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annotate roundup/i18n.py @ 6527:5ad7fb912227

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issue2551167 - update wheel support. New method for finding locale and template files when installed as a wheel. It acts more like existing code for egg support. Add build-arg source=local_pip for building using pip using the local files rather than downloading from pypi. Useful for testing these changes. Since it's developer testing code and still has the downside that man pages aren't accessible, I am not documenting it as an option.
author John Rouillard <rouilj@ieee.org>
date Sun, 07 Nov 2021 12:19:27 -0500
parents f961dbbc3573
children 01216187a167
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1 #
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2 # Copyright (c) 2001 Bizar Software Pty Ltd (http://www.bizarsoftware.com.au/)
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3 # This module is free software, and you may redistribute it and/or modify
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4 # under the same terms as Python, so long as this copyright message and
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5 # disclaimer are retained in their original form.
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6 #
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7 # IN NO EVENT SHALL BIZAR SOFTWARE PTY LTD BE LIABLE TO ANY PARTY FOR
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8 # DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING
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9 # OUT OF THE USE OF THIS CODE, EVEN IF THE AUTHOR HAS BEEN ADVISED OF THE
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10 # POSSIBILITY OF SUCH DAMAGE.
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11 #
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12 # BIZAR SOFTWARE PTY LTD SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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13 # BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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14 # FOR A PARTICULAR PURPOSE. THE CODE PROVIDED HEREUNDER IS ON AN "AS IS"
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15 # BASIS, AND THERE IS NO OBLIGATION WHATSOEVER TO PROVIDE MAINTENANCE,
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16 # SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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17 #
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18 """
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19 RoundUp Internationalization (I18N)
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20
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21 To use this module, the following code should be used::
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22
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23 from roundup.i18n import _
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24 ...
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25 print _("Some text that can be translated")
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26
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27 Note that to enable re-ordering of inserted texts in formatting strings
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28 (which can easily happen if a sentence has to be re-ordered due to
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29 grammatical changes), translatable formats should use named format specs::
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31 ... _('Index of %(classname)s') % {'classname': cn} ...
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32
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33 Also, this eases the job of translators since they have some context what
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34 the dynamic portion of a message really means.
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35 """
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36 __docformat__ = 'restructuredtext'
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37
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38 import gettext as gettext_module
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39 import os
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40
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41 from roundup import msgfmt
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42 from roundup.anypy.strings import is_us
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43
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44 # List of directories for mo file search (see SF bug 1219689)
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45 LOCALE_DIRS = [
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46 gettext_module._default_localedir,
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47 ]
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48 # compute mo location relative to roundup installation directory
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49 # (prefix/lib/python/site-packages/roundup/msgfmt.py on posix systems,
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50 # prefix/lib/site-packages/roundup/msgfmt.py on windows).
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51 # locale root is prefix/share/locale.
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52 if os.name == "nt":
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53 _mo_path = [".."] * 4 + ["share", "locale"]
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54 else:
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55 _mo_path = [".."] * 5 + ["share", "locale"]
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56 _mo_path = os.path.normpath(os.path.join(msgfmt.__file__, *_mo_path))
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57 if _mo_path not in LOCALE_DIRS:
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58 LOCALE_DIRS.append(_mo_path)
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59 del _mo_path
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60
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61 import sys
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62 # __file__ should be something like:
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63 # /usr/local/lib/python3.10/site-packages/roundup/i18n.py
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64 # os.prefix should be /usr, /usr/local or root of virtualenv
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65 # strip leading / to make os.path.join work right.
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66 path = __file__
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67 for N in 1, 2:
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68 path = os.path.dirname(path)
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69 # path is /usr/local/lib/python3.10/site-packages
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70 _ldir = os.path.join(path, sys.prefix[1:], 'share', 'locale')
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71 if os.path.isdir(_ldir):
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72 LOCALE_DIRS.append(_ldir)
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73 del _ldir
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74
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75 # Roundup text domain
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76 DOMAIN = "roundup"
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77
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78 RoundupNullTranslations = gettext_module.NullTranslations
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79 RoundupTranslations = gettext_module.GNUTranslations
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80
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81
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82 def find_locales(language=None):
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83 """Return normalized list of locale names to try for given language
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84
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85 Argument 'language' may be a single language code or a list of codes.
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86 If 'language' is omitted or None, use locale settings in OS environment.
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87
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88 """
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89 # body of this function is borrowed from gettext_module.find()
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90 if language is None:
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91 languages = []
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92 for envar in ('LANGUAGE', 'LC_ALL', 'LC_MESSAGES', 'LANG'):
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93 val = os.environ.get(envar)
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94 if val:
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95 languages = val.split(':')
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96 break
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97 elif is_us(language):
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98 languages = [language]
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99 else:
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100 # 'language' must be iterable
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101 languages = language
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102 # now normalize and expand the languages
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103 nelangs = []
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104 for lang in languages:
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105 for nelang in gettext_module._expand_lang(lang):
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106 if nelang not in nelangs:
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107 nelangs.append(nelang)
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108 return nelangs
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109
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110
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111 def get_mofile(languages, localedir, domain=None):
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112 """Return the first of .mo files found in localedir for languages
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113
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114 Parameters:
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115 languages:
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116 list of locale names to try
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117 localedir:
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118 path to directory containing locale files.
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119 Usually this is either gettext_module._default_localedir
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120 or 'locale' subdirectory in the tracker home.
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121 domain:
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122 optional name of messages domain.
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123 If omitted or None, work with simplified
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124 locale directory, as used in tracker homes:
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125 message catalogs are kept in files locale.po
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126 instead of locale/LC_MESSAGES/domain.po
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127
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128 Return the path of the first .mo file found.
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129 If nothing found, return None.
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130
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131 Automatically compile .po files if necessary.
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132
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133 """
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134 for locale in languages:
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135 if locale == "C":
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136 break
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137 if domain:
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138 basename = os.path.join(localedir, locale, "LC_MESSAGES", domain)
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139 else:
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140 basename = os.path.join(localedir, locale)
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141 # look for message catalog files, check timestamps
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142 mofile = basename + ".mo"
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143 if os.path.isfile(mofile):
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144 motime = os.path.getmtime(mofile)
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145 else:
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146 motime = 0
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147 pofile = basename + ".po"
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148 if os.path.isfile(pofile):
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149 potime = os.path.getmtime(pofile)
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150 else:
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151 potime = 0
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152 # see what we've found
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153 if motime < potime:
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154 # compile
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155 mo = msgfmt.Msgfmt(pofile).get()
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156 open(mofile, 'wb').write(mo)
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157 elif motime == 0:
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158 # no files found - proceed to the next locale name
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159 continue
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160 # .mo file found or made
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161 return mofile
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162 return None
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163
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164
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165 def get_translation(language=None, tracker_home=None,
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166 translation_class=RoundupTranslations,
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167 null_translation_class=RoundupNullTranslations):
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168 """Return Translation object for given language and domain
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169
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170 Argument 'language' may be a single language code or a list of codes.
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171 If 'language' is omitted or None, use locale settings in OS environment.
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172
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173 Arguments 'translation_class' and 'null_translation_class'
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174 specify the classes that are instantiated for existing
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175 and non-existing translations, respectively.
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176
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177 """
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178 mofiles = []
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179 # locale directory paths
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180 if tracker_home is None:
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181 tracker_locale = None
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182 else:
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183 tracker_locale = os.path.join(tracker_home, "locale")
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184 # get the list of locales
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185 locales = find_locales(language)
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186 # add mofiles found in the tracker, then in the system locale directory
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187 if tracker_locale:
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188 mofiles.append(get_mofile(locales, tracker_locale))
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189 for system_locale in LOCALE_DIRS:
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190 mofiles.append(get_mofile(locales, system_locale, DOMAIN))
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191 # we want to fall back to english unless english is selected language
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192 if "en" not in locales:
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193 locales = find_locales("en")
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194 # add mofiles found in the tracker, then in the system locale directory
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195 if tracker_locale:
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196 mofiles.append(get_mofile(locales, tracker_locale))
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197 for system_locale in LOCALE_DIRS:
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198 mofiles.append(get_mofile(locales, system_locale, DOMAIN))
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199 # filter out elements that are not found
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200 mofiles = filter(None, mofiles)
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201 translator = None
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202 for mofile in mofiles:
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203 try:
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204 mo = open(mofile, "rb")
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205 if translator is None:
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206 translator = translation_class(mo)
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207 else:
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208 # note: current implementation of gettext_module
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209 # always adds fallback to the end of the fallback chain.
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210 translator.add_fallback(translation_class(mo))
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211 mo.close()
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212 except IOError:
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213 # ignore unreadable .mo files
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214 pass
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215 if translator is None:
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216 translator = null_translation_class()
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217 return translator
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218
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219
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220 # static translations object
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221 translation = get_translation()
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222 # static translation functions
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223 _ = gettext = translation.gettext
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224 try:
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225 # Python 2.
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226 ugettext = translation.ugettext
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227 except AttributeError:
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228 # Python 3.
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229 ugettext = translation.gettext
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230 ngettext = translation.ngettext
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231 try:
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232 # Python 2.
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233 ungettext = translation.ungettext
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234 except AttributeError:
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235 # Python 3.
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236 ungettext = translation.ngettext
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237
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238 # vim: set filetype=python sts=4 sw=4 et si :
Roundup Issue Tracker: http://roundup-tracker.org/