Re: Setting subdivide beams in a more straightforward manner

[Jason Yip]

On 2024-12-14 17:51, Jason Yip - sripedia_getpgrp(a)slmail.me wrote:
> On 2024-12-14 16:14, tran li - litran39(a)hotmail.com wrote:
> > However, to manually (I mean, here, not to use LilyPond's auto-beaming 
> > functionality for subdivide beams, because even till now I still 
> > cannot be clear how subdivide beams in auto-beaming works and trying 
> > relevant commands often cannot bring me to the desired result) create 
> > subdivide beams, in the example above, you must say `\rb` and `\lb` 
> > before and after the last note of each subgroup, respectively. This is 
> > not quite convenient and not straightforward, because it isn't quite 
> > intuitive for code readers to identify that it refers to subdivision. 
> > my desired effect is just using one command like `\sdb` (abbreviation 
> > for subdivide beam), and transform the above code into:
> >
> >
> > example = {
> >    \relative c' { c16[ d e f \sdb g f e d \sdb c d e f \sdb g f e d] }
> > }
> >
> > So, is it possible?
> [...]
>
> I don't know if a manual command that does what you want is even 
> possible, especially if no number is provided (assuming in the latest 
> development version). You could maybe define `\sdb` to take 2 arguments 
> (the 2nd being the note itself) as a trick, though this is not my area 
> of expertise.

Try this (assuming if you are still ok with providing the subdivision 
depth):

sdb = #(define-music-function
  (n m)
  (integer? ly:music?)
  #{ \set stemRightBeamCount = #n
     #m
     \set stemLeftBeamCount = #n
  #})

example = {
  \relative c' { c16 [d e \sdb1 f g f e \sdb1 d c d e \sdb1 f g f e d] }
}