FreeCAD

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# - Find the matplotlib libraries
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# This module finds IF matplotlib is installed, and sets the following variables
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# indicating where it is.
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#
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#  MATPLOTLIB_FOUND            - was matplotlib found
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#  MATPLOTLIB_VERSION          - the version of matplotlib found as a string
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#  MATPLOTLIB_VERSION_MAJOR    - the major version number of matplotlib
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#  MATPLOTLIB_VERSION_MINOR    - the minor version number of matplotlib
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#  MATPLOTLIB_VERSION_PATCH    - the patch version number of matplotlib
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#  MATPLOTLIB_PATH_DIRS        - path to the matplotlib include files
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IF(Python3_Interpreter_FOUND)
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    # Try to import matplotlib into Python interpreter. Python
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    # interpreter was found previously as required package, so
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    # don't take care about this.
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    execute_process(COMMAND "${PYTHON_EXECUTABLE}" "-c"
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        "import matplotlib as m; print(m.__version__); print(m.__path__[0]);"
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        RESULT_VARIABLE _MATPLOTLIB_SEARCH_SUCCESS
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        OUTPUT_VARIABLE _MATPLOTLIB_VALUES
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        ERROR_VARIABLE _MATPLOTLIB_ERROR_VALUE
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        OUTPUT_STRIP_TRAILING_WHITESPACE)
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    IF(_MATPLOTLIB_SEARCH_SUCCESS MATCHES 0)
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        set(MATPLOTLIB_FOUND TRUE)
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        # Convert the process output into a list
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        string(REGEX REPLACE ";" "\\\\;" _MATPLOTLIB_VALUES ${_MATPLOTLIB_VALUES})
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        string(REGEX REPLACE "\n" ";" _MATPLOTLIB_VALUES ${_MATPLOTLIB_VALUES})
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        list(GET _MATPLOTLIB_VALUES 0 MATPLOTLIB_VERSION)
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        list(GET _MATPLOTLIB_VALUES 1 MATPLOTLIB_PATH_DIRS)
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        # Make sure all directory separators are '/'
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        string(REGEX REPLACE "\\\\" "/" MATPLOTLIB_PATH_DIRS ${MATPLOTLIB_PATH_DIRS})
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        # Get the major and minor version numbers
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        string(REGEX REPLACE "\\." ";" _MATPLOTLIB_VERSION_LIST ${MATPLOTLIB_VERSION})
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        list(GET _MATPLOTLIB_VERSION_LIST 0 MATPLOTLIB_VERSION_MAJOR)
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        list(GET _MATPLOTLIB_VERSION_LIST 1 MATPLOTLIB_VERSION_MINOR)
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        list(GET _MATPLOTLIB_VERSION_LIST 2 MATPLOTLIB_VERSION_PATCH)
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    ELSE()
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        set(MATPLOTLIB_FOUND FALSE)
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    ENDIF()
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ELSE()
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    set(MATPLOTLIB_FOUND FALSE)
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ENDIF()
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