.travis.yml

# Travis CI configuration file.
# @link https://travis-ci.org/

# Declare project language and PHP versions to test against.
# @link http://about.travis-ci.org/docs/user/languages/php/
language: php
php:
  - 7.2

before_script:
  # Print system info for debugging.
  - node --version
  - npm --version
  - timedatectl

jobs:
  include:
    # To keep things clean, we set up separate jobs for Travis per project.
    - name: "Blocks"
      install:
        - nvm install && nvm use
        - npm install npm -g
        # `npm ci` runs a "clean install"
        - npm --prefix=$TRAVIS_BUILD_DIR/public_html/wp-content/mu-plugins/blocks ci
      script:
        - cd public_html/wp-content/mu-plugins/blocks
        # Run eslint & stylelint over all JS/SCSS files
        # @todo Find a way to only run on changed files
        - npm run lint:js -- --config=./.eslintrc.js
        - npm run lint:css
        # Make sure the build completes.
        - npm run build

    - name: "PHP Code Standards"
      # Only run if we're on the "pull request build", otherwise CHANGED_FILES is empty.
      if: branch = production
      install:
        - composer install
      script:
        # Create an empty PHP file, which will be passed to the linter along with all the changed files.
        # Otherwise, the linter will get no args, and attempt to lint the entire repo.
        - touch $TRAVIS_BUILD_DIR/tmp.php
        # Exporting list of changed files in CHANGED_FILES variable
        # diff: Get the changed files
        #   --name-only: Get only name of changed files
        #   --diff-filter=AM: Get only (A)dded or (M)odified files. We do not care about deleted files for coding standard test.
        #   $TRAVIS_BRANCH: Base branch we want to merge. Usually this will be master
        #   $TRAVIS_BRANCH...HEAD: List of commits not present in $TRAVIS_BRANCH, but present in HEAD
        # tr '\n' ' ': Convert from list of filenames seperated by `\n` to list of filenames seperated by ' '
        - export CHANGED_FILES=$(git diff --name-only --diff-filter=AM $TRAVIS_BRANCH...HEAD | tr '\n' ' ')
        # Run phpcs installed via composer, only run over changed files.
        # tmp.php: So that phpcs do not assume that it has to scan all files in case no php files are changed.
        - composer run-script phpcs $TRAVIS_BUILD_DIR/tmp.php $(echo $CHANGED_FILES) -- -n