annotate mercurial/i18n.py @ 45637:ad6ebb6f0dfe

copies: make two version of the changeset centric algorithm They are two main ways to run the changeset-centric copy-tracing algorithm. One fed from data stored in side-data and still in development, and one based on data stored in extra (with a "compatibility" mode). The `extra` based is used in production at Google, but still experimental in code. It is mostly unsuitable for other users because it affects the hash. The side-data based storage and algorithm have been evolving to store more data, cover more cases (mostly around merge, that Google do not really care about) and use lower level storage for efficiency. All this changes make is increasingly hard to maintain de common code base, without impacting code complexity and performance. For example, the compatibility mode requires to keep things at different level than what we need for side-data. So, I am duplicating the involved functions. The newly added `_extra` variants will be kept as today, while I will do some deeper rework of the side data versions. Long terms, the side-data version should be more featureful and performant than the extra based version, so I expect the duplicated `_extra` functions to eventually get dropped. Differential Revision: https://phab.mercurial-scm.org/D9114
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Fri, 25 Sep 2020 14:39:04 +0200
parents f0bee3b1b847
children b9f40b743627
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rev   line source
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1 # i18n.py - internationalization support for mercurial
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2 #
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3 # Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 from __future__ import absolute_import
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9
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10 import gettext as gettextmod
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11 import locale
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12 import os
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13 import sys
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14
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15 from .pycompat import getattr
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16 from .utils import resourceutil
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17 from . import (
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18 encoding,
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19 pycompat,
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20 )
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21
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22 # modelled after templater.templatepath:
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23 if getattr(sys, 'frozen', None) is not None:
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24 module = pycompat.sysexecutable
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25 else:
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26 module = pycompat.fsencode(__file__)
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27
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28 _languages = None
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29 if (
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30 pycompat.iswindows
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31 and b'LANGUAGE' not in encoding.environ
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32 and b'LC_ALL' not in encoding.environ
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33 and b'LC_MESSAGES' not in encoding.environ
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34 and b'LANG' not in encoding.environ
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35 ):
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36 # Try to detect UI language by "User Interface Language Management" API
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37 # if no locale variables are set. Note that locale.getdefaultlocale()
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38 # uses GetLocaleInfo(), which may be different from UI language.
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39 # (See http://msdn.microsoft.com/en-us/library/dd374098(v=VS.85).aspx )
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40 try:
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41 import ctypes
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42
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43 langid = ctypes.windll.kernel32.GetUserDefaultUILanguage()
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44 _languages = [locale.windows_locale[langid]]
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45 except (ImportError, AttributeError, KeyError):
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46 # ctypes not found or unknown langid
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47 pass
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48
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49
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50 datapath = pycompat.fsdecode(resourceutil.datapath)
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51 localedir = os.path.join(datapath, 'locale')
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52 t = gettextmod.translation('hg', localedir, _languages, fallback=True)
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53 try:
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54 _ugettext = t.ugettext
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55 except AttributeError:
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56 _ugettext = t.gettext
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57
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58
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59 _msgcache = {} # encoding: {message: translation}
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61
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62 def gettext(message):
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63 """Translate message.
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64
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65 The message is looked up in the catalog to get a Unicode string,
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66 which is encoded in the local encoding before being returned.
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67
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68 Important: message is restricted to characters in the encoding
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69 given by sys.getdefaultencoding() which is most likely 'ascii'.
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70 """
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71 # If message is None, t.ugettext will return u'None' as the
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72 # translation whereas our callers expect us to return None.
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73 if message is None or not _ugettext:
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74 return message
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75
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76 cache = _msgcache.setdefault(encoding.encoding, {})
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77 if message not in cache:
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78 if type(message) is pycompat.unicode:
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79 # goofy unicode docstrings in test
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80 paragraphs = message.split(u'\n\n')
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81 else:
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82 # should be ascii, but we have unicode docstrings in test, which
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83 # are converted to utf-8 bytes on Python 3.
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84 paragraphs = [p.decode("utf-8") for p in message.split(b'\n\n')]
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85 # Be careful not to translate the empty string -- it holds the
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86 # meta data of the .po file.
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87 u = u'\n\n'.join([p and _ugettext(p) or u'' for p in paragraphs])
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88 try:
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89 # encoding.tolocal cannot be used since it will first try to
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90 # decode the Unicode string. Calling u.decode(enc) really
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91 # means u.encode(sys.getdefaultencoding()).decode(enc). Since
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92 # the Python encoding defaults to 'ascii', this fails if the
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93 # translated string use non-ASCII characters.
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94 encodingstr = pycompat.sysstr(encoding.encoding)
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95 cache[message] = u.encode(encodingstr, "replace")
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96 except LookupError:
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97 # An unknown encoding results in a LookupError.
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98 cache[message] = message
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99 return cache[message]
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100
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101
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102 def _plain():
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103 if (
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104 b'HGPLAIN' not in encoding.environ
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105 and b'HGPLAINEXCEPT' not in encoding.environ
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106 ):
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107 return False
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108 exceptions = encoding.environ.get(b'HGPLAINEXCEPT', b'').strip().split(b',')
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109 return b'i18n' not in exceptions
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110
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111
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112 if _plain():
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113 _ = lambda message: message
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114 else:
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115 _ = gettext