From aa0214dae5260f7523fc6d0aa0ca94eb5f46e09b Mon Sep 17 00:00:00 2001
From: Dmitry Gutov <dgutov@yandex.ru>
Date: Sat, 5 Oct 2013 20:21:22 +0300
Subject: [PATCH] Revert 2013-10-05T02:26:39Z!dgutov@yandex.ru

`last-coding-system-used' is unreliable: it can be modified by other functions
in `after-save-hook'.
---
 lisp/ChangeLog              |  8 --------
 lisp/progmodes/ruby-mode.el | 28 ++++++++++++++++++----------
 2 files changed, 18 insertions(+), 18 deletions(-)

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 0b617f8ed0f..e3ca8751535 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -3,14 +3,6 @@
 	* progmodes/octave.el (octave-send-region): Call
 	compilation-forget-errors.
 
-2013-10-05  Dmitry Gutov  <dgutov@yandex.ru>
-
-	* progmodes/ruby-mode.el (ruby-mode): Add `ruby-mode-set-encoding'
-	to `after-save-hook' instead of `before-save-hook', because then
-	we know exactly what encoding was used to write the file.
-	(ruby-mode-set-encoding): Use `last-coding-system-used' instead of
-	guessing.  Call `basic-save-buffer-1' after modifying the buffer.
-
 2013-10-04  Xue Fuqiao  <xfq.free@gmail.com>
 
 	* vc/vc-svn.el (vc-svn-find-admin-dir):
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))
-- 
2.39.2