Implement procedure `rename-auto-save-file!'. Implement command

`do-auto-save'.

diff --git a/v7/src/edwin/autosv.scm b/v7/src/edwin/autosv.scm
index 4772a4c7cea4effa5d4b1cbe4e23fb6be5812640..ff2e9b41257d36e6d0c4ccde0b24d975d0ed33d4 100644 (file)
--- a/v7/src/edwin/autosv.scm
+++ b/v7/src/edwin/autosv.scm
@@ -1,6 +1,6 @@
 ;;; -*-Scheme-*-
 ;;;
-;;;    $Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/edwin/autosv.scm,v 1.22 1991/03/16 00:01:10 cph Exp $
+;;;    $Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/edwin/autosv.scm,v 1.23 1991/04/12 23:13:55 cph Exp $
 ;;;
 ;;;    Copyright (c) 1986, 1989-91 Massachusetts Institute of Technology
 ;;;
@@ -80,11 +80,21 @@ With arg, turn auto-saving on if arg is positive, else off."
              (not (buffer-auto-save-pathname buffer)))
          (begin
            (enable-buffer-auto-save! buffer)
-           (temporary-message "Auto Save enabled"))
+           (message "Auto Save enabled"))
          (begin
            (disable-buffer-auto-save! buffer)
-           (temporary-message "Auto Save disabled"))))))
+           (message "Auto Save disabled"))))))
 
+(define-command do-auto-save
+  "Auto-save all buffers that need it.
+This is all buffers that have auto-saving enabled
+and are changed since last auto-saved.
+Auto-saving writes the buffer into a file
+so that your editing is not lost if the system crashes.
+This file is not the file you visited; that changes only when you save."
+  ()
+  (lambda () (do-auto-save)))
+\f
 (define (setup-buffer-auto-save! buffer)
   (if (ref-variable auto-save-default)
       (enable-buffer-auto-save! buffer)
@@ -101,6 +111,23 @@ With arg, turn auto-saving on if arg is positive, else off."
 (define (disable-buffer-auto-save! buffer)
   (set-buffer-auto-save-pathname! buffer false))
 
+(define (delete-auto-save-file! buffer)
+  (if (ref-variable delete-auto-save-files)
+      (let ((pathname (buffer-auto-save-pathname buffer)))
+       (if (and pathname (file-exists? pathname))
+           (delete-file pathname)))))
+
+(define (rename-auto-save-file! buffer)
+  (let ((old-pathname (buffer-auto-save-pathname buffer)))
+    (enable-buffer-auto-save! buffer)
+    (let ((new-pathname (buffer-auto-save-pathname buffer)))
+      (if (and old-pathname
+              new-pathname
+              (not (pathname=? new-pathname old-pathname))
+              (not (pathname=? new-pathname (buffer-pathname buffer)))
+              (file-exists? old-pathname))
+         (rename-file old-pathname new-pathname)))))
+
 (define (do-auto-save)
   (let ((buffers
         (list-transform-positive (buffer-list)
@@ -119,10 +146,4 @@ With arg, turn auto-saving on if arg is positive, else off."
   (region->file (buffer-unclipped-region buffer)
                (buffer-auto-save-pathname buffer))
   (set-buffer-save-length! buffer)
-  (set-buffer-auto-saved! buffer))
-
-(define (delete-auto-save-file! buffer)
-  (if (and (ref-variable delete-auto-save-files)
-          (buffer-auto-save-pathname buffer)
-          (file-exists? (buffer-auto-save-pathname buffer)))
-      (delete-file (buffer-auto-save-pathname buffer))))
\ No newline at end of file
+  (set-buffer-auto-saved! buffer))
\ No newline at end of file