TLE files with names like "tle-yyyymmddHHMM" does not work

Testing with tle files following the naming pattern tle-yyyymmddHHMM doesn't seem to work. Maybe untested. Had to introduce a try-except around the part where the regex pattern is tested.

I suggest using trollsift exclusively and use the config file to specify the file patters that shall be supported.

Code is overly complicated in my opinion as it is.

