Is this the sort of thing you're looking for?
```
#(define (dump-system-info sys)
(let* ((right (ly:spanner-bound sys RIGHT))
(time (ly:grob-property right 'when 0)))
(format #t "\nline break at ~f" (ly:moment-main time))))
\layout {
\context {
\Score
\override System.after-line-breaking = #dump-system-info
}
}
```
It should work on LilyPond 2.23.7 or later (current stable is 2.24). This:
> ```
> \layout {
> \context {
> \Staff
> \override System.after-line-breaking = #printPage
> }
> }
> ```
>
> should work. And it doesn't. I tried \Score context,
probably means you're running an older version.
Listening to page-break-event in an engraver is not what you're looking for —
these are only emitted for explicit `\break` commands.
Another way would be
```
#(define (dump-col-info col)
(when (eqv? LEFT (ly:item-break-dir col))
(let ((time (ly:grob-property col 'when 0)))
(format #t "\nline break at ~f" (ly:moment-main time)))))
\layout {
\context {
\Score
\override NonMusicalPaperColumn.after-line-breaking = #dump-col-info
}
}
```
which prints the time of all NonMusicalPaperColumn grobs that are just before a
line break. Note the difference between a PaperColumn, which is on a vertical
alignment of notes, and a NonMusicalPaperColumn, which is between two
PaperColumns (or at one extreme end of the system). There is a diagram
[here](https://extending-lilypond.gitlab.io/en/extending/backend.html#how-line-breaking-clones-grobs)
about `ly:item-break-dir`.
Both of these methods will print at each line break, but since you have just
one system per page, that's equivalent to printing page breaks in your case.
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