DunePathHelper
--------------

Helper commands to query path variables of Dune modules.

.. cmake:command:: dune_module_path

  Return a selected path associated with a Dune module.

  .. code-block:: cmake

    dune_module_path(
      MODULE <module>
      RESULT <result>
      [CMAKE_MODULES|BUILD_DIR|SOURCE_DIR|SCRIPT_DIR]
    )

  ``MODULE``
    The name of the module whose path is requested.

  ``RESULT``
    The name of the output variable receiving the result.

  ``CMAKE_MODULES``
    Return the path to the module's CMake modules directory.

  ``BUILD_DIR``
    Return the path to the module's build directory.

  ``SOURCE_DIR``
    Return the path to the module's source directory.

  ``SCRIPT_DIR``
    Return the path to the module's CMake scripts directory.

  Exactly one path selector must be requested. The returned path depends on
  whether the command is called from the module itself or from a dependent
  module that already knows the exported path variables.