include(FetchContent)

if(NOT DEFINED EIGEN_REPO)
    set(EIGEN_REPO https://gitlab.com/libeigen/eigen.git)
endif ()

FetchContent_Declare(
        eigen
        EXCLUDE_FROM_ALL
        GIT_REPOSITORY ${EIGEN_REPO}
        GIT_TAG 5.0.0
        GIT_SHALLOW TRUE
        OVERRIDE_FIND_PACKAGE
)
set(EIGEN_BUILD_DOC OFF CACHE BOOL "" FORCE)
set(BUILD_TESTING OFF CACHE BOOL "" FORCE)
set(EIGEN_BUILD_PKGCONFIG OFF CACHE BOOL "" FORCE)
FetchContent_MakeAvailable(eigen)

if(NOT EXISTS ${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/eigen3-config.cmake AND
   NOT EXISTS ${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/Eigen3Config.cmake)
  file(WRITE ${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/eigen3-config.cmake
[=[
include(CMakeFindDependencyMacro)
find_dependency(eigen)
]=])
endif()

if(NOT EXISTS ${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/eigen3-config-version.cmake AND
   NOT EXISTS ${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/Eigen3ConfigVersion.cmake)
  file(WRITE ${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/eigen3-config-version.cmake
[=[
include(${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/eigen-config-version.cmake OPTIONAL)
if(NOT PACKAGE_VERSION_COMPATIBLE)
  include(${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/eigenConfigVersion.cmake OPTIONAL)
endif()
]=])
endif()