Contexts, LilyPond type of

Working with LilyPond means understanding LilyPond contexts. Abjad implements only four concrete contexts: voice, staff, staff group, score. But LilyPond comes preloaded with 20 contexts: 9 voice contexts, 6 staff contexts, 4 staff group contexts and a score context:

http://lilypond.org/doc/v2.20/Documentation/notation/contexts-explained

Use Abjad’s concept of “LilyPond type” to work with any of LilyPond’s 20 predefined contexts.

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Setting LilyPond type at initialization

If you know the LilyPond type of a context you want to work with, you can set it at initialization:

>>> voice = abjad.Voice("c'4 d' e' f'", name="Music_Voice")
>>> staff = abjad.Staff(
...     [voice], lilypond_type="RhythmicStaff", name="Woodblock_Staff"
... )
>>> abjad.show(staff)

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Setting LilyPond type after initialization

You can change the LilyPond type of a context after initialization, too:

>>> voice = abjad.Voice("c'4 d' e' f'", name="Music_Voice")
>>> staff = abjad.Staff([voice], name="Woodblock_Staff")
>>> abjad.show(staff)

>>> staff.lilypond_type = "RhythmicStaff"
>>> abjad.show(staff)