.travis.yml

env:
   - CABALVER=1.24 GHCVER=8.0.2  # Debian 9
   - CABALVER=1.24 GHCVER=8.2.2
   - CABALVER=2.2 GHCVER=8.4.4  # Debian 10
   - CABALVER=2.4 GHCVER=8.6.5
   - CABALVER=3.0 GHCVER=8.8.3
   - CABALVER=3.2 GHCVER=8.10.1
   - CABALVER=head GHCVER=head

language: generic

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

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

install:
   - cabal --version
   - ghc --version
   - ghc --print-project-git-commit-id 2> /dev/null || true
   - travis_retry cabal update
   # For pre-3.0, need to install dependencies before configuring
   - cabal install --only-dependencies --enable-tests --enable-benchmarks || true

script:
   - cabal configure --enable-tests --enable-benchmarks -v2
   - |
     if [[ $CABALVER = [12]* ]]; then
        cabal build --ghc-options=-Werror
     else
        # https://github.com/haskell/cabal/issues/3883
        printf "package Glob\n  ghc-options: -Werror\n" >> cabal.project
        cabal build
     fi
   - cabal test
   - cabal haddock
   - cabal check
   - cabal sdist
   - |
      SRC_TGZ=$(cabal info . | awk '{print $2 ".tar.gz";exit}')
      cd dist-newstyle/sdist || cd dist
      if [[ -f "$SRC_TGZ" ]]; then
         if cabal --version | grep -q 'version 3.[0-3]'; then
            # https://github.com/haskell/cabal/issues/6393
            echo >&2 "cabal v2-install broke tarball installs, fixed in 3.4"
            echo >&2 "Will not test sdist installability"
         else
            cabal install --force-reinstalls "$SRC_TGZ"
         fi
      else
         echo >&2 "$SRC_TGZ not found"
         exit 1
      fi