FIX: Add a script to set PYTHONPATH for Pythin API doc generation

Documentation/Cookbook/CMake/RunPythonApiRstGenerator.sh.cmake.in

+#!/bin/sh
+#
+# Copyright (C) 2005-2020 Centre National d'Etudes Spatiales (CNES)
+#
+# This file is part of Orfeo Toolbox
+#
+#     https://www.orfeo-toolbox.org/
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+#cmake builds with rpath in the binary dir, so we don't need to set LD_LIBRARY_PATH here
+#export LD_LIBRARY_PATH=@CMAKE_BINARY_DIR@/lib:$LD_LIBRARY_PATH
+export PYTHONPATH=@CMAKE_BINARY_DIR@/lib/otb/python:$PYTHONPATH
+export OTB_APPLICATION_PATH=@CMAKE_BINARY_DIR@/lib/otb/applications
+
+python3 @CMAKE_CURRENT_SOURCE_DIR@/Scripts/otbGeneratePythonApiRstDoc.py "$1"

Documentation/Cookbook/CMakeLists.txt

@@ -92,6 +92,12 @@ configure_file(${CMAKE_CURRENT_SOURCE_DIR}/CMake/RunApplicationsRstGenerator.sh.
   ${CMAKE_CURRENT_BINARY_DIR}/RunApplicationsRstGenerator.sh
   @ONLY)
 
+execute_process(COMMAND ${CMAKE_COMMAND} -E remove ${CMAKE_CURRENT_BINARY_DIR}/RunPythonApiRstGenerator.sh)
+
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/CMake/RunPythonApiRstGenerator.sh.cmake.in
+  ${CMAKE_CURRENT_BINARY_DIR}/RunPythonApiRstGenerator.sh
+  @ONLY)
+
 file(COPY ${RST_SOURCE_DIR}  DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
 
 file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/Art DESTINATION  ${RST_BINARY_DIR})
@@ -118,8 +124,8 @@ add_custom_target(generate_otbapps_rst
   DEPENDS OTBSWIGWrapper-all
   )
 
-add_custom_target(generate_pythonapy_rst
-  COMMAND python3 ${CMAKE_CURRENT_SOURCE_DIR}/Scripts/otbGeneratePythonApiRstDoc.py
+add_custom_target(generate_pythonapi_rst
+  COMMAND ${SH_INTERP} ${CMAKE_CURRENT_BINARY_DIR}/RunPythonApiRstGenerator.sh
   ${RST_BINARY_DIR}
   WORKING_DIRECTORY ${RST_BINARY_DIR}
   COMMENT "Auto-generating Python Api Documentation in RST"
@@ -153,7 +159,7 @@ add_custom_target(CookBookHTML
   -c ${SPHINX_CONF_DIR}
   WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
   DEPENDS generate_otbapps_rst
-  DEPENDS generate_pythonapy_rst
+  DEPENDS generate_pythonapi_rst
   DEPENDS generate_examples_rst
   COMMENT "Building RST documentation in html")