Re: Patch: Follow convention for reading with the minibuffer.

[Richard M. Stallman]

    I guess the current format of the default buffer prompt was easier
    to implement.  Finding an appropriate place in the given prompt to
    insert the default value is not a trivial task to do in C.

This suggests a simple solution: define a convention whereby the
prompt string for use with `b' and `B' specifies where to insert the
default.  The convention could be "use %s", and the insertion would be
done with `format'.  This is an incompatible change, in principle, but
I think no real uses will ever break.

If there is no %s in the prompt, it can add the default at the end,
just as it does now.

Does anyone see a problem with this simple solution?