# Copyright 2018-2020, Collabora, Ltd.
# SPDX-License-Identifier: BSL-1.0

# check if Doxygen is installed
find_package(Doxygen)
cmake_dependent_option(BUILD_DOC "Build documentation" ON "DOXYGEN_FOUND" OFF)
cmake_dependent_option(BUILD_DOC_WARN_UNDOCUMENTED "Warn on undocumented entities when building documentation" OFF "DOXYGEN_FOUND" OFF)
cmake_dependent_option(BUILD_DOC_EXTRACT_ALL "Extract all entities for documentation, not just documented ones (conflicts with BUILD_DOCS_WARN_UNDOCUMENTED)" ON "DOXYGEN_FOUND; NOT BUILD_DOCS_WARN_UNDOCUMENTED" OFF)

if(BUILD_DOC)
    if(BUILD_DOC_WARN_UNDOCUMENTED)
        set(DOXYGEN_WARN_UNDOCUMENTED YES)
    else()
        set(DOXYGEN_WARN_UNDOCUMENTED NO)
    endif()
    if(BUILD_DOC_EXTRACT_ALL)
        set(DOXYGEN_EXTRACT_ALL YES)
    else()
        set(DOXYGEN_EXTRACT_ALL NO)
    endif()

    # set input and output files
    set(DOXYGEN_IN ${CMAKE_CURRENT_SOURCE_DIR}/Doxyfile.in)
    set(DOXYGEN_OUT ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile)

    set(CURBUILDDIR ${CMAKE_CURRENT_BINARY_DIR})
    set(SRCDIR ${PROJECT_SOURCE_DIR})
    set(BUILDDIR ${PROJECT_BINARY_DIR})
    # request to configure the file
    configure_file(${DOXYGEN_IN} ${DOXYGEN_OUT} @ONLY)

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