Naming a Function
-----------------

   The user can dynamically change the bindings of keys while using
Readline.  This is done by representing the function with a descriptive
name.  The user is able to type the descriptive name when referring to
the function.  Thus, in an init file, one might find

     Meta-Rubout:	backward-kill-word

   This binds the keystroke <Meta-Rubout> to the function
*descriptively* named `backward-kill-word'.  You, as the programmer,
should bind the functions you write to descriptive names as well.
Readline provides a function for doing that:

 - Function: int rl_add_defun (char *name, Function *function, int key)
     Add NAME to the list of named functions.  Make FUNCTION be the
     function that gets called.  If KEY is not -1, then bind it to
     FUNCTION using `rl_bind_key ()'.

   Using this function alone is sufficient for most applications.  It is
the recommended way to add a few functions to the default functions that
Readline has built in.  If you need to do something other than adding a
function to Readline, you may need to use the underlying functions
described below.