# ---------------------- Doxygen ----------------------
# check for Doxygen and eventually configure it

# define the option
option(BUILD_DOXYGEN_DOC "Build Doxygen documentation" ON)

# this is very much inspired by https://vicrucann.github.io/tutorials/quick-cmake-doxygen/

# check if Doxygen is installed
find_package(Doxygen)
if(DOXYGEN_FOUND)
    # set input and output files
    set(DOXYGEN_IN "${PUGS_SOURCE_DIR}/doc/Doxyfile.in")
    set(DOXYGEN_OUT "${PUGS_BINARY_DIR}/Doxyfile")

    # request to configure the file
    configure_file(${DOXYGEN_IN} ${DOXYGEN_OUT} @ONLY)
    message(STATUS "Configuring Doxygen")

    # note the option ALL which allows to build the docs together with the application
    add_custom_target(doxygen
        COMMAND ${DOXYGEN_EXECUTABLE} ${DOXYGEN_OUT}
        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
        COMMENT "Generating API documentation with Doxygen"
        VERBATIM )

    # building doc builds doxygen
    add_custom_target(doc doxygen)
endif()