When a pattern is not passed to flake8 (--filename), look for all files
that end with .py as well as extension-less files that start with a
Python shebang. Helps project lint scripts that may not have an
extension.
Fixes#409
In some cases, when we handle SyntaxErrors we need to ensure that the
column number is correct for a 1-indexed report. In some cases, we also
need to account for the fact that the SyntaxError has happened "after" a
new-line. To extract and alter the row and column numbers, we've moved
the logic to a private static method on the FileChecker object to avoid
an overly complex method.
Closes#237
This adds E501 which is actually a poor test. Currently,
pep8.maximum_line_length does its own check for noqa instead of relying
on the Checker. See also: https://github.com/PyCQA/pycodestyle/pull/539
