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annotate roundup/i18n.py @ 7698:4e37a7833708

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doc: add FTS5 requirement for sqlite backend. Document the requirement for FTS5 if you are using the sqlite backend. Tonu Mikk reported issues with using a SQLite that was missing FTS5 support (RedHat 7 sqlite with python 3.6). Even though FTS5 has been in the sqlite amalgamation since 2015-10-14 (v3.9.0) RedHat chose to not build their package with that. This leads to a traceback when initializing the database.
author John Rouillard <rouilj@ieee.org>
date Sat, 11 Nov 2023 19:39:57 -0500
parents 1471fcda252b
children a46675399a05
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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 import sys
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41
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42 from roundup import msgfmt
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43 from roundup.anypy.strings import is_us
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44
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45 # List of directories for mo file search (see SF bug 1219689)
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46 LOCALE_DIRS = [
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47 gettext_module._default_localedir,
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48 ]
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49 # compute mo location relative to roundup installation directory
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50 # (prefix/lib/python/site-packages/roundup/msgfmt.py on posix systems,
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51 # prefix/lib/site-packages/roundup/msgfmt.py on windows).
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52 # locale root is prefix/share/locale.
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53 if os.name == "nt":
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54 _mo_path = [".."] * 4 + ["share", "locale"]
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55 root_prefix_chars = 3 # remove c:\ or other drive letter
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56 else:
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57 _mo_path = [".."] * 5 + ["share", "locale"]
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58 root_prefix_chars = 1 # remove /
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59
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60 _mo_path = os.path.normpath(os.path.join(msgfmt.__file__, *_mo_path))
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61 if _mo_path not in LOCALE_DIRS:
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62 LOCALE_DIRS.append(_mo_path)
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63 del _mo_path
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64
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65 # __file__ should be something like:
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66 # /usr/local/lib/python3.10/site-packages/roundup/i18n.py
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67 # os.prefix should be /usr, /usr/local or root of virtualenv
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68 # strip leading / to make os.path.join work right.
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69 path = __file__
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70 for _N in 1, 2:
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71 path = os.path.dirname(path)
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72 # path is /usr/local/lib/python3.10/site-packages
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73 _ldir = os.path.join(path, sys.prefix[root_prefix_chars:], 'share', 'locale')
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74 if os.path.isdir(_ldir):
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75 LOCALE_DIRS.append(_ldir)
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76 # try other places locale files are hidden on install
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77 _ldir = os.path.join(path, sys.prefix[root_prefix_chars:], 'local', 'share', 'locale')
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78 if os.path.isdir(_ldir):
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79 LOCALE_DIRS.append(_ldir)
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80 try:
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81 _ldir = os.path.join(path, sys.base_prefix[root_prefix_chars:], 'local', 'share', 'locale')
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82 if os.path.isdir(_ldir):
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83 LOCALE_DIRS.append(_ldir)
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84 _ldir = os.path.join(path, sys.base_prefix[root_prefix_chars:], 'share', 'locale')
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85 if os.path.isdir(_ldir):
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86 LOCALE_DIRS.append(_ldir)
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87 except AttributeError:
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88 pass # no base_prefix on 2.7
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89 del _ldir
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90
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91 # Roundup text domain
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92 DOMAIN = "roundup"
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93
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94 RoundupNullTranslations = gettext_module.NullTranslations
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95 RoundupTranslations = gettext_module.GNUTranslations
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97
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98 def find_locales(language=None):
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99 """Return normalized list of locale names to try for given language
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100
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101 Argument 'language' may be a single language code or a list of codes.
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102 If 'language' is omitted or None, use locale settings in OS environment.
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103
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104 """
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105 # body of this function is borrowed from gettext_module.find()
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106 if language is None:
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107 languages = []
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108 for envar in ('LANGUAGE', 'LC_ALL', 'LC_MESSAGES', 'LANG'):
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109 val = os.environ.get(envar)
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110 if val:
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111 languages = val.split(':')
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112 break
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113 elif is_us(language):
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114 languages = [language]
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115 else:
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116 # 'language' must be iterable
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117 languages = language
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118 # now normalize and expand the languages
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119 nelangs = []
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120 for lang in languages:
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121 for nelang in gettext_module._expand_lang(lang):
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122 if nelang not in nelangs:
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123 nelangs.append(nelang)
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124 return nelangs
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125
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126
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127 def get_mofile(languages, localedir, domain=None):
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128 """Return the first of .mo files found in localedir for languages
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129
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130 Parameters:
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131 languages:
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132 list of locale names to try
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133 localedir:
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134 path to directory containing locale files.
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135 Usually this is either gettext_module._default_localedir
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136 or 'locale' subdirectory in the tracker home.
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137 domain:
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138 optional name of messages domain.
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139 If omitted or None, work with simplified
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140 locale directory, as used in tracker homes:
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141 message catalogs are kept in files locale.po
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142 instead of locale/LC_MESSAGES/domain.po
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143
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144 Return the path of the first .mo file found.
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145 If nothing found, return None.
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146
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147 Automatically compile .po files if necessary.
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148
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149 """
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150 for locale in languages:
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151 if locale == "C":
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152 break
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153 if domain:
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154 basename = os.path.join(localedir, locale, "LC_MESSAGES", domain)
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155 else:
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156 basename = os.path.join(localedir, locale)
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157 # look for message catalog files, check timestamps
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158 mofile = basename + ".mo"
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159 if os.path.isfile(mofile):
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160 motime = os.path.getmtime(mofile)
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161 else:
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162 motime = 0
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163 pofile = basename + ".po"
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164 if os.path.isfile(pofile):
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165 potime = os.path.getmtime(pofile)
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166 else:
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167 potime = 0
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168 # see what we've found
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169 if motime < potime:
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170 # compile
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171 mo = msgfmt.Msgfmt(pofile).get()
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172 open(mofile, 'wb').write(mo)
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173 elif motime == 0:
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174 # no files found - proceed to the next locale name
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175 continue
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176 # .mo file found or made
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177 return mofile
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178 return None
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179
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180
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181 def get_translation(language=None, tracker_home=None,
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182 translation_class=RoundupTranslations,
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183 null_translation_class=RoundupNullTranslations):
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184 """Return Translation object for given language and domain
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185
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186 Argument 'language' may be a single language code or a list of codes.
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187 If 'language' is omitted or None, use locale settings in OS environment.
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188
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189 Arguments 'translation_class' and 'null_translation_class'
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190 specify the classes that are instantiated for existing
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191 and non-existing translations, respectively.
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192
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193 """
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194 mofiles = []
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195 # locale directory paths
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196 if tracker_home is None:
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197 tracker_locale = None
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198 else:
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199 tracker_locale = os.path.join(tracker_home, "locale")
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200 # get the list of locales
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201 locales = find_locales(language)
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202 # add mofiles found in the tracker, then in the system locale directory
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203 if tracker_locale:
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204 mofiles.append(get_mofile(locales, tracker_locale))
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205 for system_locale in LOCALE_DIRS:
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206 mofiles.append(get_mofile(locales, system_locale, DOMAIN))
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207 # we want to fall back to english unless english is selected language
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208 if "en" not in locales:
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209 locales = find_locales("en")
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210 # add mofiles found in the tracker, then in the system locale directory
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211 if tracker_locale:
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212 mofiles.append(get_mofile(locales, tracker_locale))
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213 for system_locale in LOCALE_DIRS:
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214 mofiles.append(get_mofile(locales, system_locale, DOMAIN))
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215 # filter out elements that are not found
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216 mofiles = filter(None, mofiles)
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217 translator = None
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218 for mofile in mofiles:
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219 try:
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220 mo = open(mofile, "rb")
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221 if translator is None:
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222 translator = translation_class(mo)
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223 # the .mo file this translator loaded from
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224 translator._file = mofile
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225 else:
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226 # note: current implementation of gettext_module
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227 # always adds fallback to the end of the fallback chain.
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228 fallback = translation_class(mo)
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229 fallback._file = mofile
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230 translator.add_fallback(fallback)
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231 mo.close()
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232 except IOError:
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233 # ignore unreadable .mo files
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234 pass
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235 if translator is None:
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236 translator = null_translation_class()
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237 return translator
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238
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239
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240 # static translations object
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241 translation = get_translation()
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242 # static translation functions
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243 _ = gettext = translation.gettext
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244 try:
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245 # Python 2.
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246 ugettext = translation.ugettext
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247 except AttributeError:
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248 # Python 3.
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249 ugettext = translation.gettext
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250 ngettext = translation.ngettext
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251 try:
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252 # Python 2.
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253 ungettext = translation.ungettext
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254 except AttributeError:
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255 # Python 3.
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256 ungettext = translation.ngettext
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257
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Roundup Issue Tracker: http://roundup-tracker.org/