Re: display-scheme-music not working inside markup-command-definition?

[David Kastrup]

Thomas Morley <address@hidden> writes:

> Hi,
>
> exploring chordnaming further, I thought it might be nice, if a
> formating procedures for ChordNames could be used in a markup-command
> outputting equal designed chord-names.
>
> Though, looks like I have a problem:
>
> #(display-scheme-music #{ \chordmode { c:m } #})
> works ofcourse.
>
> But for
>
> #(define-markup-command (foo parser location)()
>   (display-scheme-music #{ \chordmode { c:m } #})
>   (interpret-markup parser location "xy"))
>
> \markup \foo
>
> I get this:
>
> Preprocessing graphical
> objects.../home/harm/lilypond-git/build/out/share/lilypond/current/scm/parser-ly-from-scheme.scm:70:21:
> In procedure ly:parser-clone in expression (ly:parser-clone parser
> closures ...):
> /home/harm/lilypond-git/build/out/share/lilypond/current/scm/parser-ly-from-scheme.scm:70:21:
> Wrong type argument in position 1 (expecting Lily_parser): #<
> Output_def>
>
> I've not a real clue what's wrong and how to fix/proceed.
>
> Any hint?

#{ #} expects a usable "parser" and "location" variable to be in scope.

However, inside of a definition

> #(define-markup-command (foo parser location)()

"parser" would be a layout definition, and "location" would be a
property list of alists.  I strongly suggest not tampering with the
usual "layout props" variable names here.  Even though _those_ are not
magic, the names "parser" and "location" are when encountering #{...#}.

The parser (and thus the notename language) will be the one active in
the file containing the define-markup-command as long as you don't mess
with them.  location will likely be #f, making point-and-click point to
the #{...#} construct itself.

-- 
David Kastrup