owfile: support readers with repeated extensions

Author: markotoplak

Orange/widgets/data/owfile.py

@@ -268,7 +268,9 @@ def browse_file(self, in_demos=False):
         else:
             start_file = self.last_path() or os.path.expanduser("~/")
 
-        filename, reader, _ = get_file_name_open(start_file, None, FileFormat.readers)
+        readers = [f for f in FileFormat.formats
+                   if getattr(f, 'read', None) and getattr(f, "EXTENSIONS", None)]
+        filename, reader, _ = get_file_name_open(start_file, None, readers)
         if not filename:
             return
         self.add_path(filename)

Orange/widgets/utils/filedialogs.py

@@ -112,13 +112,13 @@ def get_file_name_open(start_dir, start_filter, file_formats, title="Open...",
     Args:
         start_dir (str): initial directory, optionally including the filename
         start_filter (str): initial filter
-        file_formats (dict {extension: Orange.data.io.FileFormat}): file formats
+        file_formats (a list of Orange.data.io.FileFormat): file formats
         title (str): title of the dialog
         dialog: a function that creates a QT dialog
     Returns:
         (filename, filter, file_format), or `(None, None, None)` on cancel
     """
-    file_formats = sorted(set(file_formats.values()), key=lambda w: w.PRIORITY)
+    file_formats = sorted(set(file_formats), key=lambda w: (w.PRIORITY, w.DESCRIPTION))
     filters = [format_filter(f) for f in file_formats]
 
     # add all readable files option