install LAMMPS python module with either install-python or install target if...

)

###############################################################################

# Install LAMMPS module into site-packages folder

# Only available, if a shared library is built

# Install LAMMPS lib and python module into site-packages folder with

# "install-python" target.  Behaves exactly like "make install-python" for

# conventional build.  Only available, if a shared library is built.

# This is primarily for people that only want to use the Python wrapper.

###############################################################################

if(BUILD_LIB AND BUILD_SHARED_LIBS)

  find_package(PythonInterp)

  if (${PYTHONINTERP_FOUND})

    add_custom_target(

      install-python

      ${PYTHON_EXECUTABLE} install.py -v ${LAMMPS_SOURCE_DIR}/version.h

      -m ${CMAKE_CURRENT_SOURCE_DIR}/../python/lammps.py

      -l ${CMAKE_BINARY_DIR}/liblammps${CMAKE_SHARED_LIBRARY_SUFFIX}

      WORKING_DIRECTORY  ${CMAKE_CURRENT_SOURCE_DIR}/../python

    COMMENT "Installing LAMMPS Python module"

    )

      COMMENT "Installing LAMMPS Python module")

  else()

    add_custom_target(

      install-python

      echo "Must have Python installed to install the LAMMPS Python module")

  endif()

else()

  add_custom_target(

    install-python

    echo "Installation of the LAMMPS Python module requires building the LAMMPS shared library")

    echo "Must build LAMMPS as a shared library to use the Python module")

endif()

###############################################################################

# Add LAMMPS python module to "install" target. This is taylored for building

# LAMMPS for package managers and with different prefix settings.

# This requires either a shared library or that the PYTHON package is included.

###############################################################################

if((BUILD_LIB AND BUILD_SHARED_LIBS) OR (PKG_PYTHON))

  find_package(PythonInterp)

  if (${PYTHONINTERP_FOUND})

    if(NOT PYTHON_INSTDIR)

      execute_process(COMMAND ${PYTHON_EXECUTABLE}

        -c "import distutils.sysconfig as cg; print(cg.get_python_lib(1,0,prefix='${CMAKE_INSTALL_PREFIX}'))"

        OUTPUT_VARIABLE PYTHON_INSTDIR OUTPUT_STRIP_TRAILING_WHITESPACE)

    endif()

    install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/../python/lammps.py DESTINATION ${PYTHON_INSTDIR})

  endif()

endif()

###############################################################################