Arvados

These would be utility methods to make it easier to write Python that generates CWL inputs. Something like:

class ArvadosFile(object):
    def keep_uri(self) -> str:
        return f'{self.parent.keep_uri()}/{self.name}'

class Collection(RichCollectionBase):
    def keep_uri(self, path: Optional[str]=None) -> str:
        if path is None:
            parts = [f'keep:{self.portable_data_hash()}']
            parts.extend(self.stream_name().split('/'))
            if parts[-1] == '.':
                parts.pop()
            parts.append('')
            return '/'.join(parts)
        else:
            return self.find(path).keep_uri()

Basically given any file or collection object, it should be possible to get the corresponding keep: URI. This might need additional handling for corner cases but this is the gist.