Hi,
I'm working on a music-function that takes one music argument,
determines the type of music and dispatches to a styling function that
will apply either a \tweak, a \once \override or that will wrap the
music in \temporary \override / \revert expressions.
I got pretty far in the determination of when to use which modification
type, and I arrived at using the \once \override appraoch for
non-rhythmic events like key signatures, clefs, time signatures etc.,
which so far seems to work pretty well.
However, now I want to add the functionality to auto-detect the grob to
override, and I thought checking for the 'types music-property. But
there arise a few questions:
#(define (infer-item music)
(let ((types (ly:music-property music 'types)))
(ly:message "Types: ~a" types)
(cond
((memq 'key-change-event types) '(Staff KeySignature))
((memq 'time-signature-music types) '(Staff TimeSignature))
((memq 'mark-event types) '(Score RehearsalMark))
((memq 'tempo-change-event types) '(Score MetronomeMark))
((memq 'music-wrapper-music types) '(Staff Clef)))))
1)
Determining Staff.Clef is obviously not correct since there are other
music-wrapper-music types around. How can I reliably determine if a
music expression (which has already been determined not to be sequential
and not to be rhythmic) consists of a \clef assignment?
2)
How can I know the comprehensive list of type/grob mappings I have to
support?
3)
What would be a better structure than the growing list of memq
conditionals, especially if the list should turn out to be significantly
longer than the five I currently have?
Thanks
Urs
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