Add Cmake install and find_package support

CMakeLists.txt

@@ -3,10 +3,11 @@
 
 cmake_minimum_required(VERSION 3.25)
 
-project(maddy)
+project(maddy VERSION 1.5.0)
 
 # ------------------------------------------------------------------------------
 
+include(GNUInstallDirs)
 set(CMAKE_BINARY_DIR ${CMAKE_CURRENT_SOURCE_DIR}/build)
 set(EXECUTABLE_OUTPUT_PATH ${CMAKE_BINARY_DIR})
 set(LIBRARY_OUTPUT_PATH ${CMAKE_BINARY_DIR})
@@ -41,7 +42,8 @@ endif()
 
 add_library(maddy INTERFACE)
 target_include_directories(maddy INTERFACE
-  ${MADDY_INCLUDE_DIR}
+  $<BUILD_INTERFACE:${MADDY_INCLUDE_DIR}>
+  $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
 )
 
 # ------------------------------------------------------------------------------
@@ -64,3 +66,32 @@ if(${MADDY_CREATE_PACKAGE})
     DEPENDS ${MADDY_PACKAGE_FILES})
   add_custom_target(${PROJECT_NAME}_package DEPENDS ${CMAKE_BINARY_DIR}/${PROJECT_NAME}-src.zip)
 endif()
+
+
+include(CMakePackageConfigHelpers)
+
+install(DIRECTORY include/
+  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+)
+install(TARGETS ${PROJECT_NAME}
+    EXPORT ${PROJECT_NAME}Targets
+    INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+)
+install(EXPORT ${PROJECT_NAME}Targets
+    FILE ${PROJECT_NAME}Targets.cmake
+    NAMESPACE ${PROJECT_NAME}::
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}
+)
+write_basic_package_version_file(${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
+    VERSION ${PROJECT_VERSION}
+    COMPATIBILITY SameMinorVersion
+)
+configure_package_config_file(${CMAKE_CURRENT_SOURCE_DIR}/cmake/${PROJECT_NAME}Config.cmake.in
+    ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake
+    INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}
+)
+install(FILES
+        ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake
+        ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}
+)