[path] support multiple characters in path-restrict objects (#1707)

docs/configuration.rst

@@ -207,11 +207,12 @@ Default
     ``"auto"``
 Example
     * ``"/!? (){}"``
-    * ``{" ": "_", "/": "-", "|": "-", ":": "_-_", "*": "_+_"}``
+    * ``{"/": "_", "+": "_+_", "({[": "(", "]})": ")", "a-z": "*"}``
 Description
-    | A string of characters to be replaced with the value of
+    | A ``string`` of characters to be replaced with the value of
       `path-replace <extractor.*.path-replace_>`__
-    | or an object mapping invalid/unwanted characters to their replacements
+    | or an ``object`` mapping invalid/unwanted characters, character sets,
+      or character ranges to their replacements
     | for generated path segment names.
 
     Special values:

gallery_dl/path.py

@@ -134,11 +134,14 @@ class PathFormat():
             basedir = self.clean_path(basedir)
         self.basedirectory = basedir
 
-    @staticmethod
+    def _build_cleanfunc(self, chars, repl):
-    def _build_cleanfunc(chars, repl):
         if not chars:
             return util.identity
         elif isinstance(chars, dict):
+            if 0 not in chars:
+                chars = self._process_repl_dict(chars)
+                chars[0] = None
+
             def func(x, table=str.maketrans(chars)):
                 return x.translate(table)
         elif len(chars) == 1:
@@ -149,6 +152,20 @@ class PathFormat():
                 re.compile("[" + chars + "]").sub, repl)
         return func
 
+    def _process_repl_dict(self, chars):
+        # can't modify 'chars' while *directly* iterating over its keys
+        for char in [c for c in chars if len(c) > 1]:
+            if len(char) == 3 and char[1] == "-":
+                citer = range(ord(char[0]), ord(char[2])+1)
+            else:
+                citer = char
+
+            repl = chars.pop(char)
+            for c in citer:
+                chars[c] = repl
+
+        return chars
+
     def open(self, mode="wb"):
         """Open file and return a corresponding file object"""
         try: