Rake pathmap

Hello,

i just try do dive deeper into rake and i’m watching Avdi G.'s
RubyTabas episode about rake pathmap.

there’re nice things as
%p whole path
%f file name without directory
%n file base name only
%d directory only

etc.

the thing is: it’s explained in the video but i can’t find this stuff in
any documentation.

Any suggestions where i can find this (and more advanced rake stuff)
explained?

Thanks & best regards,
Torsten