build hooks should be able to exclude files

[virtuald]

This probably comes up a lot when trying to write hatch plugins that compile native code. Let's say that you're writing a cmake plugin for hatch, you would want the build hook to be able to automatically exclude CMakeLists.txt (and probably the .cpp files too) from the built wheel without the user needing to manually add it to their pyproject.toml.

[virtuald]

Hm, maybe I spoke too soon, this appears to work from plugin initialize function:

        build_config = self.build_config.build_config
        if "exclude" in build_config:
            build_config.append("CMakeLists.txt")
        else:
            build_config["exclude"] = ["CMakeLists.txt"]

... but this seems unintentional and it probably isn't something that should be relied on to work?

[virtuald]

Ok, this works, but once again it seems pretty brittle:

       build_config = self.build_config.build_config
        wheel_config = build_config.get("targets", {}).get("wheel", {})
        if "exclude" in wheel_config:
            wheel_config["exclude"] += to_exclude
        elif "exclude" in build_config:
            build_config["exclude"] += to_exclude
        else:
            build_config["exclude"] = to_exclude