(file-coding-system-alist): Fix custom type.

2 files changed, 24 insertions, 9 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index f6121660708..1505d43ee76 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,7 @@
+2007-07-08  Katsumi Yamaoka  <yamaoka@jpl.org>
+
+        * cus-start.el (file-coding-system-alist): Fix custom type.
+
 2007-07-08  Chong Yidong  <cyd@stupidchicken.com>
 
         * longlines.el (longlines-wrap-region): Avoid marking buffer as
diff --git a/lisp/cus-start.el b/lisp/cus-start.el
index 61f073119e7..38231f29a6c 100644
--- a/lisp/cus-start.el
+++ b/lisp/cus-start.el
@@ -116,15 +116,26 @@ Leaving \"Default\" unchecked is equivalent with specifying a default of
               mule
               (alist
                :key-type (regexp :tag "File regexp")
-               :value-type (choice
-                            :value (undecided . undecided)
-                            (cons :tag "Encoding/decoding pair"
-                                  :value (undecided . undecided)
-                                  (coding-system :tag "Decoding")
-                                  (coding-system :tag "Encoding"))
-                            (coding-system :tag "Single coding system"
-                                           :value undecided)
-                            (function :value ignore))))
+               :value-type
+               (choice
+                :value (undecided . undecided)
+                (cons :tag "Encoding/decoding pair"
+                      :value (undecided . undecided)
+                      (coding-system :tag "Decoding")
+                      (coding-system :tag "Encoding"))
+                (coding-system
+                 :tag "Single coding system"
+                 :value undecided
+                 :validate
+                 (lambda (widget)
+                   (unless (or (coding-system-p (widget-value widget))
+                               (functionp (widget-value widget)))
+                     (widget-put
+                      widget
+                      :error (format "Invalid coding system: %S"
+                                     (widget-value widget)))
+                     widget)))
+                (function :value ignore))))
              (selection-coding-system mule coding-system)
              ;; dired.c
              (completion-ignored-extensions dired