if(ENABLE_DOCS)

    add_custom_target(docs ALL

        COMMENT "Generating documentation and manuals in HTML format"

    )

    if(DOXYGEN_FOUND)

        # set input and output files

        set(DOXYGEN_IN ${CMAKE_CURRENT_SOURCE_DIR}/Doxyfile.in)

        set(DOXYGEN_OUT ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile)

        # request to configure the file

        configure_file(${DOXYGEN_IN} ${DOXYGEN_OUT} @ONLY)

        # note the option ALL which allows to build the docs together with the application

        add_custom_command(

            OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/html"

            DEPENDS ${DOXYGEN_OUT}

            COMMAND "${DOXYGEN_EXECUTABLE}" "${DOXYGEN_OUT}"

            WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"

            COMMENT "Generating API documentation with Doxygen"

        )

        add_custom_target(

            doxygen_docs

            DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/html"

        )

        add_dependencies(docs doxygen_docs)

        install(DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/html"

            DESTINATION "${CMAKE_INSTALL_DOCDIR}"

        )

    endif()

    if(ASCIIDOC_EXECUTABLE)

        add_custom_command(

            OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/manual/manual.html"

            DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/manual/manual.adoc" "${CMAKE_CURRENT_SOURCE_DIR}/manual/images"

            COMMAND ${CMAKE_COMMAND} -E make_directory "${CMAKE_CURRENT_BINARY_DIR}/manual"

            COMMAND "${ASCIIDOC_EXECUTABLE}" -b html5 -o "${CMAKE_CURRENT_BINARY_DIR}/manual/manual.html" "${CMAKE_CURRENT_SOURCE_DIR}/manual/manual.adoc"

            COMMAND ${CMAKE_COMMAND} -E copy_directory "${CMAKE_CURRENT_SOURCE_DIR}/manual/images" "${CMAKE_CURRENT_BINARY_DIR}/manual/images"

            COMMENT "Generating OpenSCAP User Manual in HTML format"

        )

        add_custom_target(

            user_manual

            DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/manual/manual.html"

        )

        install(DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/manual"

            DESTINATION "${CMAKE_INSTALL_DOCDIR}"

        )

        add_custom_command(

            OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/developer/developer.html"

            DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/developer/developer.adoc"

            COMMAND ${CMAKE_COMMAND} -E make_directory "${CMAKE_CURRENT_BINARY_DIR}/developer"

            COMMAND "${ASCIIDOC_EXECUTABLE}" -b html5 -o "${CMAKE_CURRENT_BINARY_DIR}/developer/developer.html" "${CMAKE_CURRENT_SOURCE_DIR}/developer/developer.adoc"

            COMMENT "Generating OpenSCAP Developer Manual in HTML format"

        )

        add_custom_target(

            developer_manual

            DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/developer/developer.html"

        )

        # We are not installing the OpenSCAP Developer manual because it does not

        # make any sense to install this for end-users.

        add_custom_command(

            OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/contribute/contribute.html" "${CMAKE_CURRENT_BINARY_DIR}/contribute/testing.html" "${CMAKE_CURRENT_BINARY_DIR}/contribute/versioning.html"

            DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/contribute/contribute.adoc" "${CMAKE_CURRENT_SOURCE_DIR}/contribute/testing.adoc" "${CMAKE_CURRENT_SOURCE_DIR}/contribute/versioning.adoc"

            COMMAND ${CMAKE_COMMAND} -E make_directory "${CMAKE_CURRENT_BINARY_DIR}/contribute"

            COMMAND "${ASCIIDOC_EXECUTABLE}" -b html5 -o "${CMAKE_CURRENT_BINARY_DIR}/contribute/contribute.html" "${CMAKE_CURRENT_SOURCE_DIR}/contribute/contribute.adoc"

            COMMAND "${ASCIIDOC_EXECUTABLE}" -b html5 -o "${CMAKE_CURRENT_BINARY_DIR}/contribute/testing.html" "${CMAKE_CURRENT_SOURCE_DIR}/contribute/testing.adoc"

            COMMAND "${ASCIIDOC_EXECUTABLE}" -b html5 -o "${CMAKE_CURRENT_BINARY_DIR}/contribute/versioning.html" "${CMAKE_CURRENT_SOURCE_DIR}/contribute/versioning.adoc"

            COMMENT "Generating contribute documentation in HTML format"

        )

        add_custom_target(

            contribute_docs

            DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/contribute/contribute.html" "${CMAKE_CURRENT_BINARY_DIR}/contribute/testing.html" "${CMAKE_CURRENT_BINARY_DIR}/contribute/versioning.html"

        )

        # We are not installing the contribute documentation because it does not

        # make any sense to install this for end-users.

        add_dependencies(docs user_manual developer_manual contribute_docs)

    endif()

endif()