Re: issues with "afterGrace" since 2.20

[Jean Abou Samra]

Le 28/05/2022 à 03:19, Ahanu Banerjee a écrit :
> Hello,
>
> In lilypond 2.20.0, I was able to use "afterGrace" like this:
>
>     \version "2.20.0"
>     \language "english"
>     \relative c' { d2 \afterGrace 4 { cs16 d } }
>
> However, this now presents an error: "warning: \afterGrace exceeds 
> duration of main argument". Running ly-convert does not fix it.



What version did you upgrade to? For me, this throws a different
error in 2.22 and 2.23.9:


/tmp/frescobaldi-y8ru8zd4/tmppz87jisz/document.ly:4:44: error: syntax 
error, unexpected '}', expecting \header

\relative c' { d2 \afterGrace 4 { cs16 d }

}

/tmp/frescobaldi-y8ru8zd4/tmppz87jisz/document.ly:4:1: error: errors 
found, ignoring music expression


\relative c' { d2 \afterGrace 4 { cs16 d } }

fatal error: failed files: 
"/tmp/frescobaldi-y8ru8zd4/tmppz87jisz/document.ly"



> If I change "\aftergrace 4" to "\aftergrace d4", it works fine. 
> However, I have multiple documents written with the aforementioned 
> syntax, and it would take a long time to fix them manually. Any 
> suggestions?


My understanding is that this broke with this change in
the LilyPond sources:

commit 027538606b016afb643555d654cefaee94dfb424
Author: David Kastrup <dak@gnu.org>
Date:   Wed May 23 19:08:31 2018 +0200

    Issue 5327/4: Let \afterGrace and \scaleDurations take a scale

    That's more versatile than allowing just a fraction as a pair
    as previously.


The problem is that the naked '4' is now being taken as
an optional argument to \afterGrace, which is a customized
value for afterGraceFraction.

If you don't want to fix your files manually, you could
add a redefinition of \afterGrace that doesn't have
this optional argument, like this:


\version "2.22.2"

afterGrace = \afterGrace \afterGraceFraction \etc

\language "english"
\relative c' { d2 \afterGrace 4 { cs16 d } }


Best,
Jean