Support unidirectional bridge topics

[nkoenig]

Allow the use of @, [, or ] between the message types to indicate if a bridge should be bidirectional, to ROS, or to IGN.

[nkoenig]

See: https://bitbucket.org/osrf/subt/pull-requests/270

[AlejoAsd]

In this comment, you're mentioning @, < and > are used to indicate direction. However, the code suggests it's actually [ and ] for unidirectional communication.

[nkoenig]

Fixed.

[azeey]

FYI, just noticed that zsh doesn't like the [ character on the command line. I had to wrap the whole argument to parameter_bridge in quotes. Maybe we can mention that when the examples in the README are updated.

[mjcarroll]

@azeey That's a function of zsh's globbing. If you have setopt extendedglob somewhere in your config, that's going to happen.

You can also prefix the command with noglob or alias rosrun=noglob rosrun to get around that.

[nkoenig]

I'm also open to using other characters. The <, > symbols can't be used either.

[mjcarroll]

I personally think that the inconvenience around [] with zsh is pretty minor.

Most of the time, I would imagine that this is going through a launch file of some sort, where it is a non-issue.