Support field paths in the info command

[iredchuk]

yarn info should support field paths for the second argument (fields separated by the dot), like npm info does.

yarn info yarn dist-tags.latest
Should output
0.17.10

Also
yarn info
Should be equivalent to
yarn info .
i.e. output info on the local package.

• Also default to local package when second arg is not specified
• Fixes yarn info doesn't support field paths #2175

[wyze]

Could you add a test please?

[iredchuk]

@wyze Would be happy to add tests, but at the moment there's no tests for info command. So I will have to set them up, need to look into that. I would rather completely mock the response from registry, but it seems like other commands rather work with a real registry. What do you think?

[wyze]

I think for now it is okay to hit the real registry. I know the tests for outdated hits the real registry.

[iredchuk]

OK, I'll try + also test the existing cases. Test setups for commands look a bit complicated at the first look, so need to wrap my head around it.

[iredchuk]

@wyze Added tests

[wyze]

Thanks @iredchuk!