Python argparse模块实现模拟 linux 的ls命令

python 模拟linux的 ls 命令

sample: python custom_ls.py -alh c:/

选项:

-a ,--all 显示所有文件,包括'.'开头的隐藏文件

-l  列表显示每个文件详细信息

-h 以人类可读的方式显示,文件大小会被换算成 K、M、G、T 或 P 的单位

path

只能接受一个path路径,需要改进。

from pathlib import Path
import argparse
import datetime
import stat
import os def convert_mode(mode: int):
modelist = ['r', 'w', 'x', 'r', 'w', 'x', 'r', 'w', 'x']
m = mode & 0o777
modestr = bin(m)[-9:]
ret = ""
for i, v in enumerate(modestr):
if v == '1':
ret += modelist[i]
else:
ret += '-'
return ret def convert_type(file: Path):
ret = ""
if file.is_symlink():
ret = 'l'
elif file.is_fifo():
ret = 'p'
elif file.is_socket():
ret = 's'
elif file.is_block_device():
ret = 'b'
elif file.is_char_device():
ret = 'c'
elif file.is_dir():
ret = 'd'
elif file.is_file():
ret = '-'
else:
ret = '?'
return ret def list_dir(path: str = '.', all=False, detail=False, human=False):
units = ['', 'K', 'M', 'G', 'T', 'P'] def _convert_human(size: int):
depth = 0
while size >= 1024:
size = size // 1024
depth += 1
return "{}{}".format(size, units[depth]) def _show_dir(path: str = '.', all=False, detail=False, human=False):
p = Path(path)
for file in p.iterdir():
if not all and str(file.name).startswith('.'):
continue if detail:
st = file.stat() h = st.st_size
if human:
h = _convert_human(st.st_size) owner, group = st.st_uid, st.st_gid
if os.name == "posix":
owner, group = file.owner(), file.group() yield str((stat.filemode(st.st_mode), st.st_nlink, owner, group, str(h),
datetime.datetime.fromtimestamp(st.st_atime).strftime('%Y-%m-%d %H:%M:%S'),
file.name)).strip(
'()')
else:
yield str((file.name,)).strip('()') yield from sorted(_show_dir(args.path, args.all, args.l, args.h), key=lambda x: x[-1]) parser = argparse.ArgumentParser(prog='ls', add_help=False, description='list directory contents. --20171031')
parser.add_argument('path', nargs='?', default='.', help='give a path (files or direction)')
parser.add_argument('-l', action='store_true', help='List Display details')
parser.add_argument('-h', action='store_true', help='Human readable way to show "kmgtp" size')
parser.add_argument('-a', '--all', action='store_true', help='Show hidden files at the same time') if __name__ == '__main__':
args = parser.parse_args(('.', '-ahl'))
parser.print_help()
print('args=', args) for st in list_dir(args.path, args.all, args.l, args.h):
print(st)

  

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