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# Find if a Python module is installed

# Found at http://www.cmake.org/pipermail/cmake/2011-January/041666.html

# To use do: find_python_module(PyQt4 REQUIRED)

function(find_python_module module)

string(TOUPPER ${module} module_upper)

if(NOT PY_${module_upper})

if(ARGC GREATER 1 AND ARGV1 STREQUAL "REQUIRED")

set(${module}_FIND_REQUIRED TRUE)

else()

set(${module}_FIND_REQUIRED FALSE)

endif()

# A module's location is usually a directory, but for binary modules

# it's a .so file.

execute_process(COMMAND "${PYTHON_EXECUTABLE}" "-c"

"import re, ${module}; print(re.compile('/__init__.py.*').sub('',${module}.__file__))"

RESULT_VARIABLE _${module}_status

OUTPUT_VARIABLE _${module}_location

ERROR_QUIET

OUTPUT_STRIP_TRAILING_WHITESPACE)

if(NOT _${module}_status)

set(PY_${module_upper} ${_${module}_location} CACHE STRING

"Location of Python module ${module}")

endif(NOT _${module}_status)

endif(NOT PY_${module_upper})

find_package_handle_standard_args(PY_${module} DEFAULT_MSG PY_${module_upper})

if(NOT PY_${module_upper}_FOUND AND ${module}_FIND_REQUIRED)

message(FATAL_ERROR "python module ${module} is not found")

endif()

execute_process(COMMAND "${PYTHON_EXECUTABLE}" "-c"

"import sys, ${module}; sys.stdout.write(${module}.__version__)"

OUTPUT_VARIABLE _${module}_version

RESULT_VARIABLE _${module}_status

ERROR_QUIET

OUTPUT_STRIP_TRAILING_WHITESPACE)

if(NOT _${module}_status)

set(PY_${module_upper}_VERSION ${_${module}_version} CACHE STRING

"Version of Python module ${module}")

endif(NOT _${module}_status)

set(PY_${module_upper}_FOUND ${PY_${module_upper}_FOUND} PARENT_SCOPE)

set(PY_${module_upper}_VERSION ${PY_${module_upper}_VERSION} PARENT_SCOPE)

endfunction(find_python_module)