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      1 # Copyright 2018 - The Android Open Source Project
      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 #     http://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 """File-related utilities."""
     16 
     17 
     18 import os
     19 import shutil
     20 import tempfile
     21 
     22 
     23 def make_parent_dirs(file_path):
     24     """Creates parent directories for the file_path."""
     25     if os.path.exists(file_path):
     26         return
     27 
     28     parent_dir = os.path.dirname(file_path)
     29     if parent_dir and not os.path.exists(parent_dir):
     30         os.makedirs(parent_dir)
     31 
     32 
     33 def filter_out(pattern_files, input_file):
     34     """"Removes lines in input_file that match any line in pattern_files."""
     35 
     36     # Prepares patterns.
     37     patterns = []
     38     for f in pattern_files:
     39         patterns.extend(open(f).readlines())
     40 
     41     # Copy lines that are not in the pattern.
     42     tmp_output = tempfile.NamedTemporaryFile()
     43     with open(input_file, 'r') as in_file:
     44         tmp_output.writelines(line for line in in_file.readlines()
     45                               if line not in patterns)
     46         tmp_output.flush()
     47 
     48     # Replaces the input_file.
     49     shutil.copyfile(tmp_output.name, input_file)
     50