lisp/autoinsert.el: Change default of auto-insert-alist.

* lisp/autoinsert.el (auto-insert-alist): Update C/C++ header and
program support to match more extensions.  Replace non-alnum
characters when generating include guards (headers) and check for more
extensions when generating includes (programs)
(bug#19254).

lisp/ChangeLog

+2014-12-04  Rupert Swarbrick  <ruperts@broadcom.com> (tiny change)
+	    Rüdiger Sonderfeld  <ruediger@c-plusplus.net>
+
+	* autoinsert.el (auto-insert-alist): Update C/C++ header and
+	program support to match more extensions.  Replace non-alnum
+	characters when generating include guards (headers) and check for
+	more extensions when generating includes (programs)
+	(bug#19254).
+
 2014-12-03  Eric S. Raymond  <esr@snark.thyrsus.com>
 
 	* files.el (file-tree-walk): Fix docstring.

lisp/autoinsert.el

@@ -91,23 +91,24 @@ If this contains a %s, that will be replaced by the matching rule."
 
 
 (defcustom auto-insert-alist
-  '((("\\.\\([Hh]\\|hh\\|hpp\\)\\'" . "C / C++ header")
-     (upcase (concat (file-name-nondirectory
-		      (file-name-sans-extension buffer-file-name))
-		     "_"
-		     (file-name-extension buffer-file-name)))
+  '((("\\.\\([Hh]\\|hh\\|hpp\\|hxx\\|h\\+\\+\\)\\'" . "C / C++ header")
+     (replace-regexp-in-string
+      "[^A-Z0-9]" "_"
+      (replace-regexp-in-string
+       "\\+" "P"
+       (upcase (file-name-nondirectory buffer-file-name))))
      "#ifndef " str \n
      "#define " str "\n\n"
      _ "\n\n#endif")
 
-    (("\\.\\([Cc]\\|cc\\|cpp\\)\\'" . "C / C++ program")
+    (("\\.\\([Cc]\\|cc\\|cpp\\|cxx\\|c\\+\\+\\)\\'" . "C / C++ program")
      nil
      "#include \""
-     (let ((stem (file-name-sans-extension buffer-file-name)))
-       (cond ((file-exists-p (concat stem ".h"))
-	      (file-name-nondirectory (concat stem ".h")))
-	     ((file-exists-p (concat stem ".hh"))
-	      (file-name-nondirectory (concat stem ".hh")))))
+     (let ((stem (file-name-sans-extension buffer-file-name))
+           ret)
+       (dolist (ext '("H" "h" "hh" "hpp" "hxx" "h++") ret)
+         (when (file-exists-p (concat stem "." ext))
+           (setq ret (file-name-nondirectory (concat stem "." ext))))))
      & ?\" | -10)
 
     (("[Mm]akefile\\'" . "Makefile") . "makefile.inc")
@@ -305,6 +306,7 @@ file-name or one relative to `auto-insert-directory' or a function to call.
 ACTION may also be a vector containing several successive single actions as
 described above, e.g. [\"header.insert\" date-and-author-update]."
   :type 'sexp
+  :version "25.1"
   :group 'auto-insert)