CMakeLists.txt

cmake_minimum_required(VERSION 3.4)
# Note: this is a header only library. If you have an older CMake than 3.4,
# just add the CLI11/include directory and that's all you need to do.

# Make sure users don't get warnings on a tested (3.4 to 3.16) version
# of CMake. For most of the policies, the new version is better (hence the change).
# We don't use the 3.4...3.17 syntax because of a bug in an older MSVC's
# built-in and modified CMake 3.11
if(${CMAKE_VERSION} VERSION_LESS 3.17)
    cmake_policy(VERSION ${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION})
else()
    cmake_policy(VERSION 3.17)
endif()

set(VERSION_REGEX "#define CLI11_VERSION[ \t]+\"(.+)\"")

# Read in the line containing the version
file(STRINGS "${CMAKE_CURRENT_SOURCE_DIR}/include/CLI/Version.hpp"
    VERSION_STRING REGEX ${VERSION_REGEX})

# Pick out just the version
string(REGEX REPLACE ${VERSION_REGEX} "\\1" VERSION_STRING "${VERSION_STRING}")

# Add the project
project(CLI11 LANGUAGES CXX VERSION ${VERSION_STRING})

# Print the version number of CMake if this is the main project
if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME)
    message(STATUS "CMake ${CMAKE_VERSION}")
endif()

include(CMakeDependentOption)
include(GNUInstallDirs)
include(CTest)

if(NOT CMAKE_VERSION VERSION_LESS 3.11)
    include(FetchContent)
endif()

find_package(Doxygen)

list(APPEND force-libcxx "CMAKE_CXX_COMPILER_ID STREQUAL \"Clang\"")
list(APPEND force-libcxx "CMAKE_SYSTEM_NAME STREQUAL \"Linux\"")
list(APPEND force-libcxx "CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME")

list(APPEND build-docs "CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME")
list(APPEND build-docs "NOT CMAKE_VERSION VERSION_LESS 3.11")
list(APPEND build-docs "Doxygen_FOUND")

# Necessary to support paths with spaces, see #457
if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/docs")
    set(docs_EXIST TRUE)
else()
    set(docs_EXIST FALSE)
endif()
list(APPEND build-docs "docs_EXIST")

if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/examples")
    set(examples_EXIST TRUE)
else()
    set(examples_EXIST FALSE)
endif()

option(CLI11_WARNINGS_AS_ERRORS "Turn all warnings into errors (for CI)")
option(CLI11_SINGLE_FILE "Generate a single header file")
cmake_dependent_option(CLI11_SANITIZERS
    "Download the sanitizers CMake config" OFF
    "NOT CMAKE_VERSION VERSION_LESS 3.11" OFF)

cmake_dependent_option(CLI11_BUILD_DOCS
    "Build CLI11 documentation" ON
    "${build-docs}" OFF)

cmake_dependent_option(CLI11_BUILD_TESTS
    "Build CLI11 tests" ON
    "BUILD_TESTING;CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME" OFF)

cmake_dependent_option(CLI11_BUILD_EXAMPLES
    "Build CLI11 examples" ON
    "CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME;${examples_EXIST}" OFF)

cmake_dependent_option(CLI11_BUILD_EXAMPLES_JSON
    "Build CLI11 json example" OFF
    "CLI11_BUILD_EXAMPLES;NOT CMAKE_VERSION VERSION_LESS 3.11" OFF)

cmake_dependent_option(CLI11_SINGLE_FILE_TESTS
    "Duplicate all the tests for a single file build" OFF
    "BUILD_TESTING;CLI11_SINGLE_FILE" OFF)

cmake_dependent_option(CLI11_INSTALL
    "Install the CLI11 folder to include during install process" ON
    "CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME" OFF)

cmake_dependent_option(CLI11_FORCE_LIBCXX
    "Force clang to use libc++ instead of libstdc++ (Linux only)" OFF
    "${force-libcxx}" OFF)

cmake_dependent_option(CLI11_CUDA_TESTS
    "Build the tests with NVCC to check for warnings there - requires CMake 3.9+" OFF
    "CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME" OFF)

cmake_dependent_option(CLI11_CLANG_TIDY
    "Look for and use Clang-Tidy" OFF
    "CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME;NOT CMAKE_VERSION VERSION_LESS 3.6" OFF)
set(CLI11_CLANG_TIDY_OPTIONS "" CACHE STRING "Clang tidy options, such as -fix, semicolon separated")

if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME AND NOT DEFINED CMAKE_CXX_STANDARD)
    set(CMAKE_CXX_STANDARD 11)
endif()

if(NOT DEFINED CMAKE_CXX_EXTENSIONS)
    set(CMAKE_CXX_EXTENSIONS OFF)
endif()

if(NOT DEFINED CMAKE_CXX_STANDARD_REQUIRED)
    set(CMAKE_CXX_STANDARD_REQUIRED ON)
endif()


# Allow IDE's to group targets into folders
if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME)
    set_property(GLOBAL PROPERTY USE_FOLDERS ON)
endif()

if(CMAKE_VERSION VERSION_LESS 3.10)
    message(STATUS "CMake 3.10+ adds Doxygen support. Update CMake to build documentation")
elseif(NOT Doxygen_FOUND)
    message(STATUS "Doxygen not found, building docs has been disabled")
endif()

# Special target that adds warnings. Is not exported.
add_library(CLI11_warnings INTERFACE)

set(unix-warnings -Wall -Wextra -pedantic -Wshadow -Wsign-conversion -Wswitch-enum)

# Buggy in GCC 4.8
if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9)
    list(APPEND unix-warnings -Weffc++)
endif()

target_compile_options(CLI11_warnings
   INTERFACE
     $<$<BOOL:${CLI11_FORCE_LIBCXX}>:-stdlib=libc++>
     $<$<CXX_COMPILER_ID:MSVC>:/W4 $<$<BOOL:${CLI11_WARNINGS_AS_ERRORS}>:/WX>>
     $<$<NOT:$<CXX_COMPILER_ID:MSVC>>:${unix-warnings} $<$<BOOL:${CLI11_WARNINGS_AS_ERRORS}>:-Werror>>)


 if(NOT CMAKE_VERSION VERSION_LESS 3.13)
     target_link_options(CLI11_warnings
         INTERFACE
         $<$<BOOL:${CLI11_FORCE_LIBCXX}>:-stdlib=libc++>)
 endif()


# Allow IDE's to group targets into folders
add_library(CLI11 INTERFACE)
add_library(CLI11::CLI11 ALIAS CLI11) # for add_subdirectory calls

# Duplicated because CMake adds the current source dir if you don't.
target_include_directories(CLI11 INTERFACE
     $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
     $<INSTALL_INTERFACE:include>)


# To see in IDE, headers must be listed for target
set(header-patterns "${PROJECT_SOURCE_DIR}/include/CLI/*")
if(NOT CMAKE_VERSION VERSION_LESS 3.12)
  list(INSERT header-patterns 0 CONFIGURE_DEPENDS)
endif()

file(GLOB CLI11_headers ${header-patterns})

# Allow tests to be run on CUDA
 if(CLI11_CUDA_TESTS)
     enable_language(CUDA)

     # Print out warning and error numbers
     set(CMAKE_CUDA_FLAGS "${CMAKE_CUDA_FLAGS} -Xcudafe --display_error_number")
 endif()


# Prepare Clang-Tidy
if(CLI11_CLANG_TIDY)
    find_program(
        CLANG_TIDY_EXE
        NAMES "clang-tidy"
        DOC "Path to clang-tidy executable"
        REQUIRED
        )

    set(DO_CLANG_TIDY "${CLANG_TIDY_EXE}" ${CLI11_CLANG_TIDY_OPTIONS})
endif()


# This folder should be installed
if(CLI11_INSTALL)
    install(DIRECTORY "${PROJECT_SOURCE_DIR}/include/"
        DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}")

    # Make an export target
    install(TARGETS CLI11 EXPORT CLI11Targets)

    # Use find_package on the installed package
    # Since we have no custom code, we can directly write this
    # to Config.cmake (otherwise we'd have a custom config and would
    # import Targets.cmake

    # Add the version in a CMake readable way
    configure_file("cmake/CLI11ConfigVersion.cmake.in"
       "CLI11ConfigVersion.cmake" @ONLY)

    # Make version available in the install
    install(FILES "${PROJECT_BINARY_DIR}/CLI11ConfigVersion.cmake"
        DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/CLI11")

    # Install the export target as a file
    install(EXPORT CLI11Targets
        FILE CLI11Config.cmake
        NAMESPACE CLI11::
        DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/CLI11")

    # Use find_package on the installed package
    export(TARGETS CLI11
        NAMESPACE CLI11::
        FILE CLI11Targets.cmake)

    # Register in the user cmake package registry
    export(PACKAGE CLI11)
endif()

if(CLI11_SINGLE_FILE)
    # Single file test
    if(CMAKE_VERSION VERSION_LESS 3.12)
        find_package(PythonInterp REQUIRED)
        add_executable(Python::Interpreter IMPORTED)
        set_target_properties(Python::Interpreter
            PROPERTIES
            IMPORTED_LOCATION "${PYTHON_EXECUTABLE}"
            VERSION "${PYTHON_VERSION_STRING}")
    else()
        find_package(Python COMPONENTS Interpreter REQUIRED)
    endif()

    file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/include")
    add_custom_command(OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/include/CLI11.hpp"
        COMMAND Python::Interpreter
        "${CMAKE_CURRENT_SOURCE_DIR}/scripts/MakeSingleHeader.py"
        "${CMAKE_CURRENT_BINARY_DIR}/include/CLI11.hpp"
        DEPENDS
        "${CMAKE_CURRENT_SOURCE_DIR}/include/CLI/CLI.hpp"
        ${CLI11_headers})
    add_custom_target(CLI11-generate-single-file ALL
        DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/include/CLI11.hpp")
    set_property(TARGET CLI11-generate-single-file PROPERTY FOLDER "Scripts")
    install(FILES "${CMAKE_CURRENT_BINARY_DIR}/include/CLI11.hpp"
        DESTINATION include)
    add_library(CLI11_SINGLE INTERFACE)
    target_link_libraries(CLI11_SINGLE INTERFACE CLI11)
    add_dependencies(CLI11_SINGLE CLI11-generate-single-file)
    target_compile_definitions(CLI11_SINGLE INTERFACE -DCLI11_SINGLE_FILE)
    target_include_directories(CLI11_SINGLE INTERFACE
        $<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/include/>
        $<INSTALL_INTERFACE:include>)
endif()


if(CLI11_BUILD_TESTS)
  add_subdirectory(tests)
endif()

if(CLI11_BUILD_EXAMPLES)
  add_subdirectory(examples)
endif()

if(CLI11_BUILD_DOCS)
  add_subdirectory(docs)
endif()

# From a build system, this might not be included.
if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME AND EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/book")
    add_subdirectory(book)
endif()

# Packaging support
set(CPACK_PACKAGE_VENDOR "github.com/CLIUtils/CLI11")
set(CPACK_PACKAGE_CONTACT "https://${CPACK_PACKAGE_VENDOR}")
set(CPACK_PACKAGE_VERSION_MAJOR ${PROJECT_VERSION_MAJOR}) # Automatic in CMake 3.12+
set(CPACK_PACKAGE_VERSION_MINOR ${PROJECT_VERSION_MINOR}) # Automatic in CMake 3.12+
set(CPACK_PACKAGE_VERSION_PATCH ${PROJECT_VERSION_PATCH}) # Automatic in CMake 3.12+
set(CPACK_PACKAGE_DESCRIPTION_SUMMARY "Command line parser with simple and intuitive interface")
set(CPACK_RESOURCE_FILE_LICENSE "${CMAKE_CURRENT_SOURCE_DIR}/LICENSE")
set(CPACK_RESOURCE_FILE_README "${CMAKE_CURRENT_SOURCE_DIR}/README.md")
set(CPACK_PACKAGE_DESCRIPTION_FILE "${CMAKE_CURRENT_SOURCE_DIR}/CLI11.CPack.Description.txt")
set(CPACK_SOURCE_GENERATOR "TGZ;ZIP")

# CPack collects *everything* except what's listed here.
set(CPACK_SOURCE_IGNORE_FILES
    /.git
    /dist
    /.*build.*
    /\\\\.DS_Store
    /.*\\\\.egg-info
    /var
    /azure-pipelines.yml
    /.ci
    /docs
    /examples
    /test_package
    /book
    /.travis.yml
    .swp
    /.all-contributorsrc
    /.appveyor.yml
    /.pre-commit.*yaml
)

set(CPACK_DEBIAN_PACKAGE_ARCHITECTURE "all")
set(CPACK_DEBIAN_COMPRESSION_TYPE "xz")
set(CPACK_DEBIAN_PACKAGE_NAME "libcli11-dev")

include(CPack)