Include \markup in define-music-function

Question

I want a custom \breathe sign that can be freely positioned, like:

I have some shortcut code for this:

place = #(define-music-function (parser location xy)
          (pair?)
          #{
            \once \override TextScript.extra-offset = #xy
          #})

comma = \markup \musicglyph "comma"

used as \place #'(2 . 0) a2-\comma. However, it would be much nicer to be able to just write a2-\comma #'(2 . 0). Is there a way to accomplish this?

Answer 1

The following works here:

comma = #(define-event-function (parser location xy)
          (pair?)
          #{
            \tweak extra-offset #xy ^ \markup \musicglyph "comma"
          #})


{ a2\comma #'(2 . 0) }