Sun, 20 Jul 2008 21:39:39 -0400
Move more common extraction/listing functionality into BaseExtractor.
I noticed that a lot of the extract_archive/get_filenames implementations
were the same two lines of code: a pipe and a run_pipes. Short as it is,
there's no reason to keep repeating that two-line incantation, so I moved
this basic pattern into BaseExtractor.