.travis.yml

dist: xenial
sudo: required
cache: cargo
language: rust
addons:
  apt:
    packages:
      - kcov
      - libcurl4-openssl-dev
      - libelf-dev
      - libdw-dev
      - binutils-dev
      - cmake
    sources:
      - kalakris-cmake
      # The version of kcov shipped with Xenial (v25) doesn't support the
      # --verify option that `cargo coveralls` passes. This PPA has a more
      # up-to-date version. It can be removed if Ubuntu ever ships a newer
      # version, or replaced with another PPA if this one falls out of date.
      - sourceline: ppa:sivakov512/kcov

rust:
  - stable

before_script:
  # Travis installs rust with a non-default "minimal" profile, and advises us
  # to add clippy manually:
  - rustup component add clippy
  # Unfortunately, this method often breaks on the nightly channel, where the
  # most recent build might not have all the optional components.
  # We explicitly specify `--profile default` to obtain the most recent nightly
  # that has rustfmt (we don't care if it's a week old, as we need it only for
  # an experimental flag):
  - rustup toolchain install nightly --profile default

  - pip install 'travis-cargo<0.2' --user && export PATH=$HOME/.local/bin:$PATH
  - export PATH=$HOME/.cargo/bin:$PATH
  # `cargo install` fails if the specified binary is already installed, and
  # doesn't yet support a `--if-not-installed` option [0], so for now assume
  # failures mean the package is already installed. If installation truly
  # failed, the build will fail later anyway, when we try to use the installed
  # binary. Note that `cargo install --force` is not a solution, as it always
  # rebuilds from scratch, ignoring the cache entirely.
  #
  # [0]: https://github.com/rust-lang/cargo/issues/2082
  - cargo install cargo-update || echo "cargo-update already installed"  # for `cargo install-update`
  - cargo install cargo-travis || echo "cargo-travis already installed"  # for `cargo coveralls`
  - cargo install-update -a  # updates cargo-travis, if the cached version is outdated

script:
  # Clippy must be run first, as its lints are only triggered during
  # compilation. Put another way: after a successful `cargo build`, `cargo
  # clippy` is guaranteed to produce no results. This bug is known upstream:
  # https://github.com/rust-lang/rust-clippy/issues/2604.
  - travis-cargo clippy -- --all-targets --all-features -- -D warnings
  - travis-cargo build
  - travis-cargo test
  - travis-cargo test -- all-features
  # The license_template_path setting we use to verify copyright headers is
  # only available on the nightly rustfmt.
  - cargo +nightly fmt -- --check --config-path <(echo 'license_template_path = "HEADER"')

after_success:
  - cargo coveralls --verbose

env:
  global:
    - TRAVIS_CARGO_NIGHTLY_FEATURE=""