Support composer bin plugin for vendor files

[provokateurin]

Description

phpantom should support indexing vendor files installed via https://github.com/bamarni/composer-bin-plugin, while they are ignored via a .gitignore file. Many projects use the composer bin plugin for separating production and development dependencies (mostly to avoid clashing version constraints between direct and peer dependencies), so it would be great to support such project structures.

Use case

I'm trying to use phpantom with Gram (Zed fork) on the https://github.com/nextcloud/server codebase.
It is super quick despite the massive size of the project, however I found some issues in tests.
For example when opening tests/lib/TestCase.php it will complain that the class \PHPUnit\Framework\TestCase is not found.
We have phpunit installed in vendor-bin/phpunit/composer.json, but the vendor-bin/phpunit/vendor files are gitignored.
As soon as I remove this line from the root .gitignore, it starts working: /vendor-bin/**/vendor.

Proposed solution

No response

Alternatives considered

An alternative solution could be to provide an option to unignore certain paths. That would be a bit more flexible and could be used in other edge cases as well.

Code example

[provokateurin]

Oh I didn't check for PRs when checking if someone already reported this issue. With #336 the alternative fix/workaround would already be possible, but it would be great to just support the composer bin plugin OOTB.

[AJenbo]

We did just add support for the opposite ... 87c6255

[provokateurin]

So using the ! should work with that? Or will it not override the ignores from the .gitignore file in the repo?

[AJenbo]

it doesn't support double negatives, but it does tell us what pattern to follow