Using Abjad and Lilypond in CoCalc

In a CoCalc terminal, run

pip3 install Abjad
pip3 install abjad-ext-ipython

Then, as this worksheet shows, displaying music works!

What does not work so far is playing music. This is because abjad.play relies on timidity. Feature request for abjad.play: allow to specify a player, such as a javascript player.

For example, by allowing abjad.play(staff, player='midijs') or similar.

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import abjad

In [6]:

%load_ext abjadext.ipython

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note = abjad.Note()

In [8]:

note

Note("c'4")

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abjad.show(note)

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from random import randint
pitch_numbers = [randint(-7,24) for x in range(100)]
pitch_numbers[:10]

[8, 10, 11, 22, 3, 19, 22, -4, 20, -7]

In [11]:

notes = [abjad.Note(x,(1,32)) for x in pitch_numbers]

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staff = abjad.Staff(notes)

In [13]:

abjad.show(staff)

In [14]:

abjad.play(staff)

---------------------------------------------------------------------------
CalledProcessError                        Traceback (most recent call last)
<ipython-input-14-86a9b915fe20> in <module>()
----> 1 abjad.play(staff)

~/.local/lib/python3.6/site-packages/abjadext/ipython/Play.py in __call__(self, argument)
     24         if not hasattr(argument, '__illustrate__'):
     25             raise TypeError('Cannot play {!r}'.format(type(argument)))
---> 26         has_vorbis = self._check_for_vorbis()
     27         with tempfile.TemporaryDirectory() as temporary_directory:
     28             temporary_directory = pathlib.Path(temporary_directory)
~/.local/lib/python3.6/site-packages/abjadext/ipython/Play.py in _check_for_vorbis(self)
     48     def _check_for_vorbis(self):
     49         has_vorbis = False
---> 50         output = subprocess.check_output('timidity --help', shell=True)
     51         output = output.decode('utf-8')
     52         for line in output.splitlines():
/usr/lib/python3.6/subprocess.py in check_output(timeout, *popenargs, **kwargs)
    334 
    335     return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
--> 336                **kwargs).stdout
    337 
    338 
/usr/lib/python3.6/subprocess.py in run(input, timeout, check, *popenargs, **kwargs)
    416         if check and retcode:
    417             raise CalledProcessError(retcode, process.args,
--> 418                                      output=stdout, stderr=stderr)
    419     return CompletedProcess(process.args, retcode, stdout, stderr)
    420 
CalledProcessError: Command 'timidity --help' returned non-zero exit status 127.

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