version: 2
jobs:
  build:
    working_directory: ~/build
    docker:
      - image: circleci/node:latest
    branches:
      only:
        - master
    steps:
      - checkout
      - restore_cache:
          keys:
            - 'v1-{{ checksum "book.json" }}'
            - 'v1-'
      - run:
          name: "Install GitBook"
          command: npm install gitbook-cli && ./node_modules/.bin/gitbook install
      - run:
          name: "Clone gh-pages"
          command: git clone --branch gh-pages git@github.com:metosin/reitit.git ~/gh-pages
      - run:
          name: Build the documentation
          command: |
            ./node_modules/.bin/gitbook build
            cp -r _book/* ~/gh-pages/
      - add_ssh_keys:
          fingerprints:
            - "2d:eb:be:af:53:33:36:01:40:61:81:9d:76:84:8e:83"
      - deploy:
          name: Upload the documentation
          command: |
            cd ~/gh-pages
            git config user.name  "Automatic build"
            git config user.email "noreply@metosin.fi"
            git add -A
            git commit -m "Build book from commit $CIRCLE_SHA1 [skip ci]"
            git push
      - save_cache:
          key: 'v1-{{ checksum "book.json" }}'
          paths:
            - node_modules