1# Copyright 2018 Google LLC 2# 3# Licensed under the Apache License, Version 2.0 (the "License"); 4# you may not use this file except in compliance with the License. 5# You may obtain a copy of the License at 6# 7# https://www.apache.org/licenses/LICENSE-2.0 8# 9# Unless required by applicable law or agreed to in writing, software 10# distributed under the License is distributed on an "AS IS" BASIS, 11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12# See the License for the specific language governing permissions and 13# limitations under the License. 14 15"""Tracked paths. 16 17This is a bit of a hack. 18""" 19 20import pathlib 21 22 23_tracked_paths = [] 24 25 26def add(path): 27 _tracked_paths.append(pathlib.Path(path)) 28 # Reverse sort the list, so that the deepest paths get matched first. 29 _tracked_paths.sort(key=lambda s: -len(str(s))) 30 31 32def relativize(path): 33 path = pathlib.Path(path) 34 for tracked_path in _tracked_paths: 35 try: 36 return path.relative_to(tracked_path) 37 except ValueError: 38 pass 39 raise ValueError(f"The root for {path} is not tracked.") 40