language: haskell
dist: trusty

cache:
  directories:
    - $HOME/.cabal/store

cabal: "3.0"

matrix:
  include:
    - ghc: "8.10.1"
    - ghc: "8.8.1"
    - ghc: "8.6.5"

install:
 - cabal --version
 - ghc --version

script:
 - cabal v2-update
 - cabal v2-build
 - cabal v2-test --enable-test
   # This weird bash stuff is a workaround for haskell/cabal#5977
 - "! cabal new-haddock 2>&1 >/dev/null | grep 'Failed to build documentation'"
 - cabal check
 - cabal sdist   # tests that a source-distribution can be generated

# Check that the resulting source distribution can be built & installed.
# If there are no other `.tar.gz` files in `dist`, this can be even simpler:
# `cabal install --force-reinstalls dist/*-*.tar.gz`
 - SRC_TGZ=$(cabal info . | awk '{print $2;exit}').tar.gz &&
   (cd dist-newstyle/sdist && cabal v1-install --force-reinstalls "$SRC_TGZ")


 - cabal v2-build polysemy-plugin
 - cabal v2-test --enable-test polysemy-plugin