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#!/usr/bin/env python
#
# Copyright 2010 The Closure Library Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS-IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Shared utility functions for scanning directory trees."""
import os
import re
__author__ = 'nnaze@google.com (Nathan Naze)'
# Matches a .js file path.
_JS_FILE_REGEX = re.compile(r'^.+\.js$')
def ScanTreeForJsFiles(root):
"""Scans a directory tree for JavaScript files.
Args:
root: str, Path to a root directory.
Returns:
An iterable of paths to JS files, relative to cwd.
"""
return ScanTree(root, path_filter=_JS_FILE_REGEX)
def ScanTree(root, path_filter=None, ignore_hidden=True):
"""Scans a directory tree for files.
Args:
root: str, Path to a root directory.
path_filter: A regular expression filter. If set, only paths matching
the path_filter are returned.
ignore_hidden: If True, do not follow or return hidden directories or files
(those starting with a '.' character).
Yields:
A string path to files, relative to cwd.
"""
def OnError(os_error):
raise os_error
for dirpath, dirnames, filenames in os.walk(root, onerror=OnError):
# os.walk allows us to modify dirnames to prevent decent into particular
# directories. Avoid hidden directories.
for dirname in dirnames:
if ignore_hidden and dirname.startswith('.'):
dirnames.remove(dirname)
for filename in filenames:
# nothing that starts with '.'
if ignore_hidden and filename.startswith('.'):
continue
fullpath = os.path.join(dirpath, filename)
if path_filter and not path_filter.match(fullpath):
continue
yield os.path.normpath(fullpath)
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