Handling shell arguments with different plugins

[vans163]

In relation to this. vans163/rebar3_auto#3

Running a plugin like rebar3_auto does not apparently allow to pass shell arguments.

Either you are running 'rebar3 auto', or you are running 'rebar3 shell name "node@localhost"'.

Perhaps add a way to support this, priority is minor.

[ferd]

You can just take the arguments from your own plugin and re-set them in the State for the next provider coming on. You'll need to declare them as available to your own plugin, but otherwise it should work.

[ferd]

I believe this answer is all we have right now, no better way to do it without changing things in major ways. Will close this as answered.

[vans163]

You can just take the arguments from your own plugin and re-set them in the State for the next provider coming on. You'll need to declare them as available to your own plugin, but otherwise it should work.

Would you have an example available on how to do this?

[ferd]

Well, that's a 7 years old post, so I don't know that I would say the exact same today. We actually don't set them much in most places, but we do around things like code coverage:

rebar3/apps/rebar/src/rebar_prv_eunit.erl

Lines 551 to 557 in 837ccb0

	maybe_cover_compile(State) ->
	{RawOpts, _} = rebar_state:command_parsed_args(State),
	State1 = case proplists:get_value(cover, RawOpts, false) of
	true -> rebar_state:set(State, cover_enabled, true);
	false -> State
	end,
	rebar_prv_cover:maybe_cover_compile(State1).

It happens in this case that the coverage handler does not even check command line arguments, but that's how it would work. There's also some stuff in rebar_opts that can handle it: https://github.com/search?q=repo%3Aerlang%2Frebar3+rebar_opts%3Aset&type=code

Most places that handle configuration check both for command-line arguments and for stuff set in rebar.config. So if your command reads it from the command line, it can write it to wherever the other config is handled and that will be the default in the command you call in turn.