Re: Tenuto marking too close to note

[Jean Abou Samra]

Le 29/12/2021 à 09:45, Lukas-Fabian Moser a écrit :
> A cleaner and more surgical solution would be:
>
> \version "2.18"
>
> #(assoc-set! (assoc-ref default-script-alist "tenuto") 'padding 0.5)
>
> \new Staff {
>   \relative c'' {\time 3/4 a g e--}
> }
>
> Although this approach manipulates internal data structures of 
> LilyPond, it has the advantage of dealing with your issue at the root 
> and not causing side effects for other scripts. Unfortunately, this 
> approach does not work directly for the (still experimental) LilyPond 
> builds using Guile2.


Be mindful that assoc-set! is not guaranteed to
mutate its input. You're not the first one tripped
up by this API quirk :-)  See
https://www.gnu.org/software/guile/manual/html_node/Adding-or-Setting-Alist-Entries.html.
I'm occasionally using helpers like the following
to set values in nested alists:

\version "2.22.1" % also works in 2.18 and with Guile 2

#(use-modules (ice-9 match))
#(define (set-path path value alist)
   (let loop ((path path)
              (copy (copy-tree alist)))
       (match path
         (() value)
         ((p . rest)
          (assoc-set! copy p (loop rest (assoc-get p copy '())))))))

\layout {
  \context {
    \Score
    scriptDefinitions = #(set-path '("tenuto" padding) 0.5 
default-script-alist)
  }
}

{
  \relative c'' {\time 3/4 a g e--}
}

Regards,
Jean