message(STATUS "CMake version: ${CMAKE_VERSION}")

cmake_minimum_required(VERSION 2.8.12)

# Determine if fmt is built as a subproject (using add_subdirectory)
# or if it is the master project.
set(MASTER_PROJECT OFF)
if (CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
  set(MASTER_PROJECT ON)
endif ()

# Joins arguments and places the results in ${result_var}.
function(join result_var)
  set(result )
  foreach (arg ${ARGN})
    set(result "${result}${arg}")
  endforeach ()
  set(${result_var} "${result}" PARENT_SCOPE)
endfunction()

# Set the default CMAKE_BUILD_TYPE to Release.
# This should be done before the project command since the latter can set
# CMAKE_BUILD_TYPE itself (it does so for nmake).
if (NOT CMAKE_BUILD_TYPE)
  join(doc "Choose the type of build, options are: None(CMAKE_CXX_FLAGS or "
           "CMAKE_C_FLAGS used) Debug Release RelWithDebInfo MinSizeRel.")
  set(CMAKE_BUILD_TYPE Release CACHE STRING ${doc})
endif ()

option(FMT_PEDANTIC "Enable extra warnings and expensive tests." OFF)

# Options that control generation of various targets.
option(FMT_DOC "Generate the doc target." ${MASTER_PROJECT})
option(FMT_INSTALL "Generate the install target." ${MASTER_PROJECT})
option(FMT_TEST "Generate the test target." ${MASTER_PROJECT})
option(FMT_USE_CPP14 "Enable the addition of C++14 compiler flags." ON)

project(FMT)

# Get version from core.h
file(READ include/fmt/core.h core_h)
if (NOT core_h MATCHES "FMT_VERSION ([0-9]+)([0-9][0-9])([0-9][0-9])")
  message(FATAL_ERROR "Cannot get FMT_VERSION from core.h.")
endif ()
# Use math to skip leading zeros if any.
math(EXPR CPACK_PACKAGE_VERSION_MAJOR ${CMAKE_MATCH_1})
math(EXPR CPACK_PACKAGE_VERSION_MINOR ${CMAKE_MATCH_2})
math(EXPR CPACK_PACKAGE_VERSION_PATCH ${CMAKE_MATCH_3})
join(FMT_VERSION ${CPACK_PACKAGE_VERSION_MAJOR}.${CPACK_PACKAGE_VERSION_MINOR}.
                 ${CPACK_PACKAGE_VERSION_PATCH})
message(STATUS "Version: ${FMT_VERSION}")

message(STATUS "Build type: ${CMAKE_BUILD_TYPE}")

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH}
  "${CMAKE_CURRENT_SOURCE_DIR}/support/cmake")

include(cxx14)

if (CMAKE_COMPILER_IS_GNUCXX OR (CMAKE_CXX_COMPILER_ID MATCHES "Clang"))
  set(PEDANTIC_COMPILE_FLAGS -Wall -Wextra -Wshadow -pedantic)
endif ()

if (MASTER_PROJECT AND CMAKE_GENERATOR MATCHES "Visual Studio")
  # If Microsoft SDK is installed create script run-msbuild.bat that
  # calls SetEnv.cmd to set up build environment and runs msbuild.
  # It is useful when building Visual Studio projects with the SDK
  # toolchain rather than Visual Studio.
  include(FindSetEnv)
  if (WINSDK_SETENV)
    set(MSBUILD_SETUP "call \"${WINSDK_SETENV}\"")
  endif ()
  # Set FrameworkPathOverride to get rid of MSB3644 warnings.
  set(netfxpath "C:\\Program Files\\Reference Assemblies\\Microsoft\\Framework\\.NETFramework\\v4.0")
  file(WRITE run-msbuild.bat "
    ${MSBUILD_SETUP}
    ${CMAKE_MAKE_PROGRAM} -p:FrameworkPathOverride=\"${netfxpath}\" %*")
endif ()

include(CheckSymbolExists)
if (WIN32)
  check_symbol_exists(open io.h HAVE_OPEN)
else ()
  check_symbol_exists(open fcntl.h HAVE_OPEN)
endif ()

function(add_headers VAR)
  set(headers ${${VAR}})
  foreach (header ${ARGN})
    set(headers ${headers} include/fmt/${header})
  endforeach()
  set(${VAR} ${headers} PARENT_SCOPE)
endfunction()

# Define the fmt library, its includes and the needed defines.
# format.cc is added to FMT_HEADERS for the header-only configuration.
add_headers(FMT_HEADERS core.h format.h format.cc locale.h ostream.h printf.h
                        time.h)
if (HAVE_OPEN)
  add_headers(FMT_HEADERS posix.h)
  add_headers(FMT_SOURCES posix.cc)
endif ()

add_library(fmt ${FMT_SOURCES} ${FMT_HEADERS} README.rst ChangeLog.rst)

option(FMT_CPPFORMAT "Build cppformat library for backward compatibility." OFF)
if (FMT_CPPFORMAT)
  message(WARNING "The cppformat library is deprecated, use fmt instead.")
  add_library(cppformat ${FMT_SOURCES} ${FMT_HEADERS})
endif ()

# Starting with CMake 3.1 the CXX_STANDARD property can be used instead.
target_compile_options(fmt PUBLIC ${CPP14_FLAG})
if (FMT_PEDANTIC)
  target_compile_options(fmt PRIVATE ${PEDANTIC_COMPILE_FLAGS})
endif ()

target_include_directories(fmt PUBLIC
  $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
  $<INSTALL_INTERFACE:include>)

set_target_properties(fmt PROPERTIES
  VERSION ${FMT_VERSION} SOVERSION ${CPACK_PACKAGE_VERSION_MAJOR})

if (BUILD_SHARED_LIBS)
  if (UNIX AND NOT APPLE)
    # Fix rpmlint warning:
    # unused-direct-shlib-dependency /usr/lib/libformat.so.1.1.0 /lib/libm.so.6.
    target_link_libraries(fmt -Wl,--as-needed)
  endif ()
  target_compile_definitions(fmt PRIVATE FMT_EXPORT INTERFACE FMT_SHARED)
endif ()

# Additionally define a header-only library when CMake is new enough.
if (CMAKE_VERSION VERSION_GREATER 3.1.0 OR CMAKE_VERSION VERSION_EQUAL 3.1.0)
  add_library(fmt-header-only INTERFACE)

  target_compile_definitions(fmt-header-only INTERFACE FMT_HEADER_ONLY=1)

  target_include_directories(fmt-header-only INTERFACE
    $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
    $<INSTALL_INTERFACE:include>)
endif ()

# Install targets.
if (FMT_INSTALL)
  include(CMakePackageConfigHelpers)
  set(FMT_CMAKE_DIR lib/cmake/fmt CACHE STRING
    "Installation directory for cmake files, relative to ${CMAKE_INSTALL_PREFIX}.")
  set(version_config ${PROJECT_BINARY_DIR}/fmt-config-version.cmake)
  set(project_config ${PROJECT_BINARY_DIR}/fmt-config.cmake)
  set(targets_export_name fmt-targets)

  set (INSTALL_TARGETS fmt)
  if (TARGET fmt-header-only)
    set(INSTALL_TARGETS ${INSTALL_TARGETS} fmt-header-only)
  endif ()

  set(FMT_LIB_DIR lib CACHE STRING
    "Installation directory for libraries, relative to ${CMAKE_INSTALL_PREFIX}.")

  # Generate the version, config and target files into the build directory.
  write_basic_package_version_file(
    ${version_config}
    VERSION ${FMT_VERSION}
    COMPATIBILITY AnyNewerVersion)
  configure_package_config_file(
    ${PROJECT_SOURCE_DIR}/support/cmake/fmt-config.cmake.in
    ${project_config}
    INSTALL_DESTINATION ${FMT_CMAKE_DIR})
  export(TARGETS ${INSTALL_TARGETS}
         FILE ${PROJECT_BINARY_DIR}/${targets_export_name}.cmake)

  # Install version, config and target files.
  install(
    FILES ${project_config} ${version_config}
    DESTINATION ${FMT_CMAKE_DIR})
  install(EXPORT ${targets_export_name} DESTINATION ${FMT_CMAKE_DIR})

  # Install the library and headers.
  install(TARGETS ${INSTALL_TARGETS} EXPORT ${targets_export_name}
          DESTINATION ${FMT_LIB_DIR})
  install(FILES ${FMT_HEADERS} DESTINATION include/fmt)
  if (FMT_CPPFORMAT)
    install(TARGETS cppformat DESTINATION ${FMT_LIB_DIR})
  endif ()
endif ()

if (FMT_DOC)
  add_subdirectory(doc)
endif ()

if (FMT_TEST)
  enable_testing()
  add_subdirectory(test)
endif ()

set(gitignore ${PROJECT_SOURCE_DIR}/.gitignore)
if (MASTER_PROJECT AND EXISTS ${gitignore})
  # Get the list of ignored files from .gitignore.
  file (STRINGS ${gitignore} lines)
  LIST(REMOVE_ITEM lines /doc/html)
  foreach (line ${lines})
    string(REPLACE "." "[.]" line "${line}")
    string(REPLACE "*" ".*" line "${line}")
    set(ignored_files ${ignored_files} "${line}$" "${line}/")
  endforeach ()
  set(ignored_files ${ignored_files}
    /.git /breathe /format-benchmark sphinx/ .buildinfo .doctrees)

  set(CPACK_SOURCE_GENERATOR ZIP)
  set(CPACK_SOURCE_IGNORE_FILES ${ignored_files})
  set(CPACK_SOURCE_PACKAGE_FILE_NAME fmt-${FMT_VERSION})
  set(CPACK_PACKAGE_NAME fmt)
  set(CPACK_RESOURCE_FILE_README ${PROJECT_SOURCE_DIR}/README.rst)
  include(CPack)
endif ()