# NB: don't set `language: haskell` here

# The following enables several GHC versions to be tested; often it's enough to test only against the last release in a major GHC version. Feel free to omit lines listings versions you don't need/want testing for.
env:
# - CABALVER=1.16 GHCVER=6.12.3
# - CABALVER=1.16 GHCVER=7.0.1
# - CABALVER=1.16 GHCVER=7.0.2
# - CABALVER=1.16 GHCVER=7.0.3
# - CABALVER=1.16 GHCVER=7.0.4
# - CABALVER=1.16 GHCVER=7.2.1
# - CABALVER=1.16 GHCVER=7.2.2
# - CABALVER=1.16 GHCVER=7.4.1
 - CABALVER=1.16 GHCVER=7.4.2
# - CABALVER=1.16 GHCVER=7.6.1
# - CABALVER=1.16 GHCVER=7.6.2
 - CABALVER=1.18 GHCVER=7.6.3
# - CABALVER=1.18 GHCVER=7.8.1  # see note about Alex/Happy for GHC >= 7.8
# - CABALVER=1.18 GHCVER=7.8.2
 - CABALVER=1.18 GHCVER=7.8.3
 - CABALVER=1.22 GHCVER=7.10.1
# - CABALVER=head GHCVER=head   # see section about GHC HEAD snapshots

matrix:
  allow_failures:
   - env: CABALVER=1.22 GHCVER=7.10.1

# Note: the distinction between `before_install` and `install` is not important.
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
 - |
   if [ $GHCVER = "head" ] || [ ${GHCVER%.*} = "7.8" ] || [ ${GHCVER%.*} = "7.10" ]; then
     travis_retry sudo apt-get install happy-1.19.4 alex-3.1.3
     export PATH=/opt/alex/3.1.3/bin:/opt/happy/1.19.4/bin:$PATH
   else
     travis_retry sudo apt-get install happy alex
   fi

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   # this builds all libraries and executables (including tests/benchmarks)
 - cabal test
 - cabal check
 - cabal sdist   # tests that a source-distribution can be generated

# The following scriptlet checks that the resulting source distribution can be built & installed
 - export SRC_TGZ=$(cabal info . | awk '{print $2 ".tar.gz";exit}') ;
   cd dist/;
   if [ -f "$SRC_TGZ" ]; then
      cabal install --force-reinstalls "$SRC_TGZ";
   else
      echo "expected '$SRC_TGZ' not found";
      exit 1;
   fi