ly:one-page-breaking (was: ly:one-line-breaking)

[Paul Morris]

> On Jan 9, 2016, at 1:30 PM, Richard Shann <address@hidden> wrote:
> 
> I was wondering if it would be possible to develop a variant of "all on
> one line", namely "all on one page", where the page height would be
> automatically adjusted to fit the music, leaving the width as set.

I’m glad to report that I’ve made some real progress.  The code in the attached 
patch delivers the basic functionality, with a few "known issues".  Namely the 
tagline and any footnotes are not included, and bookparts trigger default page 
breaking for some reason.  I haven’t tested it extensively but titles (etc.), 
top level markups, multiple scores, all seem to work just fine.

The approach is to temporarily set the page-height to the largest size 
possible, do the line breaking and page layout for that page height, then get 
the vertical position on the page and the height of the lowest system (or top 
level markup), and use that to calculate and then set the final page height so 
that it fits the content of the page.

(Also, I now see how to improve the ly:one-line-auto-height code to avoid some 
of the unintuitive results related to bottom-margin and top-system-spacing.  So 
a new patch set for that is on the way, when I can get to it...)

-Paul


%%% TEST SNIPPET %%%

\version "2.19.36"

\paper {
  % system-system-spacing.basic-distance = #0
  page-breaking = #ly:one-page-breaking
  % ragged-bottom = ##t
  % top-margin = 0
  % bottom-margin = 0
  % system-system-spacing.minimum-distance = #0
  % system-system-spacing.padding = #0
}

\header {
  % title = "a title”
  % tagline = ""
}

% \markup \large "top level markup"

\repeat unfold 100 { c’4 d' e' f’ }

\repeat unfold 10 { g'1 }

{ c,,,,,1 }

% \markup \large “another top level markup"

%%%%%%%%%

one-page-breaking-1-18-2016.patch
Description: Binary data