Feature Request: Get dot file without using UI

[afri-bit]

Hi,

I would like to get dotfile from rqt_graph without executing UI and save the graph as dot file manually. Is it possible to reimplement the following feature from rxgraph (deprecated) into rqt_graph?

http://wiki.ros.org/rxgraph

-o DOTFILE, --dot=DOTFILE
                      ouput graph as graphviz dot file

Thanks in advance.

[dirk-thomas]

Please consider to contribute a pull request with that enhancement.