2013/1/5 David Kastrup <d...@gnu.org>:
> Noeck <noeck.marb...@gmx.de> writes:
[...]
>> The words "layout props" and the "interpret-markup" are still cryptic
>> to me. Is there a documentation where this is described for noobs like
>> me?
>
> No. I don't think there is reasonable documentation where this is
> described for experts either. Consider it a magic incantation.
[...]
Hi Joram,
you could have a look at the top of /scm/define-markup-commands.
There you'll find some explanations.
Par example:
;;; layout and props
;;; arguments that are automatically passed to the command when it
;;; is interpreted.
;;; `layout' is an output def, which properties can be accessed
;;; using `ly:output-def-lookup'.
;;; `props' is a list of property settings which can be accessed
;;; using `chain-assoc-get' (more on that below)
;;;
`interpret-markup` turns the markup-argument into a stencil.
It's defined in /scm/markup.scm:
(define-public interpret-markup ly:text-interface::interpret-markup)
I defined a markup-command which displays the layout- and props-variable.
Well, it's not very useful for `layout´. You should look for examples
how it is used via `ly:output-def-lookup'
Displaying the `props' works nice and may be of some help.
#(define-markup-command (write-layout-props layout props arg)
(markup?)
(newline)(display "layout ")(write layout)
(newline)(display "props ")(write props)
(interpret-markup
layout
props
arg))
\markup \write-layout-props "X"
HTH,
Harm
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