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From: | Matthew Fong |
Subject: | Writing Scheme in Lilypond to control glyph used for custom custos function |
Date: | Sun, 7 Mar 2021 17:26:23 -0800 |
Hello everyone,
I'm writing a function that places a custos after the double bar to give singers an indication of the pitch of their next note. Usually, custos are are used within a piece, but in chant, I have verses that are part of new scores, and it is helpful to indicate the pitch of the first note.
I wanted to custos to be consistent with the intra-piece custos as I have set it up, that is,
1/ Notes on the ledger line up until b' use custodes.vaticana.u1 (long stem up)
2/ Notes in between the ledger up until b' use custodes.vaticana.u0 (short stem up)
3/ Notes on the ledger line from b' use ustodes.vaticana.d1 (long stem down)
4/ Notes in between the ledger from b' use custodes.vaticana.d0 (short stem down)
And this should work regardless of the key signature of the piece (since things might get transposed).
May I get some pointers of how the logic might be coded up?
Here is what I have so far, with help from this list, and taken from
https://lilypond.org/doc/v2.20/Documentation/notation/substitution-function-examples
addCustos =
#(define-music-function (noteList)
(ly:music?)
#{
\tweak NoteHead.stencil #ly:text-interface::print
\tweak NoteHead.font-size #3
\tweak NoteHead.text \markup {
\musicglyph "custodes.vaticana.u1"
}
\tweak Stem.stencil ##f
$(first (music-pitches noteList)) 4
#}
)
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