X-Git-Url: https://wannabe.guru.org/gitweb/?a=blobdiff_plain;ds=sidebyside;f=file_utils.py;h=525a1afb0e262e93082f91dc8860a932575ed27a;hb=b10d30a46e601c9ee1f843241f2d69a1f90f7a94;hp=7cc8b632ac692d47a6f272403100c6806dc19136;hpb=dab5654d392f69fb00bed49cf8ffb80f37642ea5;p=python_utils.git

diff --git a/file_utils.py b/file_utils.py
index 7cc8b63..525a1af 100644
--- a/file_utils.py
+++ b/file_utils.py
@@ -7,12 +7,13 @@ import errno
 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
-
-import datetime_utils
+from uuid import uuid4
 
 
 logger = logging.getLogger(__name__)
@@ -200,13 +201,14 @@ def get_file_mtime_timedelta(filename: str) -> Optional[datetime.timedelta]:
 def describe_file_timestamp(
     filename: str, extractor, *, brief=False
 ) -> Optional[str]:
+    from datetime_utils import describe_duration, describe_duration_briefly
     age = get_file_timestamp_age_seconds(filename, extractor)
     if age is None:
         return None
     if brief:
-        return datetime_utils.describe_duration_briefly(age)
+        return describe_duration_briefly(age)
     else:
-        return datetime_utils.describe_duration(age)
+        return describe_duration(age)
 
 
 def describe_file_atime(filename: str, *, brief=False) -> Optional[str]:
@@ -221,6 +223,10 @@ def describe_file_mtime(filename: str, *, brief=False) -> Optional[str]:
     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
@@ -244,5 +250,27 @@ def get_files_recursive(directory: str):
     for filename in get_files(directory):
         yield filename
     for subdir in get_directories(directory):
-        for filename in get_files_recursive(subdir):
-            yield filename
+        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