env:
 - GHCVER=7.0.4 CABALVER=1.16
 # we have to use CABALVER=1.16 for GHC<7.6 as well, as there's
 # no package for earlier cabal versions in the PPA
 - GHCVER=7.2.2 CABALVER=1.16
 - GHCVER=7.4.2 CABALVER=1.16
 - GHCVER=7.6.3 CABALVER=1.16
 - GHCVER=7.8.4 CABALVER=1.18
 - GHCVER=7.10.3 CABALVER=1.22
 - GHCVER=8.0.1 CABALVER=1.24
 - GHCVER=head  CABALVER=1.24

matrix:
  allow_failures:
   - env: GHCVER=head  CABALVER=1.24

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
 - cabal --version

install:
 - travis_retry cabal update
 # can't use "cabal install --only-dependencies --enable-tests" due to dep-cycle
 - cabal install "QuickCheck >=2.4" "byteorder ==1.0.*" "dlist >=0.5 && <0.8" "mtl >=2.0 && <2.3" deepseq test-framework-hunit test-framework-quickcheck2

script:
 - cabal configure --enable-tests -v2
 - cabal build
 # --show-details=streaming is available for CABALVER>=1.20 only
 - if [ "$(echo -e "1.20\n$CABALVER" | sort -rV | head -n1)" = "$CABALVER" ]; then
     cabal test --show-details=streaming;
   else
     cabal test --show-details=always;
   fi
 - cabal sdist
 # "cabal check" disabled due to -O2 warning
 - export SRC_TGZ=$(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

