deploy_bookdown.yml

on:
  push:
    branches: [main, master, v2]
  pull_request:
    branches: [main, master, v2]
  workflow_dispatch:

name: bookdown

jobs:
  bookdown:
    runs-on: ubuntu-latest
    concurrency:
      group: pkgdown-${{ github.event_name != 'pull_request' || github.run_id }}
    env:
      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
      EMAIL: ${{ secrets.EMAIL }}
    steps:
      # Checkout repository
      - uses: actions/checkout@v4

      # Setup Pandoc
      - uses: r-lib/actions/setup-pandoc@v2

      # Setup R environment with RSPM enabled
      - uses: r-lib/actions/setup-r@v2
        with:
          use-public-rspm: true

      # Restore cached package and TinyTeX state files
      - name: Cache package state
        uses: actions/cache@v4
        with:
          path: |
            installed_packages.rds
            tinytex_packages.rds
          key: package-state-${{ runner.os }}-${{ hashFiles('**/renv.lock') }}
          restore-keys: package-state-${{ runner.os }}-

      # Check and install R packages if needed
      - name: Check and Install R Packages
        run: |
          R -e '
            if (file.exists("installed_packages.rds")) {
              saved_pkgs <- readRDS("installed_packages.rds");
              current_pkgs <- installed.packages();
              if (!identical(saved_pkgs[,1], current_pkgs[,1])) {
                missing_pkgs <- setdiff(rownames(saved_pkgs), rownames(current_pkgs));
                if (length(missing_pkgs) > 0) install.packages(missing_pkgs);
              } else {
                cat("No package changes detected.\n");
              }
            } else {
              install.packages(c("tidyverse", "bookdown"));
            }'
        env:
          GITHUB_PAT: ${{ secrets.GITHUB_PAT }}

      # Install and cache TinyTeX only if needed
      - name: Install TinyTeX if Needed
        run: |
          if ! command -v tlmgr &> /dev/null; then
            R -e 'install.packages("tinytex"); tinytex::install_tinytex()';
            R -e 'tinytex::tlmgr_install(c("xetex", "fontspec", "xunicode", "geometry", "fancyhdr", "titlesec", "titling", "tocloft", "sectsty", "environ", "trimspaces", "wrapfig", "multirow", "colortbl", "tabularx", "varwidth", "footnote", "threeparttable", "enumitem", "footmisc", "fncychap", "hyphenat", "biblatex", "biber"))';
          else
            echo "TinyTeX is already installed";
          fi
        shell: bash

      # Cache TinyTeX installation
      - name: Cache TinyTeX installation
        uses: actions/cache@v4
        with:
          path: ~/.TinyTeX
          key: tinytex-${{ runner.os }}-${{ hashFiles('**/*.tex') }}
          restore-keys: tinytex-

      # Install fonts only if needed
      - name: Check and Install Fonts
        run: |
          if ! fc-list | grep -q "Inconsolata"; then
            sudo apt-get update;
            sudo apt-get install -y fonts-inconsolata fonts-nanum;
            sudo fc-cache -fv;
          else
            echo "Fonts are already installed";
          fi
        shell: bash

      # Setup renv if needed
      - uses: r-lib/actions/setup-renv@v2

      # Ensure _bookdown_files directory exists
      - name: Ensure _bookdown_files directory exists
        run: mkdir -p _bookdown_files

      # Cache bookdown results
      - name: Cache bookdown results
        uses: actions/cache@v4
        with:
          path: _bookdown_files
          key: bookdown-${{ hashFiles('**/*Rmd') }}
          restore-keys: bookdown-

      # Check if bookdown::pdf_book is enabled (not commented out) in _output.yml
      - name: Check for uncommented pdf_book in _output.yml
        id: check_pdf
        run: |
          if grep -qE '^[^#]*bookdown::pdf_book' _output.yml; then
            echo "PDF book is enabled.";
            echo "build_pdf=true" >> $GITHUB_ENV;
          else
            echo "PDF book is not enabled.";
            echo "build_pdf=false" >> $GITHUB_ENV;
          fi

      # Build PDF book if enabled
      - name: Build PDF book
        if: env.build_pdf == 'true'
        run: |
          R -e 'bookdown::render_book("index.Rmd", "bookdown::pdf_book")'

      # Build HTML books
      - name: Build HTML gitbook book
        if: (github.ref == 'refs/heads/main' || github.ref == 'refs/heads/master') || github.event_name == 'pull_request'
        run: |
          R -e 'bookdown::render_book("index.Rmd", "bookdown::gitbook")'

      - name: Build HTML bs4_book book
        if: github.ref == 'refs/heads/v2' || github.event_name == 'pull_request'
        run: |
          R -e 'bookdown::render_book("index.Rmd", "bookdown::bs4_book")'

      # Save R package state and TinyTeX installation to RDS files
      - name: Save R Package and TinyTeX State
        run: |
          R -e 'saveRDS(installed.packages(), file = "installed_packages.rds")';
          R -e 'tinytex_packages <- tinytex::tl_pkgs(); saveRDS(tinytex_packages, file = "tinytex_packages.rds")'

      # Deploy HTML to GitHub Pages if on main or master branch
      - name: Deploy to GitHub pages from main/master 🚀
        if: github.event_name != 'pull_request' && (github.ref == 'refs/heads/main' || github.ref == 'refs/heads/master')
        uses: JamesIves/github-pages-deploy-action@v4.6.4
        with:
          branch: gh-pages
          folder: docs
          clean: false

      # Deploy to v2-publish if on v2 branch
      - name: Deploy to v2-publish branch from v2 🚀
        if: github.event_name != 'pull_request' && github.ref == 'refs/heads/v2'
        uses: JamesIves/github-pages-deploy-action@v4.6.4
        with:
          branch: v2-publish
          folder: docs
          clean: false

      # Deploy to /v2 subdirectory of gh-pages from v2 branch
      - name: Deploy to v2 subdirectory of gh-pages 🚀
        if: github.event_name != 'pull_request' && github.ref == 'refs/heads/v2'
        uses: JamesIves/github-pages-deploy-action@v4.6.4
        with:
          branch: gh-pages
          folder: docs
          target-folder: v2 # Specify the target subdirectory
          clean: false