Support for sections (Gitlab flavor)

[neiser]

The Gitlab documentation allows to introduce sections into the CODEOWNERS such as

[README Owners]
README.md @user1 @user2
internal/README.md @user2

That enables Gitlab to show the code ownership within the UI a little bit nicer. Currently, running this tool (version 1.1.1) on such a file leads to the following error:

$ codeowners
line 1: unexpected character '[' at position 1

Would you be willing to allow support for this? Would you accept a PR for that (I haven't looked into the code yet though)

[hmarr]

I'd be open to this, but as long as it's only enabled by passing in a flag (or by detecting the CODEOWNERS file in the .gitlab directory, perhaps). As this package is designed primarily to work with GitHub CODEOWNERS files, I'd rather it defaults to erroring loudly when it encounters invalid syntax.

[oonoo]

Just mentioning: came here for the same reason as the author of this issue. I would be also interested in a gitlab compatible solution (supporting/ignoring these sections).

[Wirone]

We're also interested in this. Few thoughts:

• it could default to Github's format, but could be changed with --flavour=gitlab on execution level
• things that should be taken into consideration:
  • support for sections ([Foo]) and optional sections (^[Bar]), currently it fails as reported in the issue
  • support for default owners for section ([Foo] @bar), not supported currently because it fails on parsing
  • support for nested project groups (@team/x/y), currently it fails with "invalid owner format"

Fingers crossed it can be implemented 🤞.