[CI] Update the AppVeyor and Travis script to incorporate both scons and cmake builds.

.appveyor.yml

 os:
-  - Visual Studio 2015
+  - Visual Studio 2017
 
 build:
   verbosity: detailed
 
+environment:
+  matrix:
+    - builder: cmake
+    - builder: scons
+
+init:
+  - call "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" amd64
+
 install:
   - SET "PATH=%PYTHON%;%PYTHON%\\Scripts;%PATH%"
   - python --version
@@ -12,10 +20,17 @@ install:
   - pip install -U wheel
   - pip install scons==2.4.1
   - cinst nsis.portable
+  - hg clone https://bitbucket.org/eigen/eigen external\eigen3
+  - cd external\eigen3
+  - mkdir build & cd build
+  - cmake .. -DCMAKE_INSTALL_PREFIX="..\..\build" -DCMAKE_BUILD_TYPE=Release -G "NMake Makefiles"
+  - nmake install
+  - cd ..\..\..\
+  - dir
 
 before_build:
   # BOOST Python require x86 compilation
-  - call "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" amd64
+  #- call "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" amd64
   #- call "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" x86
 
 # Build script
@@ -30,23 +45,33 @@ build_script:
   #- dir C:\Python27\libs
   #- dir C:\Libraries\boost_1_63_0
   #- dir C:\Libraries\boost_1_63_0\lib64-msvc-14.0
-  - scons --cfg=./configs/scons/config-windows-appveyor.py
-  - appveyor PushArtifact config.log
+  - if "%builder%" == "scons" (
+       scons --cfg=./configs/scons/config-windows-appveyor.py &
+       appveyor PushArtifact config.log
+    )
 
   # Install CERES
-  - cd external
-  - git clone https://ceres-solver.googlesource.com/ceres-solver
-  - cd ceres-solver
-  - mkdir build-ceres
-  - cd build-ceres
-  - cmake .. -DBUILD_SHARED_LIBS=ON -DMINIGLOG=ON -DBUILD_TESTING=OFF -DBUILD_EXAMPLES=OFF -DCMAKE_INSTALL_PREFIX="..\..\build" -DEIGEN_INCLUDE_DIR="..\..\build\include" -DCMAKE_BUILD_TYPE=Release -G "NMake Makefiles"
-  - nmake install
-  - cd ..\..\..
+  # - cd external
+  # - git clone https://ceres-solver.googlesource.com/ceres-solver
+  # - cd ceres-solver
+  # - mkdir build-ceres
+  # - cd build-ceres
+  # - cmake .. -DBUILD_SHARED_LIBS=ON -DMINIGLOG=ON -DBUILD_TESTING=OFF -DBUILD_EXAMPLES=OFF -DCMAKE_INSTALL_PREFIX="..\..\build" -DEIGEN_INCLUDE_DIR="..\..\build\include" -DCMAKE_BUILD_TYPE=Release -G "NMake Makefiles"
+  # - nmake install
+  # - cd ..\..\..
+  # - dir
 
   # Rebuild with CERES and Python
-  - scons --cfg=./configs/scons/config-windows-appveyor.py
-  #- scons --cfg=./configs/scons/config-windows-appveyor.py python
-  - appveyor PushArtifact config.log
+  - if "%builder%" == "scons" (
+      scons --cfg=./configs/scons/config-windows-appveyor.py &
+      appveyor PushArtifact config.log
+    ) else (
+      mkdir build &
+      cd build &
+      cmake .. -DEIGEN3_INCLUDE_DIR="external/build/include/eigen3" -DCMAKE_BUILD_TYPE=Release -G "NMake Makefiles" &
+      nmake &
+      cd ..
+    )
 
   # Generate product
   - makensis sources\scripts\installer.nsi
@@ -57,11 +82,22 @@ build_script:
 #
 test_script:
   - ./setpath.bat
-  - scons --cfg=./configs/scons/config-windows-appveyor.py tests
-  #- scons --cfg=./configs/scons/config-windows-appveyor.py python tests
+  - if "%builder%" == "scons" (
+      scons --cfg=./configs/scons/config-windows-appveyor.py tests
+    ) else
+      cd build &
+      nmake test &
+      cd ..
+    )
 
 artifacts:
    - path: sources\scripts\ALTA.exe
      name: ALTA
    - path: config.log
      name: Log
+
+on_failure:
+    - ls
+    - if "%builder%" == "cmake" (
+        more Testing\Temporary\LastText.log
+      )

.travis.yml

 language: cpp
-matrix:
-   include:
-      - os: linux
-        dist: trusty
-        sudo: required
-        addons:
+env:
+    - builder=scons
+    - builder=cmake
+os:
+    - linux
+    - osx
+
+dist: trusty
+sudo: required
+addons:
     apt:
         sources:
             - ubuntu-toolchain-r-test
@@ -12,25 +16,34 @@ matrix:
             - g++-6
             - cmake
             - libboost-python-dev
-
-      - os: osx
-        before_install:
-           - brew update
-           - brew install scons
-
+            - libeigen3-dev
 
 before_install:
    - OMP_NUM_THREADS=2
    - eval "${MATRIX_EVAL}"
-     #- sudo apt-get update  -qq -y
-     #- sudo apt-get install -qq -y libopenexr-dev cmake libboost-python-dev libnlopt-dev coinor-libipopt-dev liblapack-dev libblas-dev libgfortran-4.8-dev
+   - echo "${builder}"
+   - if [ ${TRAVIS_OS_NAME} = 'osx' ]; then
+        brew update;
+        brew install scons eigen;
+     fi
 
 script:
    - git submodule init
    - git submodule update
-   - scons
-   - scons tests
-   #- scons tests python -i
+   - if [ ${builder} = 'scons' ]; then
+        scons;
+        scons tests;
+     else
+        mkdir build;
+        cd build;
+        cmake ..;
+        make -i;
+        make test;
+     fi
 
 after_failure:
-   - cat config.log
+   - if [ ${builder} = 'scons' ]; then
+        cat config.log;
+     else
+        cat Testing/Temporary/LastTest.log
+     fi

setpath.sh

@@ -27,3 +27,4 @@ export ALTA_PLUGIN_PATH="$builddir/plugins"
 export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$builddir/plugins:$external"
 export PATH="$PATH:$builddir/softs:$scripts"
 export PYTHONPATH="$PYTHONPATH:$builddir/python"
+export JUPYTER_PATH="$JUPYTER_PATH:$builddir/python"

sources/python/wrapper_data.h

@@ -51,6 +51,7 @@ inline void register_data(py::module& m) {
       .def("size",  &data::size)
       .def("get",   &data::get)
       .def("set",   &data::set)
+      .def("value", &data::value)
       .def("save",  &data::save)
       .def("parametrization", &data::parametrization);
    m.def("get_data",  get_data);

sources/python/wrapper_vec.h

@@ -63,7 +63,7 @@ inline void register_vec(py::module& m) {
         }))
 		.def("__add__", &vec_add)
 		.def("__sub__", &vec_sub)
-		.def("__len__", &vec::size)
+		// .def("__len__", &vec::size)
         .def("__getitem__", [](const vec &s, unsigned int i) {
             if (i >= s.size()) throw py::index_error();
             return s[i];