Method write

src/black/cache.py:133–150

Update the cache file data and write a new cache file.

(self, sources: Iterable[Path])

        return changed, done

    def write(self, sources: Iterable[Path]) -> None:
        class="st">""class="st">"Update the cache file data and write a new cache file."class="st">""
        self.file_data.update(
            **{str(src.resolve()): Cache.get_file_data(src) for src in sources}
        )
        try:
            CACHE_DIR.mkdir(parents=True, exist_ok=True)
            with tempfile.NamedTemporaryFile(
                dir=str(self.cache_file.parent), delete=False
            ) as f:
                class="cm"># We store raw tuples in the cache because it's faster.
                data: dict[str, tuple[float, int, str]] = {
                    k: (*v,) for k, v in self.file_data.items()
                }
                pickle.dump(data, f, protocol=4)
            os.replace(f.name, self.cache_file)
        except OSError:
            pass