Mercurial > p > roundup > code
annotate doc/developers.txt @ 2605:6e9bd67fefa9
complete transition from HYPERDBDEBUG to new logging
| author | Richard Jones <richard@users.sourceforge.net> |
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| date | Wed, 21 Jul 2004 00:50:50 +0000 |
| parents | 096063697f77 |
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1 ================== |
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2 Developing Roundup |
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3 ================== |
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4 |
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5 :Version: $Revision: 1.12 $ |
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6 |
| 2409 | 7 .. note:: |
| 8 The intended audience of this document is the developers of the core | |
| 9 Roundup code. If you just wish to alter some behaviour of your Roundup | |
| 10 installation, see `customising roundup`_. | |
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11 |
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12 .. contents:: |
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13 |
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14 Getting Started |
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15 --------------- |
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16 |
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17 Anyone wishing to help in the development of Roundup must read `Roundup's |
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18 Design Document`_ and the `implementation notes`_. |
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19 |
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20 All development is coordinated through two resources: |
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21 |
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22 - roundup-dev mailing list at |
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23 http://lists.sourceforge.net/mailman/listinfo/roundup-devel |
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24 - Sourceforge's issue trackers at |
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25 https://sourceforge.net/tracker/?group_id=31577 |
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26 |
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27 Small Changes |
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28 ------------- |
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29 |
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30 Most small changes can be submitted through the Feature tracker, with patches |
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31 attached that give context diffs of the affected source. |
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32 |
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33 |
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34 CVS Access |
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35 ---------- |
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36 |
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37 To get CVS access, contact richard@users.sourceforge.net. |
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38 |
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39 CVS stuff: |
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40 |
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41 1. to tag a release (eg. the pre-release of 0.5.0):: |
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42 |
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43 cvs tag release-0-5-0-pr1 |
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44 |
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45 1. to make a branch (eg. branching for code freeze/release):: |
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46 |
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47 cvs co -d maint-0-5 -r release-0-5-0-pr1 roundup |
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48 cd maint-0-5 |
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49 cvs tag -b maint-0-5 |
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50 |
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51 2. to check out a branch (eg. the maintenance branch for 0.5.x):: |
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52 |
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53 cvs co -d maint-0-5 -r maint-0-5 |
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54 |
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55 3. to merge changes from the maintenance branch to the trunk, in the |
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56 directory containing the HEAD checkout:: |
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57 |
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58 cvs up -j maint-0-5 |
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59 |
| 1247 | 60 though this is highly discouraged, as it generally creates a whole swag |
| 61 of conflicts :( | |
| 62 | |
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63 Standard tag names: |
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64 |
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65 *release-maj-min-patch[-sub]* |
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66 Release of the major.minor.patch release, possibly a beta or pre-release, |
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67 in which case *sub* will be one of "b*N*" or "pr*N*". |
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68 *maint-maj-min* |
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69 Maintenance branch for the major.minor release. Patch releases are tagged in |
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70 this branch. |
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71 |
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72 Typically, release happen like this: |
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73 |
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74 1. work progresses in the HEAD branch until milestones are met, |
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75 2. a series of beta releases are tagged in the HEAD until the code is |
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76 stable enough to freeze, |
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77 3. the pre-release is tagged in the HEAD, with the resultant code branched |
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78 to the maintenance branch for that release, |
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79 4. bugs in the release are patched in the maintenance branch, and the final |
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80 and patch releases are tagged there, and |
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81 5. further major work happens in the HEAD. |
| 935 | 82 |
| 83 Project Rules | |
| 84 ------------- | |
| 85 | |
| 86 Mostly the project follows Guido's Style (though naming tends to be a little | |
| 87 relaxed sometimes). In short: | |
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88 |
| 935 | 89 - 80 column width code |
| 90 - 4-space indentations | |
| 2301 | 91 - All modules must have a CVS Id line near the top |
| 935 | 92 |
| 93 Other project rules: | |
| 94 | |
| 95 - New functionality must be documented, even briefly (so at least we know | |
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96 where there's missing documentation) and changes to tracker configuration |
| 935 | 97 must be logged in the upgrading document. |
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98 - subscribe to roundup-checkins to receive checkin notifications from the |
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99 other developers with CVS access |
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100 - discuss any changes with the other developers on roundup-dev. If nothing |
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101 else, this makes sure there's no rude shocks |
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102 - write unit tests for changes you make (where possible), and ensure that |
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103 all unit tests run before committing changes |
| 935 | 104 - run pychecker over changed code |
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105 |
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106 The administrators of the project reserve the right to boot developers who |
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107 consistently check in code which is either broken or takes the codebase in |
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108 directions that have not been agreed to. |
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109 |
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110 |
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111 Debugging Aids |
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112 -------------- |
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113 |
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114 Try turning on logging of DEBUG level messages. This may be done a number |
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115 of ways, depending on what it is you're testing: |
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116 |
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117 1. If you're testing the database unit tests, then set the environment |
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118 variable ``LOGGING_LEVEL=DEBUG``. This may be done like so: |
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119 |
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120 LOGGING_LEVEL=DEBUG python run_tests.py |
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121 |
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122 This variable replaces the older HYPERDBDEBUG environment var. |
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123 |
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124 2. If you're testing a particular tracker, then set the logging level in |
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125 your tracker's ``config.py``. |
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126 |
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127 |
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128 Internationalization Notes |
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129 -------------------------- |
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130 |
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131 How stuff works: |
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132 |
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133 1. Strings that may require translation (messages in human language) |
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134 are marked in the source code. This step is discussed in |
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135 `Marking Strings for Translation`_ section. |
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136 |
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137 2. These strings are all extracted into Message Template File |
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138 ``locale/roundup.pot`` (_`POT` file). See `Extracting Translatable |
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139 Messages`_ below. |
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140 |
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141 3. Language teams use POT file to make Message Files for national |
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142 languages (_`PO` files). All PO files for Roundup are kept in |
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143 the ``locale`` directory. Names of these files are target |
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144 locale names, usually just 2-letter language codes. `Translating |
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145 Messages`_ section of this chapter gives useful hints for |
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146 message translators. |
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147 |
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148 4. Translated Message Files are compiled into binary form (_`MO` files) |
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149 and stored in ``locale`` directory (but not kept in the `Roundup |
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150 CVS`_ repository, as they may be easily made from PO files). |
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151 See `Compiling Message Catalogs`_ section. |
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152 |
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153 5. Roundup installer creates runtime locale structure on the file |
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154 system, putting MO files in their appropriate places. |
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155 |
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156 6. Runtime internationalization (_`I18N`) services use these MO files |
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157 to translate program messages into language selected by current |
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158 Roundup user. Roundup command line interface uses locale name |
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159 set in OS environment variable ``LANGUAGE``, ``LC_ALL``, |
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160 ``LC_MESSAGES``, or ``LANG`` (in that order). Roundup Web User |
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161 Interface uses language selected by currently authenticated user. |
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162 |
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163 Additional details may be found in `GNU gettext`_ and Python `gettext |
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164 module`_ documentation. |
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165 |
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166 `Roundup source distribution`_ includes POT and PO files for message |
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167 translators, and also pre-built MO files to facilitate installations |
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168 from source. Roundup binary distribution includes MO files only. |
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169 |
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170 .. _GNU gettext: |
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171 |
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172 GNU gettext package |
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173 ^^^^^^^^^^^^^^^^^^^ |
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174 |
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175 This chapter is full of references to GNU `gettext package`_. |
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176 GNU gettext is a "must have" for nearly all steps of internationalizing |
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177 any program, and it's manual is definetely a recommended reading |
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178 for people involved in `I18N`_. |
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179 |
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180 There are GNU gettext ports to all major OS platforms. |
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181 Windows binaries are available from `GNU mirror sites`_. |
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182 |
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183 Roundup does not use GNU gettext at runtime, but it's tools |
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184 are used for `extracting translatable messages`_, `compiling |
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185 message catalogs`_ and, optionally, for `translating messages`_. |
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186 |
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187 Note that ``gettext`` package in some OS distributions means just |
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188 runtime tools and libraries. In such cases gettext development tools |
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189 are usually distributed in separate package named ``gettext-devel``. |
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190 |
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191 Marking Strings for Translation |
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192 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |
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193 |
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194 Strings that need translation must be marked in the source code. |
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195 Following subsections explain how this is done in different cases. |
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196 |
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197 If translatable string is used as a format string, it is recommended |
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198 to always use *named* format specifiers:: |
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199 |
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200 _('Index of %(classname)s') % locals() |
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201 |
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202 This helps translators to better understand the context of the |
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203 message and, in Python, remove format specifier altogether (which |
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204 is sometimes useful, especially in singular cases of `Plural Forms`_). |
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205 |
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206 When there is more than one format specifier in the translatable |
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207 format string, named format specifiers *must* be used almost always, |
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208 because translation may require different order of items. |
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209 |
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210 It is better to *not* mark for translation strings that are not |
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211 locale-dependent, as this makes it more difficult to keep track |
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212 of translation completeness. For example, string ``</ol></body></html>`` |
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213 (in ``index()`` method of the request handler in ``roundup_server`` |
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214 script) has no human readable parts at all, and needs no translations. |
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215 Such strings are left untranslated in PO files, and are reported |
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216 as such by PO status checkers (e.g. ``msgfmt --statistics``). |
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217 |
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218 Need some note about i18n in TAL here... this link has good info: |
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219 |
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220 http://plone.org/documentation/howto/I18nForDevelopers |
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221 |
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222 |
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223 Command Line Interfaces |
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224 ~~~~~~~~~~~~~~~~~~~~~~~ |
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225 |
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226 Scripts and routines run from the command line use "static" language |
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227 defined by environment variables recognized by ``gettext`` module |
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228 from Python library (``LANGUAGE``, ``LC_ALL``, ``LC_MESSAGES``, and |
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229 ``LANG``). Primarilly, these are ``roundup-admin`` script and |
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230 ``admin.py`` module, but also help texts and startup error messages |
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231 in other scripts and their supporting modules. |
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232 |
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233 For these interfaces, Python ``gettext`` engine must be initialized |
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234 to use Roundup message catalogs. This is normally done by including |
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235 the following line in the module imports:: |
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236 |
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237 from i18n import _, ngettext |
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238 |
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239 Simple translations are automatically marked by calls to builtin |
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240 message translation function ``_()``:: |
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241 |
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242 print _("This message is translated") |
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243 |
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244 Translations for messages whose grammatical depends on a number |
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245 must be done by ``ngettext()`` function:: |
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246 |
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247 print ngettext("Nuked %i file", "Nuked %i files", number_of_files_nuked) |
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248 |
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249 User Interfaces |
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250 ~~~~~~~~~~~~~~~ |
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251 |
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252 *(not yet)* |
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253 |
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254 This includes Mail Gateway and Web User Interfaces, where translation |
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255 depends on the language of current Roundup User. These translations |
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256 will be done by the tracker configuration object. Translatable strings |
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257 will be automatically marked by calls to the ``_()`` and ``ngettext()`` |
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258 methods of that object:: |
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259 |
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260 self.config._("This message is translated") |
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261 self.config.ngettext("Nuked %i file", "Nuked %i files", |
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262 number_of_files_nuked) |
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263 |
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264 Deferred Translations |
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265 ~~~~~~~~~~~~~~~~~~~~~ |
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266 |
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267 Sometimes translatable strings appear in the source code in untranslated |
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268 form [#note_admin.py]_ and must be translated elsewhere. |
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269 Example:: |
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270 |
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271 for meal in ("spam", "egg", "beacon"): |
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272 print _(meal) |
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273 |
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274 In such cases, strings must be marked for translation without actual |
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275 call to the translating function. To mark these strings, we use Python |
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276 feature of automatic concatenation of adjacent strings and different |
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277 types of string quotes:: |
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278 |
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279 strings_to_translate = ( |
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280 ''"This string will be translated", |
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281 ""'me too', |
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282 ''r"\raw string", |
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283 ''""" |
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284 multiline string""" |
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285 ) |
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286 |
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287 .. [#note_admin.py] In current Roundup sources, this feature is |
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288 extensively used in the ``admin`` module using method docstrings |
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289 as help messages. |
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290 |
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291 Extracting Translatable Messages |
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292 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |
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293 |
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294 The most common tool for message extraction is ``xgettext`` utility |
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295 from `GNU gettext package`_. Unfortunately, this utility has no means |
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296 of `Deferred Translations`_ in Python sources. There is ``xpot`` tool |
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297 from Francois Pinard free `PO utilities`_ that allows to mark strings |
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298 for deferred translations, but it does not handle `plural forms`_. |
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299 |
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300 Roundup overcomes these limitations by using both of these utilities. |
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301 This means that you need both `GNU gettext`_ tools and `PO utilities`_ |
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302 to build the Message Template File yourself. |
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303 |
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304 Latest Message Template File is kept in `Roundup CVS`_ and distributed |
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305 with `Roundup Source`_. If you wish to rebuild the template yourself, |
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306 make sure that you have both ``xpot`` and ``xgettext`` installed and |
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307 just run ``gmake`` (or ``make``, if you are on a `GNU`_ system like |
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308 `linux`_ or `cygwin`_) in the ``locale`` directory. |
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309 |
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310 Translating Messages |
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311 ^^^^^^^^^^^^^^^^^^^^ |
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312 |
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313 Gettext Message File (`PO`_ file) is a plain text file, that can be created |
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314 by simple copying ``roundup.pot`` to new .po file, like this:: |
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315 |
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316 $ cp roundup.pot ru.po |
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317 |
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318 The name of PO file is target locale name, usually just 2-letter language |
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319 code (``ru`` for Russian in the above example). Alternatively, PO file |
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320 may be initialized by ``msginit`` utility from `GNU gettext`_ tools:: |
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321 |
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322 $ msginit -i roundup.pot |
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323 |
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324 ``msginit`` will check your current locale, and initialize the header |
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325 entry, setting language name, rules for `plural forms`_ and, if available, |
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326 translator's name and email address. The name for PO file is also chosen |
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327 based on current locale. |
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328 |
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329 Next, you will need to edit this file, filling all ``msgstr`` lines with |
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330 translations of the above ``msgid`` entries. PO file is a plain text |
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331 file that can be edited with any text editor. However, there are several |
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332 tools that may help you with this process: |
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333 |
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334 - ``po-mode`` for `emacs`_. One of `GNU gettext`_ tools. Very handy, |
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335 definitely recommended if you are comfortable with emacs. Cannot |
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336 handle `plural forms`_ per se, but allows to edit them in simple |
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337 text mode. |
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338 |
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339 - `po filetype plugin`_ for `vim`_. Does not do as much as ``po-mode``, |
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340 but helps in finding untranslated and fuzzy strings, and checking |
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341 code references. Please contact `alexander smishlajev`_ if you |
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342 prefer this, as i have patched this plugin a bit. I have also |
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343 informed the original plugin author about these changes, but got |
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344 no reply so far. |
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345 |
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346 - `poEdit`_ by Vaclav Slavik. Nice cross-platform GUI editor. |
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347 Unfortunately, it does not handle `plural forms`_. Even worse, |
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348 it deletes all messages with plural forms when the file is saved. |
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349 Still, it may be useful to initially translate most of the messages |
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350 and add plural form messages later. |
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351 |
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352 - `KBabel`_. Being part of `KDE`_, it works in X windows only. |
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353 At the first glance looks pretty hairy, with all bells and whistles. |
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354 Haven't had much experience with it, though. |
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355 |
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356 Compiling Message Catalogs |
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357 ^^^^^^^^^^^^^^^^^^^^^^^^^^ |
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358 |
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359 Message catalogs (`PO`_ files) must be compiled into binary form |
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360 (`MO`_ files) before they can be used in the application. This |
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361 compilation is handled by ``msgfmt`` utility from `GNU gettext`_ |
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362 tools. ``GNUmakefile`` in the ``locale`` directory automatically |
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363 compiles all existing message catalogs after updating them from |
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364 Roundup source files. If you wish to rebuild an individual `MO`_ |
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365 file without making everything else, you may, for example:: |
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366 |
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367 $ msgfmt --statistics -o ru.mo ru.po |
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368 |
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369 This way, message translators can check their `PO`_ files without |
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370 extracting strings from source. (Note: String extraction requires |
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371 additional utility that is not part of `GNU gettext`_. See `Extracting |
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372 Translatable Messages`_.) |
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373 |
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374 ----------------- |
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375 |
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376 Back to `Table of Contents`_ |
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377 |
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378 .. _`Table of Contents`: index.html |
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379 .. _`Customising Roundup`: customizing.html |
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380 .. _`Roundup's Design Document`: spec.html |
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381 .. _`implementation notes`: implementation.html |
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382 |
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383 |
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384 .. _External hyperlink targets: |
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385 |
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386 .. _alexander smishlajev: |
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387 .. _als: http://sourceforge.net/users/a1s/ |
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388 .. _cygwin: http://www.cygwin.com/ |
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389 .. _emacs: http://www.gnu.org/software/emacs/ |
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390 .. _gettext package: http://www.gnu.org/software/gettext/ |
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391 .. _gettext module: http://docs.python.org/lib/module-gettext.html |
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392 .. _GNU: http://www.gnu.org/ |
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393 .. _GNU mirror sites: http://www.gnu.org/prep/ftp.html |
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394 .. _KBabel: http://i18n.kde.org/tools/kbabel/ |
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395 .. _KDE: http://www.kde.org/ |
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396 .. _linux: http://www.linux.org/ |
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397 .. _Plural Forms: |
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398 http://www.gnu.org/software/gettext/manual/html_node/gettext_150.html |
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399 .. _po filetype plugin: |
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400 http://vim.sourceforge.net/scripts/script.php?script_id=695 |
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401 .. _PO utilities: http://po-utils.progiciels-bpi.ca/ |
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402 .. _poEdit: http://poedit.sourceforge.net/ |
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403 .. _Roundup CVS: http://sourceforge.net/cvs/?group_id=31577 |
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404 .. _Roundup Source: |
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405 .. _Roundup source distribution: |
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406 .. _Roundup binary distribution: |
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407 http://sourceforge.net/project/showfiles.php?group_id=31577 |
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408 .. _vim: http://www.vim.org/ |
