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

--- a/mercurial/encoding.py	Wed Jul 26 23:33:26 2017 -0400
+++ b/mercurial/encoding.py	Mon Jul 24 14:38:40 2017 -0400
@@ -8,6 +8,7 @@
 from __future__ import absolute_import
 
 import array
+import io
 import locale
 import os
 import unicodedata
@@ -573,3 +574,16 @@
             c = chr(ord(c.decode("utf-8")) & 0xff)
         r += c
     return r
+
+class strio(io.TextIOWrapper):
+    """Wrapper around TextIOWrapper that respects hg's encoding assumptions.
+
+    Also works around Python closing streams.
+    """
+
+    def __init__(self, buffer, **kwargs):
+        kwargs[r'encoding'] = _sysstr(encoding)
+        super(strio, self).__init__(buffer, **kwargs)
+
+    def __del__(self):
+        """Override __del__ so it doesn't close the underlying stream."""