CMakeLists.txt

################################################################################
# CLI - A simple command line interface.
# Copyright (C) 2016-2021 Daniele Pallastrelli
#
# Boost Software License - Version 1.0 - August 17th, 2003
#
# Permission is hereby granted, free of charge, to any person or organization
# obtaining a copy of the software and accompanying documentation covered by
# this license (the "Software") to use, reproduce, display, distribute,
# execute, and transmit the Software, and to prepare derivative works of the
# Software, and to permit third-parties to whom the Software is furnished to
# do so, all subject to the following:
#
# The copyright notices in the Software and this entire statement, including
# the above license grant, this restriction and the following disclaimer,
# must be included in all copies of the Software, in whole or in part, and
# all derivative works of the Software, unless such copies or derivative
# works are solely in the form of machine-executable object code generated by
# a source language processor.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
# SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
# FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
################################################################################

cmake_minimum_required(VERSION 3.8...3.27)

project(
    cli
    VERSION 2.2.0
    # DESCRIPTION "A library for interactive command line interfaces in modern C++"
    LANGUAGES CXX
)

include(GNUInstallDirs)

# ---------------------------------------------------------------
# Options
# ---------------------------------------------------------------
option(CLI_BuildExamples "Build the examples." OFF)
option(CLI_BuildTests "Build the unit tests." OFF)
option(CLI_UseBoostAsio "Use Boost.Asio library." OFF)
option(CLI_UseStandaloneAsio "Use standalone Asio library." OFF)

# ---------------------------------------------------------------
# Library
# ---------------------------------------------------------------
add_library(cli INTERFACE)
add_library(cli::cli ALIAS cli)

target_include_directories(cli
    INTERFACE
        $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
)

find_package(Threads REQUIRED)
target_link_libraries(cli INTERFACE Threads::Threads)

# ---------------------------------------------------------------
# Boost.Asio support
# ---------------------------------------------------------------
if(CLI_UseBoostAsio)
    if(POLICY CMP0074)
        cmake_policy(SET CMP0074 NEW)   # <PackageName>_ROOT
    endif()

    if(POLICY CMP0144)
        cmake_policy(SET CMP0144 NEW)   # uppercase variables like BOOST_ROOT
    endif()

    if(POLICY CMP0167)
        cmake_policy(SET CMP0167 OLD)   # re-enable FindBoost
    endif()


    set(Boost_NO_BOOST_CMAKE ON)
    find_package(Boost 1.66 QUIET COMPONENTS system date_time)
    add_definitions(-DBOOST_ALL_NO_LIB) # for windows

    if(Boost_FOUND)
        message(STATUS "Using compiled Boost libraries on ${CMAKE_SYSTEM_NAME}")
        target_link_libraries(cli INTERFACE Boost::system Boost::date_time)
    else()
        message(STATUS "Boost libraries not found. Falling back to header-only mode.")
        target_compile_definitions(cli INTERFACE
            BOOST_ERROR_CODE_HEADER_ONLY
            BOOST_SYSTEM_NO_LIB
        )

        # find headers (default locations)
        find_path(BOOST_INCLUDE_PATH "boost/version.hpp")
        if(NOT BOOST_INCLUDE_PATH)
            message(FATAL_ERROR "Boost headers not found for header-only fallback!")
        endif()
        target_include_directories(cli INTERFACE ${BOOST_INCLUDE_PATH})
    endif()

    target_compile_definitions(cli INTERFACE BOOST_ASIO_NO_DEPRECATED=1)
endif()

# ---------------------------------------------------------------
# Standalone Asio support
# ---------------------------------------------------------------
if(CLI_UseStandaloneAsio)
    find_path(STANDALONE_ASIO_INCLUDE_PATH NAMES "asio.hpp" HINTS ${ASIO_INCLUDEDIR})
    mark_as_advanced(STANDALONE_ASIO_INCLUDE_PATH)
    if(NOT STANDALONE_ASIO_INCLUDE_PATH)
        message(FATAL_ERROR "Standalone Asio headers not found. Set ASIO_INCLUDEDIR or STANDALONE_ASIO_INCLUDE_PATH.")
    endif()

    add_library(standalone_asio INTERFACE IMPORTED)
    target_include_directories(standalone_asio SYSTEM INTERFACE ${STANDALONE_ASIO_INCLUDE_PATH})
    target_link_libraries(standalone_asio INTERFACE Threads::Threads)
    target_link_libraries(cli INTERFACE standalone_asio)
endif()

# ---------------------------------------------------------------
# C++ standard
# ---------------------------------------------------------------
if(NOT DEFINED CMAKE_CXX_STANDARD)
    set(CMAKE_CXX_STANDARD 14)
endif()
target_compile_features(cli INTERFACE cxx_std_${CMAKE_CXX_STANDARD})

# ---------------------------------------------------------------
# Windows specific
# ---------------------------------------------------------------
if(WIN32)
    # Set _WIN32_WINNT for Windows 10+
    if(NOT DEFINED _WIN32_WINNT)
        add_definitions(-D_WIN32_WINNT=0x0A00)
    endif()
endif()

# ---------------------------------------------------------------
# Examples
# ---------------------------------------------------------------
if(CLI_BuildExamples)
    add_subdirectory(examples)
endif()

# ---------------------------------------------------------------
# Tests
# ---------------------------------------------------------------
if(CLI_BuildTests)
    enable_testing()
    add_subdirectory(test)
endif()

# ---------------------------------------------------------------
# Install
# ---------------------------------------------------------------
if(NOT CMAKE_SKIP_INSTALL_RULES)
    install(DIRECTORY include/cli DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})

    include(CMakePackageConfigHelpers)
    configure_package_config_file(
        "cliConfig.cmake.in"
        "${CMAKE_CURRENT_BINARY_DIR}/cliConfig.cmake"
        INSTALL_DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/cli"
    )

    # Generate pkg-config .pc file
    set(PKGCONFIG_INSTALL_DIR
        ${CMAKE_INSTALL_DATAROOTDIR}/pkgconfig
        CACHE PATH "Installation directory for pkg-config (cli.pc) file"
    )
    configure_file("cli.pc.in" "cli.pc" @ONLY)

    install(TARGETS cli EXPORT cliTargets LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})
    install(EXPORT cliTargets FILE cliTargets.cmake NAMESPACE cli:: DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/cli)
    install(FILES "${CMAKE_CURRENT_BINARY_DIR}/cliConfig.cmake" DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/cli")
    install(FILES "${CMAKE_CURRENT_BINARY_DIR}/cli.pc" DESTINATION ${PKGCONFIG_INSTALL_DIR})
endif()