Update ConanHandle.cmake

cmake/ConanHandle.cmake

@@ -1,22 +1,24 @@
 include_guard(GLOBAL)
 set(ENV{CONAN_HOME} "${CMAKE_CURRENT_SOURCE_DIR}/.conan")
+set(ENV{VIRTUAL_ENV} "$ENV{CONAN_HOME}/.venv")
+set(Python3_FIND_VIRTUALENV ONLY)
 set(_CONAN_BUILD_ROOT_PATH "$ENV{CONAN_HOME}/build")
-find_package(Python3 COMPONENTS Interpreter REQUIRED)
-cmake_path(GET Python3_EXECUTABLE PARENT_PATH _PYTHON_ROOT_PATH)
-set(_PIP_SCRIPT_ROOT_PATH "${_PYTHON_ROOT_PATH}/Scripts")
-find_program(_CONAN_EXEC "conan" HINTS "${_PIP_SCRIPT_ROOT_PATH}")
-set(_PIP_BREAK_SYSTEM_PACKAGES "")
-if("${CMAKE_HOST_SYSTEM_NAME}" MATCHES "Darwin")
-  set(_PIP_BREAK_SYSTEM_PACKAGES "--break-system-packages")
+find_package(Python3 COMPONENTS Interpreter)
+if(NOT Python3_EXECUTABLE)
+  set(Python3_FIND_VIRTUALENV STANDARD)
+  find_package(Python3 COMPONENTS Interpreter REQUIRED)
+  execute_process(COMMAND ${Python3_EXECUTABLE} "-m" "venv" "$ENV{VIRTUAL_ENV}")
+  unset(Python3_EXECUTABLE)
+  set(Python3_FIND_VIRTUALENV ONLY)
+  find_package(Python3 COMPONENTS Interpreter REQUIRED)
 endif()
+find_program(_CONAN_EXEC "conan" HINTS "$ENV{VIRTUAL_ENV}/Scripts" NO_DEFAULT_PATH)
 if(NOT EXISTS "${_CONAN_EXEC}")
   execute_process(
-    COMMAND ${Python3_EXECUTABLE} "-m" "pip" "install" "conan" "--no-warn-script-location"
-            "${_PIP_BREAK_SYSTEM_PACKAGES}" COMMAND_ERROR_IS_FATAL LAST
+    COMMAND ${Python3_EXECUTABLE} "-m" "pip" "install" "conan" "--no-warn-script-location" COMMAND_ERROR_IS_FATAL LAST
   )
-  find_program(_CONAN_EXEC "conan" HINTS "${_PIP_SCRIPT_ROOT_PATH}" REQUIRED)
+  find_program(_CONAN_EXEC "conan" HINTS "$ENV{VIRTUAL_ENV}/Scripts" REQUIRED)
 endif()
-
 set(_CONAN_PROFILE_FILE_PATH "$ENV{CONAN_HOME}/profiles/default")
 if(NOT EXISTS "${_CONAN_PROFILE_FILE_PATH}")
   execute_process(COMMAND ${_CONAN_EXEC} "profile" "detect" COMMAND_ERROR_IS_FATAL LAST)