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function(find_python_module MODULE PREFIX)
execute_process(
COMMAND ${PYTHON_EXECUTABLE} -c "import sys, ${MODULE}; sys.stdout.write(${MODULE}.__version__)"
OUTPUT_VARIABLE _version
RESULT_VARIABLE _status
ERROR_QUIET
OUTPUT_STRIP_TRAILING_WHITESPACE
)
# Export version variables to parent scope. This is needed by
# find_package_handle_standard_args
set(${PREFIX}_VERSION_STRING ${_version} PARENT_SCOPE)
# A status returns 0 if everything is okay. And zero is false. To make
# checking in the outer scope less surprising
if (_status EQUAL 0)
set("${PREFIX}_STATUS" "success" PARENT_SCOPE)
endif (_status EQUAL 0)
endfunction(find_python_module MODULE PREFIX)
# This macro provides a simple way for basic python find modules to be
# extremely simple without duplicate boilerplate
macro(basic_python_module MODULE PREFIX)
find_python_module("${MODULE}" "${PREFIX}")
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(
"${PREFIX}"
REQUIRED_VARS "${PREFIX}_STATUS"
VERSION_VAR "${PREFIX}_VERSION_STRING"
)
# This isn't needed in the parent scope, just here.
unset("${PREFIX}_STATUS")
endmacro(basic_python_module MODULE PREFIX)
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