cd xmms-1.2.7/Input/vorbis
patch -p3 vorbis.c <xmms-vorbis-title.diff
mv vorbis.c vorbis.y
bison vorbis.y -o vorbis.c

Syntax:

%tagname%	inserts contents of given tag. TODO: support multiple tags
		with same name.

'string'	inserts literal string. TODO: allow escaped quotes.

$if(A,B,C)	if A doesn't contain any nonexistent tags, then display B
		else display C.

[A]		if A doesn't contain any nonexistent tags, then display A.
		(Like "$if(A,A,)".)

$num(A,B)	displays A formatted as a number padded with zeros up to a 
		width of B. (A is never truncated.)

$lower(A)	Converts A to lower case.

$upper(A)	Converts A to upper case.

$caps2(A)	Converts first letter of each word of A to upper case.
		"first letter" being defined as "not preceded by another
		 letter". TODO: fix "Don'T".

$caps(A)	As $caps, but converts all other letters to lower case.


Note that *all* strings must be in single quotes, even the second
parameter to $num.

Example:

[%artist%' - ']%title%[' ('%album%[' / '$num(%tracknumber%,'2')]')']

Produces results such as "Steely Dan - Josie (Alive in America / 05)".