Add command-line option to wipe any paths

Idea thanks to Thomas https://askubuntu.com/questions/1111358/bleach-bit-how-to-wipe-free-space-via-command-line

bleachbit/CLI.py

@@ -162,6 +162,8 @@ def process_cmd_line():
     if 'nt' == os.name:
         parser.add_option("--update-winapp2", action="store_true",
                           help=_("update winapp2.ini, if a new version is available"))
+    parser.add_option("-w", "--wipe-free-space", action="store_true",
+                      help=_("wipe free space in the given paths"))
     parser.add_option("-v", "--version", action="store_true",
                       help=_("output version information and exit"))
     parser.add_option('-o', '--overwrite', action='store_true',
@@ -195,6 +197,22 @@ def process_cmd_line():
         from bleachbit.CleanerML import create_pot
         create_pot()
         sys.exit(0)
+    if options.wipe_free_space:
+        if len(args) < 1:
+            logger.error('No directories given for --wipe-free-space')
+            sys.exit(1)
+        for wipe_path in args:
+            if not os.path.isdir(wipe_path):
+                logger.error(
+                    'Path to wipe must be an existing directory: %s', wipe_path)
+                sys.exit(1)
+        logger.info('Wiping free space can take a long time.')
+        for wipe_path in args:
+            logger.info('Wiping free space in path: %s', wipe_path)
+            import bleachbit.FileUtilities
+            for ret in bleachbit.FileUtilities.wipe_path(wipe_path):
+                pass
+        sys.exit(0)
     if options.preview or options.clean:
         operations = args_to_operations(args, options.preset)
         if not operations: