CMakeLists.txt

# CMake version 3.12 provides FindPython.
# CMake version 3.9 provides OpenMP per language.
cmake_minimum_required(VERSION 3.12)

include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/utils.cmake)

project(pico_tree
    LANGUAGES CXX
    VERSION 0.8.3
    DESCRIPTION "PicoTree is a C++ header only library for fast nearest neighbor searches and range searches using a KdTree."
    HOMEPAGE_URL "https://github.com/Jaybro/pico_tree")

if(NOT CMAKE_BUILD_TYPE)
    set(CMAKE_BUILD_TYPE "Release")
endif()

# ##############################################################################
# PicoTree, examples, unit tests and documentation.
# ##############################################################################
set(PROJECT_PACKAGE_NAME "PicoTree")
add_subdirectory(src)

# Ignored when running cmake from setup.py using scikit-build.
if(NOT SKBUILD)
    option(BUILD_EXAMPLES "Enable the creation of PicoTree examples." ON)
    message(STATUS "BUILD_EXAMPLES: ${BUILD_EXAMPLES}")

    if(BUILD_EXAMPLES)
        add_subdirectory(examples)
    endif()

    find_package(GTest QUIET)

    if(GTEST_FOUND)
        include(CTest)
        message(STATUS "BUILD_TESTING: ${BUILD_TESTING}")

        if(BUILD_TESTING)
            # Tests are dependent on some common code.
            # For now, the understory is considered important enough to be tested.
            if(NOT TARGET pico_toolshed)
                add_subdirectory(examples/pico_toolshed)
                add_subdirectory(examples/pico_understory)
            endif()

            enable_testing()
            add_subdirectory(test)
        endif()
    else()
        message(STATUS "GTest not found. Unit tests cannot be build.")
    endif()

    find_package(Doxygen QUIET)

    if(DOXYGEN_FOUND)
        set(DOC_TARGET_NAME ${PROJECT_NAME}_doc)

        # Hide the internal namespace from the documentation.
        # set(DOXYGEN_EXCLUDE_SYMBOLS "internal")
        doxygen_add_docs(
            ${DOC_TARGET_NAME}
            src/pico_tree)

        message(STATUS "Doxygen found. To build the documentation: cmake --build . --target ${DOC_TARGET_NAME}")
    else()
        message(STATUS "Doxygen not found. Documentation cannot be build.")
    endif()
endif()