import hashlib
import logging
import os
+import io
+import pathlib
import time
from typing import Optional
import glob
from os.path import isfile, join, exists
+from uuid import uuid4
+
logger = logging.getLogger(__name__)
def does_file_exist(filename: str) -> bool:
+ """Returns True if a file exists and is a normal file.
+
+ >>> does_file_exist(__file__)
+ True
+ """
return os.path.exists(filename) and os.path.isfile(filename)
def does_directory_exist(dirname: str) -> bool:
+ """Returns True if a file exists and is a directory.
+
+ >>> does_directory_exist('/tmp')
+ True
+ """
return os.path.exists(dirname) and os.path.isdir(dirname)
def does_path_exist(pathname: str) -> bool:
+ """Just a more verbose wrapper around os.path.exists."""
return os.path.exists(pathname)
def get_file_size(filename: str) -> int:
+ """Returns the size of a file in bytes."""
return os.path.getsize(filename)
def is_normal_file(filename: str) -> bool:
+ """Returns True if filename is a normal file.
+
+ >>> is_normal_file(__file__)
+ True
+ """
return os.path.isfile(filename)
def is_directory(filename: str) -> bool:
+ """Returns True if filename is a directory.
+
+ >>> is_directory('/tmp')
+ True
+ """
return os.path.isdir(filename)
return describe_file_timestamp(filename, lambda x: x.st_mtime, brief=brief)
+def touch_file(filename: str) -> bool:
+ return pathlib.Path(filename).touch()
+
+
def expand_globs(in_filename: str):
for filename in glob.glob(in_filename):
yield filename
for subdir in get_directories(directory):
for file_or_directory in get_files_recursive(subdir):
yield file_or_directory
+
+
+class FileWriter(object):
+ def __init__(self, filename: str) -> None:
+ self.filename = filename
+ uuid = uuid4()
+ self.tempfile = f'{filename}-{uuid}.tmp'
+ self.handle = None
+
+ def __enter__(self) -> io.TextIOWrapper:
+ assert not does_path_exist(self.tempfile)
+ self.handle = open(self.tempfile, mode="w")
+ return self.handle
+
+ def __exit__(self, exc_type, exc_val, exc_tb) -> bool:
+ if self.handle is not None:
+ self.handle.close()
+ cmd = f'/bin/mv -f {self.tempfile} {self.filename}'
+ ret = os.system(cmd)
+ if (ret >> 8) != 0:
+ raise Exception(f'{cmd} failed, exit value {ret>>8}')
+ return None
+
+
+if __name__ == '__main__':
+ import doctest
+ doctest.testmod()