refactor 'path-restrict' parsing

gallery_dl/util.py

@@ -726,6 +726,11 @@ class PathFormat():
         "jif" : "jpg",
         "jfi" : "jpg",
     }
+    RESTRICT_MAP = {
+        "auto"   : "\\\\|/<>:\"?*" if WINDOWS else "/",
+        "unix"   : "/",
+        "windows": "\\\\|/<>:\"?*",
+    }
 
     def __init__(self, extractor):
         filename_fmt = extractor.config("filename", extractor.filename_fmt)
@@ -769,13 +774,7 @@ class PathFormat():
 
         restrict = extractor.config("path-restrict", "auto")
         replace = extractor.config("path-replace", "_")
-
-        if restrict == "auto":
-            restrict = "\\\\|/<>:\"?*" if WINDOWS else "/"
-        elif restrict == "unix":
-            restrict = "/"
-        elif restrict == "windows":
-            restrict = "\\\\|/<>:\"?*"
+        restrict = self.RESTRICT_MAP.get(restrict, restrict)
         self.clean_segment = self._build_cleanfunc(restrict, replace)
 
         remove = extractor.config("path-remove", "\x00-\x1f\x7f")