Problem with xproto.OpenFont with Python 3

[flacjacket]

I got rid of the obvious Python 3 compatibility issues in qtile and tried running the test suite. It wound up failing, throwing the following exception a lot:

Traceback (most recent call last):
  File "/usr/lib64/python3.3/site-packages/nose/case.py", line 198, in runTest
    self.test(*self.arg)
  File "/home/sean/qtile/qtile/test/utils.py", line 95, in wrapped_fun
    return function(self)
  File "/home/sean/qtile/qtile/test/test_bar.py", line 272, in test_err
    self.qtileRaises(libqtile.confreader.ConfigError, ErrConf())
  File "/home/sean/qtile/qtile/test/utils.py", line 187, in qtileRaises
    config, self.display, self.fname)
  File "/usr/lib64/python3.3/unittest/case.py", line 570, in assertRaises
    return context.handle('assertRaises', callableObj, args, kwargs)
  File "/usr/lib64/python3.3/unittest/case.py", line 135, in handle
    callable_obj(*args, **kwargs)
  File "/home/sean/qtile/qtile/libqtile/manager.py", line 78, in __init__
    self.conn = xcbq.Connection(displayName)
  File "/home/sean/qtile/qtile/libqtile/xcbq.py", line 751, in __init__
    self.cursors = Cursors(self)
  File "/home/sean/qtile/qtile/libqtile/xcbq.py", line 925, in __init__
    self._new(name, cursor_font)
  File "/home/sean/qtile/qtile/libqtile/xcbq.py", line 929, in _new
    self.conn.conn.core.OpenFont(fid, len("cursor"), "cursor")
  File "/usr/lib64/python3.3/site-packages/xcffib-prerelease-py3.3-linux-x86_64.egg/xcffib/xproto.py", line 1587, in OpenFont
    buf.write(xcffib.pack_list(name, "c"))
  File "/usr/lib64/python3.3/site-packages/xcffib-prerelease-py3.3-linux-x86_64.egg/xcffib/__init__.py", line 517, in pack_list
    return struct.pack("=" + pack_type * len(from_), *tuple(from_))
struct.error: char format requires a bytes object of length 1

It looks like it is a problem with this, rather than a problem with qtile, I haven't had a chance to look into it, but I will try to figure out what is the problem.

[tych0]

Ah yes, another wonderful python3 bug. It also looks like at some point I also introduced an intermittent seg fault in the python 3 tests :-(

[tych0]

Also, thanks for looking into all this! If you want to add your python3 commits somewhere, you can make PRs to https://github.com/tych0/qtile/tree/cffi and I can merge them with the rest of the CFFI stuff once we go that route.

[flacjacket]

No problem! I'd looked into making qtile run on 3, but got snagged on stuff like xpyb, I owe a great thanks to xcffib for that. I'll push up my workings on a Python 3 with cffi qtile branch and open a PR against your branch.