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|
;;; nnmbox.el --- mail mbox access for Gnus -*- lexical-binding: t; -*-
;; Copyright (C) 1995-2025 Free Software Foundation, Inc.
;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
;; Keywords: news, mail
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; For an overview of what the interface functions do, please see the
;; Gnus sources.
;;; Code:
(require 'nnheader)
(require 'message)
(require 'nnmail)
(require 'nnoo)
(require 'gnus-range)
(nnoo-declare nnmbox)
(defvoo nnmbox-mbox-file (expand-file-name "~/mbox")
"The name of the mail box file in the user's home directory.")
(defvoo nnmbox-active-file (expand-file-name "~/.mbox-active")
"The name of the active file for the mail box.")
(defvoo nnmbox-get-new-mail t
"If non-nil, nnmbox will check the incoming mail file and split the mail.")
(defvoo nnmbox-prepare-save-mail-hook nil
"Hook run narrowed to an article before saving.")
(defconst nnmbox-version "nnmbox 1.0"
"nnmbox version.")
(make-obsolete-variable 'nnmbox-version 'emacs-version "29.1")
(defvoo nnmbox-current-group nil
"Current nnmbox news group directory.")
(defvar nnmbox-mbox-buffer nil)
(defvoo nnmbox-status-string "")
(defvoo nnmbox-group-alist nil)
(defvoo nnmbox-active-timestamp nil)
(defvoo nnmbox-file-coding-system mm-binary-coding-system)
(defvoo nnmbox-file-coding-system-for-write nil)
(defvoo nnmbox-active-file-coding-system mm-binary-coding-system)
(defvoo nnmbox-active-file-coding-system-for-write nil)
(defvar nnmbox-group-building-active-articles nil)
(defvar nnmbox-group-active-articles nil)
;;; Interface functions
(nnoo-define-basics nnmbox)
(deffoo nnmbox-retrieve-headers (sequence &optional newsgroup server _fetch-old)
(with-current-buffer nntp-server-buffer
(erase-buffer)
(let ((number (length sequence))
(count 0)
article start stop)
(nnmbox-possibly-change-newsgroup newsgroup server)
(while sequence
(setq article (car sequence))
(set-buffer nnmbox-mbox-buffer)
(when (nnmbox-find-article article)
(setq start
(save-excursion
(re-search-backward
(concat "^" message-unix-mail-delimiter) nil t)
(point)))
(search-forward "\n\n" nil t)
(setq stop (1- (point)))
(set-buffer nntp-server-buffer)
(insert (format "221 %d Article retrieved.\n" article))
(insert-buffer-substring nnmbox-mbox-buffer start stop)
(goto-char (point-max))
(insert ".\n"))
(setq sequence (cdr sequence))
(setq count (1+ count))
(and (numberp nnmail-large-newsgroup)
(> number nnmail-large-newsgroup)
(zerop (% count 20))
(nnheader-message 5 "nnmbox: Receiving headers... %d%%"
(floor (* count 100.0) number))))
(and (numberp nnmail-large-newsgroup)
(> number nnmail-large-newsgroup)
(nnheader-message 5 "nnmbox: Receiving headers...done"))
(set-buffer nntp-server-buffer)
(nnheader-fold-continuation-lines)
'headers)))
(deffoo nnmbox-open-server (server &optional defs)
(nnoo-change-server 'nnmbox server defs)
(nnmbox-create-mbox)
(cond
((not (file-exists-p nnmbox-mbox-file))
(nnmbox-close-server)
(nnheader-report 'nnmbox "No such file: %s" nnmbox-mbox-file))
((file-directory-p nnmbox-mbox-file)
(nnmbox-close-server)
(nnheader-report 'nnmbox "Not a regular file: %s" nnmbox-mbox-file))
(t
(nnheader-report 'nnmbox "Opened server %s using mbox %s" server
nnmbox-mbox-file)
t)))
(deffoo nnmbox-close-server (&optional server _defs)
(when (buffer-live-p nnmbox-mbox-buffer)
(kill-buffer nnmbox-mbox-buffer))
(nnoo-close-server 'nnmbox server)
t)
(deffoo nnmbox-server-opened (&optional server)
(and (nnoo-current-server-p 'nnmbox server)
(buffer-live-p nnmbox-mbox-buffer)
(buffer-live-p nntp-server-buffer)))
(deffoo nnmbox-request-article (article &optional newsgroup server buffer)
(nnmbox-possibly-change-newsgroup newsgroup server)
(with-current-buffer nnmbox-mbox-buffer
(save-excursion
(when (nnmbox-find-article article)
(let (start stop)
(re-search-backward (concat "^" message-unix-mail-delimiter) nil t)
(setq start (point))
(forward-line 1)
(setq stop (if (re-search-forward (concat "^"
message-unix-mail-delimiter)
nil 'move)
(match-beginning 0)
(point)))
(let ((nntp-server-buffer (or buffer nntp-server-buffer)))
(set-buffer nntp-server-buffer)
(erase-buffer)
(insert-buffer-substring nnmbox-mbox-buffer start stop)
(goto-char (point-min))
(while (looking-at "From ")
(delete-char 5)
(insert "X-From-Line: ")
(forward-line 1))
(if (numberp article)
(cons nnmbox-current-group article)
(nnmbox-article-group-number nil))))))))
(deffoo nnmbox-request-group (group &optional server dont-check _info)
(nnmbox-possibly-change-newsgroup nil server)
(let ((active (cadr (assoc group nnmbox-group-alist))))
(cond
((or (null active)
(null (nnmbox-possibly-change-newsgroup group server)))
(nnheader-report 'nnmbox "No such group: %s" group))
(dont-check
(nnheader-report 'nnmbox "Selected group %s" group)
(nnheader-insert ""))
(t
(nnheader-report 'nnmbox "Selected group %s" group)
(nnheader-insert "211 %d %d %d %s\n"
(1+ (- (cdr active) (car active)))
(car active) (cdr active) group)))))
(defun nnmbox-save-buffer ()
(let ((coding-system-for-write
(or nnmbox-file-coding-system-for-write
nnmbox-file-coding-system)))
(save-buffer)))
(defun nnmbox-save-active (group-alist active-file)
(let ((nnmail-active-file-coding-system
(or nnmbox-active-file-coding-system-for-write
nnmbox-active-file-coding-system)))
(nnmail-save-active group-alist active-file)))
(deffoo nnmbox-request-scan (&optional group server)
(nnmbox-possibly-change-newsgroup group server)
(nnmbox-read-mbox)
(nnmail-get-new-mail
'nnmbox
(lambda ()
(with-current-buffer nnmbox-mbox-buffer
(nnmbox-save-buffer)))
(file-name-directory nnmbox-mbox-file)
group
(lambda ()
(let ((in-buf (current-buffer)))
(with-current-buffer nnmbox-mbox-buffer
(goto-char (point-max))
(insert-buffer-substring in-buf)))
(nnmbox-save-active nnmbox-group-alist nnmbox-active-file))))
(deffoo nnmbox-close-group (_group &optional _server)
t)
(deffoo nnmbox-request-create-group (group &optional _server _args)
(nnmail-activate 'nnmbox)
(unless (assoc group nnmbox-group-alist)
(push (list group (cons 1 0))
nnmbox-group-alist)
(nnmbox-save-active nnmbox-group-alist nnmbox-active-file))
t)
(deffoo nnmbox-request-list (&optional _server)
(save-excursion
(let ((nnmail-file-coding-system
nnmbox-active-file-coding-system))
(nnmail-find-file nnmbox-active-file))
(setq nnmbox-group-alist (nnmail-get-active))
t))
(deffoo nnmbox-request-newgroups (_date &optional server)
(nnmbox-request-list server))
(deffoo nnmbox-request-list-newsgroups (&optional _server)
(nnheader-report 'nnmbox "LIST NEWSGROUPS is not implemented."))
(defvar nnml-current-directory)
(deffoo nnmbox-request-expire-articles
(articles newsgroup &optional server force)
(nnmbox-possibly-change-newsgroup newsgroup server)
(let* ((is-old t)
rest)
(nnmail-activate 'nnmbox)
(with-current-buffer nnmbox-mbox-buffer
(while (and articles is-old)
(when (nnmbox-find-article (car articles))
(if (setq is-old
(nnmail-expired-article-p
newsgroup
(buffer-substring (point) (line-end-position))
force))
(progn
(unless (eq nnmail-expiry-target 'delete)
(with-temp-buffer
(nnmbox-request-article (car articles)
newsgroup server
(current-buffer))
(let ((nnml-current-directory nil))
(nnmail-expiry-target-group
nnmail-expiry-target newsgroup)))
(nnmbox-possibly-change-newsgroup newsgroup server))
(nnheader-message 5 "Deleting article %d in %s..."
(car articles) newsgroup)
(nnmbox-delete-mail))
(push (car articles) rest)))
(setq articles (cdr articles)))
(nnmbox-save-buffer)
;; Find the lowest active article in this group.
(let ((active (nth 1 (assoc newsgroup nnmbox-group-alist))))
(while (and (not (nnmbox-find-article (car active)))
(<= (car active) (cdr active)))
(setcar active (1+ (car active)))))
(nnmbox-save-active nnmbox-group-alist nnmbox-active-file)
(nconc rest articles))))
(deffoo nnmbox-request-move-article
(article group server accept-form &optional last _move-is-internal)
(let ((buf (gnus-get-buffer-create " *nnmbox move*"))
result)
(and
(nnmbox-request-article article group server)
(with-current-buffer buf
(erase-buffer)
(insert-buffer-substring nntp-server-buffer)
(goto-char (point-min))
(while (re-search-forward
"^X-Gnus-Newsgroup:"
(save-excursion (search-forward "\n\n" nil t) (point)) t)
(gnus-delete-line))
(setq result (eval accept-form t))
(kill-buffer buf)
result)
(save-excursion
(nnmbox-possibly-change-newsgroup group server)
(set-buffer nnmbox-mbox-buffer)
(when (nnmbox-find-article article)
(nnmbox-delete-mail))
(and last (nnmbox-save-buffer))))
result))
(deffoo nnmbox-request-accept-article (group &optional server last)
(nnmbox-possibly-change-newsgroup group server)
(nnmail-check-syntax)
(let ((buf (current-buffer))
result cont)
(and
(nnmail-activate 'nnmbox)
(with-temp-buffer
(insert-buffer-substring buf)
(goto-char (point-min))
(cond (;; The From line may have been quoted by movemail.
(looking-at (concat ">" message-unix-mail-delimiter))
(delete-char 1)
(forward-line 1))
((looking-at "X-From-Line: ")
(replace-match "From ")
(forward-line 1))
(t
(insert "From nobody " (current-time-string) "\n")))
(narrow-to-region (point)
(if (search-forward "\n\n" nil 'move)
(1- (point))
(point)))
(while (re-search-backward "^X-Gnus-Newsgroup: " nil t)
(delete-region (point) (progn (forward-line 1) (point))))
(when nnmail-cache-accepted-message-ids
(nnmail-cache-insert (message-fetch-field "message-id")
group
(message-fetch-field "subject")
(message-fetch-field "from")))
(widen)
(setq result (if (stringp group)
(list (cons group (nnmbox-active-number group)))
(nnmail-article-group 'nnmbox-active-number)))
(prog1
(if (and (null result)
(yes-or-no-p "Moved to `junk' group; delete article? "))
(setq result 'junk)
(setq result (car (nnmbox-save-mail result))))
(setq cont (buffer-string))))
(with-current-buffer nnmbox-mbox-buffer
(goto-char (point-max))
(insert cont)
(when last
(when nnmail-cache-accepted-message-ids
(nnmail-cache-close))
(nnmbox-save-active nnmbox-group-alist nnmbox-active-file)
(nnmbox-save-buffer))))
result))
(deffoo nnmbox-request-replace-article (article group buffer)
(nnmbox-possibly-change-newsgroup group)
(with-current-buffer nnmbox-mbox-buffer
(if (not (nnmbox-find-article article))
nil
(nnmbox-delete-mail t t)
(insert
(with-temp-buffer
(insert-buffer-substring buffer)
(goto-char (point-min))
(when (looking-at "X-From-Line:")
(delete-region (point) (progn (forward-line 1) (point))))
(while (re-search-forward (concat "^" message-unix-mail-delimiter)
nil t)
(goto-char (match-beginning 0))
(insert ">"))
(goto-char (point-max))
(unless (bolp)
(insert "\n"))
(buffer-string)))
(nnmbox-save-buffer)
t)))
(deffoo nnmbox-request-delete-group (group &optional force server)
(nnmbox-possibly-change-newsgroup group server)
;; Delete all articles in GROUP.
(if (not force)
() ; Don't delete the articles.
(with-current-buffer nnmbox-mbox-buffer
(goto-char (point-min))
;; Delete all articles in this group.
(let ((ident (concat "\nX-Gnus-Newsgroup: " nnmbox-current-group ":"))
found)
(while (search-forward ident nil t)
(setq found t)
(nnmbox-delete-mail))
(when found
(nnmbox-save-buffer)))))
;; Remove the group from all structures.
(setq nnmbox-group-alist
(delq (assoc group nnmbox-group-alist) nnmbox-group-alist)
nnmbox-current-group nil)
;; Save the active file.
(nnmbox-save-active nnmbox-group-alist nnmbox-active-file)
t)
(deffoo nnmbox-request-rename-group (group new-name &optional server)
(nnmbox-possibly-change-newsgroup group server)
(with-current-buffer nnmbox-mbox-buffer
(goto-char (point-min))
(let ((ident (concat "\nX-Gnus-Newsgroup: " nnmbox-current-group ":"))
(new-ident (concat "\nX-Gnus-Newsgroup: " new-name ":"))
found)
(while (search-forward ident nil t)
(replace-match new-ident t t)
(setq found t))
(when found
(nnmbox-save-buffer))))
(let ((entry (assoc group nnmbox-group-active-articles)))
(when entry
(setcar entry new-name)))
(let ((entry (assoc group nnmbox-group-alist)))
(when entry
(setcar entry new-name))
(setq nnmbox-current-group nil)
;; Save the new group alist.
(nnmbox-save-active nnmbox-group-alist nnmbox-active-file)
t))
;;; Internal functions.
;; If FORCE, delete article no matter how many X-Gnus-Newsgroup
;; headers there are. If LEAVE-DELIM, don't delete the Unix mbox
;; delimiter line.
(defun nnmbox-delete-mail (&optional force leave-delim)
;; Delete the current X-Gnus-Newsgroup line.
;; First delete record of active article, unless the article is being
;; replaced, indicated by FORCE being non-nil.
(if (not force)
(nnmbox-record-deleted-article (nnmbox-article-group-number t)))
(or force
(gnus-delete-line))
;; Beginning of the article.
(save-excursion
(save-restriction
(narrow-to-region
(prog2
(re-search-backward (concat "^" message-unix-mail-delimiter) nil t)
(if leave-delim (progn (forward-line 1) (point))
(match-beginning 0))
(forward-line 1))
(or (and (re-search-forward (concat "^" message-unix-mail-delimiter)
nil t)
(match-beginning 0))
(point-max)))
(goto-char (point-min))
;; Only delete the article if no other group owns it as well.
(when (or force
(not (re-search-forward "^X-Gnus-Newsgroup: " nil t))
(search-backward "\n\n" nil t))
(delete-region (point-min) (point-max))))))
(defun nnmbox-possibly-change-newsgroup (newsgroup &optional server)
(when (and server
(not (nnmbox-server-opened server)))
(nnmbox-open-server server))
(unless (buffer-live-p nnmbox-mbox-buffer)
(nnmbox-read-mbox))
(when (not nnmbox-group-alist)
(nnmail-activate 'nnmbox))
(if newsgroup
(when (assoc newsgroup nnmbox-group-alist)
(setq nnmbox-current-group newsgroup))
t))
(defun nnmbox-article-string (article)
(if (numberp article)
(concat "\nX-Gnus-Newsgroup: " nnmbox-current-group ":"
(int-to-string article) " ")
(concat "\nMessage-ID: " article)))
(defun nnmbox-article-group-number (this-line)
(save-excursion
(if this-line
(beginning-of-line)
(goto-char (point-min)))
(when (re-search-forward "^X-Gnus-Newsgroup: +\\([^:]+\\):\\([0-9]+\\) "
nil t)
(cons (buffer-substring (match-beginning 1) (match-end 1))
(string-to-number
(buffer-substring (match-beginning 2) (match-end 2)))))))
(defun nnmbox-in-header-p (pos)
"Return non-nil if POS is in the header of an article."
(save-excursion
(goto-char pos)
(re-search-backward (concat "^" message-unix-mail-delimiter) nil t)
(search-forward "\n\n" nil t)
(< pos (point))))
(defun nnmbox-find-article (article)
"Leaves point on the relevant X-Gnus-Newsgroup line if found."
;; Check that article is in the active range first, to avoid an
;; expensive exhaustive search if it isn't.
(if (and (numberp article)
(not (nnmbox-is-article-active-p article)))
nil
(let ((art-string (nnmbox-article-string article))
(found nil))
;; There is the possibility that the X-Gnus-Newsgroup line appears
;; in the body of an article (for instance, if an article has been
;; forwarded from someone using Gnus as their mailer), so check
;; that the line is actually part of the article header.
(or (and (search-forward art-string nil t)
(nnmbox-in-header-p (point)))
(progn
(goto-char (point-min))
(while (and (not found)
(search-forward art-string nil t))
(setq found (nnmbox-in-header-p (point))))
found)))))
(defun nnmbox-record-active-article (group-art)
(let* ((group (car group-art))
(article (cdr group-art))
(entry
(or (assoc group nnmbox-group-active-articles)
(progn
(push (list group)
nnmbox-group-active-articles)
(car nnmbox-group-active-articles)))))
;; add article to index, either by building complete list
;; in reverse order, or as a list of ranges.
(if (not nnmbox-group-building-active-articles)
(setcdr entry (range-add-list (cdr entry) (list article)))
(when (memq article (cdr entry))
(switch-to-buffer nnmbox-mbox-buffer)
(error "Article %s:%d already exists!" group article))
(when (and (cadr entry) (< article (cadr entry)))
(switch-to-buffer nnmbox-mbox-buffer)
(error "Article %s:%d out of order" group article))
(setcdr entry (cons article (cdr entry))))))
(defun nnmbox-record-deleted-article (group-art)
(let* ((group (car group-art))
(article (cdr group-art))
(entry
(or (assoc group nnmbox-group-active-articles)
(progn
(push (list group)
nnmbox-group-active-articles)
(car nnmbox-group-active-articles)))))
;; remove article from index
(setcdr entry (range-remove (cdr entry) (list article)))))
(defun nnmbox-is-article-active-p (article)
(range-member-p
article
(cdr (assoc nnmbox-current-group
nnmbox-group-active-articles))))
(defun nnmbox-save-mail (group-art)
"Called narrowed to an article."
(let ((delim (concat "^" message-unix-mail-delimiter)))
(goto-char (point-min))
;; This might come from somewhere else.
(if (looking-at delim)
(forward-line 1)
(insert "From nobody " (current-time-string) "\n"))
;; Quote all "From " lines in the article.
(while (re-search-forward delim nil t)
(goto-char (match-beginning 0))
(insert ">")))
(goto-char (point-max))
(unless (bolp)
(insert "\n"))
(nnmail-insert-lines)
(nnmail-insert-xref group-art)
(nnmbox-insert-newsgroup-line group-art)
(let ((alist group-art))
(while alist
(nnmbox-record-active-article (car alist))
(setq alist (cdr alist))))
(run-hooks 'nnmail-prepare-save-mail-hook)
(run-hooks 'nnmbox-prepare-save-mail-hook)
group-art)
(defun nnmbox-insert-newsgroup-line (group-art)
(save-excursion
(goto-char (point-min))
(when (search-forward "\n\n" nil t)
(forward-char -1)
(while group-art
(insert (format "X-Gnus-Newsgroup: %s:%d %s\n"
(caar group-art) (cdar group-art)
(current-time-string)))
(setq group-art (cdr group-art))))
t))
(defun nnmbox-active-number (group)
;; Find the next article number in GROUP.
(let ((active (cadr (assoc group nnmbox-group-alist))))
(if active
(setcdr active (1+ (cdr active)))
;; This group is new, so we create a new entry for it.
;; This might be a bit naughty... creating groups on the drop of
;; a hat, but I don't know...
(push (list group (setq active (cons 1 1)))
nnmbox-group-alist))
(cdr active)))
(defun nnmbox-create-mbox ()
(when (not (file-exists-p nnmbox-mbox-file))
(let ((nnmail-file-coding-system
(or nnmbox-file-coding-system-for-write
nnmbox-file-coding-system))
(dir (file-name-directory nnmbox-mbox-file)))
(and dir (gnus-make-directory dir))
(nnmail-write-region (point-min) (point-min)
nnmbox-mbox-file t 'nomesg nil 'excl))))
(defun nnmbox-read-mbox ()
(nnmail-activate 'nnmbox)
(nnmbox-create-mbox)
(if (and (buffer-live-p nnmbox-mbox-buffer)
(with-current-buffer nnmbox-mbox-buffer
(= (buffer-size) (nnheader-file-size nnmbox-mbox-file))))
()
(let ((delim (concat "^" message-unix-mail-delimiter))
(alist nnmbox-group-alist)
(nnmbox-group-building-active-articles t)
start end end-header number)
(with-current-buffer (setq nnmbox-mbox-buffer
(let ((nnheader-file-coding-system
nnmbox-file-coding-system))
(nnheader-find-file-noselect
nnmbox-mbox-file t t)))
(mm-enable-multibyte)
(buffer-disable-undo)
(gnus-add-buffer)
;; Go through the group alist and compare against the mbox file.
(while alist
(goto-char (point-max))
(when (and (re-search-backward
(format "^X-Gnus-Newsgroup: %s:\\([0-9]+\\) "
(caar alist)) nil t)
(> (setq number
(string-to-number
(buffer-substring
(match-beginning 1) (match-end 1))))
(cdadar alist)))
(setcdr (cadar alist) number))
(setq alist (cdr alist)))
;; Examine all articles for our private X-Gnus-Newsgroup
;; headers. This is done primarily as a consistency check, but
;; it is convenient for building an index of the articles
;; present, to avoid costly searches for missing articles
;; (eg. when expiring articles).
(goto-char (point-min))
(setq nnmbox-group-active-articles nil)
(while (re-search-forward delim nil t)
(setq start (match-beginning 0))
(save-excursion
(search-forward "\n\n" nil t)
(setq end-header (point))
(setq end (or (and
(re-search-forward delim nil t)
(match-beginning 0))
(point-max))))
(if (search-forward "\nX-Gnus-Newsgroup: " end-header t)
;; Build a list of articles in each group, remembering
;; that each article may be in more than one group.
(progn
(nnmbox-record-active-article (nnmbox-article-group-number t))
(while (search-forward "\nX-Gnus-Newsgroup: " end-header t)
(nnmbox-record-active-article (nnmbox-article-group-number t))))
;; The article is either new, or for some other reason
;; hasn't got our private headers, so add them now. The
;; only situation I've encountered when the X-Gnus-Newsgroup
;; header is missing is if the article contains a forwarded
;; message which does contain that header line (earlier
;; versions of Gnus didn't restrict their search to the
;; headers). In this case, there is an Xref line which
;; provides the relevant information to construct the
;; missing header(s).
(save-excursion
(save-restriction
(narrow-to-region start end)
(if (re-search-forward "\nXref: [^ ]+" end-header t)
;; generate headers from Xref:
(let (alist)
(while (re-search-forward " \\([^:]+\\):\\([0-9]+\\)" end-header t)
(push (cons (match-string 1)
(string-to-number (match-string 2))) alist))
(nnmbox-insert-newsgroup-line alist))
;; this is really a new article
(nnmbox-save-mail
(nnmail-article-group 'nnmbox-active-number))))))
(goto-char end))
;; put article lists in order
(setq alist nnmbox-group-active-articles)
(while alist
(setcdr (car alist) (gnus-compress-sequence (nreverse (cdar alist))))
(setq alist (cdr alist)))))))
(provide 'nnmbox)
;;; nnmbox.el ends here
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