import importlib
import logging
import pathlib

logger = logging.getLogger('import2ledger')

def load_modules(src_dir_path):
    rel_path = src_dir_path.relative_to(pathlib.Path(__file__).parent)
    import_prefix = 'import2ledger.{}.'.format('.'.join(rel_path.parts))
    for py_path in src_dir_path.glob('*.py'):
        mod_name = py_path.name[:-3]
        if mod_name.startswith(('.', '_')):
            continue
        try:
            module = importlib.import_module(import_prefix + mod_name)
        except ImportError as error:
            logger.info("failed to import %s: %s", py_path, error,
                        exc_info=logger.isEnabledFor(logging.DEBUG))
        else:
            yield module

def module_contents(module):
    for name in dir(module):
        yield name, getattr(module, name)

def submodule_items_named(file_path, name_test):
    for module in load_modules(pathlib.Path(file_path).parent):
        for name, item in module_contents(module):
            if name_test(name):
                yield item