#########################
# project configuration #
#########################

# C++ project
language: cpp

dist: trusty
sudo: required
group: edge


################
# build matrix #
################

matrix:
  include:

  # Linux / GCC

  - os: linux
    compiler: gcc
    env:
      - COMPILER=g++-9
      - CXX_STANDARD=17
    addons:
      apt:
        sources: ['ubuntu-toolchain-r-test']
        packages: ['g++-9', 'ninja-build']

  # Linux / Clang

  - os: linux
    compiler: clang
    env:
      - COMPILER=clang++-7
      - CXX_STANDARD=17
    addons:
      apt:
        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-7']
        packages: ['g++-6', 'clang-7', 'ninja-build']

################
# build script #
################

script:
  # get CMake and Ninja (only for systems with brew - macOS)
  - |
     if [[ (-x $(which brew)) ]]; then
       brew update
       brew install cmake ninja
       brew upgrade cmake
       cmake --version
     fi

  # make sure CXX is correctly set
  - if [[ "${COMPILER}" != "" ]]; then export CXX=${COMPILER}; fi
  # by default, use the single-header version
  - if [[ "${MULTIPLE_HEADERS}" == "" ]]; then export MULTIPLE_HEADERS=OFF; fi
  # by default, use implicit conversions
  - if [[ "${IMPLICIT_CONVERSIONS}" == "" ]]; then export IMPLICIT_CONVERSIONS=ON; fi

  # append CXX_STANDARD to CMAKE_OPTIONS if required
  - CMAKE_OPTIONS+=${CXX_STANDARD:+ -DCMAKE_CXX_STANDARD=$CXX_STANDARD -DCMAKE_CXX_STANDARD_REQUIRED=ON}

  # force verbose build
  - CMAKE_OPTIONS+=" -DCMAKE_VERBOSE_MAKEFILE=ON"

  # compile and execute unit tests
  - mkdir -p build && cd build
  - cmake .. ${CMAKE_OPTIONS} -DJSON_MultipleHeaders=${MULTIPLE_HEADERS} -DJSON_ImplicitConversions=${IMPLICIT_CONVERSIONS} -DJSON_BuildTests=On -GNinja && cmake --build . --config Release --target test-conversions
  - ctest -C Release --timeout 2700 -V -R test-conversions -j
  - cd ..

  # check if homebrew works (only checks develop branch)   
  - if [ `which brew` ]; then   
    brew update ;   
    brew tap nlohmann/json ;    
    brew install nlohmann_json --HEAD ;    
    brew test nlohmann_json ;    
    fi