[options] add '--restrict-filenames' & '--windows-filenames'

docs/options.md

@@ -24,6 +24,10 @@
                                 ('/O' for "original" filenames)
     -d, --destination PATH      Target location for file downloads
     -D, --directory PATH        Exact location for file downloads
+    --restrict-filenames VALUE  Replace restricted filename characters with
+                                underscores. One of 'windows', 'unix', 'ascii',
+                                'ascii+', or a custom set of characters
+    --windows-filenames         Force filenames to be Windows-compatible
     -X, --extractors PATH       Load external extractors from PATH
     --clear-cache MODULE        Delete cached login sessions, cookies, etc. for
                                 MODULE (ALL to delete everything)

gallery_dl/option.py

@@ -268,6 +268,19 @@ def build_parser():
         dest="directory", metavar="PATH",
         help="Exact location for file downloads",
     )
+    general.add_argument(
+        "--restrict-filenames",
+        dest="path-restrict", metavar="VALUE", action=ConfigAction,
+        help=("Replace restricted filename characters with underscores. "
+              "One of 'windows', 'unix', 'ascii', 'ascii+', "
+              "or a custom set of characters"),
+    )
+    general.add_argument(
+        "--windows-filenames",
+        dest="path-restrict", nargs=0, action=ConfigConstAction,
+        const="windows",
+        help="Force filenames to be Windows-compatible",
+    )
     general.add_argument(
         "-X", "--extractors",
         dest="extractor_sources", metavar="PATH", action="append",