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livechart's Issues

add support for multi-line JSON objects

The tool currently expects each new data-point to sit on its own line, like:

{"foo":"bar"}
{"foo":"bar"}
{"foo":"bar"}
{"foo":"bar"}

Try to add support for multi-line inputs, like:

{
    "foo": "bar"
}
{
    "foo": "bar"
}
{
    "foo": "bar"
}
{
    "foo": "bar"
}

add option to bulk-chart data

If you have a file containing lots of numbers already sitting around, it's painfully slow to sequentially render it by piping it into livechart. Provide an option for bulk loading points from a file.

re-render the graph only at set intervals

A fast feeder stream will overwhelm livechart because it renders so slowly. There's no practical reason to redraw the graph for every data point, so only do so at regular (configurable) intervals.

failed parsing is mishandled: UnboundLocalError 

No JSON object could be decodedFailed to parse JSON for line:
Traceback (most recent call last):
  File "/usr/local/bin/livechart", line 9, in <module>
    load_entry_point('livechart==0.0.2', 'console_scripts', 'livechart')()
  File "/usr/local/lib/python2.7/site-packages/livechart/script.py", line 66, in run
    sys.exit(chart.render_stdin(parse_args()))
  File "/usr/local/lib/python2.7/site-packages/livechart/chart.py", line 99, in render_stdin
    for key, val in parse_json(line).items():
  File "/usr/local/lib/python2.7/site-packages/livechart/chart.py", line 29, in parse_json
    if isinstance(json_blob, (int, float)):
UnboundLocalError: local variable 'json_blob' referenced before assignment
Exception KeyError: KeyError(140735190991616,) in <module 'threading' from '/usr/local/Cellar/python/2.7.8_2/Frameworks/Python.framework/Versions/2.7/lib/python2.7/threading.pyc'> ignored

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