# from https://github.com/hvr/multi-ghc-travis

env:
 - CABALVER=1.22 GHCVER=7.8.4 # see note about Alex/Happy
 - CABALVER=1.22 GHCVER=7.10.3 # see note about Alex/Happy

before_install:
 - travis_retry sudo add-apt-repository -y ppa:hvr/ghc
 - travis_retry sudo apt-get update
 - travis_retry sudo apt-get install libgtk-3-dev cabal-install-$CABALVER ghc-$GHCVER libgsl0-dev liblapack-dev
 - export PATH=/opt/ghc/$GHCVER/bin:/opt/cabal/$CABALVER/bin:$PATH

install:
 - cabal update
 - cabal install alex
 - cabal install happy
 - cabal install gtk2hs-buildtools
 - for pkg in $(ghc-pkg list --user); do ghc-pkg unregister --force ${pkg}; done
 - cabal install Cabal
 - cabal install --only-dependencies --enable-tests --enable-benchmarks --reorder-goals

# 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:
 - 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 --show-details=always
# - 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 "$SRC_TGZ";
   else
      echo "expected '$SRC_TGZ' not found";
      exit 1;
   fi