Re: Summary of actual page count and stave count on each page?

On 14/06/2026 17:30, Eric Benson wrote:
> Is there any way to get LilyPond to report some actual data about how 
> many pages it has produced and how many staves are on each page?

You can get intercept the list of pages in the paper block and retrieve 
information by writing a customised page-breaking function. The default 
algorithm for page breaking is ly:optimal-breaking, but you can pass in 
other algorithms 
(https://lilypond.org/doc/v2.26/Documentation/notation/page-breaking).

\version "2.26.0"

#(use-modules (lily page))

#(define (page-info page-break-algorithm)
(lambda (paper-book)
    (let ((pages (page-break-algorithm paper-book)))
      (for-each
        (lambda (page n) (ly:message "page ~s: ~s systems\n" n (length 
(page-property page 'lines))))
        pages (iota (length pages) 1))
      pages)))

\paper {
   page-breaking = #(page-info ly:optimal-breaking)
}

\score {
   <<
     {
       \repeat unfold 5 { c'4 d' e' f' g' a' b' c'' }
       \pageBreak
       \repeat unfold 65 { c'4 d' e' f' g' a' b' c'' }
     }
     \repeat unfold 70 { c'4 d' e' f' g' a' b' c'' }
   >>
}


-- 
Timothy Lanfear, Bristol, UK.