update ReadMe & better support for relative path

README.md

@@ -15,12 +15,41 @@ To use the Windows binary (download on the [releases](https://github.com/cfbao/g
 * Windows update [KB2999226](https://support.microsoft.com/en-gb/help/2999226/update-for-universal-c-runtime-in-windows "Update for Universal C Runtime in Windows")
 
 ## How-to
-Download [cleaner.py](./cleaner.py) (or cleaner.exe) and place it in an empty local folder.
-
-The first time you run it, you will be prompted with Google authorization page asking you to grant permission. Once authorized, an authorization token will be saved in `.credentials\google-drive-trash-cleaner.json` under your home directory (`%UserProfile%` on Windows). You don't need to manually authorize again until you delete this file or revoke permission on your Google account page.
-
-By default, the script tries to retrieve the list of files trashed more than 30 days ago. This may take some time on the first run, because it searches your Google Drive activity history from the very beginning. The script prints the retrieved list of files on screen, and ask you to confirm whether you want to delete them. Once confirmed, these files are permanently deleted from Google Drive, and a new file named `page_token` is saved in the local folder cleaner.py<span>/</span>cleaner.exe is in. 
-
-`page_token` contains a single number that indicates the appropriate starting position in your Google Drive activity history for future searches. Therefore, future runs of the script will be much faster, and `page_token` will be successively updated.
-
-There are a few command line options that allows for some customizations. Run `cleaner -h` to learn about them.
+Download `cleaner`([.py](./cleaner.py) or [.exe](https://github.com/cfbao/google-drive-trash-cleaner/releases)), place it in an empty local folder, and run it from command line.
+
+By default, `cleaner` retrieves a list of all files trashed more than 30 days ago, and prints their info on screen.
+You're asked whether you want to delete them.
+If confirmed, these files are permanently deleted from Google Drive.
+
+### Google authorization
+The first time you run `cleaner`, you will be prompted with a Google authorization page asking you for permission to view and manage your Google Drive files.
+Once authorized, a credential file will be saved in `.credentials\google-drive-trash-cleaner.json` under your home directory (`%UserProfile%` on Windows).
+You don't need to manually authorize `cleaner` again until you delete this credential file or revoke permission on your Google [account](https://myaccount.google.com/permissions "Apps connected to your account") page.  
+You can specify a custom location for the credential file by using the command line option `--credfile`. This is helpful if you're using multiple Google accounts with `cleaner`.
+
+### `page_token` file
+`cleaner` finds out when your files were trashed by scanning through your Google Drive activity history.
+On first run, it must start from the very beginning to ensure no files are missed, so it might take some time.
+After first run, `cleaner` saves a file named `page_token` in its own parent folder.
+This file contains a single number indicating an appropriate starting position in your Google Drive activity history for future scans,
+so they can be much faster than the first one. Each run of `cleaner` updates `page_token` as appropriate.  
+You can specify a custom location or name for the `page_token` file by using the command line option `--ptokenfile`.
+
+### More options
+More command line options are available. You can read about them by running `cleaner --help`.
+```
+usage: cleaner.py [-h] [-a] [-v] [-d #] [-t SECS] [--logfile PATH]
+                  [--ptokenfile PATH] [--credfile PATH]
+
+optional arguments:
+  -h, --help            show this help message and exit
+  -a, --auto            Automatically delete older trashed files in Google
+                        Drive without prompting user for confirmation
+  -v, --view            Only view which files are to be deleted without
+                        deleting them
+  -d #, --days #        Number of days files can remain in Google Drive trash
+                        before being deleted. Default is 30
+  -t SECS, --timeout SECS
+                        Specify timeout period in seconds. Default is 300
+  --logfile PATH        Path to log file. Default is no logs
+```

cleaner.py

@@ -45,7 +45,9 @@ class TimeoutError(Exception):
 
 class PageTokenFile:
     def __init__(self, filePath):
-        os.makedirs(os.path.dirname(filePath), exist_ok=True)
+        dir = os.path.dirname(filePath)
+        if dir.strip():
+            os.makedirs(dir, exist_ok=True)
         self.path = filePath
 
     def get(self):
@@ -129,7 +131,9 @@ def configure_logs(logPath):
     if not logPath:
         return logger
     logPath = logPath.strip('"')
-    os.makedirs(os.path.dirname(logPath), exist_ok=True)
+    dir = os.path.dirname(logPath)
+    if dir.strip():
+        os.makedirs(dir, exist_ok=True)
     open(logPath, 'a').close()
     fileHandler = logging.FileHandler(
         logPath, mode='a', encoding='utf-8')
@@ -151,7 +155,9 @@ def get_credentials(flags):
     Returns:
         Credentials, the obtained credential.
     """
-    os.makedirs(os.path.dirname(flags.credfile), exist_ok=True)
+    dir = os.path.dirname(flags.credfile)
+    if dir.strip():
+        os.makedirs(dir, exist_ok=True)
     store = Storage(flags.credfile)
     with warnings.catch_warnings():
         warnings.simplefilter("ignore")