Re: Braces with TabStaff

[Carl Sorensen]

 

 

From: lilypond-user <lilypond-user-bounces+carl.d.sorensen=gmail.com@gnu.org> on behalf of Jean Abou Samra <jean@abou-samra.fr>
Date: Friday, February 12, 2021 at 8:19 AM
To: David Kastrup <dak@gnu.org>, Richard Shann <richard@rshann.plus.com>
Cc: lilypond-user Mailinglist <lilypond-user@gnu.org>
Subject: Re: Braces with TabStaff

 

Hi,

Still, the output from this doesn't look expected:

\version "2.23.1" music = { c''1 } \new StaffGroup <<   \new TabStaff \music   \new Staff \music >> \new ChoirStaff <<   \new TabStaff \music   \new Staff \music >>

Doing some debugging:

\version "2.23.1" \layout { \context { \Score % Force showing all system start delimiters \override SystemStartBracket.collapse-height = -1 \override SystemStartBrace.collapse-height = -1 \override SystemStartBar.collapse-height = -1 \override SystemStartSquare.collapse-height = -1 % Some messages for debugging \consists #(lambda (context) (make-engraver (acknowledgers ((system-start-delimiter-interface engraver grob source-engraver) (ly:message "Found ~s from ~s" grob (ly:context-name (ly:translator-context source-engraver))))))) } } music = { c''1 } \new StaffGroup << \new TabStaff \music \new Staff \music >> \new ChoirStaff << \new TabStaff \music \new Staff \music >> \new ChoirStaff \with { systemStartDelimiterHierarchy = #'(SystemStartSquare) } << \new Staff \music \new TabStaff \music \new Staff \music >> \new ChoirStaff \with { \accepts TabStaff } << \new Staff \music \new TabStaff \music \new Staff \music >>

This yields:

Interpreting music...

Found #<Grob SystemStartBracket > from StaffGroup

Found #<Grob SystemStartBar > from Score

Preprocessing graphical objects...

Interpreting music...

Found #<Grob SystemStartBracket > from StaffGroup

Found #<Grob SystemStartBracket > from ChoirStaff

Found #<Grob SystemStartBar > from Score

Preprocessing graphical objects...

Interpreting music...

Found #<Grob SystemStartSquare > from StaffGroup

Found #<Grob SystemStartSquare > from ChoirStaff

Found #<Grob SystemStartBar > from Score

Preprocessing graphical objects...

Interpreting music...

Found #<Grob SystemStartBracket > from ChoirStaff

Found #<Grob SystemStartBar > from Score

Preprocessing graphical objects...

It looks like ly/engraver-init.ly is missing
\accepts "TabStaff" in the definition of ChoirStaff.
This causes an intermediate StaffGroup containing
just one TabStaff to be created as a layer between
ChoirStaff and TabStaff to fullfill acceptance
requirements.


If you agree, I'll make a quick patch.

 

It seems to me like a ChoirStaff is a special kind of StaffGroup that is not intended to have tablature associated with it.

 

Wouldn’t the better approach be to have the user create a new custom StaffGroup?

 

One of the strengths of LilyPond is keeping appropriate semantics in the input files.  I don’t think ChoirStaff is the appropriate semantics for a StaffGroup containing a traditional music staff and a tablature staff.

 

Thanks,

 

Carl

 

Cheers,
Jean