.travis.yml

sudo: false
language: c

cache:
  directories:
    - .cabal-sandbox

matrix:
  include:
    - env: CABALVER=1.24 GHCVER=8.0.2
      addons: {apt: {sources: [hvr-ghc], packages: [cabal-install-1.24,ghc-8.0.2,happy-1.19.5,alex-3.1.7]}}
    - env: CABALVER=2.2 GHCVER=8.4.4
      addons: {apt: {sources: [hvr-ghc], packages: [cabal-install-2.2,ghc-8.4.4,happy-1.19.5,alex-3.1.7]}}

  allow_failures:
    - env: CABALVER=head GHCVER=head

before_install:
  - export PATH=/opt/ghc/$GHCVER/bin:/opt/cabal/$CABALVER/bin:$PATH
  - export PATH=/opt/alex/3.1.7/bin:/opt/happy/1.19.5/bin:$PATH

install:
 - cabal --version
 - echo "$(ghc --version) [$(ghc --print-project-git-commit-id 2> /dev/null || echo '?')]"
 - travis_retry cabal update
 - cabal sandbox init
 - 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 -j  # this builds all libraries and executables (including tests/benchmarks)
 - cabal test -j
 - 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 $2;exit}').tar.gz &&
   (cd dist && cabal sandbox init --sandbox=../.cabal-sandbox && cabal install -j --force-reinstalls "$SRC_TGZ")