Add subgroups to allow sorting within a group

[hacfi]

Example .formatter.yml:

use-sort:
    group:
        - [Symfony\Component\HttpKernel, Symfony]
        - _main
        - App

to put Symfony\Component\HttpKernel classes on top of the group

Fixes #10

[hacfi]

ping @mmoreram

[mmoreram]

@hacfi I've been so busy :( After the Con I will review both PRs and I'll merge them. Thanks for your effort :)

[mmoreram]

ping @hacfi I need this feature to be tested properly, and to be ensured that:

• Has no BCBreaks
• The new feature is working (I like this feature)

Thanks

[hacfi]

@mmoreram Sorry..overlooked that there are already tests. Will work on them next week.

[hacfi]

Had a little rebase conflict because of my other PR but all fixed now.

Included a small test for both this PR and #12. Wasn’t sure how to test for no bc breaks but all previous tests passed!?

[hacfi]

@mmoreram anything missing?

[xphere]

ping @mmoreram :grin:

[hacfi]

RTM @mmoreram :grinning:

[mmoreram]

@hacfi Could you please document this feature? Ready to be merged...

[hacfi]

@mmoreram Sure. Just noticed that this feature can’t be used without the config or is there a way to pass an array as a cli argument?

[hacfi]

Fixed some typos while I was at it

[xphere]

Just found I can't join _main with another namespaces inside same group, like:

use-sort:
    group:
        - [ Symfony, _main ]
        - Elcodi

[hacfi]

@xphere Will have a look on the weekend..I only had sub-namespaces in mind so didn’t check that.

[mmoreram]

Hmmm ok :) Please, fix asap as possible :')

[hacfi]

I don’t really understand the use-case but will try to fix it asap.

[mmoreram]

well, let's find out what the problem is, let's add some tests in order to make them fail, and then, let's fix it :dancer:

ASk me some help if you need it ! :)