more efficient algorithm for getting applied templates with sources

Line 115 in 170bd1e

# TODO: more efficient algorithm for getting applied templates with sources

        config: Optional[FlexlateConfig] = None,
    ) -> List[AppliedTemplateWithSource]:
        config = config or self.load_config(project_root)

        # TODO: more efficient algorithm for getting applied templates with sources

        def get_source_config_path(source_name: str) -> Path:
            if config is None:
                raise ValueError("should not hit this, for type narrowing")
            for child_config in config.child_configs:
                for source in child_config.template_sources:
                    if source.name == source_name:
                        return child_config.settings.config_location
            raise ValueError(f"could not find source {source_name}")

        sources = config.template_sources_dict
        applied_template_with_sources: List[AppliedTemplateWithSource] = []

        for child_config in config.child_configs:
            for i, applied_template in enumerate(child_config.applied_templates):
                source = sources[applied_template.name]
                source_config_path = get_source_config_path(source.name)
                applied_template_config_path = child_config.settings.config_location
                if (
                    relative_to is not None
                    and source.git_url is None
                    and not Path(source.path).is_absolute()
                ):
                    new_path = (relative_to / Path(source.path)).resolve()
                    use_source = source.copy(update=dict(path=new_path))
                else:
                    use_source = source
                applied_template_with_sources.append(
                    AppliedTemplateWithSource(
                        applied_template=applied_template,
                        source=use_source,
                        index=i,
                        source_config_path=source_config_path,
                        applied_template_config_path=applied_template_config_path,
                    )
                )
        return applied_template_with_sources

    def get_all_renderables(

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