lisp/gnus/nnmh.el

   1 ;;; nnmh.el --- mhspool access for Gnus
   2
   3 ;; Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2003
   4 ;;      Free Software Foundation, Inc.
   5
   6 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   7 ;;      Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
   8 ;; Keywords: news, mail
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software; you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation; either version 2, or (at your option)
  15 ;; any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  24 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  25 ;; Boston, MA 02111-1307, USA.
  26
  27 ;;; Commentary:
  28
  29 ;; Based on nnspool.el by Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>.
  30 ;; For an overview of what the interface functions do, please see the
  31 ;; Gnus sources.
  32
  33 ;;; Code:
  34
  35 (require 'nnheader)
  36 (require 'nnmail)
  37 (require 'gnus-start)
  38 (require 'nnoo)
  39 (eval-when-compile (require 'cl))
  40
  41 (nnoo-declare nnmh)
  42
  43 (defvoo nnmh-directory message-directory
  44   "Mail spool directory.")
  45
  46 (defvoo nnmh-get-new-mail t
  47   "If non-nil, nnmh will check the incoming mail file and split the mail.")
  48
  49 (defvoo nnmh-prepare-save-mail-hook nil
  50   "Hook run narrowed to an article before saving.")
  51
  52 (defvoo nnmh-be-safe nil
  53   "If non-nil, nnmh will check all articles to make sure whether they are new or not.
  54 Go through the .nnmh-articles file and compare with the actual
  55 articles in this folder.  The articles that are \"new\" will be marked
  56 as unread by Gnus.")
  57
  58 \f
  59
  60 (defconst nnmh-version "nnmh 1.0"
  61   "nnmh version.")
  62
  63 (defvoo nnmh-current-directory nil
  64   "Current news group directory.")
  65
  66 (defvoo nnmh-status-string "")
  67 (defvoo nnmh-group-alist nil)
  68 ;; Don't even think about setting this variable.  It does not exist.
  69 ;; Forget about it.  Uh-huh.  Nope.  Nobody here.  It's only bound
  70 ;; dynamically by certain functions in nndraft.
  71 (defvar nnmh-allow-delete-final nil)
  72
  73 \f
  74
  75 ;;; Interface functions.
  76
  77 (nnoo-define-basics nnmh)
  78
  79 (deffoo nnmh-retrieve-headers (articles &optional newsgroup server fetch-old)
  80   (save-excursion
  81     (set-buffer nntp-server-buffer)
  82     (erase-buffer)
  83     (let* ((file nil)
  84            (number (length articles))
  85            (large (and (numberp nnmail-large-newsgroup)
  86                        (> number nnmail-large-newsgroup)))
  87            (count 0)
  88            (file-name-coding-system nnmail-pathname-coding-system)
  89            beg article)
  90       (nnmh-possibly-change-directory newsgroup server)
  91       ;; We don't support fetching by Message-ID.
  92       (if (stringp (car articles))
  93           'headers
  94         (while articles
  95           (when (and (file-exists-p
  96                       (setq file (concat (file-name-as-directory
  97                                           nnmh-current-directory)
  98                                          (int-to-string
  99                                           (setq article (pop articles))))))
 100                      (not (file-directory-p file)))
 101             (insert (format "221 %d Article retrieved.\n" article))
 102             (setq beg (point))
 103             (nnheader-insert-head file)
 104             (goto-char beg)
 105             (if (search-forward "\n\n" nil t)
 106                 (forward-char -1)
 107               (goto-char (point-max))
 108               (insert "\n\n"))
 109             (insert ".\n")
 110             (delete-region (point) (point-max)))
 111           (setq count (1+ count))
 112
 113           (and large
 114                (zerop (% count 20))
 115                (nnheader-message 5 "nnmh: Receiving headers... %d%%"
 116                                  (/ (* count 100) number))))
 117
 118         (when large
 119           (nnheader-message 5 "nnmh: Receiving headers...done"))
 120
 121         (nnheader-fold-continuation-lines)
 122         'headers))))
 123
 124 (deffoo nnmh-open-server (server &optional defs)
 125   (nnoo-change-server 'nnmh server defs)
 126   (when (not (file-exists-p nnmh-directory))
 127     (condition-case ()
 128         (make-directory nnmh-directory t)
 129       (error t)))
 130   (cond
 131    ((not (file-exists-p nnmh-directory))
 132     (nnmh-close-server)
 133     (nnheader-report 'nnmh "Couldn't create directory: %s" nnmh-directory))
 134    ((not (file-directory-p (file-truename nnmh-directory)))
 135     (nnmh-close-server)
 136     (nnheader-report 'nnmh "Not a directory: %s" nnmh-directory))
 137    (t
 138     (nnheader-report 'nnmh "Opened server %s using directory %s"
 139                      server nnmh-directory)
 140     t)))
 141
 142 (deffoo nnmh-request-article (id &optional newsgroup server buffer)
 143   (nnmh-possibly-change-directory newsgroup server)
 144   (let ((file (if (stringp id)
 145                   nil
 146                 (concat nnmh-current-directory (int-to-string id))))
 147         (file-name-coding-system nnmail-pathname-coding-system)
 148         (nntp-server-buffer (or buffer nntp-server-buffer)))
 149     (and (stringp file)
 150          (file-exists-p file)
 151          (not (file-directory-p file))
 152          (save-excursion (nnmail-find-file file))
 153          (string-to-number (file-name-nondirectory file)))))
 154
 155 (deffoo nnmh-request-group (group &optional server dont-check)
 156   (nnheader-init-server-buffer)
 157   (nnmh-possibly-change-directory group server)
 158   (let ((pathname (nnmail-group-pathname group nnmh-directory))
 159         (file-name-coding-system nnmail-pathname-coding-system)
 160         dir)
 161     (cond
 162      ((not (file-directory-p pathname))
 163       (nnheader-report
 164        'nnmh "Can't select group (no such directory): %s" group))
 165      (t
 166       (setq nnmh-current-directory pathname)
 167       (and nnmh-get-new-mail
 168            nnmh-be-safe
 169            (nnmh-update-gnus-unreads group))
 170       (cond
 171        (dont-check
 172         (nnheader-report 'nnmh "Selected group %s" group)
 173         t)
 174        (t
 175         ;; Re-scan the directory if it's on a foreign system.
 176         (nnheader-re-read-dir pathname)
 177         (setq dir
 178               (sort
 179                (mapcar (lambda (name) (string-to-number name))
 180                        (directory-files pathname nil "^[0-9]+$" t))
 181                '<))
 182         (cond
 183          (dir
 184           (setq nnmh-group-alist
 185                 (delq (assoc group nnmh-group-alist) nnmh-group-alist))
 186           (push (list group (cons (car dir) (car (last dir))))
 187                 nnmh-group-alist)
 188           (nnheader-report 'nnmh "Selected group %s" group)
 189           (nnheader-insert
 190            "211 %d %d %d %s\n" (length dir) (car dir)
 191            (car (last dir)) group))
 192          (t
 193           (nnheader-report 'nnmh "Empty group %s" group)
 194           (nnheader-insert (format "211 0 1 0 %s\n" group))))))))))
 195
 196 (deffoo nnmh-request-scan (&optional group server)
 197   (nnmail-get-new-mail 'nnmh nil nnmh-directory group))
 198
 199 (deffoo nnmh-request-list (&optional server dir)
 200   (nnheader-insert "")
 201   (nnmh-possibly-change-directory nil server)
 202   (let ((file-name-coding-system nnmail-pathname-coding-system)
 203         (nnmh-toplev
 204          (file-truename (or dir (file-name-as-directory nnmh-directory)))))
 205     (nnmh-request-list-1 nnmh-toplev))
 206   (setq nnmh-group-alist (nnmail-get-active))
 207   t)
 208
 209 (defvar nnmh-toplev)
 210 (defun nnmh-request-list-1 (dir)
 211   (setq dir (expand-file-name dir))
 212   ;; Recurse down all directories.
 213   (let ((dirs (and (file-readable-p dir)
 214                    (> (nth 1 (file-attributes (file-chase-links dir))) 2)
 215                    (nnheader-directory-files dir t nil t)))
 216         rdir)
 217     ;; Recurse down directories.
 218     (while (setq rdir (pop dirs))
 219       (when (and (file-directory-p rdir)
 220                  (file-readable-p rdir)
 221                  (not (equal (file-truename rdir)
 222                              (file-truename dir))))
 223         (nnmh-request-list-1 rdir))))
 224   ;; For each directory, generate an active file line.
 225   (unless (string= (expand-file-name nnmh-toplev) dir)
 226     (let ((files (mapcar
 227                   (lambda (name) (string-to-number name))
 228                   (directory-files dir nil "^[0-9]+$" t))))
 229       (when files
 230         (save-excursion
 231           (set-buffer nntp-server-buffer)
 232           (goto-char (point-max))
 233           (insert
 234            (format
 235             "%s %.0f %.0f y\n"
 236             (progn
 237               (string-match
 238                (regexp-quote
 239                 (file-truename (file-name-as-directory
 240                                 (expand-file-name nnmh-toplev))))
 241                dir)
 242               (mm-string-as-multibyte
 243                (mm-encode-coding-string
 244                 (nnheader-replace-chars-in-string
 245                  (substring dir (match-end 0))
 246                  ?/ ?.)
 247                 nnmail-pathname-coding-system)))
 248             (apply 'max files)
 249             (apply 'min files)))))))
 250   t)
 251
 252 (deffoo nnmh-request-newgroups (date &optional server)
 253   (nnmh-request-list server))
 254
 255 (deffoo nnmh-request-expire-articles (articles newsgroup
 256                                                &optional server force)
 257   (nnmh-possibly-change-directory newsgroup server)
 258   (let* ((is-old t)
 259          article rest mod-time)
 260     (nnheader-init-server-buffer)
 261
 262     (while (and articles is-old)
 263       (setq article (concat nnmh-current-directory
 264                             (int-to-string (car articles))))
 265       (when (setq mod-time (nth 5 (file-attributes article)))
 266         (if (and (nnmh-deletable-article-p newsgroup (car articles))
 267                  (setq is-old
 268                        (nnmail-expired-article-p newsgroup mod-time force)))
 269             (progn
 270               ;; Allow a special target group. -- jcn
 271               (unless (eq nnmail-expiry-target 'delete)
 272                 (with-temp-buffer
 273                   (nnmh-request-article (car articles)
 274                                         newsgroup server (current-buffer))
 275                   (nnmail-expiry-target-group
 276                    nnmail-expiry-target newsgroup)))
 277               (nnheader-message 5 "Deleting article %s in %s..."
 278                                 article newsgroup)
 279               (condition-case ()
 280                   (funcall nnmail-delete-file-function article)
 281                 (file-error
 282                  (nnheader-message 1 "Couldn't delete article %s in %s"
 283                                    article newsgroup)
 284                  (push (car articles) rest))))
 285           (push (car articles) rest)))
 286       (setq articles (cdr articles)))
 287     (nnheader-message 5 "")
 288     (nconc rest articles)))
 289
 290 (deffoo nnmh-close-group (group &optional server)
 291   t)
 292
 293 (deffoo nnmh-request-move-article (article group server
 294                                            accept-form &optional last)
 295   (let ((buf (get-buffer-create " *nnmh move*"))
 296         result)
 297     (and
 298      (nnmh-deletable-article-p group article)
 299      (nnmh-request-article article group server)
 300      (save-excursion
 301        (set-buffer buf)
 302        (erase-buffer)
 303        (insert-buffer-substring nntp-server-buffer)
 304        (setq result (eval accept-form))
 305        (kill-buffer (current-buffer))
 306        result)
 307      (progn
 308        (nnmh-possibly-change-directory group server)
 309        (condition-case ()
 310            (funcall nnmail-delete-file-function
 311                     (concat nnmh-current-directory (int-to-string article)))
 312          (file-error nil))))
 313     result))
 314
 315 (deffoo nnmh-request-accept-article (group &optional server last noinsert)
 316   (nnmh-possibly-change-directory group server)
 317   (nnmail-check-syntax)
 318   (when nnmail-cache-accepted-message-ids
 319     (nnmail-cache-insert (nnmail-fetch-field "message-id")
 320                          group
 321                          (nnmail-fetch-field "subject")
 322                          (nnmail-fetch-field "from")))
 323   (nnheader-init-server-buffer)
 324   (prog1
 325       (if (stringp group)
 326           (if noinsert
 327               (nnmh-active-number group)
 328             (car (nnmh-save-mail
 329                   (list (cons group (nnmh-active-number group)))
 330                   noinsert)))
 331         (let ((res (nnmail-article-group 'nnmh-active-number)))
 332           (if (and (null res)
 333                    (yes-or-no-p "Moved to `junk' group; delete article? "))
 334               'junk
 335             (car (nnmh-save-mail res noinsert)))))
 336     (when (and last nnmail-cache-accepted-message-ids)
 337       (nnmail-cache-close))))
 338
 339 (deffoo nnmh-request-replace-article (article group buffer)
 340   (nnmh-possibly-change-directory group)
 341   (save-excursion
 342     (set-buffer buffer)
 343     (nnmh-possibly-create-directory group)
 344     (ignore-errors
 345       (nnmail-write-region
 346        (point-min) (point-max)
 347        (concat nnmh-current-directory (int-to-string article))
 348        nil (if (nnheader-be-verbose 5) nil 'nomesg))
 349       t)))
 350
 351 (deffoo nnmh-request-create-group (group &optional server args)
 352   (nnheader-init-server-buffer)
 353   (unless (assoc group nnmh-group-alist)
 354     (let (active)
 355       (push (list group (setq active (cons 1 0)))
 356             nnmh-group-alist)
 357       (nnmh-possibly-create-directory group)
 358       (nnmh-possibly-change-directory group server)
 359       (let ((articles (mapcar
 360                        (lambda (file)
 361                          (string-to-number file))
 362                        (directory-files
 363                         nnmh-current-directory nil "^[0-9]+$"))))
 364         (when articles
 365           (setcar active (apply 'min articles))
 366           (setcdr active (apply 'max articles))))))
 367   t)
 368
 369 (deffoo nnmh-request-delete-group (group &optional force server)
 370   (nnmh-possibly-change-directory group server)
 371   ;; Delete all articles in GROUP.
 372   (if (not force)
 373       ()                                ; Don't delete the articles.
 374     (let ((articles (directory-files nnmh-current-directory t "^[0-9]+$")))
 375       (while articles
 376         (when (file-writable-p (car articles))
 377           (nnheader-message 5 "Deleting article %s in %s..."
 378                             (car articles) group)
 379           (funcall nnmail-delete-file-function (car articles)))
 380         (setq articles (cdr articles))))
 381     ;; Try to delete the directory itself.
 382     (ignore-errors
 383       (delete-directory nnmh-current-directory)))
 384   ;; Remove the group from all structures.
 385   (setq nnmh-group-alist
 386         (delq (assoc group nnmh-group-alist) nnmh-group-alist)
 387         nnmh-current-directory nil)
 388   t)
 389
 390 (deffoo nnmh-request-rename-group (group new-name &optional server)
 391   (nnmh-possibly-change-directory group server)
 392   (let ((new-dir (nnmail-group-pathname new-name nnmh-directory))
 393         (old-dir (nnmail-group-pathname group nnmh-directory)))
 394     (when (ignore-errors
 395             (make-directory new-dir t)
 396             t)
 397       ;; We move the articles file by file instead of renaming
 398       ;; the directory -- there may be subgroups in this group.
 399       ;; One might be more clever, I guess.
 400       (let ((files (nnheader-article-to-file-alist old-dir)))
 401         (while files
 402           (rename-file
 403            (concat old-dir (cdar files))
 404            (concat new-dir (cdar files)))
 405           (pop files)))
 406       (when (<= (length (directory-files old-dir)) 2)
 407         (ignore-errors
 408           (delete-directory old-dir)))
 409       ;; That went ok, so we change the internal structures.
 410       (let ((entry (assoc group nnmh-group-alist)))
 411         (when entry
 412           (setcar entry new-name))
 413         (setq nnmh-current-directory nil)
 414         t))))
 415
 416 (nnoo-define-skeleton nnmh)
 417
 418 \f
 419 ;;; Internal functions.
 420
 421 (defun nnmh-possibly-change-directory (newsgroup &optional server)
 422   (when (and server
 423              (not (nnmh-server-opened server)))
 424     (nnmh-open-server server))
 425   (when newsgroup
 426     (let ((pathname (nnmail-group-pathname newsgroup nnmh-directory))
 427           (file-name-coding-system nnmail-pathname-coding-system))
 428       (if (file-directory-p pathname)
 429           (setq nnmh-current-directory pathname)
 430         (nnheader-report 'nnmh "Not a directory: %s" nnmh-directory)))))
 431
 432 (defun nnmh-possibly-create-directory (group)
 433   (let (dir dirs)
 434     (setq dir (nnmail-group-pathname group nnmh-directory))
 435     (while (not (file-directory-p dir))
 436       (push dir dirs)
 437       (setq dir (file-name-directory (directory-file-name dir))))
 438     (while dirs
 439       (when (make-directory (directory-file-name (car dirs)))
 440         (error "Could not create directory %s" (car dirs)))
 441       (nnheader-message 5 "Creating mail directory %s" (car dirs))
 442       (setq dirs (cdr dirs)))))
 443
 444 (defun nnmh-save-mail (group-art &optional noinsert)
 445   "Called narrowed to an article."
 446   (unless noinsert
 447     (nnmail-insert-lines)
 448     (nnmail-insert-xref group-art))
 449   (run-hooks 'nnmail-prepare-save-mail-hook)
 450   (run-hooks 'nnmh-prepare-save-mail-hook)
 451   (goto-char (point-min))
 452   (while (looking-at "From ")
 453     (replace-match "X-From-Line: ")
 454     (forward-line 1))
 455   ;; We save the article in all the newsgroups it belongs in.
 456   (let ((ga group-art)
 457         first)
 458     (while ga
 459       (nnmh-possibly-create-directory (caar ga))
 460       (let ((file (concat (nnmail-group-pathname
 461                            (caar ga) nnmh-directory)
 462                           (int-to-string (cdar ga)))))
 463         (if first
 464             ;; It was already saved, so we just make a hard link.
 465             (funcall nnmail-crosspost-link-function first file t)
 466           ;; Save the article.
 467           (nnmail-write-region (point-min) (point-max) file nil nil)
 468           (setq first file)))
 469       (setq ga (cdr ga))))
 470   group-art)
 471
 472 (defun nnmh-active-number (group)
 473   "Compute the next article number in GROUP."
 474   (let ((active (cadr (assoc group nnmh-group-alist)))
 475         (dir (nnmail-group-pathname group nnmh-directory))
 476         (file-name-coding-system nnmail-pathname-coding-system)
 477         file)
 478     (unless active
 479       ;; The group wasn't known to nnmh, so we just create an active
 480       ;; entry for it.
 481       (setq active (cons 1 0))
 482       (push (list group active) nnmh-group-alist)
 483       (unless (file-exists-p dir)
 484         (gnus-make-directory dir))
 485       ;; Find the highest number in the group.
 486       (let ((files (sort
 487                     (mapcar
 488                      (lambda (f)
 489                        (string-to-number f))
 490                      (directory-files dir nil "^[0-9]+$"))
 491                     '>)))
 492         (when files
 493           (setcdr active (car files)))))
 494     (setcdr active (1+ (cdr active)))
 495     (while (or
 496             ;; See whether the file exists...
 497             (file-exists-p
 498              (setq file (concat (nnmail-group-pathname group nnmh-directory)
 499                                 (int-to-string (cdr active)))))
 500             ;; ... or there is a buffer that will make that file exist
 501             ;; in the future.
 502             (get-file-buffer file))
 503       ;; Skip past that file.
 504       (setcdr active (1+ (cdr active))))
 505     (cdr active)))
 506
 507 (defun nnmh-update-gnus-unreads (group)
 508   ;; Go through the .nnmh-articles file and compare with the actual
 509   ;; articles in this folder.  The articles that are "new" will be
 510   ;; marked as unread by Gnus.
 511   (let* ((dir nnmh-current-directory)
 512          (files (sort (mapcar (function (lambda (name) (string-to-number name)))
 513                               (directory-files nnmh-current-directory
 514                                                nil "^[0-9]+$" t))
 515                       '<))
 516          (nnmh-file (concat dir ".nnmh-articles"))
 517          new articles)
 518     ;; Load the .nnmh-articles file.
 519     (when (file-exists-p nnmh-file)
 520       (setq articles
 521             (let (nnmh-newsgroup-articles)
 522               (ignore-errors (load nnmh-file nil t t))
 523               nnmh-newsgroup-articles)))
 524     ;; Add all new articles to the `new' list.
 525     (let ((art files))
 526       (while art
 527         (unless (assq (car art) articles)
 528           (push (car art) new))
 529         (setq art (cdr art))))
 530     ;; Remove all deleted articles.
 531     (let ((art articles))
 532       (while art
 533         (unless (memq (caar art) files)
 534           (setq articles (delq (car art) articles)))
 535         (setq art (cdr art))))
 536     ;; Check whether the articles really are the ones that Gnus thinks
 537     ;; they are by looking at the time-stamps.
 538     (let ((arts articles)
 539           art)
 540       (while (setq art (pop arts))
 541         (when (not (equal
 542                     (nth 5 (file-attributes
 543                             (concat dir (int-to-string (car art)))))
 544                     (cdr art)))
 545           (setq articles (delq art articles))
 546           (push (car art) new))))
 547     ;; Go through all the new articles and add them, and their
 548     ;; time-stamps, to the list.
 549     (setq articles
 550           (nconc articles
 551                  (mapcar
 552                   (lambda (art)
 553                     (cons art
 554                           (nth 5 (file-attributes
 555                                   (concat dir (int-to-string art))))))
 556                   new)))
 557     ;; Make Gnus mark all new articles as unread.
 558     (when new
 559       (gnus-make-articles-unread
 560        (gnus-group-prefixed-name group (list 'nnmh ""))
 561        (setq new (sort new '<))))
 562     ;; Sort the article list with highest numbers first.
 563     (setq articles (sort articles (lambda (art1 art2)
 564                                     (> (car art1) (car art2)))))
 565     ;; Finally write this list back to the .nnmh-articles file.
 566     (with-temp-file nnmh-file
 567       (insert ";; Gnus article active file for " group "\n\n")
 568       (insert "(setq nnmh-newsgroup-articles '")
 569       (gnus-prin1 articles)
 570       (insert ")\n"))))
 571
 572 (defun nnmh-deletable-article-p (group article)
 573   "Say whether ARTICLE in GROUP can be deleted."
 574   (let ((path (concat nnmh-current-directory (int-to-string article))))
 575     ;; Writable.
 576     (and (file-writable-p path)
 577          (or
 578           ;; We can never delete the last article in the group.
 579           (not (eq (cdr (nth 1 (assoc group nnmh-group-alist)))
 580                    article))
 581           ;; Well, we can.
 582           nnmh-allow-delete-final))))
 583
 584 (provide 'nnmh)
 585
 586 ;;; arch-tag: 36c12a98-3bad-44b3-9953-628078ef0e04
 587 ;;; nnmh.el ends here