language: ruby

sudo: true

matrix:
  include:
    - os: osx
      osx_image: xcode10
      rvm: system
  fast_finish: true

branches:
  only:
    - master

cache:
  directories:
    - /usr/local/Homebrew/Library/Homebrew/vendor/bundle
    - /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby

install:
  - |
    # Force strict error checking.
    set -o errexit
    set -o pipefail
  - |
    # Update Travis commit range.
    # This is not normally required but does prevent problems with outdated forks and
    # deleted casks (see https://github.com/Homebrew/homebrew-cask/pull/43164).
    BRANCH_COMMIT="${TRAVIS_COMMIT_RANGE##*.}"
    TARGET_COMMIT="${TRAVIS_COMMIT_RANGE%%.*}"
    if ! MERGE_BASE="$(git merge-base "${BRANCH_COMMIT}" "${TARGET_COMMIT}" 2>/dev/null)"; then
      git fetch --unshallow
      MERGE_BASE="$(git merge-base "${BRANCH_COMMIT}" "${TARGET_COMMIT}")"
    fi
    export TRAVIS_COMMIT_RANGE="${MERGE_BASE}...${BRANCH_COMMIT}"
  - |
    # Switch to master branch.
    export HOMEBREW_COLOR=1
    export HOMEBREW_DEVELOPER=1
    export HOMEBREW_NO_AUTO_UPDATE=1
    brew update
  - |
    # Mirror the repo as a tap.
    TAP_DIR="$(brew --repository)/Library/Taps/${TRAVIS_REPO_SLUG}"
    mkdir -p "${TAP_DIR}"
    rsync -az --delete "${TRAVIS_BUILD_DIR}/" "${TAP_DIR}/"
    export TRAVIS_BUILD_DIR="${TAP_DIR}"
    builtin cd "${TRAVIS_BUILD_DIR}"

script: brew cask ci

notifications:
  email: false