David Kastrup wrote
> Looks fine.  \colorizeDir is not actually being used as a tweak here,
> but then that makes pretty little sense anyway.

Ok, I've added it here:
http://lsr.dsi.unimi.it/LSR/Item?id=889

Since it requires 2.17 I had to comment out the whole thing, and add a
single note to get the LSR to accept it.  

I also split colorizeDir up into two parts, as shown below.  This seemed
easier to understand and avoids (re-)defining grob-colorize-dir for every
grob that gets colored.  Let me know if that's not a good call.

HTH,
-Paul


#(define (grob-colorize-dir grob)
   (let ((ev (event-cause grob)))
     (case (and ev (ly:event-property ev 'direction))
       ((1) red)
       ((-1) blue)
       (else '()))))

colorizeDir =
#(define-music-function (parser location item)
   (symbol-list-or-music?)
   #{ \tweak color #grob-colorize-dir #item #})



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