Is it possible to create a custom type path schema type, that transforms relative paths to absolute paths, that works together with DI?

[ruudk]

Heads up: I don't have much experience with Nette so forgive me if this is a silly question.

For Nette Schema I want to configure a new type called path that's basically a string that transforms relative paths to an absolute path depending on where they are loaded.

Example:

# src/Config/config.neon
parameters:
  myPath: some-file.neon

The myPath parameter should be transformed to an absolute path, relative to the configuration file: src/Config/some-file.neon.

When the path is absolute, it should be kept as is.

PHPStan solves this by creating a Nette\DI\Config\Adapter and then process the paths like this:
https://github.com/phpstan/phpstan-src/blob/e8027e7a59ba4e70925c89df51081902aa577e03/src/DependencyInjection/NeonAdapter.php#L122-L146

The downside of this approach is that it's not generic, and when other extensions want to use it, it needs to be added.

So my thought was: why can't we register a path type, that takes care of this?

I might be able to do this in pure PHP using transformations like this:
https://github.com/nette/schema?tab=readme-ov-file#transformation-transform

But this is how PHPStan's does it, and it loads the parametersSchema from neon, and then processes it like this:
https://github.com/phpstan/phpstan-src/blob/e8027e7a59ba4e70925c89df51081902aa577e03/src/DependencyInjection/ContainerFactory.php#L342-L351