langkit/lkt/extensions/python_api/unit_providers/methods

## vim: filetype=makopython

    @classmethod
    def from_directories(cls, directories: list[str]) -> UnitProvider:
        """
        Return a unit provider that will look for units in the given list of
        directories. Note that the current directory is implicitly looked at
        first.
        """
        # Create a NULL-terminated array of strings
        c_strings = [
            ctypes.c_char_p(
                _coerce_bytes("directories", d, "a list of bytes strings")
            )
            for d in directories
        ]
        c_array_type = ctypes.c_char_p * (len(directories) + 1)
        c_array = c_array_type()
        for i, c_str in enumerate(c_strings):
            c_array[i] = c_str
        c_array[-1] = None

        c_array_ptr = ctypes.pointer(c_array)
        directories_arg = ctypes.cast(
            c_array_ptr, ctypes.POINTER(ctypes.c_char_p)
        )

        c_value = _create_default_provider(directories_arg)
        return _CUnitProvider(c_value)

    @classmethod
    def from_lkt_path(cls) -> UnitProvider:
        """
        Return a unit provider created from the ``LKT_PATH`` environment
        variable.
        """
        return cls.from_directories(
            os.environ.get("LKT_PATH", "").split(os.path.pathsep)
        )