language: cpp
notifications:
  email: false

# Use Linux unless specified otherwise
os: linux
dist: bionic

cache:
  directories:
    - ${TRAVIS_BUILD_DIR}/deps

stages:
  - name: Latest     # Compiler with the latest major version
  - name: Previous   # Compilers with the major version Latest - 1
  - name: Validation # run other jobs

jobs:
  include:

    ##########################################################################
    # Validate CMake configuration
    ##########################################################################

    - name: CMake 3.1.3 - latest
      stage: Validation
      env: &CMAKE_VERSION_LIST
      - CMAKE_VERSION: '"3.17.0 3.16.5 3.15.7 3.14.7 3.13.5 3.12.4 3.11.4 3.10.3 3.9.6 3.8.2 3.7.2 3.6.3 3.5.2 3.4.3 3.3.2 3.2.3 3.1.3"'
      - GSL_CXX_STANDARD: 14
      addons: # Get latest release (candidate)
        apt:
          sources:
          - sourceline: 'deb https://apt.kitware.com/ubuntu/ bionic main'
            key_url: 'https://apt.kitware.com/keys/kitware-archive-latest.asc'
          - sourceline: 'deb https://apt.kitware.com/ubuntu/ bionic-rc main'
          packages:
          - cmake
      script:
      - |
        cd ./build
        ( set -eu
          for CMAKE in ${CMAKE_path[@]}; do test_CMake_generate $CMAKE; done
          export CXX=clang++
          for CMAKE in ${CMAKE_path[@]}; do test_CMake_generate $CMAKE; done
        )

    - name: CMake 3.2.3 - 3.17.0
      stage: Validation
      os: osx
      osx_image: xcode11.3
      env:
      - CMAKE_VERSION: '"3.17.0 3.16.5 3.15.7 3.14.7 3.13.5 3.12.4 3.11.4 3.10.3 3.9.6 3.8.2 3.7.2 3.6.3 3.5.2 3.4.3 3.3.2 3.2.3"'
      script:
      - |
        cd ./build
        ( set -eu
          for CMAKE in ${CMAKE_path[@]}; do test_CMake_generate $CMAKE; done
        )

    ##########################################################################
    # AppleClang on OSX
    ##########################################################################



    # Xcode 10.3
    - name: AppleClang Xcode-10.3 C++14 Debug
      stage: Previous
      env: BUILD_TYPE=Debug GSL_CXX_STANDARD=14
      os: osx
      osx_image: xcode10.3 # AppleClang 10.0.1 same compiler as Xcode 10.2
    - name: AppleClang Xcode-10.3 C++14 Release
      env: BUILD_TYPE=Release GSL_CXX_STANDARD=14
      os: osx
      osx_image: xcode10.3
    - name: AppleClang Xcode-10.3 C++17 Debug
      env: BUILD_TYPE=Debug GSL_CXX_STANDARD=17
      os: osx
      osx_image: xcode10.3
    - name: AppleClang Xcode-10.3 C++17 Release
      env: BUILD_TYPE=Release GSL_CXX_STANDARD=17
      os: osx
      osx_image: xcode10.3


    # Xcode 11.4
    - name: AppleClang Xcode-11.4 C++17 Debug
      stage: Latest
      env: BUILD_TYPE=Debug GSL_CXX_STANDARD=17
      os: osx
      osx_image: xcode11.4
    - name: AppleClang Xcode-11.4 C++17 Release
      env: BUILD_TYPE=Release GSL_CXX_STANDARD=17
      os: osx
      osx_image: xcode11.4
    - name: AppleClang Xcode-11.4 C++14 Debug
      env: BUILD_TYPE=Debug GSL_CXX_STANDARD=14
      os: osx
      osx_image: xcode11.4
    - name: AppleClang Xcode-11.4 C++14 Release
      env: BUILD_TYPE=Release GSL_CXX_STANDARD=14
      os: osx
      osx_image: xcode11.4

    ##########################################################################
    # Clang on Linux
    ##########################################################################

    # Clang 9
    - name: Clang-9 C++14 Debug
      stage: Previous
      env: CXX=clang++-9 BUILD_TYPE=Debug GSL_CXX_STANDARD=14
      addons: &clang9
        apt:
          sources:
          - sourceline: 'deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic-9 main'
            key_url: https://apt.llvm.org/llvm-snapshot.gpg.key
          packages:
          - clang-9
    - name: Clang-9 C++14 Release
      env: CXX=clang++-9 BUILD_TYPE=Release GSL_CXX_STANDARD=14
      addons: *clang9
    - name: Clang-9 C++17 Debug
      env: CXX=clang++-9 BUILD_TYPE=Debug GSL_CXX_STANDARD=17
      addons: *clang9
    - name: Clang-9 C++17 Release
      env: CXX=clang++-9 BUILD_TYPE=Release GSL_CXX_STANDARD=17
      addons: *clang9

    # Clang 10
    - name: Clang-10 C++14 Debug
      stage: Latest
      env: CXX=clang++-10 BUILD_TYPE=Debug GSL_CXX_STANDARD=14
      addons: &clang10
        apt:
          sources:
          - sourceline: 'deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic-10 main'
            key_url: https://apt.llvm.org/llvm-snapshot.gpg.key
          packages:
          - clang-10
    - name: Clang-10 C++14 Release
      env: CXX=clang++-10 BUILD_TYPE=Release GSL_CXX_STANDARD=14
      addons: *clang10
    - name: Clang-10 C++17 Debug
      env: CXX=clang++-10 BUILD_TYPE=Debug GSL_CXX_STANDARD=17
      addons: *clang10
    - name: Clang-10 C++17 Release
      env: CXX=clang++-10 BUILD_TYPE=Release GSL_CXX_STANDARD=17
      addons: *clang10

    ##########################################################################
    # GCC on Linux
    ##########################################################################

    # GCC 8
    - name: GCC-8 C++14 Debug
      stage: Previous
      env: CXX=g++-8 BUILD_TYPE=Debug GSL_CXX_STANDARD=14
      addons: &gcc8
        apt:
          packages: g++-8
    - name: GCC-8 C++14 Release
      env: CXX=g++-8 BUILD_TYPE=Release GSL_CXX_STANDARD=14
      addons: *gcc8
    - name: GCC-8 C++17 Debug
      env: CXX=g++-8 BUILD_TYPE=Debug GSL_CXX_STANDARD=17
      addons: *gcc8
    - name: GCC-8 C++17 Release
      env: CXX=g++-8 BUILD_TYPE=Release GSL_CXX_STANDARD=17
      addons: *gcc8

    # GCC 9
    - name: GCC-9 C++14 Debug
      stage: Latest
      env: CXX=g++-9 BUILD_TYPE=Debug GSL_CXX_STANDARD=14
      addons: &gcc9
        apt:
          sources:
          - sourceline: ppa:ubuntu-toolchain-r/test
          packages:
          - g++-9
    - name: GCC-9 C++14 Release
      env: CXX=g++-9 BUILD_TYPE=Release GSL_CXX_STANDARD=14
      addons: *gcc9
    - name: GCC-9 C++17 Debug
      env: CXX=g++-9 BUILD_TYPE=Debug GSL_CXX_STANDARD=17
      addons: *gcc9
    - name: GCC-9 C++17 Release
      env: CXX=g++-9 BUILD_TYPE=Release GSL_CXX_STANDARD=17
      addons: *gcc9

before_install:
  - |
    # Configuration
    JOBS=2 # Travis machines have 2 cores
    # Dependencies required by the CI (cached directory)
    DEPS_DIR="${TRAVIS_BUILD_DIR}/deps"
  - |
    # Setup
    mkdir -p "${DEPS_DIR:?}" && cd "${DEPS_DIR:?}"
    mkdir -p ~/tools && cd ~/tools
    if [[ ${TRAVIS_OS_NAME:?} == "osx" ]]; then
      export PATH="/usr/local/opt/coreutils/libexec/gnubin:$PATH"
    fi
  - |
    # Helper functions
    # usage: if [[ $(check_url '<url>') ]]; then ...
    function check_url {( set +e
      if [[ "$1" =~ 'github.com' ]]; then # check for first byte
        if curl --fail --silent --output /dev/null --connect-timeout 12 --range 0-0 "$1"
        then echo true; fi
      else # request head
        if curl --fail --silent --output /dev/null --connect-timeout 12 --head "$1"
        then echo true; fi
      fi
      return
    )}

install:
  ############################################################################
  # Install a different CMake version (or several)
  ############################################################################
  - |
    # Install CMake versions
    ( set -euo pipefail
      if [[ ${CMAKE_VERSION:-} ]]; then
        if [[ "${TRAVIS_OS_NAME}" == "linux" ]]; then
          OS="Linux"; EXT="sh"
          if [[ ! ("${CMAKE_VERSION:-}" =~ .+[' '].+) ]]; then
            # Single entry -> default CMake version
            CMAKE_DEFAULT_DIR="/usr/local"
          fi
        elif [[ "${TRAVIS_OS_NAME}" == "osx" ]]; then OS="Darwin"; EXT="tar.gz"
        else echo "CMake install not supported for this OS."; exit 1
        fi
        CMAKE_INSTALLER="install-cmake.${EXT}"
      fi
      for VERSION in ${CMAKE_VERSION:-}; do
        CMAKE_URL="https://github.com/Kitware/CMake/releases/download/v${VERSION}/cmake-${VERSION}-${OS}-x86_64.${EXT}"
        if [[ $(check_url "$CMAKE_URL") ]]; then
          curl -sSL ${CMAKE_URL} -o ${CMAKE_INSTALLER}
          CMAKE_DIR="${CMAKE_DEFAULT_DIR:-"${HOME}/tools/cmake-${VERSION}"}"
          mkdir -p ${CMAKE_DIR}
          if [[ "${TRAVIS_OS_NAME}" == "linux" ]]; then
            chmod +x ${CMAKE_INSTALLER}
            sudo ./${CMAKE_INSTALLER} --prefix=${CMAKE_DIR} --skip-license
          else # OSX
            mkdir -p ./CMake_tmp
            tar --extract --gzip --file=${CMAKE_INSTALLER} --directory=./CMake_tmp
            mv ./CMake_tmp/*/CMake.app/Contents/* ${CMAKE_DIR}
          fi
          rm --recursive --force ./CMake_tmp ${CMAKE_INSTALLER}
        else echo 'Invalid url!'; echo "Version: ${VERSION}"
        fi
      done
    )
    if [[ ${CMAKE_VERSION:-} && "${TRAVIS_OS_NAME:?}" == "osx" && ! ("${CMAKE_VERSION:-}" =~ .+[' '].+) ]]
    then # Single entry -> default CMake version
      export PATH=${HOME}/tools/cmake-${CMAKE_VERSION:?}/bin:$PATH
    fi
    CMAKE_path=("cmake") # start with installed CMake version
    for VERSION in ${CMAKE_VERSION:-}; do
      tmp_path="$HOME/tools/cmake-${VERSION:?}/bin/cmake"
      if [[ -x "$(command -v ${tmp_path:?})" ]]; then CMAKE_path+=("${tmp_path:?}"); fi
    done
    function test_CMake_generate {
      # $1: cmake or full path to cmake
      shopt -s extglob
      if [[ "$1" == "cmake" || -x "$(command -v $1)" && "$1" =~ .*cmake$ ]]; then
        echo "----------------"
        $1 --version
        echo "Configuration = ${BUILD_TYPE:-Debug}"
        $1 -DCMAKE_BUILD_TYPE=${BUILD_TYPE:-Debug} ${CMAKE_GEN_FLAGS[@]:?} ..
        rm -rf !(tests/googletest-*)
        if [[ ! ${BUILD_TYPE:-} ]]; then echo "" && echo "Configuration = Release"
          $1 -DCMAKE_BUILD_TYPE=Release ${CMAKE_GEN_FLAGS[@]:?} ..
          rm -rf !(tests/googletest-*)
        fi
      else echo "Non existing command: $1"
      fi
    }
  - |
    # CMake wrapper (Trusty, Xenial & Bionic); restore default behaviour.
    if [[ "${TRAVIS_OS_NAME:?}" == "linux" &&
          "$(lsb_release --codename)" =~ (trusty|xenial|bionic)$ ]]
    then
      if [[ -x $(command -v /usr/local/bin/cmake) ]]; then
        function cmake { command /usr/local/bin/cmake $@; }
      elif [[ -x $(command -v /usr/bin/cmake) ]]; then
        function cmake { command /usr/bin/cmake $@; }
      fi
    fi

  ############################################################################
  # [linux]: Install the right version of libc++
  # Based on https://github.com/ldionne/hana/blob/master/.travis.yml
  ############################################################################
  - |
    LLVM_INSTALL=${DEPS_DIR:?}/llvm/install
    # if in linux and compiler clang and llvm not installed
    if [[ "${TRAVIS_OS_NAME:?}" == "linux" && "${CXX%%+*}" == "clang" && -n "$(ls -A ${LLVM_INSTALL:?})" ]]; then
      if   [[ "${CXX}" == "clang++-3.6" ]]; then LLVM_VERSION="3.6.2";
      elif [[ "${CXX}" == "clang++-3.7" ]]; then LLVM_VERSION="3.7.1";
      elif [[ "${CXX}" == "clang++-3.8" ]]; then LLVM_VERSION="3.8.1";
      elif [[ "${CXX}" == "clang++-3.9" ]]; then LLVM_VERSION="3.9.1";
      fi
      LLVM_URL="http://llvm.org/releases/${LLVM_VERSION}/llvm-${LLVM_VERSION}.src.tar.xz"
      LIBCXX_URL="http://llvm.org/releases/${LLVM_VERSION}/libcxx-${LLVM_VERSION}.src.tar.xz"
      LIBCXXABI_URL="http://llvm.org/releases/${LLVM_VERSION}/libcxxabi-${LLVM_VERSION}.src.tar.xz"
      mkdir -p llvm llvm/build llvm/projects/libcxx llvm/projects/libcxxabi
      travis_retry wget -O - ${LLVM_URL} | tar --strip-components=1 -xJ -C llvm
      travis_retry wget -O - ${LIBCXX_URL} | tar --strip-components=1 -xJ -C llvm/projects/libcxx
      travis_retry wget -O - ${LIBCXXABI_URL} | tar --strip-components=1 -xJ -C llvm/projects/libcxxabi
      (cd llvm/build && cmake .. -DCMAKE_INSTALL_PREFIX=${LLVM_INSTALL})
      (cd llvm/build/projects/libcxx && make install -j2)
      (cd llvm/build/projects/libcxxabi && make install -j2)
      export CXXFLAGS="-isystem ${LLVM_INSTALL}/include/c++/v1"
      export LDFLAGS="-L ${LLVM_INSTALL}/lib -l c++ -l c++abi"
      export LD_LIBRARY_PATH="${LD_LIBRARY_PATH}:${LLVM_INSTALL}/lib"
    fi

before_script:
  - |
    cd "${TRAVIS_BUILD_DIR:?}"
    mkdir build && cd build
    if [[ ${GSL_CXX_STANDARD:-} ]]; then
      CMAKE_GEN_FLAGS=("-DGSL_CXX_STANDARD=$GSL_CXX_STANDARD")
    fi
    CMAKE_GEN_FLAGS+=("-Wdev -Werror=dev --warn-uninitialized")

script:
  # generate build files
  - cmake .. -DCMAKE_BUILD_TYPE=${BUILD_TYPE:?} ${CMAKE_GEN_FLAGS[@]:?}
  # build and run tests
  - cmake --build . -- -j${JOBS}
  - ctest --output-on-failure -j${JOBS}