pecan/pecan — pull request #29 by alfredodeza (2011-11-17 17:22:04+00:00)
Title: handle no arguments or non-file/non-existent filenames

When using `pecan serve` we should be able to handle nicely
when no options or bad filenames are given to avoid seeing a
not so helpful traceback.

this adds a helper method that verifies arguments and valid file arguments