.travis.yml

# Use new container infrastructure to enable caching
sudo: false

# Do not choose a language; we provide our own build tools.
language: generic

matrix:
  include:
    - env: GHCVER=8.0.2 CABALVER=1.24
      compiler: ": #cabal 8.0.2"
      addons: {apt: {packages: [cabal-install-1.24,ghc-8.0.2], sources: [hvr-ghc]}}
    - env: GHCVER=8.2.2 CABALVER=1.24
      compiler: ": #cabal 8.2.2"
      addons: {apt: {packages: [cabal-install-1.24,ghc-8.2.2], sources: [hvr-ghc]}}
    - env: GHCVER=8.4.4 CABALVER=1.24
      compiler: ": #cabal 8.4.4"
      addons: {apt: {packages: [cabal-install-1.24,ghc-8.4.4], sources: [hvr-ghc]}}
    - env: GHCVER=8.6.5 CABALVER=1.24
      compiler: ": #cabal 8.6.5"
      addons: {apt: {packages: [cabal-install-1.24,ghc-8.6.5], sources: [hvr-ghc]}}
    - env: GHCVER=head CABALVER=head
      compiler: ": #cabal HEAD"
      addons: {apt: {packages: [cabal-install-head,ghc-head],  sources: [hvr-ghc]}}

  allow_failures:
   - env: GHCVER=head CABALVER=head

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
  - export PATH=/opt/ghc/$GHCVER/bin:/opt/cabal/$CABALVER/bin:$PATH
  # Uncomment whenever hackage is down.
  # - mkdir -p ~/.cabal && cp travis/config ~/.cabal/config && $CABAL update
  - cabal update

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

# Here starts the actual work to be performed for the package under test; any command which exits with a non-zero exit code causes the build to fail.
script:
 - if [ -f configure.ac ]; then autoreconf -i; fi
 - cabal configure --enable-tests --enable-benchmarks -v2 --ghc-options="-Werror" # -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")