Re: Catch direction operators

[David Kastrup]

David Kastrup <address@hidden> writes:

> colorizeDir =
> #(define-music-function (parser location item)
>   (symbol-list-or-music?)
>   (define (grob-colorize-dir grob)
>     (let ((ev (event-cause grob)))
>       (and ev (ly:event-property ev 'direction #f)
>               red)))
>   #{ \tweak color #grob-colorize-dir #item #})

Not everything might be prepared to deal with a color #f, so it may be
safer to write the slightly more complex

(if (and ev (ly:event-property ev 'direction #f))
    red '())

expression inside.

-- 
David Kastrup