Re: Bar line at beginning of piece

[Lukas-Fabian Moser]

Hi Jean,

> Hm.
>
>
> \version "2.23.81"
>
> {
>   \once \set Timing.measureStartNow = ##t
>   \once \set Timing.measureBarType = "|-s"
>   c'1
>   \break
>   c'1
> }

Thank you very much - this works from 2.23.8 on, I assume because of 
Dan's additions. Great!

I still have to read up on the bar type definition codes which I never 
actually managed to understand. For example, in scm/bar-line.scm, I read:

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; predefined bar lines
;;
;; definition of bar lines goes as follows:
;;
;; (define-bar-line "mid-line bar[-annotation]"
;;                  "end-of-line bar[-annotation]"
;;                  "beginning-of-line bar[-annotation]"
;;                  "span bar")
;;
;; Each argument must be a string or #f.  The string "" calls for a
;; zero-width stencil.  The string "x" or the value #f call for no
;; stencil.  "x" may be annotated, unlike #f.

From this explanation, it find it hard to understand the the "mid-line" 
bar is taken as kind of an "identifier", which becomes clear only after 
reading

(define-public (define-bar-line bar-glyph eol-glyph bol-glyph span-glyph)
  "Define a bar glyph @var{bar-glyph} and its substitutes at the end of
a line (@var{eol-glyph}), at the beginning of a line (@var{bol-glyph})
and as a span bar (@var{span-glyph}).  The substitute glyphs may be
either strings or booleans: @code{#t} calls for the same value as
@var{bar-glyph} and @code{#f} calls for no glyph."

Also, "each argument must be a string or #f" seems strange when reading

(define-bar-line "|" #t #f #t)

So probably the comments on predefined bar lines don't reflect very 
faithfully what's actually happening?

Lukas