lisp/gnus/nnfolder.el

   1 ;;; nnfolder.el --- mail folder access for Gnus
   2
   3 ;; Copyright (C) 1995-2014 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 (require 'nnheader)
  32 (require 'message)
  33 (require 'nnmail)
  34 (require 'nnoo)
  35 (eval-when-compile (require 'cl))
  36 (require 'gnus)
  37 (require 'gnus-util)
  38 (require 'gnus-range)
  39
  40 ;; FIXME not explicitly used in this file.
  41 (autoload 'gnus-article-unpropagatable-p "gnus-sum")
  42
  43 (nnoo-declare nnfolder)
  44
  45 (defvoo nnfolder-directory (expand-file-name message-directory)
  46   "The name of the nnfolder directory.")
  47
  48 (defvoo nnfolder-nov-directory nil
  49   "The name of the nnfolder NOV directory.
  50 If nil, `nnfolder-directory' is used.")
  51
  52 (defvoo nnfolder-active-file
  53     (nnheader-concat nnfolder-directory "active")
  54   "The name of the active file.")
  55
  56 ;; I renamed this variable to something more in keeping with the general GNU
  57 ;; style. -SLB
  58
  59 (defvoo nnfolder-ignore-active-file nil
  60   "If non-nil, the active file is ignored.
  61 This causes nnfolder to do some extra work in order to determine the
  62 true active ranges of an mbox file.  Note that the active file is
  63 still saved, but its values are not used.  This costs some extra time
  64 when scanning an mbox when opening it.")
  65
  66 (defvoo nnfolder-distrust-mbox nil
  67   "If non-nil, the folder will be distrusted.
  68 This means that nnfolder will not trust the user with respect to
  69 inserting unaccounted for mail in the middle of an mbox file.  This
  70 can greatly slow down scans, which now must scan the entire file for
  71 unmarked messages.  When nil, scans occur forward from the last marked
  72 message, a huge time saver for large mailboxes.")
  73
  74 (defvoo nnfolder-newsgroups-file
  75     (concat (file-name-as-directory nnfolder-directory) "newsgroups")
  76   "Mail newsgroups description file.")
  77
  78 (defvoo nnfolder-get-new-mail t
  79   "If non-nil, nnfolder will check the incoming mail file and split the mail.")
  80
  81 (defvoo nnfolder-prepare-save-mail-hook nil
  82   "Hook run narrowed to an article before saving.")
  83
  84 (defvoo nnfolder-save-buffer-hook nil
  85   "Hook run before saving the nnfolder mbox buffer.")
  86
  87
  88 (defvoo nnfolder-inhibit-expiry nil
  89   "If non-nil, inhibit expiry.")
  90
  91 \f
  92
  93 (defconst nnfolder-version "nnfolder 2.0"
  94   "nnfolder version.")
  95
  96 (defconst nnfolder-article-marker "X-Gnus-Article-Number: "
  97   "String used to demarcate what the article number for a message is.")
  98
  99 (defvoo nnfolder-current-group nil)
 100 (defvoo nnfolder-current-buffer nil)
 101 (defvoo nnfolder-status-string "")
 102 (defvoo nnfolder-group-alist nil)
 103 (defvoo nnfolder-buffer-alist nil)
 104 (defvoo nnfolder-scantime-alist nil)
 105 (defvoo nnfolder-active-timestamp nil)
 106 (defvoo nnfolder-active-file-coding-system mm-text-coding-system)
 107 (defvoo nnfolder-active-file-coding-system-for-write
 108     nnmail-active-file-coding-system)
 109 (defvoo nnfolder-file-coding-system mm-text-coding-system)
 110 (defvoo nnfolder-file-coding-system-for-write nnheader-file-coding-system
 111   "Coding system for save nnfolder file.
 112 if nil, `nnfolder-file-coding-system' is used.") ; FIXME: fill-in the doc-string of this variable
 113
 114 (defvoo nnfolder-nov-is-evil nil
 115   "If non-nil, Gnus will never generate and use nov databases for mail groups.
 116 Using nov databases will speed up header fetching considerably.
 117 This variable shouldn't be flipped much.  If you have, for some reason,
 118 set this to t, and want to set it to nil again, you should always run
 119 the `nnfolder-generate-active-file' command.  The function will go
 120 through all nnfolder directories and generate nov databases for them
 121 all.  This may very well take some time.")
 122
 123 (defvoo nnfolder-nov-file-suffix ".nov")
 124
 125 (defvoo nnfolder-nov-buffer-alist nil)
 126
 127 (defvar nnfolder-nov-buffer-file-name nil)
 128
 129 \f
 130
 131 ;;; Interface functions
 132
 133 (nnoo-define-basics nnfolder)
 134
 135 (deffoo nnfolder-retrieve-headers (articles &optional group server fetch-old)
 136   (with-current-buffer nntp-server-buffer
 137     (erase-buffer)
 138     (let (article start stop num)
 139       (nnfolder-possibly-change-group group server)
 140       (when nnfolder-current-buffer
 141         (set-buffer nnfolder-current-buffer)
 142         (goto-char (point-min))
 143         (if (stringp (car articles))
 144             'headers
 145           (if (nnfolder-retrieve-headers-with-nov articles fetch-old)
 146               'nov
 147             (setq articles (gnus-sorted-intersection
 148                             ;; Is ARTICLES sorted?
 149                             (sort articles '<)
 150                             (nnfolder-existing-articles)))
 151             (while (setq article (pop articles))
 152               (set-buffer nnfolder-current-buffer)
 153               (cond ((nnfolder-goto-article article)
 154                      (setq start (point))
 155                      (setq stop (if (search-forward "\n\n" nil t)
 156                                     (1- (point))
 157                                   (point-max)))
 158                      (set-buffer nntp-server-buffer)
 159                      (insert (format "221 %d Article retrieved.\n" article))
 160                      (insert-buffer-substring nnfolder-current-buffer
 161                                               start stop)
 162                      (goto-char (point-max))
 163                      (insert ".\n"))
 164
 165                     ;; If we couldn't find this article, skip over ranges
 166                     ;; of missing articles so we don't search the whole file
 167                     ;; for each of them.
 168                     ((numberp article)
 169                      (setq start (point))
 170                      (and
 171                       ;; Check that we are either at BOF or after an
 172                       ;; article with a lower number.  We do this so we
 173                       ;; won't be confused by out-of-order article numbers,
 174                       ;; as caused by active file bogosity.
 175                       (cond
 176                        ((bobp))
 177                        ((search-backward (concat "\n" nnfolder-article-marker)
 178                                          nil t)
 179                         (goto-char (match-end 0))
 180                         (setq num (string-to-number
 181                                    (buffer-substring
 182                                     (point) (point-at-eol))))
 183                         (goto-char start)
 184                         (< num article)))
 185                       ;; Check that we are before an article with a
 186                       ;; higher number.
 187                       (search-forward (concat "\n" nnfolder-article-marker)
 188                                       nil t)
 189                       (progn
 190                         (setq num (string-to-number
 191                                    (buffer-substring
 192                                     (point) (point-at-eol))))
 193                         (> num article))
 194                       ;; Discard any article numbers before the one we're
 195                       ;; now looking at.
 196                       (while (and articles
 197                                   (< (car articles) num))
 198                         (setq articles (cdr articles))))
 199                      (goto-char start))))
 200             (set-buffer nntp-server-buffer)
 201             (nnheader-fold-continuation-lines)
 202             'headers))))))
 203
 204 (deffoo nnfolder-open-server (server &optional defs)
 205   (nnoo-change-server 'nnfolder server defs)
 206   (nnmail-activate 'nnfolder t)
 207   (gnus-make-directory nnfolder-directory)
 208   (unless (or gnus-nov-is-evil nnfolder-nov-is-evil)
 209     (and nnfolder-nov-directory
 210          (gnus-make-directory nnfolder-nov-directory)))
 211   (cond
 212    ((not (file-exists-p nnfolder-directory))
 213     (nnfolder-close-server)
 214     (nnheader-report 'nnfolder "Couldn't create directory: %s"
 215                      nnfolder-directory))
 216    ((not (file-directory-p (file-truename nnfolder-directory)))
 217     (nnfolder-close-server)
 218     (nnheader-report 'nnfolder "Not a directory: %s" nnfolder-directory))
 219    (t
 220     (nnmail-activate 'nnfolder)
 221     (nnheader-report 'nnfolder "Opened server %s using directory %s"
 222                      server nnfolder-directory)
 223     t)))
 224
 225 (deffoo nnfolder-request-close ()
 226   (let ((alist nnfolder-buffer-alist))
 227     (while alist
 228       (nnfolder-close-group (caar alist) nil t)
 229       (setq alist (cdr alist))))
 230   (nnoo-close-server 'nnfolder)
 231   (setq nnfolder-buffer-alist nil
 232         nnfolder-group-alist nil))
 233
 234 (deffoo nnfolder-request-article (article &optional group server buffer)
 235   (nnfolder-possibly-change-group group server)
 236   (with-current-buffer nnfolder-current-buffer
 237     (goto-char (point-min))
 238     (when (nnfolder-goto-article article)
 239       (let (start stop)
 240         (setq start (point))
 241         (forward-line 1)
 242         (unless (and (nnmail-search-unix-mail-delim)
 243                      (forward-line -1))
 244           (goto-char (point-max)))
 245         (setq stop (point))
 246         (let ((nntp-server-buffer (or buffer nntp-server-buffer)))
 247           (set-buffer nntp-server-buffer)
 248           (erase-buffer)
 249           (insert-buffer-substring nnfolder-current-buffer start stop)
 250           (goto-char (point-min))
 251           (while (looking-at "From ")
 252             (delete-char 5)
 253             (insert "X-From-Line: ")
 254             (forward-line 1))
 255           (if (numberp article)
 256               (cons nnfolder-current-group article)
 257             (goto-char (point-min))
 258             (cons nnfolder-current-group
 259                   (if (search-forward (concat "\n" nnfolder-article-marker)
 260                                       nil t)
 261                       (string-to-number (buffer-substring
 262                                       (point) (point-at-eol)))
 263                     -1))))))))
 264
 265 (deffoo nnfolder-request-group (group &optional server dont-check info)
 266   (nnfolder-possibly-change-group group server t)
 267   (save-excursion
 268     (cond ((not (assoc group nnfolder-group-alist))
 269            (nnheader-report 'nnfolder "No such group: %s" group))
 270           ((file-directory-p (nnfolder-group-pathname group))
 271            (nnheader-report 'nnfolder "%s is a directory"
 272                             (file-name-as-directory
 273                              (let ((nnmail-pathname-coding-system nil))
 274                                (nnfolder-group-pathname group)))))
 275           (dont-check
 276            (nnheader-report 'nnfolder "Selected group %s" group)
 277            t)
 278           (t
 279            (let* ((active (assoc group nnfolder-group-alist))
 280                   (group (car active))
 281                   (range (cadr active)))
 282              (cond
 283               ((null active)
 284                (nnheader-report 'nnfolder "No such group: %s" group))
 285               ((null nnfolder-current-group)
 286                (nnheader-report 'nnfolder "Empty group: %s" group))
 287               (t
 288                (nnheader-report 'nnfolder "Selected group %s" group)
 289                (nnheader-insert "211 %d %d %d %s\n"
 290                                 (1+ (- (cdr range) (car range)))
 291                                 (car range) (cdr range) group))))))))
 292
 293 (deffoo nnfolder-request-scan (&optional group server)
 294   (nnfolder-possibly-change-group nil server)
 295   (when nnfolder-get-new-mail
 296     (nnfolder-possibly-change-group group server)
 297     (nnmail-get-new-mail
 298      'nnfolder 'nnfolder-save-all-buffers
 299      nnfolder-directory group)))
 300
 301 (defun nnfolder-save-all-buffers ()
 302   (let ((bufs nnfolder-buffer-alist))
 303     (save-excursion
 304       (while bufs
 305         (if (not (gnus-buffer-live-p (nth 1 (car bufs))))
 306             (setq nnfolder-buffer-alist
 307                   (delq (car bufs) nnfolder-buffer-alist))
 308           (set-buffer (nth 1 (car bufs)))
 309           (nnfolder-save-buffer)
 310           (kill-buffer (current-buffer)))
 311         (setq bufs (cdr bufs))))))
 312
 313 ;; Don't close the buffer if we're not shutting down the server.  This way,
 314 ;; we can keep the buffer in the group buffer cache, and not have to grovel
 315 ;; over the buffer again unless we add new mail to it or modify it in some
 316 ;; way.
 317
 318 (deffoo nnfolder-close-group (group &optional server force)
 319   ;; Make sure we _had_ the group open.
 320   (when (or (assoc group nnfolder-buffer-alist)
 321             (equal group nnfolder-current-group))
 322     (let ((inf (assoc group nnfolder-buffer-alist)))
 323       (when inf
 324         (when (and nnfolder-current-group
 325                    nnfolder-current-buffer)
 326           (push (list nnfolder-current-group nnfolder-current-buffer)
 327                 nnfolder-buffer-alist))
 328         (setq nnfolder-buffer-alist
 329               (delq inf nnfolder-buffer-alist))
 330         (setq nnfolder-current-buffer (cadr inf)
 331               nnfolder-current-group (car inf))))
 332     (when (and nnfolder-current-buffer
 333                (buffer-name nnfolder-current-buffer))
 334       (with-current-buffer nnfolder-current-buffer
 335         ;; If the buffer was modified, write the file out now.
 336         (nnfolder-save-buffer)
 337         ;; If we're shutting the server down, we need to kill the
 338         ;; buffer and remove it from the open buffer list.  Or, of
 339         ;; course, if we're trying to minimize our space impact.
 340         (kill-buffer (current-buffer))
 341         (setq nnfolder-buffer-alist (delq (assoc group nnfolder-buffer-alist)
 342                                           nnfolder-buffer-alist)))))
 343   (setq nnfolder-current-group nil
 344         nnfolder-current-buffer nil)
 345   t)
 346
 347 (deffoo nnfolder-request-create-group (group &optional server args)
 348   (nnfolder-possibly-change-group nil server)
 349   (nnmail-activate 'nnfolder)
 350   (cond ((zerop (length group))
 351          (nnheader-report 'nnfolder "Invalid (empty) group name"))
 352         ((file-directory-p (nnfolder-group-pathname group))
 353          (nnheader-report 'nnfolder "%s is a directory"
 354                           (file-name-as-directory
 355                            (let ((nnmail-pathname-coding-system nil))
 356                              (nnfolder-group-pathname group)))))
 357         ((assoc group nnfolder-group-alist)
 358          t)
 359         (t
 360          (push (list group (cons 1 0)) nnfolder-group-alist)
 361          (nnfolder-save-active nnfolder-group-alist nnfolder-active-file)
 362          (save-current-buffer
 363            (nnfolder-read-folder group))
 364          t)))
 365
 366 (deffoo nnfolder-request-list (&optional server)
 367   (nnfolder-possibly-change-group nil server)
 368   (save-excursion
 369     (let ((nnmail-file-coding-system nnfolder-active-file-coding-system))
 370       (nnmail-find-file nnfolder-active-file)
 371       (setq nnfolder-group-alist (nnmail-get-active)))
 372     t))
 373
 374 (deffoo nnfolder-request-newgroups (date &optional server)
 375   (nnfolder-possibly-change-group nil server)
 376   (nnfolder-request-list server))
 377
 378 (deffoo nnfolder-request-list-newsgroups (&optional server)
 379   (nnfolder-possibly-change-group nil server)
 380   (save-excursion
 381     (let ((nnmail-file-coding-system nnfolder-file-coding-system))
 382       (nnmail-find-file nnfolder-newsgroups-file))))
 383
 384 ;; Return a list consisting of all article numbers existing in the
 385 ;; current folder.
 386
 387 (defun nnfolder-existing-articles ()
 388   (save-excursion
 389     (when nnfolder-current-buffer
 390       (set-buffer nnfolder-current-buffer)
 391       (goto-char (point-min))
 392       (let ((marker (concat "\n" nnfolder-article-marker))
 393             (number "[0-9]+")
 394             numbers)
 395         (while (and (search-forward marker nil t)
 396                     (re-search-forward number nil t))
 397           (let ((newnum (string-to-number (match-string 0))))
 398             (if (nnmail-within-headers-p)
 399                 (push newnum numbers))))
 400       ;; The article numbers are increasing, so this result is sorted.
 401         (nreverse numbers)))))
 402
 403 (autoload 'gnus-request-group "gnus-int")
 404 (declare-function gnus-request-create-group "gnus-int"
 405                   (group &optional gnus-command-method args))
 406
 407 (deffoo nnfolder-request-expire-articles (articles newsgroup
 408                                                    &optional server force)
 409   (nnfolder-possibly-change-group newsgroup server)
 410   (let ((is-old t)
 411         ;; The articles we have deleted so far.
 412         (deleted-articles nil)
 413         ;; The articles that really exist and will
 414         ;; be expired if they are old enough.
 415         (maybe-expirable
 416          (gnus-sorted-intersection articles (nnfolder-existing-articles)))
 417         target)
 418     (nnmail-activate 'nnfolder)
 419
 420     (with-current-buffer nnfolder-current-buffer
 421       ;; Since messages are sorted in arrival order and expired in the
 422       ;; same order, we can stop as soon as we find a message that is
 423       ;; too old.
 424       (while (and maybe-expirable is-old)
 425         (goto-char (point-min))
 426         (when (and (nnfolder-goto-article (car maybe-expirable))
 427                    (search-forward (concat "\n" nnfolder-article-marker)
 428                                    nil t))
 429           (forward-sexp)
 430           (when (setq is-old
 431                       (nnmail-expired-article-p
 432                        newsgroup
 433                        (buffer-substring
 434                         (point) (progn (end-of-line) (point)))
 435                        force nnfolder-inhibit-expiry))
 436             (setq target nnmail-expiry-target)
 437             (unless (eq target 'delete)
 438               (with-temp-buffer
 439                 (nnfolder-request-article (car maybe-expirable)
 440                                           newsgroup server (current-buffer))
 441                 (let ((nnfolder-current-directory nil))
 442                   (when (functionp target)
 443                     (setq target (funcall target newsgroup)))
 444                   (when (and target (not (eq target 'delete)))
 445                     (if (or (gnus-request-group target)
 446                             (gnus-request-create-group target))
 447                         (nnmail-expiry-target-group target newsgroup)
 448                       (setq target nil)))))
 449               (nnfolder-possibly-change-group newsgroup server))
 450             (when target
 451               (nnheader-message 5 "Deleting article %d in %s..."
 452                                 (car maybe-expirable) newsgroup)
 453               (nnfolder-delete-mail)
 454               (unless (or gnus-nov-is-evil nnfolder-nov-is-evil)
 455                 (nnfolder-nov-delete-article newsgroup (car maybe-expirable)))
 456               ;; Must remember which articles were actually deleted
 457               (push (car maybe-expirable) deleted-articles))))
 458         (setq maybe-expirable (cdr maybe-expirable)))
 459       (unless nnfolder-inhibit-expiry
 460         (nnheader-message 5 "Deleting articles...done"))
 461       (nnfolder-save-buffer)
 462       (nnfolder-adjust-min-active newsgroup)
 463       (nnfolder-save-active nnfolder-group-alist nnfolder-active-file)
 464       (nnfolder-save-all-buffers)
 465       (gnus-sorted-difference articles (nreverse deleted-articles)))))
 466
 467 (deffoo nnfolder-request-move-article (article group server accept-form
 468                                                &optional last move-is-internal)
 469   (save-excursion
 470     (let ((buf (get-buffer-create " *nnfolder move*"))
 471           result)
 472       (and
 473        (nnfolder-request-article article group server)
 474        (with-current-buffer buf
 475          (erase-buffer)
 476          (insert-buffer-substring nntp-server-buffer)
 477          (goto-char (point-min))
 478          (while (re-search-forward
 479                  (concat "^" nnfolder-article-marker)
 480                  (save-excursion (and (search-forward "\n\n" nil t) (point)))
 481                  t)
 482            (gnus-delete-line))
 483          (setq result (eval accept-form))
 484          (kill-buffer buf)
 485          result)
 486        (save-excursion
 487          (nnfolder-possibly-change-group group server)
 488          (set-buffer nnfolder-current-buffer)
 489          (goto-char (point-min))
 490          (when (nnfolder-goto-article article)
 491            (nnfolder-delete-mail))
 492          (unless (or gnus-nov-is-evil nnfolder-nov-is-evil)
 493            (nnfolder-nov-delete-article group article))
 494          (when last
 495            (nnfolder-save-buffer)
 496            (nnfolder-adjust-min-active group)
 497            (nnfolder-save-active nnfolder-group-alist nnfolder-active-file))))
 498       result)))
 499
 500 (deffoo nnfolder-request-accept-article (group &optional server last)
 501   (save-excursion
 502     (nnfolder-possibly-change-group group server)
 503     (nnmail-check-syntax)
 504     (let ((buf (current-buffer))
 505           result art-group)
 506       (goto-char (point-min))
 507       (when (looking-at "X-From-Line: ")
 508         (replace-match "From ")
 509         (while (progn (forward-line) (looking-at "[ \t]"))
 510           (delete-char -1)))
 511       (with-temp-buffer
 512         (let ((nnmail-file-coding-system nnfolder-active-file-coding-system)
 513               (nntp-server-buffer (current-buffer)))
 514           (nnmail-find-file nnfolder-active-file)
 515           (setq nnfolder-group-alist (nnmail-parse-active))))
 516       (save-excursion
 517         (goto-char (point-min))
 518         (if (search-forward "\n\n" nil t)
 519             (forward-line -1)
 520           (goto-char (point-max)))
 521         (while (re-search-backward (concat "^" nnfolder-article-marker) nil t)
 522           (delete-region (point) (progn (forward-line 1) (point))))
 523         (when nnmail-cache-accepted-message-ids
 524           (nnmail-cache-insert (nnmail-fetch-field "message-id")
 525                                group
 526                                (nnmail-fetch-field "subject")
 527                                (nnmail-fetch-field "from")))
 528         (setq result (if (stringp group)
 529                          (list (cons group (nnfolder-active-number group)))
 530                        (setq art-group
 531                              (nnmail-article-group 'nnfolder-active-number))))
 532         (if (and (null result)
 533                  (yes-or-no-p "Moved to `junk' group; delete article? "))
 534             (setq result 'junk)
 535           (setq result
 536                 (car (nnfolder-save-mail result)))))
 537       (when last
 538         (save-excursion
 539           (nnfolder-possibly-change-folder (or (caar art-group) group))
 540           (nnfolder-save-buffer)
 541           (when nnmail-cache-accepted-message-ids
 542             (nnmail-cache-close))))
 543       (nnfolder-save-active nnfolder-group-alist nnfolder-active-file)
 544       (unless result
 545         (nnheader-report 'nnfolder "Couldn't store article"))
 546       result)))
 547
 548 (deffoo nnfolder-request-replace-article (article group buffer)
 549   (nnfolder-possibly-change-group group)
 550   (with-current-buffer buffer
 551     (goto-char (point-min))
 552     (if (not (looking-at "X-From-Line: "))
 553         (insert "From nobody " (current-time-string) "\n")
 554       (replace-match "From ")
 555       (forward-line 1)
 556       (while (looking-at "[ \t]")
 557         (delete-char -1)
 558         (forward-line 1)))
 559     (nnfolder-normalize-buffer)
 560     (set-buffer nnfolder-current-buffer)
 561     (goto-char (point-min))
 562     (if (not (nnfolder-goto-article article))
 563         nil
 564       (nnfolder-delete-mail)
 565       (insert-buffer-substring buffer)
 566       (unless (or gnus-nov-is-evil nnfolder-nov-is-evil)
 567         (with-current-buffer buffer
 568           (let ((headers (nnfolder-parse-head article
 569                                               (point-min) (point-max))))
 570             (with-current-buffer (nnfolder-open-nov group)
 571               (if (nnheader-find-nov-line article)
 572                   (delete-region (point) (progn (forward-line 1) (point))))
 573               (nnheader-insert-nov headers)))))
 574       (nnfolder-save-buffer)
 575       t)))
 576
 577 (deffoo nnfolder-request-delete-group (group &optional force server)
 578   (nnfolder-close-group group server t)
 579   ;; Delete all articles in GROUP.
 580   (if (not force)
 581       ()                                ; Don't delete the articles.
 582     ;; Delete the file that holds the group.
 583     (let ((data (nnfolder-group-pathname group))
 584           (nov (nnfolder-group-nov-pathname group)))
 585       (ignore-errors (delete-file data))
 586       (ignore-errors (delete-file nov))))
 587   ;; Remove the group from all structures.
 588   (setq nnfolder-group-alist
 589         (delq (assoc group nnfolder-group-alist) nnfolder-group-alist)
 590         nnfolder-current-group nil
 591         nnfolder-current-buffer nil)
 592   ;; Save the active file.
 593   (nnfolder-save-active nnfolder-group-alist nnfolder-active-file)
 594   t)
 595
 596 (deffoo nnfolder-request-rename-group (group new-name &optional server)
 597   (nnfolder-possibly-change-group group server)
 598   (with-current-buffer nnfolder-current-buffer
 599     (and (file-writable-p buffer-file-name)
 600          (ignore-errors
 601            (let ((new-file (nnfolder-group-pathname new-name)))
 602              (gnus-make-directory (file-name-directory new-file))
 603              (rename-file buffer-file-name new-file)
 604              (when (file-exists-p (nnfolder-group-nov-pathname group))
 605                (setq new-file (nnfolder-group-nov-pathname new-name))
 606                (gnus-make-directory (file-name-directory new-file))
 607                (rename-file (nnfolder-group-nov-pathname group) new-file)))
 608            t)
 609          ;; That went ok, so we change the internal structures.
 610          (let ((entry (assoc group nnfolder-group-alist)))
 611            (and entry (setcar entry new-name))
 612            (setq nnfolder-current-buffer nil
 613                  nnfolder-current-group nil)
 614            ;; Save the new group alist.
 615            (nnfolder-save-active nnfolder-group-alist nnfolder-active-file)
 616            ;; We kill the buffer instead of renaming it and stuff.
 617            (kill-buffer (current-buffer))
 618            t))))
 619
 620 (deffoo nnfolder-request-regenerate (server)
 621   (nnfolder-possibly-change-group nil server)
 622   (nnfolder-generate-active-file)
 623   t)
 624
 625 \f
 626 ;;; Internal functions.
 627
 628 (defun nnfolder-adjust-min-active (group)
 629   ;; Find the lowest active article in this group.
 630   (let* ((active (cadr (assoc group nnfolder-group-alist)))
 631          (marker (concat "\n" nnfolder-article-marker))
 632          (number "[0-9]+")
 633          (activemin (cdr active)))
 634     (with-current-buffer nnfolder-current-buffer
 635       (goto-char (point-min))
 636       (while (and (search-forward marker nil t)
 637                   (re-search-forward number nil t))
 638         (let ((newnum (string-to-number (match-string 0))))
 639           (if (nnmail-within-headers-p)
 640               (setq activemin (min activemin newnum)))))
 641       (setcar active activemin))))
 642
 643 (defun nnfolder-article-string (article)
 644   (if (numberp article)
 645       (concat "\n" nnfolder-article-marker (int-to-string article) " ")
 646     (concat "\nMessage-ID: " article)))
 647
 648 (defun nnfolder-goto-article (article)
 649   "Place point at the start of the headers of ARTICLE.
 650 ARTICLE can be an article number or a Message-ID.
 651 Returns t if successful, nil otherwise."
 652   (let ((art-string (nnfolder-article-string article))
 653         start found)
 654     ;; It is likely that we are at or before the delimiter line.
 655     ;; We therefore go to the end of the previous line, and start
 656     ;; searching from there.
 657     (beginning-of-line)
 658     (unless (bobp)
 659       (forward-char -1))
 660     (setq start (point))
 661     ;; First search forward.
 662     (while (and (setq found (search-forward art-string nil t))
 663                 (not (nnmail-within-headers-p))))
 664     ;; If unsuccessful, search backward from where we started,
 665     (unless found
 666       (goto-char start)
 667       (while (and (setq found (search-backward art-string nil t))
 668                   (not (nnmail-within-headers-p)))))
 669     (when found
 670       (nnmail-search-unix-mail-delim-backward))))
 671
 672 (defun nnfolder-delete-mail (&optional leave-delim)
 673   "Delete the message that point is in.
 674 If optional argument LEAVE-DELIM is t, then mailbox delimiter is not
 675 deleted.  Point is left where the deleted region was."
 676   (save-restriction
 677     (narrow-to-region
 678      (save-excursion
 679        ;; In case point is at the beginning of the message already.
 680        (forward-line 1)
 681        (nnmail-search-unix-mail-delim-backward)
 682        (if leave-delim (progn (forward-line 1) (point))
 683          (point)))
 684      (progn
 685        (forward-line 1)
 686        (if (nnmail-search-unix-mail-delim)
 687            (point)
 688          (point-max))))
 689     (run-hooks 'nnfolder-delete-mail-hook)
 690     (delete-region (point-min) (point-max))))
 691
 692 (defun nnfolder-possibly-change-group (group &optional server dont-check)
 693   ;; Change servers.
 694   (when (and server
 695              (not (nnfolder-server-opened server)))
 696     (nnfolder-open-server server))
 697   (unless (gnus-buffer-live-p nnfolder-current-buffer)
 698     (setq nnfolder-current-buffer nil
 699           nnfolder-current-group nil))
 700   ;; Change group.
 701   (let ((file-name-coding-system nnmail-pathname-coding-system))
 702     (when (and group
 703                (not (equal group nnfolder-current-group))
 704                (progn
 705                  (nnmail-activate 'nnfolder)
 706                  (and (assoc group nnfolder-group-alist)
 707                       (file-exists-p (nnfolder-group-pathname group)))))
 708       (if dont-check
 709           (setq nnfolder-current-group group
 710                 nnfolder-current-buffer nil)
 711         (let (inf file)
 712           ;; If we have to change groups, see if we don't already have
 713           ;; the folder in memory.  If we do, verify the modtime and
 714           ;; destroy the folder if needed so we can rescan it.
 715           (setq nnfolder-current-buffer
 716                 (nth 1 (assoc group nnfolder-buffer-alist)))
 717
 718           ;; If the buffer is not live, make sure it isn't in the
 719           ;; alist.  If it is live, verify that nobody else has
 720           ;; touched the file since last time.
 721           (when (and nnfolder-current-buffer
 722                      (not (gnus-buffer-live-p nnfolder-current-buffer)))
 723             (setq nnfolder-buffer-alist (delq inf nnfolder-buffer-alist)
 724                   nnfolder-current-buffer nil))
 725
 726           (setq nnfolder-current-group group)
 727
 728           (when (or (not nnfolder-current-buffer)
 729                     (not (verify-visited-file-modtime
 730                           nnfolder-current-buffer)))
 731             (save-excursion
 732               (setq file (nnfolder-group-pathname group))
 733               ;; See whether we need to create the new file.
 734               (unless (file-exists-p file)
 735                 (gnus-make-directory (file-name-directory file))
 736                 (let ((nnmail-file-coding-system
 737                        (or nnfolder-file-coding-system-for-write
 738                            nnfolder-file-coding-system-for-write)))
 739                   (nnmail-write-region (point-min) (point-min)
 740                                        file t 'nomesg)))
 741               (when (setq nnfolder-current-buffer (nnfolder-read-folder group))
 742                 (set-buffer nnfolder-current-buffer)
 743                 (push (list group nnfolder-current-buffer)
 744                       nnfolder-buffer-alist)))))))))
 745
 746 (defun nnfolder-save-mail (group-art-list)
 747   "Called narrowed to an article."
 748   (let* (save-list group-art)
 749     (goto-char (point-min))
 750     ;; The From line may have been quoted by movemail.
 751     (when (looking-at ">From")
 752       (delete-char 1))
 753     ;; This might come from somewhere else.
 754     (unless (looking-at "From ")
 755       (insert "From nobody " (current-time-string) "\n")
 756       (goto-char (point-min)))
 757     ;; Quote all "From " lines in the article.
 758     (forward-line 1)
 759     (let (case-fold-search)
 760       (while (re-search-forward "^From " nil t)
 761         (beginning-of-line)
 762         (insert "> ")))
 763     (setq save-list group-art-list)
 764     (nnmail-insert-lines)
 765     (nnmail-insert-xref group-art-list)
 766     (run-hooks 'nnmail-prepare-save-mail-hook)
 767     (run-hooks 'nnfolder-prepare-save-mail-hook)
 768
 769     ;; Insert the mail into each of the destination groups.
 770     (while (setq group-art (pop group-art-list))
 771       ;; Kill any previous newsgroup markers.
 772       (goto-char (point-min))
 773       (if (search-forward "\n\n" nil t)
 774           (forward-line -1)
 775         (goto-char (point-max)))
 776       (while (search-backward (concat "\n" nnfolder-article-marker) nil t)
 777         (delete-region (1+ (point)) (progn (forward-line 2) (point))))
 778
 779       ;; Insert the new newsgroup marker.
 780       (nnfolder-insert-newsgroup-line group-art)
 781
 782       (save-excursion
 783         (let ((beg (point-min))
 784               (end (point-max))
 785               (obuf (current-buffer)))
 786           (nnfolder-possibly-change-folder (car group-art))
 787           (let ((buffer-read-only nil))
 788             (nnfolder-normalize-buffer)
 789             (insert-buffer-substring obuf beg end))
 790           (unless (or gnus-nov-is-evil nnfolder-nov-is-evil)
 791             (set-buffer obuf)
 792             (nnfolder-add-nov (car group-art) (cdr group-art)
 793                               (nnfolder-parse-head nil beg end))))))
 794
 795     ;; Did we save it anywhere?
 796     save-list))
 797
 798 (defun nnfolder-normalize-buffer ()
 799   "Make sure there are two newlines at the end of the buffer."
 800   (goto-char (point-max))
 801   (skip-chars-backward "\n")
 802   (delete-region (point) (point-max))
 803   (unless (bobp)
 804     (insert "\n\n")))
 805
 806 (defun nnfolder-insert-newsgroup-line (group-art)
 807   (save-excursion
 808     (goto-char (point-min))
 809     (unless (search-forward "\n\n" nil t)
 810       (goto-char (point-max))
 811       (insert "\n"))
 812     (forward-char -1)
 813     (insert (format (concat nnfolder-article-marker "%d   %s\n")
 814                     (cdr group-art) (message-make-date)))))
 815
 816 (defun nnfolder-active-number (group)
 817   ;; Find the next article number in GROUP.
 818   (let ((active (cadr (assoc group nnfolder-group-alist))))
 819     (if active
 820         (setcdr active (1+ (cdr active)))
 821       ;; This group is new, so we create a new entry for it.
 822       ;; This might be a bit naughty... creating groups on the drop of
 823       ;; a hat, but I don't know...
 824       (push (list group (setq active (cons 1 1)))
 825             nnfolder-group-alist))
 826     (cdr active)))
 827
 828 (defun nnfolder-possibly-change-folder (group)
 829   (let ((inf (assoc group nnfolder-buffer-alist)))
 830     (if (and inf
 831              (gnus-buffer-live-p (cadr inf)))
 832         (set-buffer (cadr inf))
 833       (when inf
 834         (setq nnfolder-buffer-alist (delq inf nnfolder-buffer-alist)))
 835       (when nnfolder-group-alist
 836         (nnfolder-save-active nnfolder-group-alist nnfolder-active-file))
 837       (push (list group (nnfolder-read-folder group))
 838             nnfolder-buffer-alist))))
 839
 840 ;; This method has a problem if you've accidentally let the active
 841 ;; list get out of sync with the files.  This could happen, say, if
 842 ;; you've accidentally gotten new mail with something other than Gnus
 843 ;; (but why would _that_ ever happen? :-).  In that case, we will be
 844 ;; in the middle of processing the file, ready to add new X-Gnus
 845 ;; article number markers, and we'll run across a message with no ID
 846 ;; yet - the active list _may_not_ be ready for us yet.
 847
 848 ;; To handle this, I'm modifying this routine to maintain the maximum
 849 ;; ID seen so far, and when we hit a message with no ID, we will
 850 ;; _manually_ scan the rest of the message looking for any more,
 851 ;; possibly higher IDs.  We'll assume the maximum that we find is the
 852 ;; highest active.  Note that this shouldn't cost us much extra time
 853 ;; at all, but will be a lot less vulnerable to glitches between the
 854 ;; mbox and the active file.
 855
 856 (defun nnfolder-read-folder (group)
 857   (let* ((file (nnfolder-group-pathname group))
 858          (nov  (nnfolder-group-nov-pathname group))
 859          (buffer (set-buffer
 860                   (let ((nnheader-file-coding-system
 861                          nnfolder-file-coding-system))
 862                     (nnheader-find-file-noselect file t)))))
 863     (mm-enable-multibyte) ;; Use multibyte buffer for future copying.
 864     (buffer-disable-undo)
 865     (if (equal (cadr (assoc group nnfolder-scantime-alist))
 866                (nth 5 (file-attributes file)))
 867         ;; This looks up-to-date, so we don't do any scanning.
 868         (if (file-exists-p file)
 869             buffer
 870           (push (list group buffer) nnfolder-buffer-alist)
 871           (set-buffer-modified-p t)
 872           (nnfolder-save-buffer))
 873       ;; Parse the damn thing.
 874       (save-excursion
 875         (goto-char (point-min))
 876         ;; Remove any blank lines at the start.
 877         (while (eq (following-char) ?\n)
 878           (delete-char 1))
 879         (nnmail-activate 'nnfolder)
 880         ;; Read in the file.
 881         (let ((delim "^From ")
 882               (marker (concat "\n" nnfolder-article-marker))
 883               (number "[0-9]+")
 884               (active (or (cadr (assoc group nnfolder-group-alist))
 885                           (cons 1 0)))
 886               (scantime (assoc group nnfolder-scantime-alist))
 887               (minid (or (and (boundp 'most-positive-fixnum)
 888                               most-positive-fixnum)
 889                          (lsh -1 -1)))
 890               maxid start end newscantime
 891               novbuf articles newnum
 892               buffer-read-only)
 893           (setq maxid (cdr active))
 894
 895           (unless (or gnus-nov-is-evil nnfolder-nov-is-evil
 896                       (and (file-exists-p nov)
 897                            (file-newer-than-file-p nov file)))
 898             (unless (file-exists-p nov)
 899               (gnus-make-directory (file-name-directory nov)))
 900             (with-current-buffer
 901                 (setq novbuf (nnfolder-open-nov group))
 902               (goto-char (point-min))
 903               (while (not (eobp))
 904                 (push (read novbuf) articles)
 905                 (forward-line 1))
 906               (setq articles (nreverse articles))))
 907           (goto-char (point-min))
 908
 909           ;; Anytime the active number is 1 or 0, it is suspect.  In
 910           ;; that case, search the file manually to find the active
 911           ;; number.  Or, of course, if we're being paranoid.  (This
 912           ;; would also be the place to build other lists from the
 913           ;; header markers, such as expunge lists, etc., if we ever
 914           ;; desired to abandon the active file entirely for mboxes.)
 915           (when (or nnfolder-ignore-active-file
 916                     novbuf
 917                     (< maxid 2))
 918             (while (and (search-forward marker nil t)
 919                         (looking-at number))
 920               (setq newnum (string-to-number (match-string 0)))
 921               (when (nnmail-within-headers-p)
 922                 (setq maxid (max maxid newnum)
 923                       minid (min minid newnum))
 924                 (when novbuf
 925                   (if (memq newnum articles)
 926                       (setq articles (delq newnum articles))
 927                     (let ((headers (nnfolder-parse-head newnum)))
 928                       (with-current-buffer novbuf
 929                         (nnheader-find-nov-line newnum)
 930                         (nnheader-insert-nov headers)))))))
 931             (when (and novbuf articles)
 932               (with-current-buffer novbuf
 933                 (dolist (article articles)
 934                   (when (nnheader-find-nov-line article)
 935                     (delete-region (point)
 936                                    (progn (forward-line 1) (point)))))))
 937             (setcar active (max 1 (min minid maxid)))
 938             (setcdr active (max maxid (cdr active)))
 939             (goto-char (point-min)))
 940
 941           ;; As long as we trust that the user will only insert
 942           ;; unmarked mail at the end, go to the end and search
 943           ;; backwards for the last marker.  Find the start of that
 944           ;; message, and begin to search for unmarked messages from
 945           ;; there.
 946           (when (not (or nnfolder-distrust-mbox
 947                          (< maxid 2)))
 948             (goto-char (point-max))
 949             (unless (re-search-backward marker nil t)
 950               (goto-char (point-min)))
 951             ;;(when (nnmail-search-unix-mail-delim)
 952             ;;  (goto-char (point-min)))
 953             )
 954
 955           ;; Keep track of the active number on our own, and insert it
 956           ;; back into the active list when we're done.  Also, prime
 957           ;; the pump to cut down on the number of searches we do.
 958           (unless (nnmail-search-unix-mail-delim)
 959             (goto-char (point-max)))
 960           (setq end (point-marker))
 961           (while (not (= end (point-max)))
 962             (setq start (marker-position end))
 963             (goto-char end)
 964            ;; There may be more than one "From " line, so we skip past
 965             ;; them.
 966             (while (looking-at delim)
 967               (forward-line 1))
 968             (set-marker end (if (nnmail-search-unix-mail-delim)
 969                                 (point)
 970                               (point-max)))
 971             (goto-char start)
 972             (when (not (search-forward marker end t))
 973               (narrow-to-region start end)
 974               (nnmail-insert-lines)
 975               (nnfolder-insert-newsgroup-line
 976                (cons nil
 977                      (setq newnum
 978                            (nnfolder-active-number group))))
 979               (when novbuf
 980                 (let ((headers (nnfolder-parse-head newnum (point-min)
 981                                                     (point-max))))
 982                   (with-current-buffer novbuf
 983                     (goto-char (point-max))
 984                     (nnheader-insert-nov headers))))
 985               (widen)))
 986
 987           (set-marker end nil)
 988           ;; Make absolutely sure that the active list reflects
 989           ;; reality!
 990           (nnfolder-save-active nnfolder-group-alist nnfolder-active-file)
 991
 992           ;; Set the scantime for this group.
 993           (setq newscantime (visited-file-modtime))
 994           (if scantime
 995               (setcdr scantime (list newscantime))
 996             (push (list group newscantime)
 997                   nnfolder-scantime-alist))
 998           ;; Save nov.
 999           (when novbuf
1000             (nnfolder-save-nov))
1001           (current-buffer))))))
1002
1003 (defun nnfolder-recursive-directory-files (dir prefix)
1004   (let ((files nil))
1005     (dolist (file (directory-files dir))
1006       (cond
1007        ((or (file-symlink-p (expand-file-name file dir))
1008             (member file '("." "..")))
1009         ;; Ignore
1010         )
1011        ((file-directory-p (expand-file-name file dir))
1012         (setq files (nconc (nnfolder-recursive-directory-files
1013                             (expand-file-name file dir)
1014                             (if prefix
1015                                 (concat prefix "." (directory-file-name file))
1016                               (file-name-nondirectory file)))
1017                            files)))
1018        ((file-regular-p (expand-file-name file dir))
1019         (push (if prefix
1020                   (concat prefix "." file)
1021                 file)
1022               files))))
1023     files))
1024
1025 ;;;###autoload
1026 (defun nnfolder-generate-active-file ()
1027   "Look for mbox folders in the nnfolder directory and make them into groups.
1028 This command does not work if you use short group names."
1029   (interactive)
1030   (nnmail-activate 'nnfolder)
1031   (unless (or gnus-nov-is-evil nnfolder-nov-is-evil)
1032     (dolist (file (directory-files (or nnfolder-nov-directory
1033                                        nnfolder-directory)
1034                                    t
1035                                    (concat
1036                                     (regexp-quote nnfolder-nov-file-suffix)
1037                                     "$")))
1038       (when (not (message-mail-file-mbox-p file))
1039         (ignore-errors
1040           (delete-file file)))))
1041     (dolist (file (if nnmail-use-long-file-names
1042                       (directory-files nnfolder-directory)
1043                     (nnfolder-recursive-directory-files
1044                      nnfolder-directory nil)))
1045       (when (and (not (backup-file-name-p file))
1046                  (message-mail-file-mbox-p
1047                   (nnfolder-group-pathname file)))
1048         (let ((oldgroup (assoc file nnfolder-group-alist)))
1049           (if oldgroup
1050               (nnheader-message 5 "Refreshing group %s..." file)
1051             (nnheader-message 5 "Adding group %s..." file))
1052           (if oldgroup
1053               (setq nnfolder-group-alist
1054                     (delq oldgroup (copy-sequence nnfolder-group-alist))))
1055           (push (list file (cons 1 0)) nnfolder-group-alist)
1056           (nnfolder-possibly-change-folder file)
1057           (nnfolder-possibly-change-group file)
1058           (nnfolder-close-group file))))
1059     (nnheader-message 5 ""))
1060
1061 (defun nnfolder-group-pathname (group)
1062   "Make file name for GROUP."
1063   (setq group
1064         (mm-encode-coding-string group nnmail-pathname-coding-system))
1065   (let ((dir (file-name-as-directory (expand-file-name nnfolder-directory))))
1066     ;; If this file exists, we use it directly.
1067     (if (or nnmail-use-long-file-names
1068             (file-exists-p (concat dir group)))
1069         (concat dir group)
1070       ;; If not, we translate dots into slashes.
1071       (concat dir (nnheader-replace-chars-in-string group ?. ?/)))))
1072
1073 (defun nnfolder-group-nov-pathname (group)
1074   "Make pathname for GROUP NOV."
1075   (let ((nnfolder-directory
1076          (or nnfolder-nov-directory nnfolder-directory)))
1077     (concat (nnfolder-group-pathname group) nnfolder-nov-file-suffix)))
1078
1079 (defvar copyright-update)
1080
1081 (defun nnfolder-save-buffer ()
1082   "Save the buffer."
1083   (let ((delete-old-versions t))
1084     (when (buffer-modified-p)
1085       (run-hooks 'nnfolder-save-buffer-hook)
1086       (gnus-make-directory (file-name-directory (buffer-file-name)))
1087       (let ((coding-system-for-write
1088              (or nnfolder-file-coding-system-for-write
1089                  nnfolder-file-coding-system)))
1090         (set (make-local-variable 'copyright-update) nil)
1091         (save-buffer)))
1092     (unless (or gnus-nov-is-evil nnfolder-nov-is-evil)
1093       (nnfolder-save-nov))))
1094
1095 (defun nnfolder-save-active (group-alist active-file)
1096   (let ((nnmail-active-file-coding-system
1097          (or nnfolder-active-file-coding-system-for-write
1098              nnfolder-active-file-coding-system)))
1099     (nnmail-save-active group-alist active-file)))
1100
1101 (defun nnfolder-open-nov (group)
1102   (or (cdr (assoc group nnfolder-nov-buffer-alist))
1103       (let ((buffer (get-buffer-create (format " *nnfolder overview %s*" group))))
1104         (with-current-buffer buffer
1105           (set (make-local-variable 'nnfolder-nov-buffer-file-name)
1106                (nnfolder-group-nov-pathname group))
1107           (erase-buffer)
1108           (when (file-exists-p nnfolder-nov-buffer-file-name)
1109             (nnheader-insert-file-contents nnfolder-nov-buffer-file-name)))
1110         (push (cons group buffer) nnfolder-nov-buffer-alist)
1111         buffer)))
1112
1113 (defun nnfolder-save-nov ()
1114   (save-excursion
1115     (while nnfolder-nov-buffer-alist
1116       (when (buffer-name (cdar nnfolder-nov-buffer-alist))
1117         (set-buffer (cdar nnfolder-nov-buffer-alist))
1118         (when (buffer-modified-p)
1119           (gnus-make-directory (file-name-directory
1120                                 nnfolder-nov-buffer-file-name))
1121           (nnmail-write-region 1 (point-max) nnfolder-nov-buffer-file-name
1122                                nil 'nomesg))
1123         (set-buffer-modified-p nil)
1124         (kill-buffer (current-buffer)))
1125       (setq nnfolder-nov-buffer-alist (cdr nnfolder-nov-buffer-alist)))))
1126
1127 (defun nnfolder-nov-delete-article (group article)
1128   (with-current-buffer (nnfolder-open-nov group)
1129     (when (nnheader-find-nov-line article)
1130       (delete-region (point) (progn (forward-line 1) (point))))
1131     t))
1132
1133 (defun nnfolder-retrieve-headers-with-nov (articles &optional fetch-old)
1134   (if (or gnus-nov-is-evil nnfolder-nov-is-evil)
1135       nil
1136     (let ((nov (nnfolder-group-nov-pathname nnfolder-current-group)))
1137       (when (file-exists-p nov)
1138         (with-current-buffer nntp-server-buffer
1139           (erase-buffer)
1140           (nnheader-insert-file-contents nov)
1141           (if (and fetch-old
1142                    (not (numberp fetch-old)))
1143               t                         ; Don't remove anything.
1144             (nnheader-nov-delete-outside-range
1145              (if fetch-old (max 1 (- (car articles) fetch-old))
1146                (car articles))
1147              (car (last articles)))
1148             t))))))
1149
1150 (defun nnfolder-parse-head (&optional number b e)
1151   "Parse the head of the current buffer."
1152   (let ((buf (current-buffer))
1153         chars)
1154     (save-excursion
1155       (unless b
1156         (setq b (if (nnmail-search-unix-mail-delim-backward)
1157                     (point) (point-min)))
1158         (forward-line 1)
1159         (setq e (if (nnmail-search-unix-mail-delim)
1160                     (point) (point-max))))
1161       (setq chars (- e b))
1162       (unless (zerop chars)
1163         (goto-char b)
1164         (if (search-forward "\n\n" e t) (setq e (1- (point)))))
1165       (with-temp-buffer
1166         (insert-buffer-substring buf b e)
1167         (let ((headers (nnheader-parse-naked-head)))
1168           (mail-header-set-chars headers chars)
1169           (mail-header-set-number headers number)
1170           headers)))))
1171
1172 (defun nnfolder-add-nov (group article headers)
1173   "Add a nov line for the GROUP base."
1174   (with-current-buffer (nnfolder-open-nov group)
1175     (goto-char (point-max))
1176     (mail-header-set-number headers article)
1177     (nnheader-insert-nov headers)))
1178
1179 (provide 'nnfolder)
1180
1181 ;;; nnfolder.el ends here