name: GitHub Pages

on:
  push:
    branches:
    - master

jobs:
  deploy:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@master
      with:
        fetch-depth: 1
        lfs: false

    # Pull from custom Hugo Extended image with opinionated changes:
    #    https://github.com/jakejarvis/hugo-custom/packages
    #    https://github.com/jakejarvis/hugo-custom/blob/master/Dockerfile
    # Can't use native `uses: docker://` syntax for GitHub Package Registry...
    - name: Build Hugo
      run: |
        echo ${{ secrets.GITHUB_ACCESS_TOKEN }} | docker login docker.pkg.github.com -u $GITHUB_ACTOR --password-stdin
        docker run -v $GITHUB_WORKSPACE:/src docker.pkg.github.com/jakejarvis/hugo-custom/hugo-custom:latest --gc --cleanDestinationDir --verbose
        docker logout docker.pkg.github.com

    # Copy built site to a directory where we have permissions, and
    # add a CNAME file for a custom domain (jarv.is).
    - name: Prepare for GitHub Pages
      run: |
        cp -r $GITHUB_WORKSPACE/public $HOME/gh-pages
        echo "jarv.is" > $HOME/gh-pages/CNAME

    # Put a bow on top of Hugo's automatic image processing by using
    # pngquant and jpegoptim to optimize/compress images in posts,
    # just a little lossily (is that a word?)
    # 
    # TODO: Find a way to cache the results, this takes about 4 minutes
    #       each build -- not ideal. Maybe use @sindresorhus/imagemin.
    - name: Optimize processed images
      run: |
        sudo DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends jpegoptim pngquant optipng
        cd $HOME/gh-pages/notes
        find . -iname "*.jp*" -print0 | xargs -0 jpegoptim --max=80 --strip-all
        find . -iname "*.png" -print0 | xargs -0 pngquant --quality=50-70 --speed 3 --ext=.png --force
        find . -iname "*.png" -print0 | xargs -0 optipng -o3 -force -strip all -quiet --
      # Ignore errors - override pipefail
      shell: bash {0}

    # Initialize a sub-repository in the new gh-pages directory and
    # add jakejarvis/jakejarvis.github.io as a remote.
    # Using native git commands for speed and simplicity, and because
    # this setup is a weird edge case not worth making an action for.
    - name: Deploy to jakejarvis.github.io
      run: |
        cd $HOME/gh-pages
        git init
        git config user.name "$GITHUB_ACTOR"
        git config user.email "$GITHUB_ACTOR@users.noreply.github.com"
        git remote add origin https://${{ secrets.GITHUB_ACCESS_TOKEN }}@github.com/jakejarvis/jakejarvis.github.io.git
        git add -A
        git commit -m "GitHub Pages deploy from $GITHUB_REPOSITORY@$GITHUB_SHA"
        git push --force origin master