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#!/usr/bin/env python3
'''
bfind – Minimalitic `find` using breadth first crawling
Copyright © 2013 Mattias Andrée (maandree@member.fsf.org)
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 3 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, see <http://www.gnu.org/licenses/>.
'''
import sys
import os
xdev = False
hardlinks = False
symlinks = False
visible = False
ending = '\n'.encode('utf-8')
dashed = False
path = ''
for arg in sys.argv[1:]:
if dashed or arg[:1] != '-': path = arg
elif arg == '': dashed = True
else:
if arg == '--xdev' or (arg[:2] != '--' and 'x' in arg): xdev = True
if arg == '--hardlinks' or (arg[:2] != '--' and 'h' in arg): hardlinks = True
if arg == '--symlinks' or (arg[:2] != '--' and 's' in arg): symlinks = True
if arg == '--visible' or (arg[:2] != '--' and 'v' in arg): visible = True
if arg == '--print0' or (arg[:2] != '--' and '0' in arg): ending = '\0'.encode('utf-8')
visited_name = set()
visited_id = set()
queue = None
start_dev = os.stat(path if path != '' else '.').st_dev
start_len = len(path)
if path == '':
queue = os.listdir()
else:
queue = [path]
while len(queue) > 0:
path = queue[0]
queue[:] = queue[1:]
if visible:
if (os.sep + '.') in path[start_len:]:
continue
elif (start_len == 0) and path.startswith('.'):
continue
if hardlinks:
stat = os.stat(path)
stat = (stat.st_dev, stat.st_ino)
if stat in visited_id:
continue
visited_id.add(stat)
elif symlinks: ## no need if dev/ino is tested
if os.path.realpath(path) in visited_name:
continue
visited_name.add(os.path.realpath(path))
sys.stdout.buffer.write(path.encode('utf-8'))
sys.stdout.buffer.write(ending)
sys.stdout.buffer.flush()
if not xdev:
try:
if os.stat(path).st_dev != start_dev:
continue
except:
pass # link is broken
if os.path.isdir(path) and (symlinks or not os.path.islink(path)):
try:
for subd in os.listdir(path):
subd = path + os.sep + subd
queue.append(subd)
except PermissionError:
print('Permission denied: %s' % path)
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