Re: Predicting accidentals

[Leo Correia de Verdier]

This looks like it’s working, but doesn’t give the expected results (the second 
c-sharp is shown as having an accidental while the following c is shown 
without).

Can you find any misstakes in it (either writing misstakes or how its thought)?

\version "2.19.82"

printAcc = #(define-music-function (note) (ly:music?)
              (let* ((pitch (ly:music-property note 'pitch))
                     (autoacc 0)
                     (staff-context 0))
                #{
                  \context Staff \applyContext
                  #(lambda (context)
                     (begin
                      (set! autoacc (cadr (ly:context-property context 
'autoAccidentals)))
                      (set! staff-context context)))
                  \context Timing  \applyContext
                  #(lambda (timing-context)
                     (let* ((barnum (ly:context-property timing-context 
'currentBarNumber))
                            (measurepos (ly:context-property timing-context 
'measurePosition)))
                       (pretty-print (autoacc staff-context pitch barnum 
measurepos))))
                  #note
                #}
                ))

\fixed c' {
  \printAcc cis4
  \printAcc cis
  \printAcc c
}


> 7 maj 2019 kl. 12:13 skrev Leo Correia de Verdier <address@hidden>:
> 
> Dear list!
> 
> Is there a way to run the functions in autoAccidental before they would 
> normally be evaluated, to see beforehand if a note would get an accidental?
> 
> What I would like iso do is a function that in some cases (depending on other 
> circumstances in code) forces an accidental with a tweak, but only on notes 
> that doesn’t already have one.
> 
> Thanks a lot for your help! Your’e doing a great work!