initial command line interface

[Karsten1987]

Provides entry points for record, play, info

[Karsten1987]

CI (only on Linux, testing mainly for linters):

I would ask for early (style) feedback, because I see this as the base interface construct for the ros2 bag verb.

[wjwwood]

Is this intended for review and merge?

I don't feel like what's here needs review. It doesn't do anything but put the arguments it's given, so it's more like a skeleton for future work. I guess the verb's you've selected are ok (info, record, play), so I'd say just merge it without review until there's a larger (or trickier) chunk of code to review.

[mikaelarguedas]

Could this file just be empty and the dependency on rclpy removed from the package.xml ?

[dirk-thomas]

Requesting feedback on the verbs and arguments is good. Until this patch contain any actual functionality I would suggest not to merge it yet. Simply because users building from source might be confused about the presence of the command but not doing anything.

[wjwwood]

Well, they already added empty packages (see this as similar skeleton work). I don't think this repository is part of the default package list, so that mitigates it as well. I was trying to accommodate @Karsten1987's expressed desired to merge more frequent and smaller pr's (I think he mentioned that at some point).

@Karsten1987 you could add a disclaimer to all the commands for now, or merge into a working branch until you're ready for something on master.

[mikaelarguedas]

lgtm,

the pytest dependency is unused but I assume that this package will have tests soon so I guess it's fine to keep it.