rebase: extract ctx description logic to a function The function will be used in a later patch. Differential Revision: https://phab.mercurial-scm.org/D22

python3: whitelist another *13* tests that now pass Differential Revision: https://phab.mercurial-scm.org/D302

py3: introduce a wrapper for __builtins__.{raw_,}input() In order to make this work, we have to wrap the io streams in a TextIOWrapper so that __builtins__.input() can do unicode IO on Python 3. We can't just restore the original (unicode) sys.std* because we might be running a cmdserver, and if we blindly restore sys.* to the original values then we end up breaking the cmdserver. Sadly, TextIOWrapper tries to close the underlying stream during its __del__, so we have to make a sublcass to prevent that. If you see errors like: TypeError: a bytes-like object is required, not 'str' On an input() or print() call on Python 3, the substitution of sys.std* is probably the root cause. A previous version of this change tried to put the bytesinput() method in pycompat - it turns out we need to do some encoding handling, so we have to be in a higher layer that's allowed to use mercurial.encoding.encoding. As a result, this is in util for now, with the TextIOWrapper subclass hiding in encoding.py. I'm not sure of a better place for the time being. Differential Revision: https://phab.mercurial-scm.org/D299

python3: whitelist four more passing tests Differential Revision: https://phab.mercurial-scm.org/D298

extensions: don't give AttributeError bytes message on Python 3 Differential Revision: https://phab.mercurial-scm.org/D353

extensions: if on py3 and propname is a bytestr, convert to sysstr Property names are unicodes on Python 3. Differential Revision: https://phab.mercurial-scm.org/D296