language: c

# explicitly request container-based infrastructure
sudo: false

matrix:
  include:
    - env: CABALVER=1.18 GHCVER=7.8.4 HAPPYVER=1.19.4
      addons: {apt: {packages: [cabal-install-1.18,ghc-7.8.4,happy-1.19.4], sources: [hvr-ghc]}}
    - env: CABALVER=1.22 GHCVER=7.10.1 HAPPYVER=1.19.5
      addons: {apt: {packages: [cabal-install-1.22,ghc-7.10.1,happy-1.19.5],sources: [hvr-ghc]}}
    - env: CABALVER=head GHCVER=head HAPPYVER=head
      addons: {apt: {packages: [cabal-install-head,ghc-head,happy-head],  sources: [hvr-ghc]}}

  allow_failures:
   - env: CABALVER=1.18 GHCVER=7.8.4 HAPPYVER=1.19.4
   - env: CABALVER=head GHCVER=head HAPPYVER=head

before_install:
  - export PATH=/opt/ghc/$GHCVER/bin:/opt/cabal/$CABALVER/bin:$PATH:/opt/happy/$HAPPYVER/bin

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  # -v2 provides useful information for debugging
 - cabal build --ghc-options="-O0" # 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")