Re: Define custom/new \accidentalStyles (dodecaphonic minus repeated notes)

[David Nalesnik]

Hi Urs,

On Mon, Feb 3, 2014 at 3:16 AM, Urs Liska <address@hidden> wrote:

Hi,

searching the docs and the lilypond-user archive I couldn't find any relevant information.

I am looking for a custom \accidentalStyle. Actually I think this is quite commonly used, so it would also seem like a useful addition to LilyPond proper.

a)
Every note gets an explicit accidental (including a natural),
as in the 'dodecaphonic style,
_except_ when a note is repeated immediately in the same voice.

I've seen it too, and I think it would be good to include it.

 

When looking into music-functions.scm and its set-accidental-style I see

 ((equal? style 'dodecaphonic)
  (set-accidentals-properties #f
                              `(Staff ,(lambda (c p bn mp) '(#f . #t)))
                              '()
                              context))


So it seems the way to go to make a copy of that definition (e.g. with comparing against 'dodecaphonic-no-repeat) and modifying the definition.

Yes.  That's what I do in the attached file.

 

Unfortunately I don't have a clue how to proceed. Any trials are simply anwered by errors, so I'd prefer not to _try_ but to do at least _informed guesses_ ;-)

I assume that the
    `(Staff
_expression_ returns the
    context pitch barnumber measureposition
arguments for
    set-accidental-properties
so this seems the place to define the right arguments.

Unfortunately I haven't _fully_ understood lambda expressions and _barely_ understood quoting and unquoting.

So I'd be glad about hints/explanations/solutions to

a)
create a differing but valid argument list at all and
b)
determining which '(#f . #t) combinations to use for my purpose.

I confess that I find what goes on in the source a bit confusing, but I did come up with something that appears to work.  I make no claims about having done this the right way :)

First of all, I looked at clauses other than that for dodecaphonic for inspiration, since that one is only good for hit-it-with-a-hammer situations, and you need some refinement here. You definitely want the initial #f which prevents old-style cancellations--the extra natural when flat follows double-flat, but you need some variability in your setting of the cdr--that is, auto-accidentals.

I used neo-modern as a starting point, and wrote a 'dodecaphonic-no-repeat-rule'.

I had to copy other functions from scm/music-functions.scm since they're not define-public.

The file includes the demonstration example from the NR.

--David

accidental-style.ly
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