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FIND_PACKAGE(Doxygen)

IF(DOXYGEN_EXECUTABLE AND UNIX)
    ADD_CUSTOM_COMMAND(
        OUTPUT
            ${DOCUMENTATION_OUTPUT_PATH}/${PROJECT_NAME}
        COMMAND
            mkdir -p ${DOCUMENTATION_OUTPUT_PATH}/${PROJECT_NAME}
    )
    
    ADD_CUSTOM_COMMAND(
        OUTPUT
            ${DOCUMENTATION_OUTPUT_PATH}/${PROJECT_NAME}/Doxyfile
        COMMAND
            sed ${CMAKE_SOURCE_DIR}/Doxyfile -e 's!PROJECT_SOURCE_DIR!${PROJECT_SOURCE_DIR}!g' -e 's!DOCUMENTATION_OUTPUT_PATH!${DOCUMENTATION_OUTPUT_PATH}!g' -e 's!_PROJECT_NAME!${PROJECT_NAME}!g' -e 's!TAG_FILES!${TAG_FILES}!g' > Doxyfile
        DEPENDS
            ${CMAKE_SOURCE_DIR}/Doxyfile
            ${DOCUMENTATION_OUTPUT_PATH}/${PROJECT_NAME}
        WORKING_DIRECTORY
            ${DOCUMENTATION_OUTPUT_PATH}/${PROJECT_NAME}
    )
    
    ADD_CUSTOM_COMMAND(
        OUTPUT
            ${DOCUMENTATION_OUTPUT_PATH}/${PROJECT_NAME}/index.html
        COMMAND
            ${DOXYGEN_EXECUTABLE}
        DEPENDS
            ${DOCUMENTATION_OUTPUT_PATH}/${PROJECT_NAME}/Doxyfile
        WORKING_DIRECTORY
            ${DOCUMENTATION_OUTPUT_PATH}/${PROJECT_NAME}
    )
    
    ADD_CUSTOM_TARGET(doxygen
        ALL
            echo
        DEPENDS
            ${DOCUMENTATION_OUTPUT_PATH}/${PROJECT_NAME}/index.html
    )
    
    INSTALL(
        DIRECTORY
            ${DOCUMENTATION_OUTPUT_PATH}/${PROJECT_NAME}
        DESTINATION
            ${CMAKE_INSTALL_PREFIX}/share/doc/${CMAKE_PROJECT_NAME}-${SIGEN_VERSION}/${PROJECT_NAME}
        COMPONENT
            documentation
    )
ENDIF(DOXYGEN_EXECUTABLE AND UNIX)