How to customize the bar numbers?

[hyucheng3721]

How to display bar numbers at the beginning of each line instead of every 5 bars? Or do I decide how many bars to display the bar numbers?As shown below

[ssb22]

To display bar numbers every N bars where N is not 5, currently you can use an LP: block:

LP: \set Score.barNumberVisibility = #(every-nth-bar-number-visible 4)
:LP
1 2 3 4 5 4 3 2 1 2 3 4 5 4 3 2 1 2 3 4 5 4 3 2 1 2 3 4 5 4 3 2 1 - - -

There's a comment in jianpu-ly.py that's relevant to this:

bar_number_every = 5 # TODO customise?  (anyway don't leave it numbering at start of system, doesn't work well in jianpu+lyrics)

Unlike your example image, Lilypond's default bar numbers are not in boxes. Lilypond numbers bars at the start of the line by default, but I put in the command to change that because it didn't look very good when I tried it, especially when there were lyrics. It was too easy to confuse the bar numbers for something else. But we could ask Lilypond to put a box around each bar number (source) if you want to match that style:

LP: \override Score.BarNumber.stencil = #(make-stencil-boxer 0.1 0.25 ly:text-interface::print)
 :LP

[hyucheng3721]

Appreciate the reply, and thanks for the details.
I noticed that the bar numbers is not displayed at the beginning of each line, so if I want to displayed the bar numbers at the beginning of each line and not elsewhere, how can I do it?

[ssb22]

well this is how to do it but I didn't like how the result looks:

LP:
\override Score.BarNumber #'break-visibility = ##(#f #f #t)
\set Score.barNumberVisibility = #all-bar-numbers-visible
:LP
1 2 3 4 5 4 3 2 1 2 3 4 5 4 3 2 1 2 3 4 5 4 3 2 1 2 3 4 5 4 3 2
1 2 3 4 5 4 3 2 1 2 3 4 5 4 3 2 1 2 3 4 5 4 3 2 1 2 3 4 5 4 3 2 1 - - -

[hyucheng3721]

It labels the bar numbers before the bar, not the upper-left corner of the bar, which doesn't look ideal.