That is very helpful. Thank you. I will ping again if I have any further
questions.
Aug 31, 2023, 14:35 by l...@gmx.de:
> Hi Michael,
>
> over time, I found that doing something like this in an engraver (as opposed
> to a music function) is actually much easier and conceptually clear, in spite
> of the seeming difficulty of the engraver syntax. The advantage of using an
> engraver being that you see the "actual" pitches and don't have to fight with
> problems of \relative, \transpose and so on.
>
> \version "2.24.0"
>
> pitch-replace-dictionary =
> #(list
> (cons #{ c #} #{ cis #})
> (cons #{ d #} #{ des #})
> )
>
> #(define (pitch-class= p q)
> (and
> (= (ly:pitch-notename p) (ly:pitch-notename q))
> (= (ly:pitch-alteration p) (ly:pitch-alteration q))))
>
> Pitch_replace_engraver =
> #(lambda (context)
> (make-engraver
> (listeners
> ((note-event engraver event)
> (let*
> ((pitch (ly:event-property event 'pitch))
> (rule (assoc pitch pitch-replace-dictionary pitch-class=)))
>
> (if rule
> (ly:event-set-property!
> event 'pitch
> (ly:make-pitch (ly:pitch-octave pitch)
> (ly:pitch-notename (cdr rule))
> (ly:pitch-alteration (cdr rule))))))))))
>
> \layout {
> \context {
> \Score
> \consists #Pitch_replace_engraver
> }
> }
>
> \relative {
> c'4 d e c8 8
> \transpose f c \relative {
> f'4 g a
> }
> }
>
> This engraver can also be added to just a single score (\layout inside \score
> {}) or even a single Staff or Voice. At the moment, the replacement
> dictionary is global, but this could be changed if needed.
>
> At the moment the mechanism I chose is too crude to do replacements that
> involve changing the pitch-octave (eg from c to b,). Do you need this?
>
> Lukas
>
> Am 31.08.23 um 12:53 schrieb Michael Winter via LilyPond user discussion:
>
>> I would like to do something (hopefully simple), which is basically a custom
>> find and replace for a set of notes in an entire score.
>>
>> For example {c cis d dis fih g aih} -> {c cis dih dis f gis a}
>>
>> So basically on arbitrary list of pitches / scale to another.
>>
>> Is this possible without writing a custom function. If not, any hints on how
>> to tackle the problem would be much appreciated. Thanks in advance.
>>
>> -Michael
>>
