David Kastrup <d...@gnu.org> writes:
> Kai Lautenschläger <kai.lautenschlae...@me.com> writes:
>
>>> Am 22.09.2012 um 12:42 schrieb:
>>>
>>>> At some point of time, we probably should have a convenience function
>>>> for the pattern
>>>>
>>>> (reverse! (fold-some-music [predicate]
>>>> (lambda (l m) (cons ([extractor] m) l))
>>>> '()
>>>> [music]))
>>>>
>>>> The example code I posted uses this twice already.
>>
>>
>> Thanks for explaining. As for your idea [above] I would like that
>> feature very much, though I do not understand the code because I am
>> illiterate to programming languages.
>
> It turns out that the ([extractor] m) pattern can be equally well done
> separately using map!, so actually every function needed here is already
> available, making this somewhat simpler:
And actually, one does not need to nest the #{ #} constructs here, so
the following will do fine:
\language "deutsch"
rhythm = { s8.[ s16] }
melody = \relative c { a d g f e b}
applyRhythm =
#(define-music-function (parser location rhythm melody)
(ly:music? ly:music?)
#{ $@(append-map
cons
(map!
(lambda (m) (ly:music-property m 'pitch))
(extract-music melody
(lambda (m) (ly:music-property m 'pitch #f))))
(apply circular-list
(map!
(lambda (m) (cons (ly:music-property m 'duration)
(ly:music-property m 'articulations)))
(extract-typed-music rhythm 'skip-event))))
#})
\score {
\new Voice {
\relative c { g2 d8 h e4 f }
\applyRhythm \rhythm \melody
\relative c { g2 d8 h e4 f }
}
\layout { }
}
--
David Kastrup
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