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Patch to utf-tool.el for >= emacs-23. Replace only CJK characters.
--- utf-tool.el.orig 2013-02-24 15:24:54.914062345 +0900
+++ utf-tool.el 2013-02-24 15:23:21.947814237 +0900
@@ -58,11 +58,13 @@
;; (charset-description charset)
;; (split (split-char char))
(pos (point))
- (unicode nil))
+ (unicode nil)
+ (cjk (string-match "CJK" (get-char-code-property char 'name))))
- (memq charset '(ascii japanese-jisx0208 katakana-jisx0201))
+ (or (memq charset '(ascii japanese-jisx0208 katakana-jisx0201))
+ (not cjk))
(if (or (< char 256)
- (memq 'mule-utf-8 (find-coding-systems-region pos (1+ pos)))
+ (memq 'utf-8 (find-coding-systems-region pos (1+ pos)))
(get-char-property pos 'untranslated-utf-8))
(setq unicode (or (get-char-property pos 'untranslated-utf-8)
(encode-char char 'ucs))))
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