Re: Basic Scheme Markdown Function

[Mark Knoop]

At 14:40 on 06 Dec 2024, Steph Phillips wrote:
> Hi all, this one's probably a simple solution, but I'm a
> little fuzzy on how to implement custom Scheme functions
> still.

> I'm working on a musical theater score, and there are lots
> of instrument changes formatted like this:

> changeBbClar = ^\markup {
>     \general-align #X #-0.7
>     \bold
>     \override #'(box-padding . 0.5) \box
>     "Bb Clarinet"
> }

> My end goal is a function where I can define the name of
> the instrument and the x-alignment - something like

> \InstrumentChange "Bb Clarinet" #-0.7

This will do what you want.

InstrumentChange =
#(define-music-function
  (mkp align) (markup? number?)
  #{
  <>^\markup
  \general-align #X #align
  \bold
  \override #'(box-padding . 0.5)
  \box #mkp
  #})

For more details about writing music functions, see this excellent guide put 
together by Jean:

https://extending-lilypond.gitlab.io/en/extending/index.html

--
Mark Knoop