emacs windmove and focus

Hello,

I have been using ratpoison for a little over a year.  Over the summer I 
discovered emacs windmove package.  I finally got around to making 
emacs's windmove to work with my keybindings for ratpoison's focus 
commands.  I had to modify the windmove-do-window-select function in 
windmove.el.  It would be nice if windmove's response to hitting the 
edge of the frame could be determined by a user defined function.

Anyway, for my fix, windmove wrapping has to be disabled.  If 
windmove-{dir}  would result in an error due to there not being a window 
in the direction dir,  then a call is made to ratpoison's focus{dir} 
command.  I setup keyboard shorcuts for ratpoison's focus{dir} that call 
windmove-{dir} if the current frame is emacs and otherwise call focus{dir}.

I modified the following function in windmove.el

#+begin_src emacs-lisp
   ;; Selects the window that's hopefully at the location returned by
   ;; `windmove-other-window-loc', or screams if there's no window there.
   (defun windmove-do-window-select (dir &optional arg window)
     "Move to the window at direction DIR.
   DIR, ARG, and WINDOW are handled as by `windmove-other-window-loc'.
   If no window is at direction DIR, an error is signaled."
     (let ((other-window (windmove-find-other-window dir arg window)))
       (cond ((null other-window)
;Added code
              (call-process-shell-command (concat "ratpoison -c " 
(combine-and-quote-strings (list (concat "focus" (format "%s" dir)))) 
"&") nil 0 )
              (message "focus%s" dir)
;End added code
              (error "No window %s from selected window" dir))
             ((and (window-minibuffer-p other-window)
                   (not (minibuffer-window-active-p other-window)))
              (error "Minibuffer is inactive"))
             (t
              (select-window other-window)))))

Modifications to ratpoisonrc.
        - definekey top s-h     exec result=`ratpoison -c "info %a"` ;if 
[ "$result" == "emacs" ]; then   emacsclient -e "(windmove-left)" ; else 
ratpoison -c "focusleft";fi; exit 0
        - definekey top s-j     exec result=`ratpoison -c "info %a"` ;if 
[ "$result" == "emacs" ]; then   emacsclient -e "(windmove-down)" ; else 
ratpoison -c "focusdown";fi; exit 0
        - definekey top s-k     exec result=`ratpoison -c "info %a"` ;if 
[ "$result" == "emacs" ]; then   emacsclient -e "(windmove-up)" ; else 
ratpoison -c "focusup";fi; exit 0
        - definekey top s-l     exec result=`ratpoison -c "info %a"` ;if 
[ "$result" == "emacs" ]; then   emacsclient -e "(windmove-right)" ; 
else ratpoison -c "focusright";fi; exit 0