Free Meter - increasing the barnumber wherever you want

If you do not want to use lilypond's automatic barlines but rather just insert barlines with \bar, the bar counter will not be increased, and therefore two problems may occur:

• accidentals will not be properly reset,
• and the printed barnumber will be wrong.

This snippet defines a function, \increaseBarNumber that - yeah - increases the barnumber, thereby making accidentals and typeset barnumbers behave correctly. Just call it whenever you insert a manual bar.
Also defines short hand functions \ibar and \nibar - as illustrated by the example.

\version "2.24.0"

%% http://lsr.di.unimi.it/LSR/Item?id=333

%% Updaters remark:
%% This snippet actually doubles the one in 2.24.-NR. "Unmetered music"
%% Thus it will be deleted soon.
%% For now replacing it with code from said NR-section.
%% Ofcourse, the description is now wrong/misleading --Harm

cadenzaMeasure = {
  \cadenzaOff
  \partial 1024 s1024
  \cadenzaOn
}

\score {
  \new Staff \with { \remove Time_signature_engraver } {
    \cadenzaOn
    \accidentalStyle modern-cautionary
    \key a \major
    \repeat unfold 2 {
      c'8 dis' eis'  eis'
      \cadenzaMeasure
      c'4 dis'  e' eis' \cadenzaMeasure \bar ";"
      c' dis' eis'8 dis' eis' \cadenzaMeasure
      c'1 dis' eis' eis'2 \cadenzaMeasure \bar "||"
    }
    \cadenzaOff
    b1
    \bar "|."
  }

  \layout {
    \context {
      \Score
      \override BarNumber.break-visibility = ##(#f #t #t)
    }
  }
}