Re: defineBarLine confusion

[David Zelinsky]

David Zelinsky <dzpost@dedekind.net> writes:

> I'm trying to understand how to use defineBarLine, based on the
> documentation in Notation Reference 1.2.5, and bar-line.scm.  The
> meaning of the "bartype" argument seems to not be exactly explained
> anywhere, but from what is said (mostly in bar-line.scm), and a lot of
> experimentation, I deduce that all the characters before a possible "-"
> are taken to be names of existing barline glyph elements, and the new
> barline glyph is the concatenation of those.
>
> Moreover, from the documentation, the second argument is a list of 3
> things that define the behavior at a line break or for spanning multiple
> staves.  So I expected these to have no effect when the barline is
> occuring in the middle of a single staff.
>
> However, I'm seeing some different behavior:
>
> \version "2.24.0"
> \relative c'' {
>   \defineBarLine ":;|!-a" #'(#t #t #t)
>   \defineBarLine ":;|!-b" #'(#t #t #f)
>   \defineBarLine ":;|!-c" #'(#t #t "||")
>   a1 \bar ":;|!-a"
>   b1 \bar ":;|!-b"
>   c1 \bar ":;|!-c"
>   d1
> }
>
>
>
>
> Since this is a single staff, I expected all these to appear the same.
> But version "b" only uses the first character of the bartype argument.
> I don't see this documented anywhere, and can't imagine a use-case.
>
> Is it a bug?
>
>
> -David



After delving into the code in bar-line.scm, I see why this is
happening, and I'm convinced it *is* a bug, and I can describe what I
think is a reasonable fix.  How should I best go about conveying this to
the developers?

-David