rmakers_and_timespans.py

import abjad
import abjadext.rmakers
import itertools


note_rmaker = abjadext.rmakers.NoteRhythmMaker(
    tie_specifier=abjadext.rmakers.TieSpecifier(
        tie_across_divisions=True,
        tie_consecutive_notes=True,
        ),
    )
talea_rmaker = abjadext.rmakers.TaleaRhythmMaker(
    talea=abjadext.rmakers.Talea(counts=[1], denominator=16),
    )
mask = abjadext.rmakers.SilenceMask(pattern=abjad.index_all())
silence_rmaker = abjadext.rmakers.NoteRhythmMaker(division_masks=[mask])


timespan_list = abjad.TimespanList([
    abjad.AnnotatedTimespan(
        start_offset=(0, 4),
        stop_offset=(3, 4),
        annotation=note_rmaker,
        ),
    abjad.AnnotatedTimespan(
        start_offset=(3, 4),
        stop_offset=(5, 4),
        annotation=note_rmaker,
        ),
    abjad.AnnotatedTimespan(
        start_offset=(5, 4),
        stop_offset=(7, 4),
        annotation=talea_rmaker,
        ),
    abjad.AnnotatedTimespan(
        start_offset=(10, 4),
        stop_offset=(12, 4),
        annotation=note_rmaker,
        ),
    ])

timespan_list.extend(~timespan_list)
timespan_list.sort()

split_timespans = abjad.TimespanList()
for shard in timespan_list.split_at_offsets([(4, 4), (8, 4)]):
    split_timespans.extend(shard)
split_timespans.sort()

staff = abjad.Staff()

# Group timespans by the equality of their annotations
for annotation, timespans in itertools.groupby(
    split_timespans,
    key=lambda x: getattr(x, 'annotation', None)
):
    # Pull the timespans out of the subgroup iterator
    print('Before:', timespans)
    timespans = list(timespans)
    print('After:', timespans)
    # Get the durations from my timespan subgroup
    cell_durations = [timespan.duration for timespan in timespans]
    # Get an rmaker or convert None into a silence rmaker
    rmaker = annotation
    if rmaker is None:
        rmaker = silence_rmaker
    # Call my rmaker against my list of durations
    rmaker_music = rmaker(cell_durations)
    # Extend the results of the rmaker into my staff
    staff.extend(rmaker_music)

abjad.show(staff)