--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lisp/gnus/nnheaderems.el	Mon Aug 13 08:47:35 2007 +0200
@@ -0,0 +1,201 @@
+;;; nnheaderems.el --- making Gnus backends work under different Emacsen
+;; Copyright (C) 1996 Free Software Foundation, Inc.
+
+;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
+;; Keywords: news
+
+;; 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
+;; 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.
+
+;;; Commentary:
+
+;;; Code:
+
+(defun nnheader-xmas-run-at-time (time repeat function &rest args)
+  (start-itimer
+   "nnheader-run-at-time"
+   `(lambda ()
+      (,function ,@args))
+   time repeat))
+
+(defun nnheader-xmas-cancel-timer (timer)
+  (delete-itimer timer))
+
+;; Written by Erik Naggum <erik@naggum.no>.
+;; Saved by Steve Baur <steve@miranova.com>.
+(defun nnheader-xmas-insert-file-contents-literally (filename &optional visit beg end replace)
+  "Like `insert-file-contents', q.v., but only reads in the file.
+A buffer may be modified in several ways after reading into the buffer due
+to advanced Emacs features, such as file-name-handlers, format decoding,
+find-file-hooks, etc.
+  This function ensures that none of these modifications will take place."
+  (let (                                ; (file-name-handler-alist nil)
+        (format-alist nil)
+        (after-insert-file-functions nil)
+        (find-buffer-file-type-function 
+         (if (fboundp 'find-buffer-file-type)
+             (symbol-function 'find-buffer-file-type)
+           nil)))
+    (unwind-protect
+        (progn
+          (fset 'find-buffer-file-type (lambda (filename) t))
+          (insert-file-contents filename visit beg end replace))
+      (if find-buffer-file-type-function
+          (fset 'find-buffer-file-type find-buffer-file-type-function)
+        (fmakunbound 'find-buffer-file-type)))))
+
+(defun nnheader-xmas-find-file-noselect (filename &optional nowarn rawfile)
+  "Read file FILENAME into a buffer and return the buffer.
+If a buffer exists visiting FILENAME, return that one, but
+verify that the file has not changed since visited or saved.
+The buffer is not selected, just returned to the caller."
+  (setq filename
+	(abbreviate-file-name
+	 (expand-file-name filename)))
+  (if (file-directory-p filename)
+      (if find-file-run-dired
+	  (dired-noselect filename)
+	(error "%s is a directory." filename))
+    (let* ((buf (get-file-buffer filename))
+	   (truename (abbreviate-file-name (file-truename filename)))
+	   (number (nthcdr 10 (file-attributes truename)))
+	   ;; Find any buffer for a file which has same truename.
+	   (other (and (not buf) 
+		       (if (fboundp 'find-buffer-visiting)
+			   (find-buffer-visiting filename)
+			 (get-file-buffer filename))))
+	   error)
+      ;; Let user know if there is a buffer with the same truename.
+      (if other
+	  (progn
+	    (or nowarn
+		(string-equal filename (buffer-file-name other))
+		(message "%s and %s are the same file"
+			 filename (buffer-file-name other)))
+	    ;; Optionally also find that buffer.
+	    (if (or (and (boundp 'find-file-existing-other-name)
+			 find-file-existing-other-name)
+		    find-file-visit-truename)
+		(setq buf other))))
+      (if buf
+	  (or nowarn
+	      (verify-visited-file-modtime buf)
+	      (cond ((not (file-exists-p filename))
+		     (error "File %s no longer exists!" filename))
+		    ((yes-or-no-p
+		      (if (string= (file-name-nondirectory filename)
+				   (buffer-name buf))
+			  (format
+			   (if (buffer-modified-p buf)
+			       "File %s changed on disk.  Discard your edits? "
+			     "File %s changed on disk.  Reread from disk? ")
+			   (file-name-nondirectory filename))
+			(format
+			 (if (buffer-modified-p buf)
+			     "File %s changed on disk.  Discard your edits in %s? "
+			   "File %s changed on disk.  Reread from disk into %s? ")
+			 (file-name-nondirectory filename)
+			 (buffer-name buf))))
+		     (save-excursion
+		       (set-buffer buf)
+		       (revert-buffer t t)))))
+	(save-excursion
+;;; The truename stuff makes this obsolete.
+;;;	  (let* ((link-name (car (file-attributes filename)))
+;;;		 (linked-buf (and (stringp link-name)
+;;;				  (get-file-buffer link-name))))
+;;;	    (if (bufferp linked-buf)
+;;;		(message "Symbolic link to file in buffer %s"
+;;;			 (buffer-name linked-buf))))
+	  (setq buf (create-file-buffer filename))
+	  ;;	  (set-buffer-major-mode buf)
+	  (set-buffer buf)
+	  (erase-buffer)
+	  (if rawfile
+	      (condition-case ()
+		  (nnheader-insert-file-contents-literally filename t)
+		(file-error
+		 ;; Unconditionally set error
+		 (setq error t)))
+	    (condition-case ()
+		(insert-file-contents filename t)
+	      (file-error
+	       ;; Run find-file-not-found-hooks until one returns non-nil.
+	       (or t			; (run-hook-with-args-until-success 'find-file-not-found-hooks)
+		   ;; If they fail too, set error.
+		   (setq error t)))))
+	  ;; Find the file's truename, and maybe use that as visited name.
+	  (setq buffer-file-truename truename)
+	  (setq buffer-file-number number)
+	  ;; On VMS, we may want to remember which directory in a search list
+	  ;; the file was found in.
+	  (and (eq system-type 'vax-vms)
+	       (let (logical)
+		 (if (string-match ":" (file-name-directory filename))
+		     (setq logical (substring (file-name-directory filename)
+					      0 (match-beginning 0))))
+		 (not (member logical find-file-not-true-dirname-list)))
+	       (setq buffer-file-name buffer-file-truename))
+	  (if find-file-visit-truename
+	      (setq buffer-file-name
+		    (setq filename
+			  (expand-file-name buffer-file-truename))))
+	  ;; Set buffer's default directory to that of the file.
+	  (setq default-directory (file-name-directory filename))
+	  ;; Turn off backup files for certain file names.  Since
+	  ;; this is a permanent local, the major mode won't eliminate it.
+	  (and (not (funcall backup-enable-predicate buffer-file-name))
+	       (progn
+		 (make-local-variable 'backup-inhibited)
+		 (setq backup-inhibited t)))
+	  (if rawfile
+	      nil
+	    (after-find-file error (not nowarn)))))
+      buf)))
+
+(defun nnheader-ms-strip-cr ()
+  "Strip ^M from the end of all lines."
+  (save-excursion
+    (goto-char (point-min))
+    (while (re-search-forward "\r$" nil t)
+      (delete-backward-char 1))))
+
+(eval-and-compile
+  (cond 
+   ;; Do XEmacs function bindings.
+   ((string-match "XEmacs\\|Lucid" emacs-version)
+    (fset 'nnheader-run-at-time 'nnheader-xmas-run-at-time)
+    (fset 'nnheader-cancel-timer 'nnheader-xmas-cancel-timer)
+    (fset 'nnheader-find-file-noselect 'nnheader-xmas-find-file-noselect)
+    (fset 'nnheader-insert-file-contents-literally
+	  (if (fboundp 'insert-file-contents-literally)
+	      'insert-file-contents-literally
+	    'nnheader-xmas-insert-file-contents-literally)))
+   ;; Do Emacs function bindings.
+   (t
+    (fset 'nnheader-run-at-time 'run-at-time)
+    (fset 'nnheader-cancel-timer 'cancel-timer)
+    (fset 'nnheader-find-file-noselect 'find-file-noselect)
+    (fset 'nnheader-insert-file-contents-literally
+	  'insert-file-contents-literally)
+    ))
+  (when (memq system-type '(windows-nt))
+    (add-hook 'nnmail-prepare-incoming-hook 'nnheader-ms-strip-cr)))
+
+(provide 'nnheaderems)
+
+;;; nnheaderems.el ends here.