Make `make-auto-save-file-name' a magic operation.

etc/ChangeLog

+2005-08-31  Michael Albinus  <michael.albinus@gmx.de>
+
+	* NEWS: Add entry for `make-auto-save-file-name'.
+
 2005-08-19  Emilio C. Lopes  <eclig@gmx.net>
 
 	* emacsclient.1 (DESCRIPTION): Reflect inclusion in the

etc/NEWS

@@ -3908,6 +3908,10 @@ operations.
 This is useful for autoloaded handlers, to prevent them from being
 autoloaded when not really necessary.
 
++++
+*** The function `make-auto-save-file-name' is now handled by file
+name handlers.  This will be exploited for remote files mainly.
+
 ** Input changes:
 
 +++

lisp/ChangeLog

+2005-08-31  Michael Albinus  <michael.albinus@gmx.de>
+
+	* files.el (make-auto-save-file-name): Add file name handler call
+	if applicable.
+
+	* net/tramp.el (tramp-file-name-handler-alist)
+	(tramp-file-name-for-operation): Add `make-auto-save-file-name'.
+	(tramp-handle-make-auto-save-file-name): Renamed from
+	`tramp-make-auto-save-file-name'.
+	(tramp-exists-file-name-handler): New defun.
+	(tramp-advice-make-auto-save-file-name): Make defadvice only when
+	`make-auto-save-file-name' is not a magic file name operation.
+
 2005-08-30  Carsten Dominik  <dominik@science.uva.nl>
 
 	* textmodes/org.el (org-special-keyword): New face.

lisp/files.el

@@ -4062,53 +4062,57 @@ Does not consider `auto-save-visited-file-name' as that variable is checked
 before calling this function.  You can redefine this for customization.
 See also `auto-save-file-name-p'."
   (if buffer-file-name
-      (let ((list auto-save-file-name-transforms)
-	    (filename buffer-file-name)
-	    result uniq)
-	;; Apply user-specified translations
-	;; to the file name.
-	(while (and list (not result))
-	  (if (string-match (car (car list)) filename)
-	      (setq result (replace-match (cadr (car list)) t nil
-					  filename)
-		    uniq (car (cddr (car list)))))
-	  (setq list (cdr list)))
-	(if result
-	    (if uniq
-		(setq filename (concat
-				(file-name-directory result)
-				(subst-char-in-string
-				 ?/ ?!
-				 (replace-regexp-in-string "!" "!!"
-							   filename))))
-	      (setq filename result)))
-	(setq result
-	      (if (and (eq system-type 'ms-dos)
-		       (not (msdos-long-file-names)))
-		  ;; We truncate the file name to DOS 8+3 limits
-		  ;; before doing anything else, because the regexp
-		  ;; passed to string-match below cannot handle
-		  ;; extensions longer than 3 characters, multiple
-		  ;; dots, and other atrocities.
-		  (let ((fn (dos-8+3-filename
-			     (file-name-nondirectory buffer-file-name))))
-		    (string-match
-		     "\\`\\([^.]+\\)\\(\\.\\(..?\\)?.?\\|\\)\\'"
-		     fn)
-		    (concat (file-name-directory buffer-file-name)
-			    "#" (match-string 1 fn)
-			    "." (match-string 3 fn) "#"))
-		(concat (file-name-directory filename)
-			"#"
-			(file-name-nondirectory filename)
-			"#")))
-	;; Make sure auto-save file names don't contain characters
-	;; invalid for the underlying filesystem.
-	(if (and (memq system-type '(ms-dos windows-nt))
-		 ;; Don't modify remote (ange-ftp) filenames
-		 (not (string-match "^/\\w+@[-A-Za-z0-9._]+:" result)))
-	    (convert-standard-filename result)
-	  result))
+      (let ((handler (find-file-name-handler buffer-file-name
+					     'make-auto-save-file-name)))
+	(if handler
+	    (funcall handler 'make-auto-save-file-name)
+	  (let ((list auto-save-file-name-transforms)
+		(filename buffer-file-name)
+		result uniq)
+	    ;; Apply user-specified translations
+	    ;; to the file name.
+	    (while (and list (not result))
+	      (if (string-match (car (car list)) filename)
+		  (setq result (replace-match (cadr (car list)) t nil
+					      filename)
+			uniq (car (cddr (car list)))))
+	      (setq list (cdr list)))
+	    (if result
+		(if uniq
+		    (setq filename (concat
+				    (file-name-directory result)
+				    (subst-char-in-string
+				     ?/ ?!
+				     (replace-regexp-in-string "!" "!!"
+							       filename))))
+		  (setq filename result)))
+	    (setq result
+		  (if (and (eq system-type 'ms-dos)
+			   (not (msdos-long-file-names)))
+		      ;; We truncate the file name to DOS 8+3 limits
+		      ;; before doing anything else, because the regexp
+		      ;; passed to string-match below cannot handle
+		      ;; extensions longer than 3 characters, multiple
+		      ;; dots, and other atrocities.
+		      (let ((fn (dos-8+3-filename
+				 (file-name-nondirectory buffer-file-name))))
+			(string-match
+			 "\\`\\([^.]+\\)\\(\\.\\(..?\\)?.?\\|\\)\\'"
+			 fn)
+			(concat (file-name-directory buffer-file-name)
+				"#" (match-string 1 fn)
+				"." (match-string 3 fn) "#"))
+		    (concat (file-name-directory filename)
+			    "#"
+			    (file-name-nondirectory filename)
+			    "#")))
+	    ;; Make sure auto-save file names don't contain characters
+	    ;; invalid for the underlying filesystem.
+	    (if (and (memq system-type '(ms-dos windows-nt))
+		     ;; Don't modify remote (ange-ftp) filenames
+		     (not (string-match "^/\\w+@[-A-Za-z0-9._]+:" result)))
+		(convert-standard-filename result)
+	      result))))
 
     ;; Deal with buffers that don't have any associated files.  (Mail
     ;; mode tends to create a good number of these.)

lisp/net/tramp.el

@@ -1856,6 +1856,7 @@ on the FILENAME argument, even if VISIT was a string.")
     (insert-file-contents . tramp-handle-insert-file-contents)
     (write-region . tramp-handle-write-region)
     (find-backup-file-name . tramp-handle-find-backup-file-name)
+    (make-auto-save-file-name . tramp-handle-make-auto-save-file-name)
     (unhandled-file-name-directory . tramp-handle-unhandled-file-name-directory)
     (dired-compress-file . tramp-handle-dired-compress-file)
     (dired-call-process . tramp-handle-dired-call-process)
@@ -1863,7 +1864,7 @@ on the FILENAME argument, even if VISIT was a string.")
      . tramp-handle-dired-recursive-delete-directory)
     (set-visited-file-modtime . tramp-handle-set-visited-file-modtime)
     (verify-visited-file-modtime . tramp-handle-verify-visited-file-modtime))
-        "Alist of handler functions.
+  "Alist of handler functions.
 Operations not mentioned here will be handled by the normal Emacs functions.")
 
 ;; Handlers for partial tramp file names. For GNU Emacs just
@@ -3807,6 +3808,34 @@ This will break if COMMAND prints a newline, followed by the value of
 
       (tramp-run-real-handler 'find-backup-file-name (list filename)))))
 
+(defun tramp-handle-make-auto-save-file-name ()
+  "Like `make-auto-save-file-name' for tramp files.
+Returns a file name in `tramp-auto-save-directory' for autosaving this file."
+  (when tramp-auto-save-directory
+    (unless (file-exists-p tramp-auto-save-directory)
+      (make-directory tramp-auto-save-directory t)))
+  ;; jka-compr doesn't like auto-saving, so by appending "~" to the
+  ;; file name we make sure that jka-compr isn't used for the
+  ;; auto-save file.
+  (let ((buffer-file-name
+	 (if tramp-auto-save-directory
+	     (expand-file-name
+	      (tramp-subst-strs-in-string
+	       '(("_" . "|")
+		 ("/" . "_a")
+		 (":" . "_b")
+		 ("|" . "__")
+		 ("[" . "_l")
+		 ("]" . "_r"))
+	       (buffer-file-name))
+	      tramp-auto-save-directory)
+	   (buffer-file-name)))
+	;; We set it to nil because `make-auto-save-file-name' shouldn't
+	;; recurse infinitely.
+	tramp-auto-save-directory)
+      (tramp-run-real-handler
+       'make-auto-save-file-name)))
+
 
 ;; CCC grok APPEND, LOCKNAME, CONFIRM
 (defun tramp-handle-write-region
@@ -4086,8 +4115,9 @@ ARGS are the arguments OPERATION has been called with."
     (nth 2 args))
    ; BUF
    ((member operation
-	    (list 'set-visited-file-modtime 'verify-visited-file-modtime
-	          ; XEmacs only
+	    (list 'make-auto-save-file-name
+	          'set-visited-file-modtime 'verify-visited-file-modtime
+		  ; XEmacs only
 		  'backup-buffer))
     (buffer-file-name
      (if (bufferp (nth 0 args)) (nth 0 args) (current-buffer))))
@@ -6905,33 +6935,17 @@ as default."
 
 ;; Auto saving to a special directory.
 
-(defun tramp-make-auto-save-file-name (fn)
-  "Returns a file name in `tramp-auto-save-directory' for autosaving this file."
-  (when tramp-auto-save-directory
-    (unless (file-exists-p tramp-auto-save-directory)
-      (make-directory tramp-auto-save-directory t)))
-  ;; jka-compr doesn't like auto-saving, so by appending "~" to the
-  ;; file name we make sure that jka-compr isn't used for the
-  ;; auto-save file.
-  (let ((buffer-file-name (expand-file-name
-			   (tramp-subst-strs-in-string '(("_" . "|")
-							 ("/" . "_a")
-							 (":" . "_b")
-							 ("|" . "__")
-							 ("[" . "_l")
-							 ("]" . "_r"))
-						       fn)
-			   tramp-auto-save-directory)))
-    (make-auto-save-file-name)))
-
-(defadvice make-auto-save-file-name
-  (around tramp-advice-make-auto-save-file-name () activate)
-  "Invoke `tramp-make-auto-save-file-name' for tramp files."
-  (if (and (buffer-file-name) (tramp-tramp-file-p (buffer-file-name))
-	   tramp-auto-save-directory)
-      (setq ad-return-value
-            (tramp-make-auto-save-file-name (buffer-file-name)))
-    ad-do-it))
+(defun tramp-exists-file-name-handler (operation)
+  (let ((file-name-handler-alist (list (cons "/" 'identity))))
+    (eq (find-file-name-handler "/" operation) 'identity)))
+
+(unless (tramp-exists-file-name-handler 'make-auto-save-file-name)
+  (defadvice make-auto-save-file-name
+    (around tramp-advice-make-auto-save-file-name () activate)
+    "Invoke `tramp-handle-make-auto-save-file-name' for tramp files."
+    (if (and (buffer-file-name) (tramp-tramp-file-p (buffer-file-name)))
+	(setq ad-return-value (tramp-make-auto-save-file-name))
+      ad-do-it)))
 
 ;; In Emacs < 22 and XEmacs < 21.5 autosaved remote files have
 ;; permission 0666 minus umask. This is a security threat.

lispref/ChangeLog

+2005-08-31  Michael Albinus  <michael.albinus@gmx.de>
+
+	* files.texi (Magic File Names): Add `make-auto-save-file-name'.
+
 2005-08-29  Richard M. Stallman  <rms@gnu.org>
 
 	* elisp.texi (Top): Update subnode menu.
@@ -20,7 +24,7 @@
 
 	* display.texi (Finding Overlays): Fix `find-overlay-prop' in
 	`next-overlay-change' example.
-  
+
 2005-08-22  Juri Linkov  <juri@jurta.org>
 
 	* display.texi (Attribute Functions): Add set-face-inverse-video-p.
@@ -65,7 +69,7 @@
 	(Frame Parameters): Refer to Geometry.
 
 	* buffers.texi (The Buffer List): Fix xrefs.
-	
+
 	* windows.texi (Splitting Windows): Fix xref.
 
 	* frames.texi (Layout Parameters): Add xref.

lispref/files.texi

@@ -2580,7 +2580,9 @@ Here are the operations that a magic file name handler gets to handle:
 @code{get-file-buffer},
 @code{insert-directory},
 @code{insert-file-contents},@*
-@code{load}, @code{make-directory},
+@code{load},
+@code{make-auto-save-file-name},
+@code{make-directory},
 @code{make-directory-internal},
 @code{make-symbolic-link},@*
 @code{rename-file}, @code{set-file-modes}, @code{set-file-times},