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#!/usr/bin/env python3
"""Query or change the JACK transport state."""
import argparse
import string
import jack
def main(args=None):
ap = argparse.ArgumentParser(description=__doc__)
ap.add_argument(
'-c', '--client-name',
metavar='NAME',
default='transporter',
help='JACK client name (default: %(default)s)')
ap.add_argument(
'command',
nargs='?',
default='status',
choices=['query', 'rewind', 'start', 'status', 'stop', 'toggle'],
help='transport command')
args = ap.parse_args(args)
try:
client = jack.Client(args.client_name)
except jack.JackError as exc:
ap.exit('Could not create JACK client: {}'.format(exc))
state = client.transport_state
result = 0
if args.command == 'status':
print('JACK transport state is {}.'.format(state))
result = 1 if state == jack.STOPPED else 0
elif args.command == 'query':
print('State: {}'.format(state))
info = client.transport_query()[1]
for field in sorted(info):
label = string.capwords(field.replace('_', ' '))
print('{}: {}'.format(label, info[field]))
result = 1 if state == jack.STOPPED else 0
elif args.command == 'start':
if state == jack.STOPPED:
client.transport_start()
elif args.command == 'stop':
if state != jack.STOPPED:
client.transport_stop()
elif args.command == 'toggle':
if state == jack.STOPPED:
client.transport_start()
else:
client.transport_stop()
elif args.command == 'rewind':
client.transport_frame = 0
client.close()
ap.exit(result)
if __name__ == '__main__':
main()
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