mercurial/i18n.py
author Yuya Nishihara <yuya@tcha.org>
Sun, 02 Nov 2014 13:20:07 +0900
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# i18n.py - internationalization support for mercurial
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#
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# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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import encoding
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import gettext as gettextmod, sys, os, locale
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# modelled after templater.templatepath:
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if getattr(sys, 'frozen', None) is not None:
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    module = sys.executable
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else:
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    module = __file__
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_languages = None
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if (os.name == 'nt'
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    and 'LANGUAGE' not in os.environ
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    and 'LC_ALL' not in os.environ
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    and 'LC_MESSAGES' not in os.environ
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    and 'LANG' not in os.environ):
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    # Try to detect UI language by "User Interface Language Management" API
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    # if no locale variables are set. Note that locale.getdefaultlocale()
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    # uses GetLocaleInfo(), which may be different from UI language.
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    # (See http://msdn.microsoft.com/en-us/library/dd374098(v=VS.85).aspx )
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    try:
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        import ctypes
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        langid = ctypes.windll.kernel32.GetUserDefaultUILanguage()
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        _languages = [locale.windows_locale[langid]]
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    except (ImportError, AttributeError, KeyError):
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        # ctypes not found or unknown langid
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        pass
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_ugettext = None
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def setdatapath(datapath):
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    localedir = os.path.join(datapath, 'locale')
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    t = gettextmod.translation('hg', localedir, _languages, fallback=True)
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    global _ugettext
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    _ugettext = t.ugettext
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_msgcache = {}
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def gettext(message):
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    """Translate message.
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    The message is looked up in the catalog to get a Unicode string,
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    which is encoded in the local encoding before being returned.
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    Important: message is restricted to characters in the encoding
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    given by sys.getdefaultencoding() which is most likely 'ascii'.
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    """
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    # If message is None, t.ugettext will return u'None' as the
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    # translation whereas our callers expect us to return None.
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    if message is None or not _ugettext:
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        return message
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    if message not in _msgcache:
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        if type(message) is unicode:
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            # goofy unicode docstrings in test
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            paragraphs = message.split(u'\n\n')
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        else:
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            paragraphs = [p.decode("ascii") for p in message.split('\n\n')]
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        # Be careful not to translate the empty string -- it holds the
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        # meta data of the .po file.
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        u = u'\n\n'.join([p and _ugettext(p) or '' for p in paragraphs])
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        try:
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            # encoding.tolocal cannot be used since it will first try to
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            # decode the Unicode string. Calling u.decode(enc) really
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            # means u.encode(sys.getdefaultencoding()).decode(enc). Since
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            # the Python encoding defaults to 'ascii', this fails if the
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            # translated string use non-ASCII characters.
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            _msgcache[message] = u.encode(encoding.encoding, "replace")
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        except LookupError:
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            # An unknown encoding results in a LookupError.
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            _msgcache[message] = message
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    return _msgcache[message]
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def _plain():
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    if 'HGPLAIN' not in os.environ and 'HGPLAINEXCEPT' not in os.environ:
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        return False
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    exceptions = os.environ.get('HGPLAINEXCEPT', '').strip().split(',')
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    return 'i18n' not in exceptions
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if _plain():
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    _ = lambda message: message
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else:
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    _ = gettext