in Snippets - LilyPond

Tweaks and overrides 454
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Using ly:grob-object to access grobs with \tweak
Some grobs can be accessed “laterally” from within another grob’s callback. These are usually
listed as “layout objects” in the “Internal properties” section of a grob-interface. The function
ly:grob-object is used to access these grobs.
Demonstrated below are some ways of accessing grobs from within a NoteHead callback,
but the technique is not limited to NoteHeads. However, the NoteHead callback is particularly
important, since it is the implicit callback used by the \tweak command.
The example function defined below ("display-grobs") is probably not that useful, but it
demonstrates that the grobs are indeed being accessed.
Example console output:
——————– #-Grob Accidental - #-Grob Arpeggio - #-Grob Stem -
#(define (notehead-get-accidental notehead)
;; notehead is grob
(ly:grob-object notehead 'accidental-grob))
#(define (notehead-get-arpeggio notehead)
;; notehead is grob
(let ((notecolumn (notehead-get-notecolumn notehead)))
(ly:grob-object notecolumn 'arpeggio)))
#(define (notehead-get-notecolumn notehead)
;; notehead is grob
(ly:grob-parent notehead X))
#(define (notehead-get-stem notehead)
;; notehead is grob
(let ((notecolumn (notehead-get-notecolumn notehead)))
(ly:grob-object notecolumn 'stem)))
#(define (display-grobs notehead)
;; notehead is grob
(let ((accidental (notehead-get-accidental notehead))
(arpeggio (notehead-get-arpeggio notehead))
(stem (notehead-get-stem notehead)))
(format (current-error-port) "~2&~a\n" (make-string 20 #\-))
(for-each
(lambda (x) (format (current-error-port) "~a\n" x))
(list accidental arpeggio stem))))
\relative c' {
%% display grobs for each note head:
%\override NoteHead #'before-line-breaking = #display-grobs