.travis.yml

notifications:
  email:
    on_success: change
    on_failure: change

sudo: required

env:
 - CABALVER=1.24 GHCVER=8.0.2
 - CABALVER=1.24 GHCVER=8.2.2
 - CABALVER=1.24 GHCVER=8.4.3
 - CABALVER=2.2 GHCVER=8.8.3

before_install:
 - travis_retry sudo add-apt-repository -y ppa:hvr/ghc
 - travis_retry sudo apt-get update
 - travis_retry sudo apt-get install cabal-install-$CABALVER ghc-$GHCVER # see note about happy/alex
 - export PATH=/opt/ghc/$GHCVER/bin:/opt/cabal/$CABALVER/bin:$PATH

install:
 - cabal --version
 - echo "$(ghc --version) [$(ghc --print-project-git-commit-id 2> /dev/null || echo '?')]"
 - travis_retry cabal update
 - cabal install --only-dependencies --enable-tests --enable-benchmarks

before_script:
 - sudo sh -c 'echo 0 > /proc/sys/net/ipv6/conf/all/disable_ipv6'
 - sudo sh -c 'echo "::1 localhost" >> /etc/hosts'
 - sudo sh -c 'cat /etc/hosts'

script:
 - cabal configure --enable-tests --enable-benchmarks -v2  # -v2 provides useful information for debugging
 - cabal build   # this builds all libraries and executables (including tests/benchmarks)
 - cabal test
 - cabal check
 - cabal sdist   # tests that a source-distribution can be generated

# Check that the resulting source distribution can be built & installed.
# If there are no other `.tar.gz` files in `dist`, this can be even simpler:
# `cabal install --force-reinstalls dist/*-*.tar.gz`
 - SRC_TGZ=$(cabal info . | awk '{print $2;exit}').tar.gz &&
   (cd dist && cabal install --force-reinstalls "$SRC_TGZ")