.travis.yml

# 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=2.4 GHCVER=8.6.3
 - CABALVER=2.4 GHCVER=8.8.1
 - CABALVER=3.2 GHCVER=8.10.1
 - CABALVER=head GHCVER=head   # see section about GHC HEAD snapshots

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


# 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
 - export PATH=/opt/ghc/$GHCVER/bin:/opt/cabal/$CABALVER/bin:$PATH

install:
 - cabal --version
 - echo "$(ghc --version) [$(ghc --print-project-git-commit-id 2> /dev/null || echo '?')]"
 - travis_retry cabal update
 # unnecessary and fails on older cabal-install:
 - if (( $(echo "$CABALVER < 3.2" |bc -l) )); then cabal install --only-dependencies --enable-tests --enable-benchmarks ; fi 

# 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
 # -v2 provides useful information for debugging
 - cabal configure --enable-tests --enable-benchmarks -v2

 # this builds all libraries and executables
 # (including tests/benchmarks)
 - cabal build

 - cabal test
 - cabal check || true # allowed to fail, due to -O0 in ghc-options

 # tests that a source-distribution can be generated
 - cabal sdist

 # check that the generated source-distribution can be built & installed
 # TODO I'm not sure how to ask cabal new-style to install an sdist tarball directly...
 - if (( $(echo "$CABALVER < 3.2" |bc -l) )); then DIST="dist" INSTALL_SUBCOMMAND="install"; else DIST="dist-newstyle/sdist" INSTALL_SUBCOMMAND="v1-install"; fi &&
   SRC_TGZ=$(cabal info . | awk '{print $2;exit}').tar.gz &&
   (cabal $INSTALL_SUBCOMMAND --force-reinstalls "$DIST/$SRC_TGZ")

# EOF