language: cpp
os:
    - linux
    - osx
    - windows
dist:
    - bionic
osx_image:
    - xcode11.3
env:
    - OPENCV_BRANCH=master
    - OPENCV_BRANCH=3.4
cache:
    directories:
        - ${TRAVIS_BUILD_DIR}/opencv
before_script:
    - rmdir opencv || true
    - if [ ! -d opencv ]; then git clone --single-branch --branch ${OPENCV_BRANCH} https://github.com/opencv/opencv.git; fi
    - pushd opencv
    - mkdir -p build
    - cd build
    - cmake .. -DBUILD_LIST=core,imgproc,imgcodecs,calib3d,highgui -DBUILD_EXAMPLES=OFF -DCMAKE_INSTALL_PREFIX=../install
    - cmake --build . --parallel 8 --target install --config Release
    - popd
script:
    - mkdir -p build
    - cd build
    - export OPENCV_CONFIG=$(dirname $(find ${TRAVIS_BUILD_DIR}/opencv/install -name OpenCVConfig.cmake | head -n1))
    - cmake .. -DOpenCV_DIR=${OPENCV_CONFIG}
    - cmake --build . --config Release
    - export DEMO=$(find . -type f \( -name demo.exe -o -name demo \) | head -n1)
    - export PATH="$PATH:${TRAVIS_BUILD_DIR}/opencv/install/x86/vc15/bin"
    - echo | $DEMO