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# Copyright (C) 2008 Lars Wirzenius <liw@iki.fi>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""Walk a directory tree."""
import os
def depth_first(top, prune=None):
"""Walk a directory tree depth-first, except for unwanted subdirs.
This is, essentially, 'os.walk(top, topdown=False)', except that
if the prune argument is set, we call it before descending to
sub-directories to allow it to remove any directories and files
the caller does not want to know about.
If set, prune must be a function that gets three arguments (current
directory, list of sub-directory names, list of files in directory),
and must modify the two lists _in_place_. For example:
def prune(dirname, dirnames, filenames):
if ".bzr" in dirnames:
dirnames.remove(".bzr")
The dirnames and filenames lists contain basenames, relative to
dirname.
"""
# We walk topdown, since that's the only way os.walk allows us to
# do any pruning. We use os.walk to get the exact same error handling
# and other logic it uses.
for dirname, dirnames, filenames in os.walk(top):
# Prune. This modifies dirnames and filenames in place.
if prune:
prune(dirname, dirnames, filenames)
# Make a duplicate of the dirnames, then empty the existing list.
# This way, os.walk won't try to walk to subdirectories. We'll
# do that manually.
real_dirnames = dirnames[:]
del dirnames[:]
# Process subdirectories, recursively.
for subdirname in real_dirnames:
subdirpath = os.path.join(dirname, subdirname)
for x in depth_first(subdirpath, prune=prune):
yield x
# Return current directory last.
yield dirname, real_dirnames, filenames
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