Re: extracting markup texts for braille

[Aaron Hill]

On 2024-04-01 3:47 am, Maurits Lamers via Discussions on LilyPond 
development wrote:
> Hey all,
>
> I also asked this question on the lilypond-user mailing list, but I 
> gather it is a rather complex question for that list. As you might be 
> aware, I have been working on a braille extension for Lilypond which 
> (based on the music info extraction example) renders Lilypond scores 
> into music braille.
>
> While the listener system works great for extracting musical 
> information, it doesn't provide any methods to extract text inserted 
> outside of the music context.
>
> In my specific case, I am trying to convert a songbook, which has the 
> format of printing one verse of a song with the music notation, and 
> with the remainder of the song text as \markup text blocks below the 
> music.
>
> Is there any way that I could extract this text in order to include it 
> with the generated braille? The preferred solution should be as 
> transparent as the listener system is for the musical information.
>
> Thanks in advance!


Easiest option would probably be to tie into the 
`toplevel-text-handler`:

%%%%
\version "2.25.13"

#(let ((original-proc toplevel-text-handler))
  (set! toplevel-text-handler (lambda (markup)
    (format #t "~a\n" (markup->string markup))
    (original-proc markup))))

\markup \column {
  \line { \bold { Lorem ipsum } dolor sit amet, }
  \line { \italic consectetur adipiscing elit. }
}
%%%%


-- Aaron Hill