handle format string exceptions separately

gallery_dl/util.py

@@ -183,10 +183,14 @@ class PathFormat():
 
     def set_directory(self, keywords):
         """Build directory path and create it if necessary"""
-        segments = [
-            text.clean_path(segment.format_map(keywords).strip())
-            for segment in self.directory_fmt
-        ]
+        try:
+            segments = [
+                text.clean_path(segment.format_map(keywords).strip())
+                for segment in self.directory_fmt
+            ]
+        except Exception as exc:
+            raise exception.FormatError(exc, "directory")
+
         self.directory = os.path.join(
             self.get_base_directory(),
             *segments
@@ -209,7 +213,12 @@ class PathFormat():
 
     def build_path(self, sep=os.path.sep):
         """Use filename-keywords and directory to build a full path"""
-        filename = text.clean_path(self.filename_fmt.format_map(self.keywords))
+        try:
+            filename = text.clean_path(
+                self.filename_fmt.format_map(self.keywords))
+        except Exception as exc:
+            raise exception.FormatError(exc, "filename")
+
         self.path = self.directory + sep + filename
         self.realpath = self.realdirectory + sep + filename