layout.line_break_every_prolated

abjad.tools.layout.line_break_every_prolated(expr, line_duration, klass=<class 'abjad.measure.measure._Measure'>, adjust_eol=False)

Iterate klass instances in expr and accumulate prolated duration. Add line break after every total less than or equal to line_duration.

abjad> t = Staff(RigidMeasure((2, 8), construct.run(2)) * 4)
abjad> pitchtools.diatonicize(t)
abjad> print t.format
\new Staff {
                \time 2/8
                c'8
                d'8
                \time 2/8
                e'8
                f'8
                \time 2/8
                g'8
                a'8
                \time 2/8
                b'8
                c''8
}
abjad> layout.line_break_every_prolated(t, Rational(4, 8))      
abjad> print t.format
\new Staff {
                \time 2/8
                c'8
                d'8
                \time 2/8
                e'8
                f'8
                \break
                \time 2/8
                g'8
                a'8
                \time 2/8
                b'8
                c''8
                \break
}

Set adjust_eol to True to include a magic Scheme incantation to move end-of-line LilyPond TimeSignature and BarLine grobs to the right.

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