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357 lines
11 KiB
EmacsLisp
357 lines
11 KiB
EmacsLisp
;;; nneething.el --- random file 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>
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;; Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
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;; Keywords: news, mail
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; 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
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; Based on nnspool.el by Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>.
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;; For an overview of what the interface functions do, please see the
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;; Gnus sources.
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;;; Code:
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(require 'nnheader)
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(require 'nnmail)
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(require 'nnoo)
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(eval-when-compile (require 'cl))
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(nnoo-declare nneething)
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(defvoo nneething-map-file-directory "~/.nneething/"
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"*Where nneething stores the map files.")
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(defvoo nneething-map-file ".nneething"
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"*Name of the map files.")
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(defvoo nneething-exclude-files nil
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"*Regexp saying what files to exclude from the group.
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If this variable is nil, no files will be excluded.")
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;;; Internal variables.
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(defconst nneething-version "nneething 1.0"
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"nneething version.")
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(defvoo nneething-current-directory nil
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"Current news group directory.")
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(defvoo nneething-status-string "")
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(defvoo nneething-group-alist nil)
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(defvoo nneething-message-id-number 0)
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(defvoo nneething-work-buffer " *nneething work*")
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(defvoo nneething-directory nil)
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(defvoo nneething-group nil)
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(defvoo nneething-map nil)
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(defvoo nneething-read-only nil)
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(defvoo nneething-active nil)
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;;; Interface functions.
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(nnoo-define-basics nneething)
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(deffoo nneething-retrieve-headers (articles &optional group server fetch-old)
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(nneething-possibly-change-directory group)
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(save-excursion
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(set-buffer nntp-server-buffer)
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(erase-buffer)
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(let* ((number (length articles))
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(count 0)
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(large (and (numberp nnmail-large-newsgroup)
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(> number nnmail-large-newsgroup)))
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article file)
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(if (stringp (car articles))
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'headers
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(while (setq article (pop articles))
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(setq file (nneething-file-name article))
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(when (and (file-exists-p file)
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(or (file-directory-p file)
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(not (zerop (nnheader-file-size file)))))
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(insert (format "221 %d Article retrieved.\n" article))
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(nneething-insert-head file)
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(insert ".\n"))
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(incf count)
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(and large
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(zerop (% count 20))
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(message "nneething: Receiving headers... %d%%"
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(/ (* count 100) number))))
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(when large
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(message "nneething: Receiving headers...done"))
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(nnheader-fold-continuation-lines)
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'headers))))
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(deffoo nneething-request-article (id &optional group server buffer)
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(nneething-possibly-change-directory group)
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(let ((file (unless (stringp id) (nneething-file-name id)))
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(nntp-server-buffer (or buffer nntp-server-buffer)))
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(and (stringp file) ; We did not request by Message-ID.
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(file-exists-p file) ; The file exists.
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(not (file-directory-p file)) ; It's not a dir.
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(save-excursion
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(nnmail-find-file file) ; Insert the file in the nntp buf.
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(or (nnheader-article-p) ; Either it's a real article...
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(progn
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(goto-char (point-min))
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(nneething-make-head file (current-buffer)) ; ... or we fake some headers.
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(insert "\n")))
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t))))
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(deffoo nneething-request-group (group &optional dir dont-check)
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(nneething-possibly-change-directory group dir)
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(unless dont-check
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(nneething-create-mapping)
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(if (> (car nneething-active) (cdr nneething-active))
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(nnheader-insert "211 0 1 0 %s\n" group)
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(nnheader-insert
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"211 %d %d %d %s\n"
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(- (1+ (cdr nneething-active)) (car nneething-active))
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(car nneething-active) (cdr nneething-active)
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group)))
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t)
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(deffoo nneething-request-list (&optional server dir)
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(nnheader-report 'nneething "LIST is not implemented."))
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(deffoo nneething-request-newgroups (date &optional server)
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(nnheader-report 'nneething "NEWSGROUPS is not implemented."))
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(deffoo nneething-request-type (group &optional article)
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'unknown)
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(deffoo nneething-close-group (group &optional server)
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(setq nneething-current-directory nil)
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t)
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;;; Internal functions.
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(defun nneething-possibly-change-directory (group &optional dir)
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(when group
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(if (and nneething-group
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(string= group nneething-group))
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t
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(let (entry)
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(if (setq entry (assoc group nneething-group-alist))
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(progn
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(setq nneething-group group)
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(setq nneething-directory (nth 1 entry))
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(setq nneething-map (nth 2 entry))
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(setq nneething-active (nth 3 entry)))
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(setq nneething-group group)
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(setq nneething-directory dir)
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(setq nneething-map nil)
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(setq nneething-active (cons 1 0))
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(nneething-create-mapping)
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(push (list group dir nneething-map nneething-active)
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nneething-group-alist))))))
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(defun nneething-map-file ()
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;; We make sure that the .nneething directory exists.
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(unless (file-exists-p nneething-map-file-directory)
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(make-directory nneething-map-file-directory 'parents))
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;; We store it in a special directory under the user's home dir.
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(concat (file-name-as-directory nneething-map-file-directory)
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nneething-group nneething-map-file))
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(defun nneething-create-mapping ()
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;; Read nneething-active and nneething-map.
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(let ((map-file (nneething-map-file))
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(files (directory-files nneething-directory))
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touched map-files)
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(if (file-exists-p map-file)
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(condition-case nil
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(load map-file nil t t)
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(error nil)))
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(or nneething-active (setq nneething-active (cons 1 0)))
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;; Old nneething had a different map format.
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(when (and (cdar nneething-map)
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(atom (cdar nneething-map)))
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(setq nneething-map
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(mapcar (lambda (n)
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(list (cdr n) (car n)
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(nth 5 (file-attributes
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(nneething-file-name (car n))))))
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nneething-map)))
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;; Remove files matching the exclusion regexp.
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(when nneething-exclude-files
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(let ((f files)
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prev)
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(while f
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(if (string-match nneething-exclude-files (car f))
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(if prev (setcdr prev (cdr f))
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(setq files (cdr files)))
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(setq prev f))
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(setq f (cdr f)))))
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;; Remove deleted files from the map.
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(let ((map nneething-map)
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prev)
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(while map
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(if (and (member (cadar map) files)
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;; We also remove files that have changed mod times.
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(equal (nth 5 (file-attributes
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(nneething-file-name (cadar map))))
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(caddar map)))
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(progn
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(push (cadar map) map-files)
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(setq prev map))
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(setq touched t)
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(if prev
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(setcdr prev (cdr map))
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(setq nneething-map (cdr nneething-map))))
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(setq map (cdr map))))
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;; Find all new files and enter them into the map.
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(while files
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(unless (member (car files) map-files)
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;; This file is not in the map, so we enter it.
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(setq touched t)
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(setcdr nneething-active (1+ (cdr nneething-active)))
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(push (list (cdr nneething-active) (car files)
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(nth 5 (file-attributes
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(nneething-file-name (car files)))))
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nneething-map))
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(setq files (cdr files)))
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(when (and touched
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(not nneething-read-only))
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(save-excursion
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(nnheader-set-temp-buffer " *nneething map*")
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(insert "(setq nneething-map '" (prin1-to-string nneething-map) ")\n"
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"(setq nneething-active '" (prin1-to-string nneething-active)
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")\n")
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(write-region (point-min) (point-max) map-file nil 'nomesg)
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(kill-buffer (current-buffer))))))
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(defun nneething-insert-head (file)
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"Insert the head of FILE."
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(when (nneething-get-head file)
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(insert-buffer-substring nneething-work-buffer)
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(goto-char (point-max))))
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(defun nneething-make-head (file &optional buffer)
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"Create a head by looking at the file attributes of FILE."
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(let ((atts (file-attributes file)))
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(insert
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"Subject: " (file-name-nondirectory file) "\n"
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"Message-ID: <nneething-"
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(int-to-string (incf nneething-message-id-number))
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"@" (system-name) ">\n"
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(if (equal '(0 0) (nth 5 atts)) ""
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(concat "Date: " (current-time-string (nth 5 atts)) "\n"))
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(or (if buffer
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(save-excursion
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(set-buffer buffer)
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(if (re-search-forward "<[a-zA-Z0-9_]@[-a-zA-Z0-9_]>" 1000 t)
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(concat "From: " (match-string 0) "\n"))))
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(nneething-from-line (nth 2 atts) file))
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(if (> (string-to-int (int-to-string (nth 7 atts))) 0)
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(concat "Chars: " (int-to-string (nth 7 atts)) "\n")
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"")
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(if buffer
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(save-excursion
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(set-buffer buffer)
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(concat "Lines: " (int-to-string
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(count-lines (point-min) (point-max))) "\n"))
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"")
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)))
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(defun nneething-from-line (uid &optional file)
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"Return a From header based of UID."
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(let* ((login (condition-case nil
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(user-login-name uid)
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(error
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(cond ((= uid (user-uid)) (user-login-name))
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((zerop uid) "root")
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(t (int-to-string uid))))))
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(name (condition-case nil
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(user-full-name uid)
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(error
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(cond ((= uid (user-uid)) (user-full-name))
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((zerop uid) "Ms. Root")))))
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(host (if (string-match "\\`/[^/@]*@\\([^:/]+\\):" file)
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(prog1
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(substring file
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(match-beginning 1)
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(match-end 1))
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(if (string-match "/\\(users\\|home\\)/\\([^/]+\\)/" file)
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(setq login (substring file
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(match-beginning 2)
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(match-end 2))
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name nil)))
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(system-name))))
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(concat "From: " login "@" host
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(if name (concat " (" name ")") "") "\n")))
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(defun nneething-get-head (file)
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"Either find the head in FILE or make a head for FILE."
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(save-excursion
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(set-buffer (get-buffer-create nneething-work-buffer))
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(setq case-fold-search nil)
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(buffer-disable-undo (current-buffer))
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(erase-buffer)
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(cond
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((not (file-exists-p file))
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;; The file do not exist.
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nil)
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((or (file-directory-p file)
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(file-symlink-p file))
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;; It's a dir, so we fudge a head.
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(nneething-make-head file) t)
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(t
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;; We examine the file.
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(nnheader-insert-head file)
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(if (nnheader-article-p)
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(delete-region
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(progn
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(goto-char (point-min))
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(or (and (search-forward "\n\n" nil t)
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(1- (point)))
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(point-max)))
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(point-max))
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(goto-char (point-min))
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(nneething-make-head file (current-buffer))
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(delete-region (point) (point-max)))
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t))))
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(defun nneething-file-name (article)
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"Return the file name of ARTICLE."
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(concat (file-name-as-directory nneething-directory)
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(if (numberp article)
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(cadr (assq article nneething-map))
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article)))
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(provide 'nneething)
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;;; nneething.el ends here
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