Re: How to automate file-opening (derived filename)?

[Danny Dorfman]

Here is what I got from posting a question at http://www.experts-exchange.com
This actually does the trick! (from user "itonju01")

> This works for me.  You can rename it to whatever you want
> instead of open-x-header.
>
> Hopefully the backslashes aren't munged by the expert-exchange posting system.
>
> Enjoy.
>
>
> (defun open-x-header ()
>  (interactive)
>    (if 
>     ;; replace /a/ with /ZZZ/
>     (string-match "^\\(.*\\)/a/\\(.*\\)\\.c$" buffer-file-name)
>
>     ;; replace find-file-other-window with find-file 
>     ;; or find-file-other-frame if you wish
>     (find-file-other-window
>      (concat (match-string 1 buffer-file-name)
>           "/"
>           "b"  ;; replace with YYY
>           "/"
>           (match-string 2 buffer-file-name)
>           ".h"))
>     (message "No match.")))
>