1 files changed, 18 insertions, 10 deletions

diff --git a/lisp/progmodes/ruby-mode.el b/lisp/progmodes/ruby-mode.el
index 8abf8fedefb..95206c15390 100644
--- a/lisp/progmodes/ruby-mode.el
+++ b/lisp/progmodes/ruby-mode.el
@@ -450,13 +450,19 @@ Also ignores spaces after parenthesis when 'space."
     (when (re-search-forward "[^\0-\177]" nil t)
       (goto-char (point-min))
       (let ((coding-system
-             (or (coding-system-get last-coding-system-used 'mime-charset)
-                 (coding-system-change-eol-conversion ast-coding-system-used
-                                                      nil))))
+             (or coding-system-for-write
+                 buffer-file-coding-system)))
+        (if coding-system
+            (setq coding-system
+                  (or (coding-system-get coding-system 'mime-charset)
+                      (coding-system-change-eol-conversion coding-system nil))))
         (setq coding-system
-              (symbol-name (or (and ruby-use-encoding-map
-                                    (cdr (assq coding-system ruby-encoding-map)))
-                               coding-system)))
+              (if coding-system
+                  (symbol-name
+                   (or (and ruby-use-encoding-map
+                            (cdr (assq coding-system ruby-encoding-map)))
+                       coding-system))
+                "ascii-8bit"))
         (if (looking-at "^#!") (beginning-of-line 2))
         (cond ((looking-at "\\s *#.*-\*-\\s *\\(en\\)?coding\\s *:\\s *\\([-a-z0-9_]*\\)\\s *\\(;\\|-\*-\\)")
                (unless (string= (match-string 2) coding-system)
@@ -470,9 +476,7 @@ Also ignores spaces after parenthesis when 'space."
                  (insert coding-system)))
               ((looking-at "\\s *#.*coding\\s *[:=]"))
               (t (when ruby-insert-encoding-magic-comment
-                   (insert "# -*- coding: " coding-system " -*-\n"))))
-        (when (buffer-modified-p)
-          (basic-save-buffer-1))))))
+                   (insert "# -*- coding: " coding-system " -*-\n"))))))))
 
 (defun ruby-current-indentation ()
   "Return the indentation level of current line."
@@ -1930,7 +1934,11 @@ The variable `ruby-indent-level' controls the amount of indentation.
   (set (make-local-variable 'end-of-defun-function)
        'ruby-end-of-defun)
 
-  (add-hook 'after-save-hook 'ruby-mode-set-encoding nil 'local)
+  (add-hook
+   (cond ((boundp 'before-save-hook) 'before-save-hook)
+         ((boundp 'write-contents-functions) 'write-contents-functions)
+         ((boundp 'write-contents-hooks) 'write-contents-hooks))
+   'ruby-mode-set-encoding nil 'local)
 
   (set (make-local-variable 'electric-indent-chars)
        (append '(?\{ ?\}) electric-indent-chars))