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emacs/lisp/nnmh.el

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;;; nnmh.el --- mhspool access for Gnus
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;; Copyright (C) 1995,96 Free Software Foundation, Inc.
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;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
;; 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 2, 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
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;; along with GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
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;;; Commentary:
;; Based on nnspool.el by Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>.
;; For an overview of what the interface functions do, please see the
;; Gnus sources.
;;; Code:
(require 'nnheader)
(require 'nnmail)
(require 'gnus)
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(require 'nnoo)
(eval-and-compile (require 'cl))
(nnoo-declare nnmh)
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(defvoo nnmh-directory message-directory
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"*Mail spool directory.")
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(defvoo nnmh-get-new-mail t
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"*If non-nil, nnmh will check the incoming mail file and split the mail.")
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(defvoo nnmh-prepare-save-mail-hook nil
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"*Hook run narrowed to an article before saving.")
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(defvoo nnmh-be-safe nil
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"*If non-nil, nnmh will check all articles to make sure whether they are new or not.")
(defconst nnmh-version "nnmh 1.0"
"nnmh version.")
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(defvoo nnmh-current-directory nil
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"Current news group directory.")
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(defvoo nnmh-status-string "")
(defvoo nnmh-group-alist nil)
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;;; Interface functions.
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(nnoo-define-basics nnmh)
(deffoo nnmh-retrieve-headers (articles &optional newsgroup server fetch-old)
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(save-excursion
(set-buffer nntp-server-buffer)
(erase-buffer)
(let* ((file nil)
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(number (length articles))
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(large (and (numberp nnmail-large-newsgroup)
(> number nnmail-large-newsgroup)))
(count 0)
beg article)
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(nnmh-possibly-change-directory newsgroup server)
;; We don't support fetching by Message-ID.
(if (stringp (car articles))
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'headers
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(while articles
(when (and (file-exists-p
(setq file (concat (file-name-as-directory
nnmh-current-directory)
(int-to-string
(setq article (pop articles))))))
(not (file-directory-p file)))
(insert (format "221 %d Article retrieved.\n" article))
(setq beg (point))
(nnheader-insert-head file)
(goto-char beg)
(if (search-forward "\n\n" nil t)
(forward-char -1)
(goto-char (point-max))
(insert "\n\n"))
(insert ".\n")
(delete-region (point) (point-max)))
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(setq count (1+ count))
(and large
(zerop (% count 20))
(message "nnmh: Receiving headers... %d%%"
(/ (* count 100) number))))
(and large (message "nnmh: Receiving headers...done"))
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(nnheader-fold-continuation-lines)
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'headers))))
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(deffoo nnmh-open-server (server &optional defs)
(nnoo-change-server 'nnmh server defs)
(when (not (file-exists-p nnmh-directory))
(condition-case ()
(make-directory nnmh-directory t)
(error t)))
(cond
((not (file-exists-p nnmh-directory))
(nnmh-close-server)
(nnheader-report 'nnmh "Couldn't create directory: %s" nnmh-directory))
((not (file-directory-p (file-truename nnmh-directory)))
(nnmh-close-server)
(nnheader-report 'nnmh "Not a directory: %s" nnmh-directory))
(t
(nnheader-report 'nnmh "Opened server %s using directory %s"
server nnmh-directory)
t)))
(deffoo nnmh-request-article (id &optional newsgroup server buffer)
(nnmh-possibly-change-directory newsgroup server)
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(let ((file (if (stringp id)
nil
(concat nnmh-current-directory (int-to-string id))))
(nntp-server-buffer (or buffer nntp-server-buffer)))
(and (stringp file)
(file-exists-p file)
(not (file-directory-p file))
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(save-excursion (nnmail-find-file file))
(string-to-int (file-name-nondirectory file)))))
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(deffoo nnmh-request-group (group &optional server dont-check)
(let ((pathname (nnmail-group-pathname group nnmh-directory))
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dir)
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(cond
((not (file-directory-p pathname))
(nnheader-report
'nnmh "Can't select group (no such directory): %s" group))
(t
(setq nnmh-current-directory pathname)
(and nnmh-get-new-mail
nnmh-be-safe
(nnmh-update-gnus-unreads group))
(cond
(dont-check
(nnheader-report 'nnmh "Selected group %s" group)
t)
(t
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;; Re-scan the directory if it's on a foreign system.
(nnheader-re-read-dir pathname)
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(setq dir
(sort
(mapcar (lambda (name) (string-to-int name))
(directory-files pathname nil "^[0-9]+$" t))
'<))
(cond
(dir
(nnheader-report 'nnmh "Selected group %s" group)
(nnheader-insert
"211 %d %d %d %s\n" (length dir) (car dir)
(progn (while (cdr dir) (setq dir (cdr dir))) (car dir))
group))
(t
(nnheader-report 'nnmh "Empty group %s" group)
(nnheader-insert (format "211 0 1 0 %s\n" group))))))))))
(deffoo nnmh-request-scan (&optional group server)
(nnmail-get-new-mail 'nnmh nil nnmh-directory group))
(deffoo nnmh-request-list (&optional server dir)
(nnheader-insert "")
(let ((nnmh-toplev
(or dir (file-truename (file-name-as-directory nnmh-directory)))))
(nnmh-request-list-1 nnmh-toplev))
(setq nnmh-group-alist (nnmail-get-active))
t)
(defvar nnmh-toplev)
(defun nnmh-request-list-1 (dir)
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(setq dir (expand-file-name dir))
;; Recurse down all directories.
(let ((dirs (and (file-readable-p dir)
(> (nth 1 (file-attributes (file-chase-links dir))) 2)
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(directory-files dir t nil t)))
dir)
;; Recurse down directories.
(while (setq dir (pop dirs))
(when (and (not (member (file-name-nondirectory dir) '("." "..")))
(file-directory-p dir)
(file-readable-p dir))
(nnmh-request-list-1 dir))))
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;; For each directory, generate an active file line.
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(unless (string= (expand-file-name nnmh-toplev) dir)
(let ((files (mapcar
(lambda (name) (string-to-int name))
(directory-files dir nil "^[0-9]+$" t))))
(when files
(save-excursion
(set-buffer nntp-server-buffer)
(goto-char (point-max))
(insert
(format
"%s %d %d y\n"
(progn
(string-match
(regexp-quote
(file-truename (file-name-as-directory
(expand-file-name nnmh-toplev)))) dir)
(nnheader-replace-chars-in-string
(substring dir (match-end 0)) ?/ ?.))
(apply 'max files)
(apply 'min files)))))))
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t)
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(deffoo nnmh-request-newgroups (date &optional server)
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(nnmh-request-list server))
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(deffoo nnmh-request-expire-articles (articles newsgroup &optional server force)
(nnmh-possibly-change-directory newsgroup server)
(let* ((active-articles
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(mapcar
(function
(lambda (name)
(string-to-int name)))
(directory-files nnmh-current-directory nil "^[0-9]+$" t)))
(is-old t)
article rest mod-time)
(nnmail-activate 'nnmh)
(while (and articles is-old)
(setq article (concat nnmh-current-directory
(int-to-string (car articles))))
(if (setq mod-time (nth 5 (file-attributes article)))
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(if (and (nnmh-deletable-article-p newsgroup (car articles))
(setq is-old
(nnmail-expired-article-p newsgroup mod-time force)))
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(progn
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(nnheader-message 5 "Deleting article %s in %s..."
article newsgroup)
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(condition-case ()
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(funcall nnmail-delete-file-function article)
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(file-error
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(nnheader-message 1 "Couldn't delete article %s in %s"
article newsgroup)
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(setq rest (cons (car articles) rest)))))
(setq rest (cons (car articles) rest))))
(setq articles (cdr articles)))
(message "")
(nconc rest articles)))
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(deffoo nnmh-close-group (group &optional server)
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t)
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(deffoo nnmh-request-move-article
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(article group server accept-form &optional last)
(let ((buf (get-buffer-create " *nnmh move*"))
result)
(and
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(nnmh-deletable-article-p group article)
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(nnmh-request-article article group server)
(save-excursion
(set-buffer buf)
(insert-buffer-substring nntp-server-buffer)
(setq result (eval accept-form))
(kill-buffer (current-buffer))
result)
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(progn
(nnmh-possibly-change-directory group server)
(condition-case ()
(funcall nnmail-delete-file-function
(concat nnmh-current-directory (int-to-string article)))
(file-error nil))))
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result))
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(deffoo nnmh-request-accept-article (group &optional server last noinsert)
(nnmh-possibly-change-directory group server)
(nnmail-check-syntax)
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(if (stringp group)
(and
(nnmail-activate 'nnmh)
;; We trick the choosing function into believing that only one
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;; group is available.
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(let ((nnmail-split-methods (list (list group ""))))
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(car (nnmh-save-mail noinsert))))
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(and
(nnmail-activate 'nnmh)
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(car (nnmh-save-mail noinsert)))))
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(deffoo nnmh-request-replace-article (article group buffer)
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(nnmh-possibly-change-directory group)
(save-excursion
(set-buffer buffer)
(nnmh-possibly-create-directory group)
(condition-case ()
(progn
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(write-region
(point-min) (point-max)
(concat nnmh-current-directory (int-to-string article))
nil (if (nnheader-be-verbose 5) nil 'nomesg))
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t)
(error nil))))
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(deffoo nnmh-request-create-group (group &optional server)
(nnmail-activate 'nnmh)
(or (assoc group nnmh-group-alist)
(let (active)
(setq nnmh-group-alist (cons (list group (setq active (cons 1 0)))
nnmh-group-alist))
(nnmh-possibly-create-directory group)
(nnmh-possibly-change-directory group server)
(let ((articles (mapcar
(lambda (file)
(string-to-int file))
(directory-files
nnmh-current-directory nil "^[0-9]+$"))))
(and articles
(progn
(setcar active (apply 'min articles))
(setcdr active (apply 'max articles)))))))
t)
(deffoo nnmh-request-delete-group (group &optional force server)
(nnmh-possibly-change-directory group server)
;; Delete all articles in GROUP.
(if (not force)
() ; Don't delete the articles.
(let ((articles (directory-files nnmh-current-directory t "^[0-9]+$")))
(while articles
(and (file-writable-p (car articles))
(progn
(nnheader-message 5 "Deleting article %s in %s..."
(car articles) group)
(funcall nnmail-delete-file-function (car articles))))
(setq articles (cdr articles))))
;; Try to delete the directory itself.
(condition-case ()
(delete-directory nnmh-current-directory)
(error nil)))
;; Remove the group from all structures.
(setq nnmh-group-alist
(delq (assoc group nnmh-group-alist) nnmh-group-alist)
nnmh-current-directory nil)
t)
(deffoo nnmh-request-rename-group (group new-name &optional server)
(nnmh-possibly-change-directory group server)
;; Rename directory.
(and (file-writable-p nnmh-current-directory)
(condition-case ()
(progn
(rename-file
(directory-file-name nnmh-current-directory)
(directory-file-name
(nnmail-group-pathname new-name nnmh-directory)))
t)
(error nil))
;; That went ok, so we change the internal structures.
(let ((entry (assoc group nnmh-group-alist)))
(and entry (setcar entry new-name))
(setq nnmh-current-directory nil)
t)))
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;;; Internal functions.
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(defun nnmh-possibly-change-directory (newsgroup &optional server)
(when (and server
(not (nnmh-server-opened server)))
(nnmh-open-server server))
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(if newsgroup
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(let ((pathname (nnmail-group-pathname newsgroup nnmh-directory)))
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(if (file-directory-p pathname)
(setq nnmh-current-directory pathname)
(error "No such newsgroup: %s" newsgroup)))))
(defun nnmh-possibly-create-directory (group)
(let (dir dirs)
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(setq dir (nnmail-group-pathname group nnmh-directory))
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(while (not (file-directory-p dir))
(setq dirs (cons dir dirs))
(setq dir (file-name-directory (directory-file-name dir))))
(while dirs
(if (make-directory (directory-file-name (car dirs)))
(error "Could not create directory %s" (car dirs)))
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(nnheader-message 5 "Creating mail directory %s" (car dirs))
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(setq dirs (cdr dirs)))))
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(defun nnmh-save-mail (&optional noinsert)
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"Called narrowed to an article."
(let ((group-art (nreverse (nnmail-article-group 'nnmh-active-number))))
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(unless noinsert
(nnmail-insert-lines)
(nnmail-insert-xref group-art))
(run-hooks 'nnmail-prepare-save-mail-hook)
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(run-hooks 'nnmh-prepare-save-mail-hook)
(goto-char (point-min))
(while (looking-at "From ")
(replace-match "X-From-Line: ")
(forward-line 1))
;; We save the article in all the newsgroups it belongs in.
(let ((ga group-art)
first)
(while ga
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(nnmh-possibly-create-directory (caar ga))
(let ((file (concat (nnmail-group-pathname
(caar ga) nnmh-directory)
(int-to-string (cdar ga)))))
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(if first
;; It was already saved, so we just make a hard link.
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(funcall nnmail-crosspost-link-function first file t)
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;; Save the article.
(write-region (point-min) (point-max) file nil nil)
(setq first file)))
(setq ga (cdr ga))))
group-art))
(defun nnmh-active-number (group)
"Compute the next article number in GROUP."
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(let ((active (cadr (assoc group nnmh-group-alist))))
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;; The group wasn't known to nnmh, so we just create an active
;; entry for it.
(or active
(progn
(setq active (cons 1 0))
(setq nnmh-group-alist (cons (list group active) nnmh-group-alist))))
(setcdr active (1+ (cdr active)))
(while (file-exists-p
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(concat (nnmail-group-pathname group nnmh-directory)
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(int-to-string (cdr active))))
(setcdr active (1+ (cdr active))))
(cdr active)))
(defun nnmh-update-gnus-unreads (group)
;; Go through the .nnmh-articles file and compare with the actual
;; articles in this folder. The articles that are "new" will be
;; marked as unread by Gnus.
(let* ((dir nnmh-current-directory)
(files (sort (mapcar (function (lambda (name) (string-to-int name)))
(directory-files nnmh-current-directory
nil "^[0-9]+$" t)) '<))
(nnmh-file (concat dir ".nnmh-articles"))
new articles)
;; Load the .nnmh-articles file.
(if (file-exists-p nnmh-file)
(setq articles
(let (nnmh-newsgroup-articles)
(condition-case nil (load nnmh-file nil t t) (error nil))
nnmh-newsgroup-articles)))
;; Add all new articles to the `new' list.
(let ((art files))
(while art
(if (not (assq (car art) articles)) (setq new (cons (car art) new)))
(setq art (cdr art))))
;; Remove all deleted articles.
(let ((art articles))
(while art
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(if (not (memq (caar art) files))
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(setq articles (delq (car art) articles)))
(setq art (cdr art))))
;; Check whether the highest-numbered articles really are the ones
;; that Gnus thinks they are by looking at the time-stamps.
(let ((art articles))
(while (and art
(not (equal
(nth 5 (file-attributes
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(concat dir (int-to-string (caar art)))))
(cdar art))))
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(setq articles (delq (car art) articles))
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(setq new (cons (caar art) new))
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(setq art (cdr art))))
;; Go through all the new articles and add them, and their
;; time-stamps to the list.
(let ((n new))
(while n
(setq articles
(cons (cons
(car n)
(nth 5 (file-attributes
(concat dir (int-to-string (car n))))))
articles))
(setq n (cdr n))))
;; Make Gnus mark all new articles as unread.
(or (zerop (length new))
(gnus-make-articles-unread
(gnus-group-prefixed-name group (list 'nnmh ""))
(setq new (sort new '<))))
;; Sort the article list with highest numbers first.
(setq articles (sort articles (lambda (art1 art2)
(> (car art1) (car art2)))))
;; Finally write this list back to the .nnmh-articles file.
(save-excursion
(set-buffer (get-buffer-create "*nnmh out*"))
(insert ";; Gnus article active file for " group "\n\n")
(insert "(setq nnmh-newsgroup-articles '")
(insert (prin1-to-string articles) ")\n")
(write-region (point-min) (point-max) nnmh-file nil 'nomesg)
(kill-buffer (current-buffer)))))
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(defun nnmh-deletable-article-p (group article)
"Say whether ARTICLE in GROUP can be deleted."
(let ((path (concat nnmh-current-directory (int-to-string article))))
(and (file-writable-p path)
(or (not nnmail-keep-last-article)
(not (eq (cdr (nth 1 (assoc group nnmh-group-alist)))
article))))))
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(provide 'nnmh)
;;; nnmh.el ends here