.gitlab-ci.yml

# Stages: the build stage is where the code is build, and the publish stage is
# where it is deployed to diff.rs.
stages:
  - check
  - build
  - publish

# Run unit tests
test:
  stage: check
  image: rust
  script:
    - cargo test

# Check style by running clippy and rustfmt.
style:
  stage: check
  image: rust
  script:
    - rustup component add clippy
    - rustup toolchain add nightly
    - rustup component add rustfmt --toolchain nightly
    - cargo clippy -- --deny warnings
    - cargo +nightly fmt --check

# Build stage: builds everything using trunk.
#
# Uses the "rust" docker image as base, just needs to add the wasm32 target and
# download trunk. It downloads a pre-built version of trunk because that is
# faster.
#
# Then performs a trunk release build. Trunk will put everything into the dist/
# folder, so this is set up to export anything from that folder as artifact so
# that the next CI stage has access to it.
build:
  stage: build
  image: rust
  variables:
    TRUNK_VERSION: 0.20.3
  before_script:
    - rustup target add wasm32-unknown-unknown
    - wget -qO- https://github.com/thedodd/trunk/releases/download/v${TRUNK_VERSION}/trunk-x86_64-unknown-linux-gnu.tar.gz | tar -xzf- -C /usr/local/bin
  script:
    - trunk build --release
  artifacts:
    paths:
      - dist

# Pages job: compress files and publish statically. this takes the output from
# the "build" job and produces a folder containing everything that needs to be
# statically hosted.
#
# It compresses everything in the dist/ folder with brotli and gzip, because
# GitLab pages has a feature where it will serve pre-compressed content if you
# compress it like this. that means the page loads faster.
#
# we also have to do is add a redirects file: because this is a single-page
# app, we want every path to resolve to the index.html (otherwise you get a 404
# if you request diff.rs/serde, because there is no actual file or folder named
# "serde").
pages:
  stage: publish
  image: alpine
  before_script:
    - apk add brotli gzip
  script:
    - mv dist public
    - find public -not -name '*.gz' -not -name '*.br' -type f -exec gzip -vk {} \;
    - find public -not -name '*.gz' -not -name '*.br' -type f -exec brotli -vk {} \;
    - echo '/* / 200' >> public/_redirects
  artifacts:
    paths:
      - public
  only:
    - master