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annotate cmake/FindPandoc.cmake @ 676:a84f1baeb9e7

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c/extern: provided by libbsd
author David Demelier <markand@malikania.fr>
date Thu, 24 Mar 2022 07:32:50 +0100
parents 5bd9424a523a
children
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1 # FindPandoc
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2 # ----------
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3 #
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4 # Find Pandoc executable, this modules defines:
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5 #
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6 # Pandoc_EXECUTABLE, where to find pandoc's executable
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7 # Pandoc_FOUND, if it is found
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8 # Pandoc_VERSION, the version
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9 #
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10 # This module also defines the following macros:
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11 #
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12 # pandoc(
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13 # SOURCES file1 [file2 ...]
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14 # OUTPUT output
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15 # [FROM format]
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16 # [TO format]
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17 # [TARGET target]
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18 # [DEPENDS dependency ...]
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19 # [ALL]
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20 # [TOC]
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21 # [STANDALONE]
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22 # [MAKE_DIRECTORY]
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23 # [TEMPLATE file]
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24 # [FILTER filter]
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25 # [HEADER header ...]
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26 # [FOOTER footer ...]
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27 # [BODY body ...]
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28 # [VARIABLE var ...]
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29 # [METADATA meta ...]
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30 # [ARGS argument ...]
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31 # [WORKING_DIRECTORY directory]
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32 # )
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33 #
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34 # The sources files are listed in the parameter SOURCES, all files are passed
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35 # in the same order they are passed to that variable.
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36 #
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37 # The OUTPUT file is set with OUTPUT. It is generated only if one of the file
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38 # has changed.
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39 #
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40 # The FROM (-f) and TO (-t) arguments specify respectively the source and
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41 # destinations formats.
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42 #
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43 # If the parameter TARGET is set, then a target named `target` will be added
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44 # with the OUTPUT file as the dependency but not listed as sources files.
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45 # But the SOURCES files will be added as the target sources in the IDE.
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46 #
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47 # Optional dependencies can be added to the output command (not the target) with
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48 # the DEPENDS parameter.
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49 #
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50 # If ALL is set and TARGET is also set, the target will be added to the ALL_BUILD.
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51 #
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52 # If TOC (--toc) is specified, a table of content will be automatically created.
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53 #
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54 # If STANDALONE (-s) is set, the compilation will assume that it is standalone
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55 # and adds the necessary of the output format.
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56 #
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57 # Optional MAKE_DIRECTORY can be set to create the output directory before
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58 # pandoc processes the file (recommended).
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59 #
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60 # The TEMPLATE parameter can be used to specify the formate template file.
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61 #
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62 # You can set a filter with the parameter FILTER. The filter will be added to
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63 # the output dependencies so you can safely use CMake's targets.
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64 #
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65 # The HEADER (-H), FOOTER (-A) and BODY (-B) are copied verbatim before, just
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66 # after and after the body respectively. They can be set more than once.
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67 #
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68 # You can pass variables (-V) and metadata (-M) to the parameters VARIABLE
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69 # and METADATA, be sure to pass the same syntax as pandoc. (e.g VARIABLE foo=1)
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70 #
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71 # ARGS is an optional list of additional arguments to pass to pandoc.
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72 #
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73 # The parameter WORKING_DIRECTORY can be set to change the directory when pandoc
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74 # is invoked.
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75 #
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76
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77 find_program(
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78 Pandoc_EXECUTABLE
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79 NAMES pandoc
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80 DOC "Pandoc executable"
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81 )
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82
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83 include(FindPackageHandleStandardArgs)
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84 include(CMakeParseArguments)
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85
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86 # Extract the version
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87 if (Pandoc_EXECUTABLE)
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88 execute_process(
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89 COMMAND ${Pandoc_EXECUTABLE} --version
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90 OUTPUT_VARIABLE _pandoc_version_tmp
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91 )
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92
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93 if (_pandoc_version_tmp MATCHES "^pandoc[^ ]* ([0-9]+\\.[0-9]+\\.[0-9]+)")
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94 set(Pandoc_VERSION "${CMAKE_MATCH_1}")
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95 endif ()
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96 endif ()
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97
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98 find_package_handle_standard_args(
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99 Pandoc
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100 FOUND_VAR Pandoc_FOUND
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101 VERSION_VAR Pandoc_VERSION
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102 REQUIRED_VARS Pandoc_EXECUTABLE
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103 )
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104
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105 if (Pandoc_FOUND)
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106 function(pandoc)
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107 set(options MAKE_DIRECTORY STANDALONE TOC)
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108 set(oneValueArgs FILTER FROM TARGET TEMPLATE TO OUTPUT WORKING_DIRECTORY)
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109 set(multiValueArgs ARGS FOOTER HEADER METADATA SOURCES VARIABLE)
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110
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111 #
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112 # The following variables will be set in that scope:
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113 # _pandoc_arguments - List of all arguments that will passed to pandoc invocation.
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114 # _pandoc_depends - List of all dependencies attached to the add_custom_command.
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115 # _pandoc_mkdir - The mkdir command if MAKE_DIRECTORY is set
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116 # _pandoc_output_base - The base output directory
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117 #
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118 cmake_parse_arguments(PANDOC "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
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119
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120 #
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121 # Output and sources are mandatory
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122 #
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123 if (NOT PANDOC_OUTPUT)
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124 message(FATAL_ERROR "Please define OUTPUT")
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125 elseif (NOT PANDOC_SOURCES)
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126 message(FATAL_ERROR "Please defines SOURCES")
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127 endif ()
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128
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129 #
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130 # Handle the filter with care.
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131 #
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132 # 1. If it is a target, depend on it and use a generator
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133 # expression to get its full path on the disk.
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134 # 2. If it is not a target, just use the user provided path.
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135 #
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136 if (PANDOC_FILTER)
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137 # If it is a target, add a dependency so that it is built
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138 if (TARGET ${PANDOC_FILTER})
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139 list(APPEND _pandoc_arguments --filter "$<TARGET_FILE:${PANDOC_FILTER}>")
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140 list(APPEND _pandoc_depends ${PANDOC_FILTER})
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141 else ()
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142 list(APPEND _pandoc_arguments --filter ${PANDOC_FILTER})
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143 endif ()
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144 endif ()
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145
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146 if (PANDOC_TOC)
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147 list(APPEND _pandoc_arguments --toc)
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148 endif ()
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149 if (PANDOC_STANDALONE)
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150 list(APPEND _pandoc_arguments -s)
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151 endif ()
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152 if (PANDOC_FROM)
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153 list(APPEND _pandoc_arguments -f ${PANDOC_FROM})
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154 endif ()
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155 if (PANDOC_TO)
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156 list(APPEND _pandoc_arguments -t ${PANDOC_TO})
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157 endif ()
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158 if (PANDOC_TEMPLATE)
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159 list(APPEND _pandoc_arguments --template ${PANDOC_TEMPLATE})
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160 list(APPEND _pandoc_depends ${PANDOC_TEMPLATE})
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161 endif ()
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162
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163 # Header, footers and body
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164 foreach (h ${PANDOC_HEADER})
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165 list(APPEND _pandoc_arguments -H ${h})
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166 list(APPEND _pandoc_depends ${h})
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167 endforeach ()
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168 foreach (b ${PANDOC_BODY})
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169 list(APPEND _pandoc_arguments -B ${b})
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170 list(APPEND _pandoc_depends ${b})
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171 endforeach ()
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172 foreach (f ${PANDOC_FOOTER})
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173 list(APPEND _pandoc_arguments -A ${f})
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174 list(APPEND _pandoc_depends ${f})
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175 endforeach ()
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176
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177 # Variables and metadata
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178 foreach (var ${PANDOC_VARIABLE})
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179 list(APPEND _pandoc_arguments -V ${var})
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180 endforeach ()
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181 foreach (meta ${PANDOC_METADATA})
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182 list(APPEND _pandoc_arguments -M ${meta})
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183 endforeach ()
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184
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185 # Optional list of arguments
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186 foreach (arg ${PANDOC_ARGS})
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187 list(APPEND _pandoc_arguments ${arg})
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188 endforeach ()
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189
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190 # Output and sources
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191 list(APPEND _pandoc_arguments -o ${PANDOC_OUTPUT})
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192
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193 #
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194 # The following variables are set within the loop:
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195 #
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196 # _pandoc_input The absolute path to the input file.
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197 # _pandoc_output_base The base output directory.
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198 #
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199 foreach (s ${PANDOC_SOURCES})
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200 get_filename_component(_pandoc_input ${s} ABSOLUTE)
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201 get_filename_component(_pandoc_output_base ${PANDOC_OUTPUT} DIRECTORY)
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202 list(APPEND _pandoc_depends ${_pandoc_input})
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203 list(APPEND _pandoc_arguments ${_pandoc_input})
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204 endforeach ()
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205
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206 # Create the output directory if requested
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207 if (PANDOC_MAKE_DIRECTORY)
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208 set(_pandoc_mkdir ${CMAKE_COMMAND} -E make_directory ${_pandoc_output_base})
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209 endif ()
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210
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211 add_custom_command(
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212 OUTPUT ${PANDOC_OUTPUT}
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213 COMMAND ${_pandoc_mkdir}
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214 COMMAND ${Pandoc_EXECUTABLE} ${_pandoc_arguments}
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215 DEPENDS ${_pandoc_depends} ${PANDOC_DEPENDS}
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216 WORKING_DIRECTORY ${PANDOC_WORKING_DIRECTORY}
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217 VERBATIM
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218 )
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219
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220 if (PANDOC_TARGET)
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221 add_custom_target(
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222 ${PANDOC_TARGET} ${PANDOC_ALL}
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223 SOURCES ${_pandoc_depends}
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224 DEPENDS ${PANDOC_OUTPUT}
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225 WORKING_DIRECTORY ${PANDOC_WORKING_DIRECTORY}
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226 )
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227 endif ()
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228 endfunction()
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229 endif ()
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230
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231 mark_as_advanced(Pandoc_EXECUTABLE)