Re: markup to string function?

[Jan-Peter Voigt]

Hello Reinhold,

I'm a bit in a hurry, so this is not finished but an idea:

I thought of my fine conversation about extracting lyrics with Jakob 
Lund a few days ago. I understand that markups are also lists and the 
strings are somewhere in this tree-list-structure.

This doesn't get you the desired result, but perhaps you can finish this.
--snip--
\version "2.12.3"

#(define (markup->string m)
        (let ((res ""))
             (map (lambda (x)
                          (display "> ")(display x)(display "\n")
                          (if (list? x)(set! res (string-append res 
(markup->string x))))
                          (if (string? x)(set! res (string-append res x)))
                          (display "! ")(display res)(display "\n")
                          res)
                  m) res))

ttt = \markup {
  \normal-text hallo \bold { welt }
}

#(display (markup->string ttt))

\header {
  title = \ttt
}
\relative c' {
  c
}
--snip--
With this bunch of displays, you see what is in the markup. There is a 
string concatenated, but it will leave all blanks so this "hallo welt" 
will get "hallowelt".
Just inserting blanks doesn't care about concats ...

Best regards,
Jan-Peter


On 26.01.2011 16:32, Reinhold Kainhofer wrote:
> I'm currently implementing PDF metadata (DOCINFO extracted from the \header
> fields) as well as PDF hyperlinks to given labels in the score. For both I
> would need to extract a pure-string representation of a given markup. E.g.,
> the title header field might be a markup:
>
> \header{
>    title = \markup { \italic "Title of " \bold \concat {"the" " " "piece"} }
> }
>
> Now, given that markup, I need a function that extracts only the text (in this
> case "Title of the piece"). Is there anything like that already available in
> lilypond?
>
> If not, do you have any idea about the easiest way to implement this? It's
> safe to ignore all graphical markup functions, but there are so many text
> markup functions that I can not easily handle each of them manually...
>
> Any ideas?
>
> Thanks,
> Reinhold