.travis.yml

#Travis CI configuration for KWStyle
# See http://travis-ci.org

#dist: xenial # This is the default as of April 2019
sudo: false
language: cpp

# global environment variables
# Note source code is checked out by travis to $TRAVIS_BUILD_DIR,
# located at ${HOME}/build/<USER>/<REPO>.
# $PROJ_BUILD_DIR must not be co-located with the source directory!
env:
  global:
    - PROJ_SOURCE_DIR=${TRAVIS_BUILD_DIR} # ${HOME}/build/<USER>/<REPO>
    - PROJ_BUILD_DIR=${HOME}/proj/build
    - PROJ_INSTALL_DIR=${HOME}/proj/install

# https://docs.travis-ci.com/user/customizing-the-build/
git:
  depth: 3

# cache the build dir
# note in the before_script step the cache will be deleted for certain
# TRAVIS_EVENT_TYPE (e.g., "pull_request") to ensure a full rebuild
# proior to some repository actions.
cache:
  timeout: 1000
  directories:
    - ${PROJ_BUILD_DIR}

# cache identifier
# travis hashes the "env" list of each build matrix element to
# discover an appropriate cache to restore
# https://docs.travis-ci.com/user/caching/#caches-and-build-matrices
#
# Increment CACHE_ID to force travis to ignore existing caches. This field is
# copied to the build matrix via yaml anchors.
cache_id: &cache_id
  CACHE_ID=0

# build matrix
# https://docs.travis-ci.com/user/languages/c/#gcc-on-linux
matrix:
  include:

    - os: linux
      compiler: gcc # default 5.4 as of Sept 2019
      addons:
        apt:
          packages:
            - ninja-build
            - cmake-data
            - cmake
      env:
        - MATRIX_NAME="gcc_default"
        - *cache_id

    - os: linux
      compiler: clang
      addons:
        apt:
          packages:
            - ninja-build
            - cmake-data
            - cmake
      env:
        - MATRIX_NAME="clang_default"
        - *cache_id

    # ppa:ubuntu-toolchain-r/test xenial gcc versions as of Sept 2019
    # https://launchpad.net/~ubuntu-toolchain-r/+archive/ubuntu/test
    # 4.9.4, 5.5.0, 6.5.0, 7.4.0

    - os: linux
      compiler: gcc
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
          packages:
            - ninja-build
            - cmake-data
            - cmake
            - g++-4.9
      env:
        - MATRIX_NAME="gcc-4.9"
        - MATRIX_EVAL="CC=gcc-4.9 && CXX=g++-4.9"
        - *cache_id

    # # gcc 5 is tested via default above
    # - os: linux
    #   compiler: gcc
    #   addons:
    #     apt:
    #       sources:
    #         - ubuntu-toolchain-r-test
    #       packages:
    #         - ninja-build
    #        - cmake-data
    #        - cmake
    #         - g++-5
    #   env:
    #     - MATRIX_NAME="gcc-5"
    #     - MATRIX_EVAL="CC=gcc-5 && CXX=g++-5"
    #     - *cache_id

    - os: linux
      compiler: gcc
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
          packages:
            - ninja-build
            - cmake-data
            - cmake
            - g++-6
      env:
        - MATRIX_NAME="gcc-6"
        - MATRIX_EVAL="CC=gcc-6 && CXX=g++-6"
        - *cache_id

    - os: linux
      compiler: gcc
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
          packages:
            - ninja-build
            - cmake-data
            - cmake
            - g++-7
      env:
        - MATRIX_NAME="gcc-7"
        - MATRIX_EVAL="CC=gcc-7 && CXX=g++-7"
        - *cache_id

# set compiler options
# https://docs.travis-ci.com/user/languages/c/#gcc-on-linux
before_install:
  - if [ ! -z "${MATRIX_EVAL}" ]; then eval "${MATRIX_EVAL}"; fi

# additional setup
install:

  # additional dependencies in ${HOME}/deps/
  - DEPS_DIR="${HOME}/deps"
  - mkdir -p ${DEPS_DIR} && cd ${DEPS_DIR}

  # install specific cmake version (minimum vxl requirement)
  # update to newer version of cmake later CMAKE_URL="https://cmake.org/files/v2.8/cmake-2.8.4-Linux-i386.tar.gz"
  - |
    if [[ "${TRAVIS_OS_NAME}" == "linux" ]]; then
      CMAKE_URL="http://www.cmake.org/files/v3.10/cmake-3.10.2-Linux-x86_64.tar.gz"
      mkdir cmake && travis_retry wget --no-check-certificate --quiet -O - ${CMAKE_URL} | tar --strip-components=1 -xz -C cmake
      export PATH=${DEPS_DIR}/cmake/bin:${PATH}
    fi

# script setup (e.g., cache deployment)
before_script:

  # delete build cache on pull_request or cron job
  - |
    if [ "${TRAVIS_EVENT_TYPE}" == "pull_request" ] || [ "${TRAVIS_EVENT_TYPE}" == "cron" ]; then
      rm -rf ${PROJ_BUILD_DIR}
    fi

  # create build & install directories if they do not exist
  - mkdir -p ${PROJ_BUILD_DIR} ${PROJ_INSTALL_DIR}

  # before script runs, we need to resolve timestamps between the git clone
  # and the older build cache. A good discussion is found here:
  # https://blog.esciencecenter.nl/travis-caching-and-incremental-builds-6518b89ee889
  - |
    MD5_FILE=${PROJ_BUILD_DIR}/build_cache.md5
    export OLDEST_DATE=$(find ${PROJ_BUILD_DIR} -type f -printf '%TD %TT\n' | sort | head -1)
    if [ -f ${MD5_FILE} ]; then
      (md5sum -c ${MD5_FILE} 2>/dev/null || :) | awk '{if ($NF == "OK") print substr($0, 1, length($0)-4)}' | xargs touch -d "${OLDEST_DATE}"
    fi
    find ${PROJ_SOURCE_DIR} \( -type d -name .git \) -prune -o -type f -print0 | xargs -0 md5sum > ${MD5_FILE}

  # display build directory
  - ls -la ${PROJ_BUILD_DIR}

# main script
script:
  - cmake --version
  - ${CC} --version
  - cd ${PROJ_BUILD_DIR}
  - cmake
          -G Ninja
          -DCMAKE_INSTALL_PREFIX:PATH=${PROJ_INSTALL_DIR}
          -DCMAKE_CXX_STANDARD:STRING=11
          -DCMAKE_BUILD_TYPE:STRING=Release
          ${PROJ_SOURCE_DIR}
  - ctest -D ExperimentalStart
  - ctest -D ExperimentalConfigure
  - ctest -D ExperimentalBuild -j2
  - ctest -D ExperimentalTest --schedule-random -j2 --output-on-failure
  - ctest -D ExperimentalSubmit
  - ninja install