version: 2
jobs:
  build:
    docker:
      - image: cibuilds/hugo:0.57
    working_directory: ~/project
    environment:
      BRANCH: master
      TARGET_REPO: moontools-docs/moontools-docs.github.io.git
    steps:
      - checkout
      - run:
          name: "Run Hugo"
          command: HUGO_ENV=production hugo -v -s ~/project/src
      - deploy:
          command: |
            if [ "${CIRCLE_BRANCH}" = "master" ]; then
              echo -e "Starting to deploy to Github Pages\n"
              mkdir ~/repo
              cd ~/repo
              git config --global user.email "builds@circleci.com"
              git config --global user.name "CircleCI"
              #using token clone gh-pages branch
              git clone --quiet --branch=$CIRCLE_BRANCH https://${GH_TOKEN}@github.com/$TARGET_REPO built_website > /dev/null
              # Installing rsync
              echo "Installing rsync"
              apt-get -y install rsync
              #go into directory and copy data we're interested in to that directory
              cd built_website
              echo "rsync built code with checked out code..."
              rsync -r --exclude=.git --delete ~/project/src/build ~/repo
              #add, commit and push files
              echo "add files to git..."
              git add -f .
              echo "commit files to git repository..."
              if git commit -m "CircleCI build $CIRCLE_BUILD_NUM pushed to Github Pages" ; then
                echo "git push files with force..."
                git push -fq origin $BRANCH > /dev/null
                echo -e "Deploy completed\n"
              else
                echo "Content not changed, nothing to deploy"
              fi
            else
              echo "Not master branch, dry run only"
            fi