Enhancement Request: output pipe for interogation commands

[nabed <ss...@ol...>]

Hi

Would it be possible to add the ability recieve output from gnuplot, over
stdout to enable command driven bi-directional communication with gnuplot.
That way a program could start an embedded gnuplot process and monitor the
processes input and outpout streams to do bi-directional communication. 

Specifically I would want to be able to use this text output pipe mechanism
to:

1)  get the region displayed by the graph, after the user has finished
interactively zooming and panning. (get_xxx)

2) to be able to set when the user can interact with gnuplot or not i.e.
toggle interaction mode.

3) to be able to be able to put gnuplot in a mode which allows the user to
toggle the addition and removal of new data points and to output point_added
and point_removed notifications.

Thanks,
Serle
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