Commits on Apr 7, 2023

1. NEW. Added abjad.VoiceNumber(n=None) indicator. …

   Set n to 1, 2, 3, 4 or none. Models LilyPond ``\voiceOne``,
   ``\voiceTwo``, ``\voiceThree``, ``\voiceFour``, ``\oneVoice`` commands.
   
       def make_staff():
           staff = abjad.Staff()
           voice_1 = abjad.Voice("g'8 a' b' c''")
           command = abjad.VoiceNumber(n=1)
           abjad.attach(command, voice_1[0])
           voice_2 = abjad.Voice("e'8 f' g' a'")
           command = abjad.VoiceNumber(n=2)
           abjad.attach(command, voice_2[0])
           container = abjad.Container([voice_1, voice_2], simultaneous=True)
           staff.append(container)
           voice = abjad.Voice("c''4 a'")
           command = abjad.VoiceNumber()
           abjad.attach(command, voice[0])
           staff.append(voice)
   
       >>> staff = make_staff()
       >>> string = abjad.lilypond(staff)
       >>> print(string)
       \new Staff
       {
           <<
               \new Voice
               {
                   \voiceOne
                   g'8
                   a'8
                   b'8
                   c''8
               }
               \new Voice
               {
                   \voiceTwo
                   e'8
                   f'8
                   g'8
                   a'8
               }
           >>
           \new Voice
           {
               \oneVoice
               c''4
               a'4
           }
       }
   
   The abjad.VoiceNumber indicator is contexted at the level of
   abjad.Voice. Use abjad.get.effective() to get the abjad.VoiceNumber
   indicator in effect for any leaf:
   
       >>> for leaf in abjad.select.leaves(staff):
       ...     command = abjad.get.effective(leaf, abjad.VoiceNumber)
       ...     print(f"{leaf}, {command}")
       Note("g'8"), VoiceNumber(n=1)
       Note("a'8"), VoiceNumber(n=1)
       Note("b'8"), VoiceNumber(n=1)
       Note("c''8"), VoiceNumber(n=1)
       Note("e'8"), VoiceNumber(n=2)
       Note("f'8"), VoiceNumber(n=2)
       Note("g'8"), VoiceNumber(n=2)
       Note("a'8"), VoiceNumber(n=2)
       Note("c''4"), VoiceNumber(n=None)
       Note("a'4"), VoiceNumber(n=None)
   
   Closes #1135.

   

   trevorbaca committed Apr 7, 2023
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