language: nix

sudo: false

env:
  global:
    - CACHIX_CACHE=
    - NUR_REPO=<YOUR_NUR_REPO_NAME_HERE>

matrix:
  include:
    - env: NIX_CHANNEL=https://nixos.org/channels/nixpkgs-unstable
    - env: NIX_CHANNEL=https://nixos.org/channels/nixos-unstable
    - env: NIX_CHANNEL=https://nixos.org/channels/nixos-18.03
  # cachix will be introduced in 18.09, so we just allow a failure for now
  allow_failures:
    - env: NIX_CHANNEL=https://nixos.org/channels/nixos-18.03

install:
 - nix --version
 - if [ -n "${CACHIX_CACHE}" ]; then travis_retry nix-channel --update; fi
 - if [ -n "${CACHIX_CACHE}" ]; then nix-env -i cachix; fi
 - if [ -n "${CACHIX_CACHE}" ]; then cachix use "${CACHIX_CACHE}"; fi
 - nix-channel --add "${NIX_CHANNEL}" nixpkgs
 - travis_retry nix-channel --update

script:
 - outs=$(nix-build non-broken.nix) && echo Produced $outs
 - nix eval -f default.nix 'lib'
 - nix eval -f default.nix 'modules'
 - nix eval -f default.nix 'overlays'

after_success:
  - if [ -n "${CACHIX_CACHE}" ]; then cachix push "${CACHIX_CACHE}" $outs; fi
  - if [ "false" = "${TRAVIS_PULL_REQUEST}" -a "master" = "${TRAVIS_BRANCH}" ]; then
      curl -XPOST "https://nur-update.herokuapp.com/update?repo=${NUR_REPO}"; fi