name: Deploy

on:
  push:
    branches:
      - master
    paths:
      - book/**

jobs:
  deploy:
    name: Deploy
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2

      - name: Get mdBook
        working-directory: book
        run: |
          export MDBOOK_VERSION="v0.4.4"
          export MDBOOK_TARBALL="mdbook-${MDBOOK_VERSION}-x86_64-unknown-linux-gnu.tar.gz"
          export MDBOOK_URL="https://github.com/rust-lang/mdBook/releases/download/${MDBOOK_VERSION}/${MDBOOK_TARBALL}"
          curl -Lf "${MDBOOK_URL}" | tar -xz

      - name: Build
        working-directory: book
        run: ./mdbook build

      - name: Push to gh-pages
        working-directory: book/build
        run: |
          REV=$(git rev-parse --short HEAD)
          git init
          git remote add upstream https://x-access-token:${{secrets.GITHUB_TOKEN}}@github.com/dtolnay/cxx
          git config user.name "CXX"
          git config user.email "dtolnay+cxx@gmail.com"
          git add -A .
          git commit -qm "Website @ ${{github.repository}}@${REV}"
          git push -q upstream HEAD:refs/heads/gh-pages --force