Re: Bar numbers on lines beginning with a partial measure

[Aaron Hill]

On 2022-02-06 1:37 am, Jean Abou Samra wrote:
> Are you aware of the options to print a parenthesized bar number at
> the start of the line if it's the continuation of a measure? See
> input/regression/bar-number-visibility-* (sadly missing documentation
> at the moment). I don't have an opinion on whether that is better
> practice or not than what you suggest. It is, at any rate, what Gould
> recommends (Behind Bars p. 490).

Thanks, Jean.  first-bar-number-invisible-save-broken-bars is one of the 
undocumented options that seems almost perfect.

At first glance, though, the parenthesized numbers stand out too much.  
Thankfully, the parenthesization logic is within 
robust-bar-number-function, which is easily adaptable as Scheme code.  
Some quick testing with the \parenthesize markup command looks better 
than relying on the glyphs of the number font which are a little too 
wide.

;;;;
;; ...preamble from robust-bar-number-function...
  (let*
   ((number-and-power (get-number-and-power 0 0))
    (begin-measure (= 0 (ly:moment-main-numerator measure-pos)))
    (text (string-append (number->string barnum)
           (make-letter "" (car number-and-power) (cdr 
number-and-power)))))
  (if begin-measure text
   (markup #:override '(line-thickness . 0.05)
           #:override '(padding . 0.05)
           #:override '(width . 0.2)
           #:parenthesize #:smaller text))))
;;;;

I will have to try this for awhile to see if I like it better than 
labelling the first full measure.  It is interesting that all bar 
numbers would be consistently aligned on the left margin, so that might 
prove useful.


-- Aaron Hill