Determining if any messages where tagged in a macro?

[William Reardon <wdr1@xxxxxxxxx>]

When defining a macro, is there anyway to apply an action only if some 
messages where tagged?  The problem I'm running into is that my macro 
executes it's 'do stuff' part even when there are no messages tagged, 
resulting in it acting on the current message.  (Which isn't really what I 
want.)

E.g.,  if you have something like:

macro index .f "T~f foo@xxxxxxx\n;s=foo\n$"

It works if you have messages from foo, but if you don't, it will move the 
current message (which isn't from foo).

Any suggestions or tips?  Have other folks run into this?

[ My apologies if this is documented somewhere and I've missed it.  I tried 
searching the mutt-users archives, mutt.org & google groups without much 
luck. ]

Thanks,
-Bill