[issue2926] Incorrect encoding used to print on windows console

[Andrei Polushin]

New submission from Andrei Polushin <polushin at gmail.com>:

On Windows console, internationalized messages are always output in Windows
ANSI encoding, while the console uses OEM encoding by default. Thus the
messages are unreadable.

E.g. in Russian translation, the default encoding is cp866, while the
messages are printed in cp1251. The workaround is to issue `chcp 1251` shell
command before running any hg commands. Using the workaround is inconvenient
and not always possible.

More info and suggestions:
1. When running in console mode, sys.stdout.encoding is correctly
initialized by Python to an actual encoding the console is using. Python
uses GetConsoleOutputCP API to detect this. However, sys.stdout.encoding is
totally ignored by Mercurial.
2. When running in piped mode (redirected to file etc.), sys.stdout.encoding
is None. In this case, I suggest to use UTF-8 encoding.

----------
messages: 16982
nosy: polushin
priority: bug
status: unread
title: Incorrect encoding used to print on windows console
topic: windows

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