Re: opus migration

[Jean Abou Samra]

Le 09/11/2021 à 19:41, Mark Stephen Mrotek a écrit :
> Hello,
>
> .
>
> A piano piece I am engraving has several sections. Each has different 
> meters, keys, and number of voices. Each is coded in a separate score 
> for ease of future editing.
>
> The entire piece is structured
>
> \header {
>
> title = ‘’title’’
>
> composer = ‘’composer’’
>
> opus = ‘’opus’’
>
> }
>
> \include “section1.ly’’
>
> \include ‘’section2.ly’’
>
> \include ‘’section3ly’’
>
> \include ‘’section4.ly’’            Yes the quote marks are not the 
> correct style here.
>
> When compiled the opus appears before each section.
>
> Reading
>
> https://lilypond.org/doc/v2.22/Documentation/notation/creating-titles-headers-and-footers
>
> “Note, though, that only piece and opus fields are printed by default 
> in Score Titles unless the \paper variable, print-all-headers, is set 
> to #t.”
>
> Would someone please provide a functioning explanation has to how this 
> apply this to my current piece?
>
> Thank you for your kind attention..
>
> Mark


Mark,

Let me take an example illustrating your problem:

\version "2.22.1"

\header {
  title = "title"
  composer = "composer"
  opus = "opus"
}

{ c'1 }

{ c'1 }

The documentation is consistent here. opus is meant as a per-score 
field. The intended usage is something like

\version "2.22.1"

\header {
  title = "title"
  composer = "composer"
}

\score {
  \header {
    opus = "opus 1"
  }
  { c'1 }
}

\score {
  \header {
    opus = "opus 2"
  }
  { c'1 }
}

When you put it in a top-level \header block, all scores inherit the 
field. print-all-headers makes scores inherit more fields, and you want 
the exact opposite.

You could turn opus off in all scores but the first.

\version "2.22.1"

\header {
  title = "title"
  composer = "composer"
}

\score {
  \header {
    opus = "opus 1"
  }
  { c'1 }
}

\score {
  \header {
    opus = ##f
  }
  { c'1 }
}

Or, likely simplest, you could use another header field intended for 
usage in book-level titles.

\version "2.22.1"

\header {
  title = "title"
  composer = "composer"
  arranger = "opus"
}

{ c'1 }

{ c'1 }


Best regards,
Jean