main.yml

name: Preview
on:
  push:
    branches: main
  pull_request:
    branches: main
  
env:
  # Version of pandoc to be used for rendering blog posts
  AI_BLOG_PANDOC_VERSION: '2.14'
  # R packages that are required for rendering blog posts
  AI_BLOG_REQUIRED_PKGS: 'rmarkdown,distill,reticulate,dplyr,data.table,DT'
  GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: r-lib/actions/setup-r@v2 # https://github.com/r-lib/actions/issues/374
      - uses: r-lib/actions/setup-pandoc@v1
        with:
          pandoc-version: ${{ env.AI_BLOG_PANDOC_VERSION }}
      - name: Install Rsync
        run: |
          sudo DEBIAN_FRONTEND=noninteractive apt-get install -y rsync
      - name: Query Dependencies
        run: |
          print(R.version)
          install.packages('remotes')

          pkgs <- strsplit(Sys.getenv('AI_BLOG_REQUIRED_PKGS'), ',')[[1]]
          pkg_versions <- lapply(
            pkgs,
            function(x) {
              tryCatch(packageVersion(x), error = function(e) NULL )
            }
          )
          saveRDS(pkg_versions, '.github/pkg-versions.Rds', version = 2)
          saveRDS(remotes::package_deps(pkgs, dependencies = TRUE), '.github/pkg-deps.Rds', version = 2)

          writeLines(sprintf('R-%i.%i', getRversion()$major, getRversion()$minor), '.github/R-version')

          writeLines(Sys.getenv('AI_BLOG_PANDOC_VERSION'), '.github/pandoc-version')
        shell: Rscript {0}

      - name: Cache R Packages
        uses: actions/cache@v4
        with:
          path: ${{ env.R_LIBS_USER }}
          key: ${{ hashFiles('.github/R-version') }}-${{ hashFiles('.github/pkg-versions.Rds') }}-${{ hashFiles('.github/pkg-deps.Rds') }}
          restore-keys: ${{ hashFiles('.github/R-version') }}-

      - name: Upgrade Dependent Packages
        run: |
          pkgs <- strsplit(Sys.getenv('AI_BLOG_REQUIRED_PKGS'), ',')[[1]]
          remotes::install_cran(pkgs = pkgs, upgrade = TRUE)
          remotes::install_github('hadley/emo')
          # bug in downlit 0.4.1, rollback until the new version is on cran:
          # https://github.com/r-lib/downlit/commit/24ccb0b5d41a80583b1c998077fe528dd6c5af16
          if (packageVersion("downlit") == "0.4.1")
            remotes::install_version("downlit", "0.4.0")
        shell: Rscript {0}

      - name: Cache Build Artifacts
        uses: actions/cache@v4
        with:
          path: /tmp/_posts
          key: ${{ hashFiles('.github/pandoc-version') }}-${{ hashFiles('.github/R-version') }}-${{ hashFiles('.github/pkg-versions.Rds') }}-${{ hashFiles('.github/pkg-deps.Rds') }}

      - name: Render Posts
        run: |
          rm -rf docs/
          mv _posts/2019-12-20-differential-privacy/differential_privacy.Rmd _posts/2019-12-20-differential-privacy/differential_privacy_2019.Rmd
          set -x
          for file in $(find _posts -type f -name '*.Rmd')
          do
            (\
              diff -q {,/tmp/}"${file}" && \
                rsync -rv {/tmp/,}$(dirname "${file}")/ \
            ) || \
              R -e "rmarkdown::render('${file}')"
          done
          rm -rf /tmp/_posts
          cp -r _posts /tmp
        shell: bash
      - name: Render Site
        run: |
          R -e 'rmarkdown::render_site()'
      - name: Copy redirects
        run: |
          cp redirect/_redirects docs/
      - name: Deploy to GitHub
        uses: s0/git-publish-subdir-action@develop
        if: github.ref == 'refs/heads/main'
        env:
          REPO: self
          BRANCH: docs
          FOLDER: docs
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      - name: Deploy to Netlify
        uses: nwtgck/actions-netlify@v1.1
        with:
          publish-dir: './docs'
          production-branch: main
          github-token: ${{ secrets.GITHUB_TOKEN }}
          deploy-message: "Deploy from GitHub Actions"
          enable-pull-request-comment: false
          enable-commit-comment: true
          overwrites-pull-request-comment: true
        env:
          NETLIFY_AUTH_TOKEN: ${{ secrets.NETLIFY_AUTH_TOKEN }}
          NETLIFY_SITE_ID: ${{ secrets.NETLIFY_SITE_ID }}
        timeout-minutes: 3
      - name: Prepare Preview Directory
        if: github.ref != 'refs/heads/main'
        run: |
          rm -rf ai-blog-preview
          mkdir ai-blog-preview
          mv docs ai-blog-preview/ai-blog-preview
      - name: Upload Preview Directory as GitHub Artifact
        uses: actions/upload-artifact@v4
        if: github.ref != 'refs/heads/main'
        with:
          name: ai-blog-preview
          path: ai-blog-preview
  README:
    runs-on: ubuntu-latest
    needs: build
    steps:
      - name: Please download and unzip the GitHub artifact named 'ai-blog-preview' to obtain a browsable preview of the site.
        run: |
          echo "Please download and unzip the GitHub artifact named 'ai-blog-preview' to obtain a browsable preview of the site."