python: Support building of both python2 & python3 bindings

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

src/python/CMakeLists.txt

@@ -1,50 +1,5 @@
-find_package (PythonLibs ${PYTHONBUILD_VERSION} REQUIRED)
+set_source_files_properties (mraapython.i PROPERTIES CPLUSPLUS ON)
+set_source_files_properties (mraapython.i PROPERTIES SWIG_FLAGS "-I${CMAKE_BINARY_DIR}/src")
 
-include_directories(
-  ${CMAKE_CURRENT_SOURCE_DIR}/..
-  ${PYTHON_INCLUDE_DIRS}
-)
-
-set_source_files_properties (mraa.i PROPERTIES CPLUSPLUS ON)
-set_source_files_properties (mraa.i PROPERTIES SWIG_FLAGS "-I${CMAKE_BINARY_DIR}/src")
-swig_add_module (python-mraa python mraa.i mraapy.c)
-swig_link_libraries (python-mraa ${PYTHON_LIBRARIES} mraa)
-
-if (DOXYGEN_FOUND)
-  foreach (_file ${DOCCLASSES})
-    add_dependencies (${SWIG_MODULE_python-mraa_REAL_NAME} ${_file}class_doc_i)
-  endforeach ()
-  add_dependencies (${SWIG_MODULE_python-mraa_REAL_NAME} common_hpp_doc_i)
-
-  add_custom_target (pydoc
-    pydoc -w ${CMAKE_CURRENT_BINARY_DIR}/mraa.py ${CMAKE_CURRENT_BINARY_DIR}/
-    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-    COMMENT "Generating API documentation with pydoc" VERBATIM
-  )
-endif ()
-
-set_target_properties (${SWIG_MODULE_python-mraa_REAL_NAME} PROPERTIES
-  OUTPUT_NAME _mraa
-  COMPILE_FLAGS "${CMAKE_C_FLAGS} -DSWIGPYTHON=${SWIG_FOUND}"
-)
-
-execute_process (
-   COMMAND ${PYTHON_EXECUTABLE} -c
-       "import site, sys; sys.stdout.write(site.PREFIXES[-1])"
-   OUTPUT_VARIABLE PYTHON_PREFIX
-)
-file (TO_CMAKE_PATH "${PYTHON_PREFIX}" PYTHON_PREFIX)
-execute_process (
-   COMMAND ${PYTHON_EXECUTABLE} -c
-       "import site, sys; sys.stdout.write(site.getusersitepackages().replace(site.getuserbase(), site.PREFIXES[-1]))"
-   OUTPUT_VARIABLE PYTHON_SITE_DIR
-)
-file (TO_CMAKE_PATH "${PYTHON_SITE_DIR}" PYTHON_SITE_DIR)
-string (REGEX REPLACE "^${PYTHON_PREFIX}/" ""
-   PYTHON_SITE_DIR "${PYTHON_SITE_DIR}")
-
-install (FILES ${CMAKE_CURRENT_BINARY_DIR}/_mraa.so
-         ${CMAKE_CURRENT_BINARY_DIR}/mraa.py
-         DESTINATION ${PYTHON_SITE_DIR})
-
-add_subdirectory (docs)
+add_subdirectory (python2)
+add_subdirectory (python3)

src/python/mraapython.i

@@ -1,7 +1,3 @@
-%module(docstring="Python interface to libmraa") mraa
-
-%feature("autodoc", "3");
-
 %include typemaps.i
 %include carrays.i
 

src/python/python2/CMakeLists.txt

@@ -0,0 +1,39 @@
+set_source_files_properties (mraa2.i PROPERTIES CPLUSPLUS ON)
+set_source_files_properties (mraa2.i PROPERTIES SWIG_FLAGS "-I${CMAKE_BINARY_DIR}/src")
+
+if (PYTHON2_LIBRARY)
+    message ("PYTHON2 attempting to build!")
+
+    swig_add_module (python2-mraa python mraa2.i ../mraapy.c)
+    swig_link_libraries (python2-mraa ${PYTHON2_LIBRARIES} mraa)
+    
+    target_include_directories(${SWIG_MODULE_python2-mraa_REAL_NAME}
+      PUBLIC
+      "${CMAKE_CURRENT_SOURCE_DIR}/../.."
+      "${PYTHON2_INCLUDE_DIR}"
+    )
+
+    if (DOXYGEN_FOUND AND PYTHON2_EXECUTABLE)
+      foreach (_file ${DOCCLASSES})
+        add_dependencies (${SWIG_MODULE_python2-mraa_REAL_NAME} ${_file}class_doc_i)
+      endforeach ()
+      add_dependencies (${SWIG_MODULE_python2-mraa_REAL_NAME} common_hpp_doc_i)
+
+      add_custom_target (pydoc
+        pydoc -w ${CMAKE_CURRENT_BINARY_DIR}/mraa.py ${CMAKE_CURRENT_BINARY_DIR}/
+        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+        COMMENT "Generating API documentation with pydoc" VERBATIM
+      )
+    endif ()
+
+    set_target_properties (${SWIG_MODULE_python2-mraa_REAL_NAME} PROPERTIES
+      OUTPUT_NAME _mraa
+      COMPILE_FLAGS "${CMAKE_C_FLAGS} -DSWIGPYTHON=${SWIG_FOUND}"
+    )
+
+    install (FILES ${CMAKE_CURRENT_BINARY_DIR}/_mraa.so
+             ${CMAKE_CURRENT_BINARY_DIR}/mraa.py
+             DESTINATION ${CMAKE_INSTALL_PREFIX}/${PYTHON2_PACKAGES_PATH})
+endif()
+
+add_subdirectory (docs)

src/python/python2/docs/CMakeLists.txt

@@ -36,6 +36,6 @@ if (DOXYGEN_FOUND)
       COMMENT "Building HTML documentation with Sphinx"
     )
 
-    add_dependencies (sphinx ${SWIG_MODULE_python-mraa_REAL_NAME})
+    add_dependencies (sphinx ${SWIG_MODULE_python2-mraa_REAL_NAME})
   endif ()
 endif ()

src/python/python2/mraa2.i

@@ -0,0 +1,5 @@
+%module(docstring="Python interface to libmraa") mraa                                                                                          
+
+%feature("autodoc", "3");
+
+%include ../mraapython.i

src/python/python3/CMakeLists.txt

@@ -0,0 +1,24 @@
+set_source_files_properties (mraa3.i PROPERTIES CPLUSPLUS ON)
+set_source_files_properties (mraa3.i PROPERTIES SWIG_FLAGS "-I${CMAKE_BINARY_DIR}/src")
+
+if (PYTHON3_LIBRARY)
+    message ("PYTHON3 attempting to build!")
+
+    swig_add_module (python3-mraa python mraa3.i ../mraapy.c)
+    swig_link_libraries (python3-mraa ${PYTHON3_LIBRARIES} mraa)
+
+    target_include_directories(${SWIG_MODULE_python3-mraa_REAL_NAME}
+      PUBLIC
+      "${CMAKE_CURRENT_SOURCE_DIR}/../.."
+      "${PYTHON3_INCLUDE_DIR}"
+    )
+
+    set_target_properties (${SWIG_MODULE_python3-mraa_REAL_NAME} PROPERTIES
+      OUTPUT_NAME _mraa
+      COMPILE_FLAGS "${CMAKE_C_FLAGS} -DSWIGPYTHON=${SWIG_FOUND}"
+    )
+
+    install (FILES ${CMAKE_CURRENT_BINARY_DIR}/_mraa.so
+             ${CMAKE_CURRENT_BINARY_DIR}/mraa.py
+             DESTINATION ${CMAKE_INSTALL_PREFIX}/${PYTHON3_PACKAGES_PATH})
+endif ()

src/python/python3/mraa3.i

@@ -0,0 +1,3 @@
+%module(docstring="Python interface to libmraa") mraa
+
+%include ../mraapython.i