnus-sorted-intersection articles (nnfolder-existing-articles)))
 421         target)
 422     (nnmail-activate 'nnfolder)
 423
 424     (with-current-buffer nnfolder-current-buffer
 425       ;; Since messages are sorted in arrival order and expired in the
 426       ;; same order, we can stop as soon as we find a message that is
 427       ;; too old.
 428       (while (and maybe-expirable is-old)
 429         (goto-char (point-min))
 430         (when (and (nnfolder-goto-article (car maybe-expirable))
 431                    (search-forward (concat "\n" nnfolder-article-marker)
 432                                    nil t))
 433           (forward-sexp)
 434           (when (setq is-old
 435                       (nnmail-expired-article-p
 436                        newsgroup
 437                        (buffer-substring
 438                         (point) (progn (end-of-line) (point)))
 439                        force nnfolder-inhibit-expiry))
 440             (setq target nnmail-expiry-target)
 441             (unless (eq target 'delete)
 442               (with-temp-buffer
 443                 (nnfolder-request-article (car maybe-expirable)
 444                                           newsgroup server (current-buffer))
 445                 (let ((nnfolder-current-directory nil))
 446                   (when (functionp target)
 447                     (setq target (funcall target newsgroup)))
 448                   (when (and target (not (eq target 'delete)))
 449                     (if (or (gnus-request-group target)
 450                             (gnus-request-create-group target))
 451                         (nnmail-expiry-target-group target newsgroup)
 452                       (setq target nil)))))
 453               (nnfolder-possibly-change-group newsgroup server))
 454             (when target
 455               (nnheader-message 5 "Deleting article %d in %s..."
 456                                 (car maybe-expirable) newsgroup)
 457               (nnfolder-delete-mail)
 458               (unless (or gnus-nov-is-evil nnfolder-nov-is-evil)
 459                 (nnfolder-nov-delete-article newsgroup (car maybe-expirable)))
 460               ;; Must remember which articles were actually deleted
 461               (push (car maybe-expirable) deleted-articles))))
 462         (setq maybe-expirable (cdr maybe-expirable)))
 463       (unless nnfolder-inhibit-expiry
 464         (nnheader-message 5 "Deleting articles...done"))
 465       (nnfolder-save-buffer)
 466       (nnfolder-adjust-min-active newsgroup)
 467       (nnfolder-save-active nnfolder-group-alist nnfolder-active-file)
 468       (nnfolder-save-all-buffers)
 469       (gnus-sorted-difference articles (nreverse deleted-articles)))))
 470
 471 (deffoo nnfolder-request-move-article (article group server accept-form
 472                                                &optional last move-is-internal)
 473   (save-excursion
 474     (let ((buf (get-buffer-create " *nnfolder move*"))
 475           result)
 476       (and
 477        (nnfolder-request-article article group server)
 478        (with-current-buffer buf
 479          (erase-buffer)
 480          (insert-buffer-substring nntp-server-buffer)
 481          (goto-char (point-min))
 482          (while (re-search-forward
 483                  (concat "^" nnfolder-article-marker)
 484                  (save-excursion (and (search-forward "\n\n" nil t) (point)))
 485                  t)
 486            (gnus-delete-line))
 487          (setq result (eval accept-form))
 488          (kill-buffer buf)
 489          result)
 490        (save-excursion
 491          (nnfolder-possibly-change-group group server)
 492          (set-buffer nnfolder-current-buffer)
 493          (goto-char (point-min))
 494          (when (nnfolder-goto-article article)
 495            (nnfolder-delete-mail))
 496          (unless (or gnus-nov-is-evil nnfolder-nov-is-evil)
 497            (nnfolder-nov-delete-article group article))
 498          (when last
 499            (nnfolder-save-buffer)
 500            (nnfolder-adjust-min-active group)
 501            (nnfolder-save-active nnfolder-group-alist nnfolder-active-file))))
 502       result)))
 503
 504 (deffoo nnfolder-request-accept-article (group &optional server last)
 505   (save-excursion
 506     (nnfolder-possibly-change-group group server)
 507     (nnmail-check-syntax)
 508     (let ((buf (current-buffer))
 509           result art-group)
 510       (goto-char (point-min))
 511       (when (looking-at "X-From-Line: ")
 512         (replace-match "From ")
 513         (while (progn (forward-line) (looking-at "[ \t]"))
 514           (delete-char -1)))
 515       (with-temp-buffer
 516         (let ((nnmail-file-coding-system nnfolder-active-file-coding-system)
 517               (nntp-server-buffer (current-buffer)))
 518           (nnmail-find-file nnfolder-active-file)
 519           (setq nnfolder-group-alist (nnmail-parse-active))))
 520       (save-excursion
 521         (goto-char (point-min))
 522         (if (search-forward "\n\n" nil t)
 523             (forward-line -1)
 524           (goto-char (point-max)))
 525         (while (re-search-backward (concat "^" nnfolder-article-marker) nil t)
 526           (delete-region (point) (progn (forward-line 1) (point))))
 527         (when nnmail-cache-accepted-message-ids
 528           (nnmail-cache-insert (nnmail-fetch-field "message-id")
 529                                group
 530                                (nnmail-fetch-field "subject")
 531                                (nnmail-fetch-field "from")))
 532         (setq result (if (stringp group)
 533                          (list (cons group (nnfolder-active-number group)))
 534                        (setq art-group
 535                              (nnmail-article-group 'nnfolder-active-number))))
 536         (if (and (null result)
 537                  (yes-or-no-p "Moved to `junk' group; delete article? "))
 538             (setq result 'junk)
 539           (setq result
 540                 (car (nnfolder-save-mail result)))))
 541       (when last
 542         (save-excursion
 543           (nnfolder-possibly-change-folder (or (caar art-group) group))
 544           (nnfolder-save-buffer)
 545           (when nnmail-cache-accepted-message-ids
 546             (nnmail-cache-close))))
 547       (nnfolder-save-active nnfolder-group-alist nnfolder-active-file)
 548       (unless result
 549         (nnheader-report 'nnfolder "Couldn't store article"))
 550       result)))
 551
 552 (deffoo nnfolder-request-replace-article (article group buffer)
 553   (nnfolder-possibly-change-group group)
 554   (with-current-buffer buffer
 555     (goto-char (point-min))
 556     (if (not (looking-at "X-From-Line: "))
 557         (insert "From nobody " (current-time-string) "\n")
 558       (replace-match "From ")
 559       (forward-line 1)
 560       (while (looking-at "[ \t]")
 561         (delete-char -1)
 562         (forward-line 1)))
 563     (nnfolder-normalize-buffer)
 564     (set-buffer nnfolder-current-buffer)
 565     (goto-char (point-min))
 566     (if (not (nnfolder-goto-article article))
 567         nil
 568       (nnfolder-delete-mail)
 569       (insert-buffer-substring buffer)
 570       (unless (or gnus-nov-is-evil nnfolder-nov-is-evil)
 571         (with-current-buffer buffer
 572           (let ((headers (nnfolder-parse-head article
 573                                               (point-min) (point-max))))
 574             (with-current-buffer (nnfolder-open-nov group)
 575               (if (nnheader-find-nov-line article)
 576                   (delete-region (point) (progn (forward-line 1) (point))))
 577               (nnheader-insert-nov headers)))))
 578       (nnfolder-save-buffer)
 579       t)))
 580
 581 (deffoo nnfolder-request-delete-group (group &optional force server)
 582   (nnfolder-close-group group server t)
 583   ;; Delete all articles in GROUP.
 584   (if (not force)
 585       ()                                ; Don't delete the articles.
 586     ;; Delete the file that holds the group.
 587     (let ((data (nnfolder-group-pathname group))
 588           (nov (nnfolder-group-nov-pathname group)))
 589       (ignore-errors (delete-file data))
 590       (ignore-errors (delete-file nov))))
 591   ;; Remove the group from all structures.
 592   (setq nnfolder-group-alist
 593         (delq (assoc group nnfolder-group-alist) nnfolder-group-alist)
 594         nnfolder-current-group nil
 595         nnfolder-current-buffer nil)
 596   ;; Save the active file.
 597   (nnfolder-save-active nnfolder-group-alist nnfolder-active-file)
 598   t)
 599
 600 (deffoo nnfolder-request-rename-group (group new-name &optional server)
 601   (nnfolder-possibly-change-group group server)
 602   (with-current-buffer nnfolder-current-buffer
 603     (and (file-writable-p buffer-file-name)
 604          (ignore-errors
 605            (let ((new-file (nnfolder-group-pathname new-name)))
 606              (gnus-make-directory (file-name-directory new-file))
 607              (rename-file buffer-file-name new-file)
 608              (when (file-exists-p (nnfolder-group-nov-pathname group))
 609                (setq new-file (nnfolder-group-nov-pathname new-name))
 610                (gnus-make-directory (file-name-directory new-file))
 611                (rename-file (nnfolder-group-nov-pathname group) new-file)))
 612            t)
 613          ;; That went ok, so we change the internal structures.
 614          (let ((entry (assoc group nnfolder-group-alist)))
 615            (and entry (setcar entry new-name))
 616            (setq nnfolder-current-buffer nil
 617                  nnfolder-current-group nil)
 618            ;; Save the new group alist.
 619            (nnfolder-save-active nnfolder-group-alist nnfolder-active-file)
 620            ;; We kill the buffer instead of renaming it and stuff.
 621            (kill-buffer (current-buffer))
 622            t))))
 623
 624 (deffoo nnfolder-request-regenerate (server)
 625   (nnfolder-possibly-change-group nil server)
 626   (nnfolder-generate-active-file)
 627   t)
 628
 629 \f
 630 ;;; Internal functions.
 631
 632 (defun nnfolder-adjust-min-active (group)
 633   ;; Find the lowest active article in this group.
 634   (let* ((active (cadr (assoc group nnfolder-group-alist)))
 635          (marker (concat "\n" nnfolder-article-marker))
 636          (number "[0-9]+")
 637          (activemin (cdr active)))
 638     (with-current-buffer nnfolder-current-buffer
 639       (goto-char (point-min))
 640       (while (and (search-forward marker nil t)
 641                   (re-search-forward number nil t))
 642         (let ((newnum (string-to-number (match-string 0))))
 643           (if (nnmail-within-headers-p)
 644               (setq activemin (min activemin newnum)))))
 645       (setcar active activemin))))
 646
 647 (defun nnfolder-article-string (article)
 648   (if (numberp article)
 649       (concat "\n" nnfolder-article-marker (int-to-string article) " ")
 650     (concat "\nMessage-ID: " article)))
 651
 652 (defun nnfolder-goto-article (article)
 653   "Place point at the start of the headers of ARTICLE.
 654 ARTICLE can be an article number or a Message-ID.
 655 Returns t if successful, nil otherwise."
 656   (let ((art-string (nnfolder-article-string article))
 657         start found)
 658     ;; It is likely that we are at or before the delimiter line.
 659     ;; We therefore go to the end of the previous line, and start
 660     ;; searching from there.
 661     (beginning-of-line)
 662     (unless (bobp)
 663       (forward-char -1))
 664     (setq start (point))
 665     ;; First search forward.
 666     (while (and (setq found (search-forward art-string nil t))
 667                 (not (nnmail-within-headers-p))))
 668     ;; If unsuccessful, search backward from where we started,
 669     (unless found
 670       (goto-char start)
 671       (while (and (setq found (search-backward art-string nil t))
 672                   (not (nnmail-within-headers-p)))))
 673     (when found
 674       (nnmail-search-unix-mail-delim-backward))))
 675
 676 (defun nnfolder-delete-mail (&optional leave-delim)
 677   "Delete the message that point is in.
 678 If optional argument LEAVE-DELIM is t, then mailbox delimiter is not
 679 deleted.  Point is left where the deleted region was."
 680   (save-restriction
 681     (narrow-to-region
 682      (save-excursion
 683        ;; In case point is at the beginning of the message already.
 684        (forward-line 1)
 685        (nnmail-search-unix-mail-delim-backward)
 686        (if leave-delim (progn (forward-line 1) (point))
 687          (point)))
 688      (progn
 689        (forward-line 1)
 690        (if (nnmail-search-unix-mail-delim)
 691            (point)
 692          (point-max))))
 693     (run-hooks 'nnfolder-delete-mail-hook)
 694     (delete-region (point-min) (point-max))))
 695
 696 (defun nnfolder-possibly-change-group (group &optional server dont-check)
 697   ;; Change servers.
 698   (when (and server
 699              (not (nnfolder-server-opened server)))
 700     (nnfolder-open-server server))
 701   (unless (gnus-buffer-live-p nnfolder-current-buffer)
 702     (setq nnfolder-current-buffer nil
 703           nnfolder-current-group nil))
 704   ;; Change group.
 705   (let ((file-name-coding-system nnmail-pathname-coding-system))
 706     (when (and group
 707                (not (equal group nnfolder-current-group))
 708                (progn
 709                  (nnmail-activate 'nnfolder)
 710                  (and (assoc group nnfolder-group-alist)
 711                       (file-exists-p (nnfolder-group-pathname group)))))
 712       (if dont-check
 713           (setq nnfolder-current-group group
 714                 nnfolder-current-buffer nil)
 715         (let (inf file)
 716           ;; If we have to change groups, see if we don't already have
 717           ;; the folder in memory.  If we do, verify the modtime and
 718           ;; destroy the folder if needed so we can rescan it.
 719           (setq nnfolder-current-buffer
 720                 (nth 1 (assoc group nnfolder-buffer-alist)))
 721
 722           ;; If the buffer is not live, make sure it isn't in the
 723           ;; alist.  If it is live, verify that nobody else has
 724           ;; touched the file since last time.
 725           (when (and nnfolder-current-buffer
 726                      (not (gnus-buffer-live-p nnfolder-current-buffer)))
 727             (setq nnfolder-buffer-alist (delq inf nnfolder-buffer-alist)
 728                   nnfolder-current-buffer nil))
 729
 730           (setq nnfolder-current-group group)
 731
 732           (when (or (not nnfolder-current-buffer)
 733                     (not (verify-visited-file-modtime
 734                           nnfolder-current-buffer)))
 735             (save-excursion
 736               (setq file (nnfolder-group-pathname group))
 737               ;; See whether we need to create the new file.
 738               (unless (file-exists-p file)
 739                 (gnus-make-directory (file-name-directory file))
 740                 (let ((nnmail-file-coding-system
 741                        (or nnfolder-file-coding-system-for-write
 742                            nnfolder-file-coding-system-for-write)))
 743                   (nnmail-write-region (point-min) (point-min)
 744                                        file t 'nomesg)))
 745               (when (setq nnfolder-current-buffer (nnfolder-read-folder group))
 746                 (set-buffer nnfolder-current-buffer)
 747                 (push (list group nnfolder-current-buffer)
 748                       nnfolder-buffer-alist)))))))))
 749
 750 (defun nnfolder-save-mail (group-art-list)
 751   "Called narrowed to an article."
 752   (let* (save-list group-art)
 753     (goto-char (point-min))
 754     ;; The From line may have been quoted by movemail.
 755     (when (looking-at ">From")
 756       (delete-char 1))
 757     ;; This might come from somewhere else.
 758     (unless (looking-at "From ")
 759       (insert "From nobody " (current-time-string) "\n")
 760       (goto-char (point-min)))
 761     ;; Quote all "From " lines in the article.
 762     (forward-line 1)
 763     (let (case-fold-search)
 764       (while (re-search-forward "^From " nil t)
 765         (beginning-of-line)
 766         (insert "> ")))
 767     (setq save-list group-art-list)
 768     (nnmail-insert-lines)
 769     (nnmail-insert-xref group-art-list)
 770     (run-hooks 'nnmail-prepare-save-mail-hook)
 771     (run-hooks 'nnfolder-prepare-save-mail-hook)
 772
 773     ;; Insert the mail into each of the destination groups.
 774     (while (setq group-art (pop group-art-list))
 775       ;; Kill any previous newsgroup markers.
 776       (goto-char (point-min))
 777       (if (search-forward "\n\n" nil t)
 778           (forward-line -1)
 779         (goto-char (point-max)))
 780       (while (search-backward (concat "\n" nnfolder-article-marker) nil t)
 781         (delete-region (1+ (point)) (progn (forward-line 2) (point))))
 782
 783       ;; Insert the new newsgroup marker.
 784       (nnfolder-insert-newsgroup-line group-art)
 785
 786       (save-excursion
 787         (let ((beg (point-min))
 788               (end (point-max))
 789               (obuf (current-buffer)))
 790           (nnfolder-possibly-change-folder (car group-art))
 791           (let ((buffer-read-only nil))
 792             (nnfolder-normalize-buffer)
 793             (insert-buffer-substring obuf beg end))
 794           (unless (or gnus-nov-is-evil nnfolder-nov-is-evil)
 795             (set-buffer obuf)
 796             (nnfolder-add-nov (car group-art) (cdr group-art)
 797                               (nnfolder-parse-head nil beg end))))))
 798
 799     ;; Did we save it anywhere?
 800     save-list))
 801
 802 (defun nnfolder-normalize-buffer ()
 803   "Make sure there are two newlines at the end of the buffer."
 804   (goto-char (point-max))
 805   (skip-chars-backward "\n")
 806   (delete-region (point) (point-max))
 807   (unless (bobp)
 808     (insert "\n\n")))
 809
 810 (defun nnfolder-insert-newsgroup-line (group-art)
 811   (save-excursion
 812     (goto-char (point-min))
 813     (unless (search-forward "\n\n" nil t)
 814       (goto-char (point-max))
 815       (insert "\n"))
 816     (forward-char -1)
 817     (insert (format (concat nnfolder-article-marker "%d   %s\n")
 818                     (cdr group-art) (message-make-date)))))
 819
 820 (defun nnfolder-active-number (group)
 821   ;; Find the next article number in GROUP.
 822   (let ((active (cadr (assoc group nnfolder-group-alist))))
 823     (if active
 824         (setcdr active (1+ (cdr active)))
 825       ;; This group is new, so we create a new entry for it.
 826       ;; This might be a bit naughty... creating groups on the drop of
 827       ;; a hat, but I don't know...
 828       (push (list group (setq active (cons 1 1)))
 829             nnfolder-group-alist))
 830     (cdr active)))
 831
 832 (defun nnfolder-possibly-change-folder (group)
 833   (let ((inf (assoc group nnfolder-buffer-alist)))
 834     (if (and inf
 835              (gnus-buffer-live-p (cadr inf)))
 836         (set-buffer (cadr inf))
 837       (when inf
 838         (setq nnfolder-buffer-alist (delq inf nnfolder-buffer-alist)))
 839       (when nnfolder-group-alist
 840         (nnfolder-save-active nnfolder-group-alist nnfolder-active-file))
 841       (push (list group (nnfolder-read-folder group))
 842             nnfolder-buffer-alist))))
 843
 844 ;; This method has a problem if you've accidentally let the active
 845 ;; list get out of sync with the files.  This could happen, say, if
 846 ;; you've accidentally gotten new mail with something other than Gnus
 847 ;; (but why would _that_ ever happen? :-).  In that case, we will be
 848 ;; in the middle of processing the file, ready to add new X-Gnus
 849 ;; article number markers, and we'll run across a message with no ID
 850 ;; yet - the active list _may_not_ be ready for us yet.
 851
 852 ;; To handle this, I'm modifying this routine to maintain the maximum
 853 ;; ID seen so far, and when we hit a message with no ID, we will
 854 ;; _manually_ scan the rest of the message looking for any more,
 855 ;; possibly higher IDs.  We'll assume the maximum that we find is the
 856 ;; highest active.  Note that this shouldn't cost us much extra time
 857 ;; at all, but will be a lot less vulnerable to glitches between the
 858 ;; mbox and the active file.
 859
 860 (defun nnfolder-read-folder (group)
 861   (let* ((file (nnfolder-group-pathname group))
 862          (nov  (nnfolder-group-nov-pathname group))
 863          (buffer (set-buffer
 864                   (let ((nnheader-file-coding-system
 865                          nnfolder-file-coding-system))
 866                     (nnheader-find-file-noselect file t)))))
 867     (mm-enable-multibyte) ;; Use multibyte buffer for future copying.
 868     (buffer-disable-undo)
 869     (if (equal (cadr (assoc group nnfolder-scantime-alist))
 870                (nth 5 (file-attributes file)))
 871         ;; This looks up-to-date, so we don't do any scanning.
 872         (if (file-exists-p file)
 873             buffer
 874           (push (list group buffer) nnfolder-buffer-alist)
 875           (set-buffer-modified-p t)
 876           (nnfolder-save-buffer))
 877       ;; Parse the damn thing.
 878       (save-excursion
 879         (goto-char (point-min))
 880         ;; Remove any blank lines at the start.
 881         (while (eq (following-char) ?\n)
 882           (delete-char 1))
 883         (nnmail-activate 'nnfolder)
 884         ;; Read in the file.
 885         (let ((delim "^From ")
 886               (marker (concat "\n" nnfolder-article-marker))
 887               (number "[0-9]+")
 888               (active (or (cadr (assoc group nnfolder-group-alist))
 889                           (cons 1 0)))
 890               (scantime (assoc group nnfolder-scantime-alist))
 891               (minid (or (and (boundp 'most-positive-fixnum)
 892                               most-positive-fixnum)
 893                          (lsh -1 -1)))
 894               maxid start end newscantime
 895               novbuf articles newnum
 896               buffer-read-only)
 897           (setq maxid (cdr active))
 898
 899           (unless (or gnus-nov-is-evil nnfolder-nov-is-evil
 900                       (and (file-exists-p nov)
 901                            (file-newer-than-file-p nov file)))
 902             (unless (file-exists-p nov)
 903               (gnus-make-directory (file-name-directory nov)))
 904             (with-current-buffer
 905                 (setq novbuf (nnfolder-open-nov group))
 906               (goto-char (point-min))
 907               (while (not (eobp))
 908                 (push (read novbuf) articles)
 909                 (forward-line 1))
 910               (setq articles (nreverse articles))))
 911           (goto-char (point-min))
 912
 913           ;; Anytime the active number is 1 or 0, it is suspect.  In
 914           ;; that case, search the file manually to find the active
 915           ;; number.  Or, of course, if we're being paranoid.  (This
 916           ;; would also be the place to build other lists from the
 917           ;; header markers, such as expunge lists, etc., if we ever
 918           ;; desired to abandon the active file entirely for mboxes.)
 919           (when (or nnfolder-ignore-active-file
 920                     novbuf
 921                     (< maxid 2))
 922             (while (and (search-forward marker nil t)
 923                         (looking-at number))
 924               (setq newnum (string-to-number (match-string 0)))
 925               (when (nnmail-within-headers-p)
 926                 (setq maxid (max maxid newnum)
 927                       minid (min minid newnum))
 928                 (when novbuf
 929                   (if (memq newnum articles)
 930                       (setq articles (delq newnum articles))
 931                     (let ((headers (nnfolder-parse-head newnum)))
 932                       (with-current-buffer novbuf
 933                         (nnheader-find-nov-line newnum)
 934                         (nnheader-insert-nov headers)))))))
 935             (when (and novbuf articles)
 936               (with-current-buffer novbuf
 937                 (dolist (article articles)
 938                   (when (nnheader-find-nov-line article)
 939                     (delete-region (point)
 940                                    (progn (forward-line 1) (point)))))))
 941             (setcar active (max 1 (min minid maxid)))
 942             (setcdr active (max maxid (cdr active)))
 943             (goto-char (point-min)))
 944
 945           ;; As long as we trust that the user will only insert
 946           ;; unmarked mail at the end, go to the end and search
 947           ;; backwards for the last marker.  Find the start of that
 948           ;; message, and begin to search for unmarked messages from
 949           ;; there.
 950           (when (not (or nnfolder-distrust-mbox
 951                          (< maxid 2)))
 952             (goto-char (point-max))
 953             (unless (re-search-backward marker nil t)
 954               (goto-char (point-min)))
 955             ;;(when (nnmail-search-unix-mail-delim)
 956             ;;  (goto-char (point-min)))
 957             )
 958
 959           ;; Keep track of the active number on our own, and insert it
 960           ;; back into the active list when we're done.  Also, prime
 961           ;; the pump to cut down on the number of searches we do.
 962           (unless (nnmail-search-unix-mail-delim)
 963             (goto-char (point-max)))
 964           (setq end (point-marker))
 965           (while (not (= end (point-max)))
 966             (setq start (marker-position end))
 967             (goto-char end)
 968            ;; There may be more than one "From " line, so we skip past
 969             ;; them.
 970             (while (looking-at delim)
 971               (forward-line 1))
 972             (set-marker end (if (nnmail-search-unix-mail-delim)
 973                                 (point)
 974                               (point-max)))
 975             (goto-char start)
 976             (when (not (search-forward marker end t))
 977               (narrow-to-region start end)
 978               (nnmail-insert-lines)
 979               (nnfolder-insert-newsgroup-line
 980                (cons nil
 981                      (setq newnum
 982                            (nnfolder-active-number group))))
 983               (when novbuf
 984                 (let ((headers (nnfolder-parse-head newnum (point-min)
 985                                                     (point-max))))
 986                   (with-current-buffer novbuf
 987                     (goto-char (point-max))
 988                     (nnheader-insert-nov headers))))
 989               (widen)))
 990
 991           (set-marker end nil)
 992           ;; Make absolutely sure that the active list reflects
 993           ;; reality!
 994           (nnfolder-save-active nnfolder-group-alist nnfolder-active-file)
 995
 996           ;; Set the scantime for this group.
 997           (setq newscantime (visited-file-modtime))
 998           (if scantime
 999               (setcdr scantime (list newscantime))
1000             (push (list group newscantime)
1001                   nnfolder-scantime-alist))
1002           ;; Save nov.
1003           (when novbuf
1004             (nnfolder-save-nov))
1005           (current-buffer))))))
1006
1007 ;;;###autoload
1008 (defun nnfolder-generate-active-file ()
1009   "Look for mbox folders in the nnfolder directory and make them into groups.
1010 This command does not work if you use short group names."
1011   (interactive)
1012   (nnmail-activate 'nnfolder)
1013   (unless (or gnus-nov-is-evil nnfolder-nov-is-evil)
1014     (dolist (file (directory-files (or nnfolder-nov-directory
1015                                        nnfolder-directory)
1016                                    t
1017                                    (concat
1018                                     (regexp-quote nnfolder-nov-file-suffix)
1019                                     "$")))
1020       (when (not (message-mail-file-mbox-p file))
1021         (ignore-errors
1022           (delete-file file)))))
1023     (dolist (file (directory-files nnfolder-directory))
1024       (when (and (not (backup-file-name-p file))
1025                  (message-mail-file-mbox-p
1026                   (nnheader-concat nnfolder-directory file)))
1027         (let ((oldgroup (assoc file nnfolder-group-alist)))
1028           (if oldgroup
1029               (nnheader-message 5 "Refreshing group %s..." file)
1030             (nnheader-message 5 "Adding group %s..." file))
1031           (if oldgroup
1032               (setq nnfolder-group-alist
1033                     (delq oldgroup (copy-sequence nnfolder-group-alist))))
1034           (push (list file (cons 1 0)) nnfolder-group-alist)
1035           (nnfolder-possibly-change-folder file)
1036           (nnfolder-possibly-change-group file)
1037           (nnfolder-close-group file))))
1038     (nnheader-message 5 ""))
1039
1040 (defun nnfolder-group-pathname (group)
1041   "Make file name for GROUP."
1042   (setq group
1043         (mm-encode-coding-string group nnmail-pathname-coding-system))
1044   (let ((dir (file-name-as-directory (expand-file-name nnfolder-directory))))
1045     ;; If this file exists, we use it directly.
1046     (if (or nnmail-use-long-file-names
1047             (file-exists-p (concat dir group)))
1048         (concat dir group)
1049       ;; If not, we translate dots into slashes.
1050       (concat dir (nnheader-replace-chars-in-string group ?. ?/)))))
1051
1052 (defun nnfolder-group-nov-pathname (group)
1053   "Make pathname for GROUP NOV."
1054   (let ((nnfolder-directory
1055          (or nnfolder-nov-directory nnfolder-directory)))
1056     (concat (nnfolder-group-pathname group) nnfolder-nov-file-suffix)))
1057
1058 (defvar copyright-update)
1059
1060 (defun nnfolder-save-buffer ()
1061   "Save the buffer."
1062   (let ((delete-old-versions t))
1063     (when (buffer-modified-p)
1064       (run-hooks 'nnfolder-save-buffer-hook)
1065       (gnus-make-directory (file-name-directory (buffer-file-name)))
1066       (let ((coding-system-for-write
1067              (or nnfolder-file-coding-system-for-write
1068                  nnfolder-file-coding-system)))
1069         (set (make-local-variable 'copyright-update) nil)
1070         (save-buffer)))
1071     (unless (or gnus-nov-is-evil nnfolder-nov-is-evil)
1072       (nnfolder-save-nov))))
1073
1074 (defun nnfolder-save-active (group-alist active-file)
1075   (let ((nnmail-active-file-coding-system
1076          (or nnfolder-active-file-coding-system-for-write
1077              nnfolder-active-file-coding-system)))
1078     (nnmail-save-active group-alist active-file)))
1079
1080 (defun nnfolder-open-nov (group)
1081   (or (cdr (assoc group nnfolder-nov-buffer-alist))
1082       (let ((buffer (get-buffer-create (format " *nnfolder overview %s*" group))))
1083         (with-current-buffer buffer
1084           (set (make-local-variable 'nnfolder-nov-buffer-file-name)
1085                (nnfolder-group-nov-pathname group))
1086           (erase-buffer)
1087           (when (file-exists-p nnfolder-nov-buffer-file-name)
1088             (nnheader-insert-file-contents nnfolder-nov-buffer-file-name)))
1089         (push (cons group buffer) nnfolder-nov-buffer-alist)
1090         buffer)))
1091
1092 (defun nnfolder-save-nov ()
1093   (save-excursion
1094     (while nnfolder-nov-buffer-alist
1095       (when (buffer-name (cdar nnfolder-nov-buffer-alist))
1096         (set-buffer (cdar nnfolder-nov-buffer-alist))
1097         (when (buffer-modified-p)
1098           (gnus-make-directory (file-name-directory
1099                                 nnfolder-nov-buffer-file-name))
1100           (nnmail-write-region 1 (point-max) nnfolder-nov-buffer-file-name
1101                                nil 'nomesg))
1102         (set-buffer-modified-p nil)
1103         (kill-buffer (current-buffer)))
1104       (setq nnfolder-nov-buffer-alist (cdr nnfolder-nov-buffer-alist)))))
1105
1106 (defun nnfolder-nov-delete-article (group article)
1107   (with-current-buffer (nnfolder-open-nov group)
1108     (when (nnheader-find-nov-line article)
1109       (delete-region (point) (progn (forward-line 1) (point))))
1110     t))
1111
1112 (defun nnfolder-retrieve-headers-with-nov (articles &optional fetch-old)
1113   (if (or gnus-nov-is-evil nnfolder-nov-is-evil)
1114       nil
1115     (let ((nov (nnfolder-group-nov-pathname nnfolder-current-group)))
1116       (when (file-exists-p nov)
1117         (with-current-buffer nntp-server-buffer
1118           (erase-buffer)
1119           (nnheader-insert-file-contents nov)
1120           (if (and fetch-old
1121                    (not (numberp fetch-old)))
1122               t                         ; Don't remove anything.
1123             (nnheader-nov-delete-outside-range
1124              (if fetch-old (max 1 (- (car articles) fetch-old))
1125                (car articles))
1126              (car (last articles)))
1127             t))))))
1128
1129 (defun nnfolder-parse-head (&optional number b e)
1130   "Parse the head of the current buffer."
1131   (let ((buf (current-buffer))
1132         chars)
1133     (save-excursion
1134       (unless b
1135         (setq b (if (nnmail-search-unix-mail-delim-backward)
1136                     (point) (point-min)))
1137         (forward-line 1)
1138         (setq e (if (nnmail-search-unix-mail-delim)
1139                     (point) (point-max))))
1140       (setq chars (- e b))
1141       (unless (zerop chars)
1142         (goto-char b)
1143         (if (search-forward "\n\n" e t) (setq e (1- (point)))))
1144       (with-temp-buffer
1145         (insert-buffer-substring buf b e)
1146         (let ((headers (nnheader-parse-naked-head)))
1147           (mail-header-set-chars headers chars)
1148           (mail-header-set-number headers number)
1149           headers)))))
1150
1151 (defun nnfolder-add-nov (group article headers)
1152   "Add a nov line for the GROUP base."
1153   (with-current-buffer (nnfolder-open-nov group)
1154     (goto-char (point-max))
1155     (mail-header-set-number headers article)
1156     (nnheader-insert-nov headers)))
1157
1158 (provide 'nnfolder)
1159
1160 ;;; nnfolder.el ends here