Re: Discern post-event in music function

[caagr98]

There's a `post-event?` predicate defined in 
scm/define-music-display-methods.scm. I don't think that one's easily 
accessible outside that module, but you can copy it:

(define (post-event? m)
  (music-is-of-type? m 'post-event))


On 04/20/17 16:59, Simon Albrecht wrote:
> Hello,
>
> I currently use this implementation of the \after function:
>
> after =
> #(define-music-function (t e m) (ly:duration? ly:music? ly:music?)
>     #{
>       \context Bottom <<
>         #m
>         { \skip $t <> -\tweak extra-spacing-width #empty-interval $e }
>       >>
>     #})
>
> Unfortunately, it doesn’t allow using it with e.g. \tempo expressions, 
> since it expects a post-event. So I need the music function to do 
> different things depending on whether the second argument is a 
> post-event or not.  How could one implement a ‘post-event?’ predicate?
>
> Best, Simon
>
>
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