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doc: add CMake macros documentation
author David Demelier <markand@malikania.fr>
date Mon, 30 Nov 2020 10:54:59 +0100
parents 498da86d1cd7
children
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1 #
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2 # MolkoBuildTranslations.cmake -- CMake build system for molko
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3 #
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4 # Copyright (c) 2020 David Demelier <markand@malikania.fr>
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5 #
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6 # Permission to use, copy, modify, and/or distribute this software for any
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7 # purpose with or without fee is hereby granted, provided that the above
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8 # copyright notice and this permission notice appear in all copies.
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9 #
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10 # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 #
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18
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19 #
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20 # # molko_build_translations
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21 #
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22 # Build translations and update them.
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23 #
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24 # ## Synopsis
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25 #
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26 # ```cmake
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27 # molko_build_translations(
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28 # TARGET target name
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29 # SOURCES target sources
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30 # OUTPUTS output variable
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31 # TRANSLATIONS list of localizations
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32 # )
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33 # ```
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34 #
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35 # Generate target and output commands for NLS (via GNU gettext) support for the
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36 # given *TARGET* name.
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37 #
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38 # The argument *SOURCES* must contain sources to extract gettext keywords, it
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39 # will search for _, N_. The list of *SOURCES* can contain any files, only .c
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40 # and .h will be filtered.
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41 #
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42 # The argument *OUTPUTS* will be set with the generated .mo files in the binary
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43 # directory and installed to *CMAKE_INSTALL_LOCALEDIR*.
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44 #
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45 # The argument *TRANSLATIONS* should contain a list of languages supported in the
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46 # gettext form (ll_LL@variant, see ISO 639 and ISO 3166 for more details).
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47 #
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48 # This macro create a `<TARGET>-po` target that will recreate the .pot file and
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49 # every .po files in the nls/ directory for each language specified in
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50 # *TRANSLATIONS*. Note, if you add a new language into translations but do not
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51 # copy the .pot file, a warning will be issued and you should copy the .pot
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52 # file as the new .po language file.
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53 #
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54 # Since the target is modifying files directly in the source tree they are not
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55 # included in any build process and must be invoked manually.
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56 #
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57
241
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58 if (MOLKO_WITH_NLS)
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59 find_program(XGETTEXT_EXE xgettext)
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60 find_program(MSGMERGE_EXE msgmerge)
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61 find_program(MSGFMT_EXE msgfmt)
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62 endif ()
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63
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64 if (MOLKO_WITH_NLS AND XGETTEXT_EXE AND MSGMERGE_EXE)
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65 macro(molko_build_translations)
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66 set(options)
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67 set(oneValueArgs TARGET OUTPUTS)
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68 set(multiValueArgs SOURCES TRANSLATIONS)
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69
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70 cmake_parse_arguments(NLS "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
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71
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72 if (NOT NLS_OUTPUTS)
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73 message(FATAL_ERROR "Missing OUTPUTS argument")
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74 endif ()
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75 if (NOT NLS_TARGET)
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76 message(FATAL_ERROR "Missing TARGET argument")
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77 endif ()
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78 if (NOT NLS_SOURCES)
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79 message(FATAL_ERROR "Missing SOURCES argument")
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80 endif ()
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81
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82 # Remove non C files.
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83 list(FILTER NLS_SOURCES INCLUDE REGEX "\\.[ch$]")
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84 set(pot ${CMAKE_CURRENT_SOURCE_DIR}/nls/${NLS_TARGET}.pot)
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85
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86 # First command to generate the .pot.
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87 list(
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88 APPEND
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89 commands
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90 COMMAND ${CMAKE_COMMAND} -E make_directory ${CMAKE_CURRENT_SOURCE_DIR}/nls
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91 COMMAND ${XGETTEXT_EXE} -cj -k_ -kN_ -LC -s -o ${pot} ${NLS_SOURCES}
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92 )
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93
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94 #
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95 # For every translation create a msgmerge command and output
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96 # file.
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97 #
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98 set(outputs)
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99
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100 foreach (t ${NLS_TRANSLATIONS})
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101 set(po ${CMAKE_CURRENT_SOURCE_DIR}/nls/${t}.po)
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102
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103 #
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104 # If library dir isn't absolute, install them in the
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105 # build directory so we can use translations during
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106 # development.
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107 #
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108 if (NOT IS_ABSOLUTE ${CMAKE_INSTALL_LIBDIR})
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109 set(modir ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/${CMAKE_INSTALL_LOCALEDIR}/${t}/LC_MESSAGES)
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110 set(mo ${modir}/${NLS_TARGET}.mo)
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111 else ()
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112 set(modir ${CMAKE_CURRENT_BINARY_DIR}/${t})
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113 set(mo ${CMAKE_CURRENT_BINARY_DIR}/${NLS_TARGET}.mo)
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114 endif ()
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115
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116 if (NOT EXISTS ${po})
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117 message(WARNING "Missing translation ${po}")
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118 endif ()
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119
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120 # Commands to generate .po files from the .pot.
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121 list(APPEND commands COMMAND ${MSGMERGE_EXE} --backup=off -q -U ${po} ${pot})
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122
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123 # Finally generate a .mo output from po file.
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124 add_custom_command(
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125 OUTPUT ${mo}
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126 VERBATIM
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127 COMMAND ${CMAKE_COMMAND} -E make_directory ${modir}
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128 COMMAND ${MSGFMT_EXE} -o ${mo} ${po}
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129 DEPENDS ${po}
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130 COMMENT "Generating translation binary ${mo}"
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131 )
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132
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133 list(APPEND outputs ${mo})
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134
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135 install(
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136 FILES ${mo}
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137 DESTINATION ${CMAKE_INSTALL_LOCALEDIR}/${t}/LC_MESSAGES
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138 RENAME ${NLS_TARGET}.mo
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139 )
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140 endforeach ()
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141
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142 set(${NLS_OUTPUTS} ${outputs})
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143 source_group("mo" FILES ${outputs})
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144
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145 # User target to update .pot and .po files.
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146 add_custom_target(
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147 ${NLS_TARGET}-po
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148 VERBATIM
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149 COMMENT "Generating translations for ${NLS_TARGET}"
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150 ${commands}
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151 )
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152
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153 set_target_properties(${NLS_TARGET}-po PROPERTIES FOLDER nls)
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154 endmacro()
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155 else ()
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156 function(molko_build_translations)
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157 endfunction()
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158 endif ()