Re: Capturing out-of-music markup for music braille

[Timothy Lanfear]

On 26/03/2024 14:01, Maurits Lamers via LilyPond user discussion wrote:

>       - is there a way to get a listener or callback of some kind to
>       capture out-of-music markup?
>       
>       - is there a way to get access to the global headers and / or
>       score headers (in case of score specific headers)?
>       
>       - is there documentation on how to get a reference to the required
>       parameters for these scheme functions?
>       
>       
>       
>

Here is an example for printing the global headers and score headers. You can also print the global headers from the initialize translator step of your engraver.

\version "2.24.0"

Header_export =
#(lambda (context)
  (make-engraver
    ((initialize translator)
      (ly:message "Print global headers with engraver\n")
      (printheader $defaultheader))))

#(define (headerfield header field)
  (if (and header (module-defined? header field))
    (ly:message "header field: ~a — value: ~a \n" field (module-ref header field))))

#(define (printheader header)
  (headerfield header 'opus)
  (headerfield header 'title)
  (headerfield header 'piece))

\layout { \context { \Score \consists \Header_export } }

\header {
  title = "Title"
  opus = "Op 1"
}

myscore = \score { \header { piece = "Piece" } { c'1 } }
\myscore

#(printheader $defaultheader)
#(printheader (ly:score-header myscore))

-- 
Timothy Lanfear, Bristol, UK.