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56 lines
1.7 KiB
Python
Executable File
56 lines
1.7 KiB
Python
Executable File
#!/usr/bin/env python3
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# https://click.palletsprojects.com/en/8.1.x/arguments/
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# https://click.palletsprojects.com/en/8.1.x/options/
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import click
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import math
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import sys
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class AgoraCmd(click.Command):
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def format_help(self, ctx, formatter):
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click.echo("""Usage:
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- Visit anagora.org/hz to execute this file in the Agora of Flancia.
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- Visit e.g. anagora.org/hz/523 to test which note 523hz is the closest to (should return C5)
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- In general visit anagora.org/foo, anagora.org/foo/bar to execute e.g. <bin/foo.py bar> from your garden.
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""")
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def __call__(self, *args, **kwargs):
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try:
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return super(AgoraCmd, self).__call__(
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*args, standalone_mode=False, **kwargs)
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except click.MissingParameter as exc:
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exc.ctx = None
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exc.show(file=sys.stdout)
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click.echo()
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try:
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super(AgoraCmd, self).__call__(['--help'])
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except SystemExit:
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sys.exit(exc.exit_code)
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@click.command(cls=AgoraCmd)
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@click.argument('freq', type=click.FLOAT)
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def hz(freq):
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"""Calculates the closest note to input hz :)"""
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A4 = 440
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# Number of half steps away.
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n = 12 * math.log2(freq / A4)
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n = round(n)
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note_index = n % 12
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notes = ["A", "A#", "B", "C", "C#", "D", "D#", "E", "F", "F#", "G", "G#"]
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note = notes[note_index]
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octave = 4 + (n // 12)
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if note in ["C", "C#", "D", "D#", "E", "F", "F#", "G", "G#"]:
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# compensate for the fact that octaves are counted from C
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octave += 1
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click.echo(f"hz({freq}) is {note}{str(octave)}.")
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# click.echo(f"hz({freq}) is {note}.")
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if __name__ == '__main__':
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hz()
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