Guitar chord formatting in Lout?

[Paul A Blampied]

I would like to write a Lout package for formatting songs with guitar chords.
Firstly, does such a package already exist?

It should take song lines such as:

@Chord{G}Knock, knock, @Chord{D}knocking on heaven's @Chord{C}door

and output the lyrics with the chord names above in the appropriate place:

G             D                    C
Knock, knock, knocking on heaven's door

My question is - is there an easy way to define @Chord in Lout, or is it
necessary to do some external preprocessing to get into the form:

{{G} ^//0.2f {Knock, knock, }}{{D} ^//0.2f {knocking on heaven's }} etc...


I have tried defining @Chord as:

def     @Chord
  left  chord
  right arg
{chord ^//0.2f arg}

but it has several problems, such as:

i) if it has no left argument;
ii) if the chord should appear above the middle of a word.

Any comments or suggestions would be gratefully received,

        Paul Blampied (address@hidden)