image: "rust:latest"

variables:
  # move cargo data into the project directory so it can be cached
  CARGO_HOME: ${CI_PROJECT_DIR}/.cargo
  # treat compiler warnings as errors (in clippy, when running tests, etc.)
  RUSTFLAGS: -Dwarnings

default:
  # cancel the job if a newer pipeline starts for the same MR or branch
  interruptible: true
  cache:
    # use the git branch or tag as cache key, so the cache will be
    # shared among CI runs for the same branch or tag
    key: ${CI_COMMIT_REF_SLUG}
    # we cache .cargo/ and target/, which effectively enables
    # incremental builds across different executions of the CI
    # for the same branch or the same merge request
    paths:
      - .cargo
      - target

# a format check is run in parallel with the rest
cargo:fmt:
  script:
    - rustup component add rustfmt
    - cargo fmt --check