How do you get values from a context property? I'm trying to access
the left-bound text. I know I can do it like this:
(cdr (car (cdr (car (cdr (car (car (ly:context-property context
'TextSpanner)))))))))))
but that's kind-of ugly.
This code:
#(define (format-textspan engraver event)
(let* ((context (ly:translator-context engraver))
(moment (ly:context-current-moment context)))
(display "\n")
(display
(ly:context-property context 'TextSpanner)
)
))
produces the following (with linebreaks and indents added). I'm
really confused about the multiple "bound-details", the multiple
"left/right" inside each bound-details, etc. How can I make sure I
get the bound-details that I want, without using plain old (car ...) ?
(
(bound-details
(left (text . II) (stencil-align-dir-y . 0) (Y . 0) (padding .
0.25) (attach-dir . -1))
(right (text #<procedure line-markup (layout props args)>
((#<procedure draw-line-markup (layout props dest)> (0 . -1))))
(padding . -1) (Y . 0) (padding . 0.25))
(left (stencil-align-dir-y . 0) (Y . 0) (padding . 0.25) (attach-dir . -1))
(right (padding . -1) (Y . 0) (padding . 0.25))
(left (Y . 0) (padding . 0.25) (attach-dir . -1))
(left-broken (end-on-note . #t))
(right (Y . 0) (padding . 0.25))
)
(bound-details
(right (text #<procedure line-markup (layout props args)>
((#<procedure draw-line-markup (layout props dest)> (0 . -1))))
(padding . -1) (Y . 0) (padding . 0.25))
(left (stencil-align-dir-y . 0) (Y . 0) (padding . 0.25)
(attach-dir . -1)) (right (padding . -1) (Y . 0) (padding . 0.25))
(left (Y . 0) (padding . 0.25) (attach-dir . -1))
(left-broken (end-on-note . #t)) (right (Y . 0) (padding . 0.25))
)
(bound-details (left (stencil-align-dir-y . 0) (Y . 0) (padding .
0.25) (attach-dir . -1)) (right (padding . -1) (Y . 0) (padding .
0.25)) (left (Y . 0) (padding . 0.25) (attach-dir . -1)) (left-broken
(end-on-note . #t)) (right (Y . 0) (padding . 0.25)))
... and so on...
Cheers,
- Graham
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