# CMAKE REFERENCE
#   - intro: https://codingnest.com/basic-cmake/
#   - best practices (3.0+): https://gist.github.com/mbinna/c61dbb39bca0e4fb7d1f73b0d66a4fd1
#   - pitfalls: https://izzys.casa/2019/02/everything-you-never-wanted-to-know-about-cmake/
#   - troubleshooting:
#     - variable_watch https://cmake.org/cmake/help/latest/command/variable_watch.html
#     - verbose output: cmake --build build --verbose

# Version should match the tested CMAKE_URL in .github/workflows/build.yml.
cmake_minimum_required(VERSION 3.16)

project(nvim C)

if(POLICY CMP0135)
  cmake_policy(SET CMP0135 NEW)
endif()

if(XCODE)
  message(FATAL_ERROR [[Xcode generator is not supported. Use "Ninja" or "Unix Makefiles" instead]])
endif()

# Point CMake at any custom modules we may ship
list(APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake")

include(CheckCCompilerFlag)
include(CheckCSourceCompiles)
include(CheckLibraryExists)
include(ExternalProject)
include(FindPackageHandleStandardArgs)
include(GNUInstallDirs)

include(Deps)
include(Find)
include(InstallHelpers)
include(PreventInTreeBuilds)
include(Util)

if(NOT PROJECT_SOURCE_DIR STREQUAL PROJECT_BINARY_DIR)
  # Auto-create a .gitignore in the specified "build" directory.
  file(GENERATE OUTPUT .gitignore CONTENT "*")
endif()

#-------------------------------------------------------------------------------
# User settings
#-------------------------------------------------------------------------------

set(DEPS_IGNORE_SHA FALSE)

#-------------------------------------------------------------------------------
# Variables
#-------------------------------------------------------------------------------
set(FUNCS_DATA ${PROJECT_BINARY_DIR}/funcs_data.mpack)
set(TOUCHES_DIR ${PROJECT_BINARY_DIR}/touches)
set(VTERM_TEST_FILE ${PROJECT_BINARY_DIR}/test/vterm_test_output)

file(GLOB DOCFILES CONFIGURE_DEPENDS ${PROJECT_SOURCE_DIR}/runtime/doc/*.txt)

if(NOT CI_BUILD)
  set(CMAKE_INSTALL_MESSAGE NEVER)
endif()

if(${CMAKE_VERSION} VERSION_LESS 3.20)
  set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
endif()

if(${CMAKE_VERSION} VERSION_GREATER_EQUAL 3.26)
  set(COPY_DIRECTORY copy_directory_if_different)
else()
  set(COPY_DIRECTORY copy_directory)
endif()

# Prefer our bundled versions of dependencies.
if(DEFINED ENV{DEPS_BUILD_DIR})
  set(DEPS_PREFIX "$ENV{DEPS_BUILD_DIR}/usr" CACHE PATH "Path prefix for finding dependencies")
else()
  set(DEPS_PREFIX "${CMAKE_CURRENT_SOURCE_DIR}/.deps/usr" CACHE PATH "Path prefix for finding dependencies")
  # When running from within CLion or Visual Studio,
  # build bundled dependencies automatically.
  if(NOT EXISTS ${DEPS_PREFIX}
     AND (DEFINED ENV{CLION_IDE}
          OR DEFINED ENV{VisualStudioEdition}))
    message(STATUS "Building dependencies...")
    set(DEPS_BUILD_DIR ${PROJECT_BINARY_DIR}/.deps)
    file(MAKE_DIRECTORY ${DEPS_BUILD_DIR})
    execute_process(
      COMMAND ${CMAKE_COMMAND} -G ${CMAKE_GENERATOR}
        -D CMAKE_TOOLCHAIN_FILE=${CMAKE_TOOLCHAIN_FILE}
        -D CMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
        -D CMAKE_C_COMPILER=${CMAKE_C_COMPILER}
        -D CMAKE_C_FLAGS=${CMAKE_C_FLAGS}
        -D CMAKE_C_FLAGS_DEBUG=${CMAKE_C_FLAGS_DEBUG}
        -D CMAKE_C_FLAGS_MINSIZEREL=${CMAKE_C_FLAGS_MINSIZEREL}
        -D CMAKE_C_FLAGS_RELWITHDEBINFO=${CMAKE_C_FLAGS_RELWITHDEBINFO}
        -D CMAKE_C_FLAGS_RELEASE=${CMAKE_C_FLAGS_RELEASE}
        -D CMAKE_MAKE_PROGRAM=${CMAKE_MAKE_PROGRAM}
        ${PROJECT_SOURCE_DIR}/cmake.deps
      WORKING_DIRECTORY ${DEPS_BUILD_DIR})
    execute_process(
      COMMAND ${CMAKE_COMMAND} --build ${DEPS_BUILD_DIR}
        --config ${CMAKE_BUILD_TYPE})
    set(DEPS_PREFIX ${DEPS_BUILD_DIR}/usr)
  endif()
endif()

list(INSERT CMAKE_PREFIX_PATH 0 ${DEPS_PREFIX})

if(APPLE)
  # If the macOS deployment target is not set manually (via $MACOSX_DEPLOYMENT_TARGET),
  # fall back to local system version. Needs to be done both here and in cmake.deps.
  if(NOT CMAKE_OSX_DEPLOYMENT_TARGET)
    execute_process(COMMAND sw_vers -productVersion