Support stdin

[beck]

flake8-isort blew up my IDE because it did not support stdin.

To duplicate:

$ pip install flake8-isort
$ touch test.py
$ flake8 '-' < test.py
...
IOError: [Errno 2] No such file or directory: '/Users/doug/Projects/flake8-isort/stdin'

These changes ensure flake8 will not blowup.

But I noticed that flake8 checkers fail when contents are piped in:

$ echo "print 'hello world'" > test.py
$ flake8 '-' < test.py
Flake8Isort: stdin is empty

This is an issue upstream and am unsure the best way to fix. I opened:
PyCQA/pycodestyle#443

Also added:

• silenced output from isort
• provided a slightly better line number

[gforcada]

First of all thanks for the pull request!

Would you mind to change the context manager for testfixtures.OutputCapture? You can see it in action on run_test.py. This will kill some lines.

[gforcada]

I would rather prefer to have something like:
self.content = Read(tree, filename)

and returns the expected value, i.e. hiding the complexity inside Read instead of having it on Flake8Isort.

[gforcada]

@beck ping :-)

[gforcada]

@beck friendly ping :-)

[gforcada]

Fixed on #7 by @mjacksonw and released by yours truly as 1.2. Enjoy!

[beck]

👍