# This script tries to locate the YAHAL root
# folder and reads the YAHAL_init.cmake file.

# Check if we can get the path from a environment variable
if (DEFINED ENV{YAHAL_DIR} AND (NOT YAHAL_DIR))
    set(YAHAL_DIR $ENV{YAHAL_DIR})
    message("Using YAHAL_DIR from environment ('${YAHAL_DIR}')")
endif()

# Check if we need to locate the YAHAL root directory
if (NOT YAHAL_DIR)
    message("Trying to find YAHAL ...")
    find_path(YAHAL_DIR .yahal_version . .. ../.. ../../.. ../../../..)
endif ()

# Try to resolve a relative path
get_filename_component(YAHAL_DIR "${YAHAL_DIR}" REALPATH BASE_DIR "${CMAKE_CURRENT_LIST_DIR}")
if (NOT EXISTS ${YAHAL_DIR})
    message(FATAL_ERROR "Directory '${YAHAL_DIR}' not found")
endif ()

# Check if YAHAL_DIR points to the correct folder.
set(YAHAL_INIT_CMAKE_FILE ${YAHAL_DIR}/cmake/YAHAL_init.cmake)
if (NOT EXISTS ${YAHAL_INIT_CMAKE_FILE})
    message(FATAL_ERROR "Directory '${YAHAL_DIR}' does not appear to be a YAHAL root folder")
endif ()

# Finally include the init-script
include(${YAHAL_INIT_CMAKE_FILE})