generate-theme-gallery.yml

name: Update Theme Gallery

concurrency: 
  group: theme-gallery
  cancel-in-progress: false

on:
  workflow_dispatch:
  workflow_run:
    workflows: ["Package Theme Previews"]
    types:
      - completed
    branches:
      - main

jobs:
  update-readme:
    runs-on: ubuntu-latest
    permissions:
      contents: write

    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0  # Fetch all history for all branches and tags
      
      - name: Check for new themes
        id: check-themes
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          normalize_name() {
            echo "$1" | sed "s/ /_/g; s/'//g; s/!//g"
          }

          # Get normalized list of theme directories
          current_themes=$(find Themes -maxdepth 1 -mindepth 1 -type d | sed 's|Themes/||' | while IFS= read -r name; do normalize_name "$name"; done | sort)
          echo "::debug::Current themes (normalized):"
          echo "::debug::$current_themes"

          # Get list of themes from release assets
          release_themes=$(gh release view 1 --json assets -q '.assets[].name' 2>/dev/null | sed 's|\.7z$||' | sort)
          echo "::debug::Themes in release:"
          echo "::debug::$release_themes"

          echo "$current_themes" > current_themes.txt
          echo "$release_themes" > release_themes.txt

          if ! diff current_themes.txt release_themes.txt > theme_diff.txt; then
            echo "::notice::Differences detected between directory and release:"
            cat theme_diff.txt
            echo "theme_changed=1" >> "$GITHUB_OUTPUT"
          else
            echo "::notice::No differences detected"
            echo "theme_changed=0" >> "$GITHUB_OUTPUT"
          fi

          rm current_themes.txt release_themes.txt theme_diff.txt

      - name: Generate Theme Gallery
        if: github.event_name == 'workflow_dispatch' || github.event_name == 'workflow_run' || steps.check-themes.outputs.theme_changed == '1'
        id: generate-gallery
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          normalize_name() {
            echo "$1" | sed "s/ /_/g; s/'//g; s/!//g"
          }

          # Fetch release asset list once
          RELEASE_ASSETS=$(gh release view 1 --json assets -q '.assets[].name' 2>/dev/null || echo "")

          # Create backup of current README
          cp README.md README.md.bak

          # Create temporary files
          TEMP_FILE=$(mktemp)
          GALLERY_CONTENT=$(mktemp)

          # Generate the new gallery content
          echo -e "## Theme Gallery\n" > "$GALLERY_CONTENT"

          # Initialize arrays for the grid
          declare -a themes=()

          # Process each theme folder
          for theme_dir in Themes/*/; do
            if [ -d "$theme_dir" ] && [ "$theme_dir" != "PackedThemes/" ]; then
              theme_name="${theme_dir#Themes/}"
              theme_name="${theme_name%/}"
              preview_path_gif="$theme_dir/preview.gif"
              preview_path_png="$theme_dir/preview.png"
              config_path="$theme_dir/config.json"
              normalized_theme="$(normalize_name "$theme_name")"

              if echo "$RELEASE_ASSETS" | grep -qF "${normalized_theme}.7z" && [ -f "$config_path" ] && { [ -f "$preview_path_gif" ] || [ -f "$preview_path_png" ]; }; then
                # Extract author and description from config.json
                author=$(jq -r '.author' "$config_path")
                description=$(jq -r '.description' "$config_path")

                # Determine which preview file to use
                if [ -f "$preview_path_gif" ]; then
                  preview_path="$preview_path_gif"
                else
                  preview_path="$preview_path_png"
                fi

                # Create properly encoded URLs
                preview_path=$(echo "$preview_path" | sed 's|^Themes/||')
                theme_name_encoded=$(echo "$theme_name" | sed -e 's/ /%20/g')

                preview_url="https://raw.githubusercontent.com/$GITHUB_REPOSITORY/main/Themes/${theme_name_encoded}/preview.png"
                preview_img="<img title=\"${theme_name}\" width=\"200px\" src=\"${preview_url}\" />"
                download_url="https://github.com/$GITHUB_REPOSITORY/releases/download/1/${normalized_theme}.7z"

                # Clean up preview URL (remove any double slashes except after https:)
                preview_url=$(echo "$preview_url" | sed -e 's|//|/|g' -e 's|https:/|https://|')

                # Create theme cell content
                theme_cell="<td align=\"center\" valign=\"top\" width=\"33.33%\">
                  <br/>
                  <a href=\"$download_url\">
                  $preview_img<br/>
                  <b>$theme_name</b></a><br/>
                  <small><i>$author</i></small><br/>
                  <small>$description</small><br/>
                  </td>"

                themes+=("$theme_cell")
              fi
            fi
          done
          
          # Output in grid format
          count=0
          total=${#themes[@]}
          
          echo "<table align=\"center\">" >> "$GALLERY_CONTENT"
          
          while [ $count -lt $total ]; do
            echo "<tr>" >> "$GALLERY_CONTENT"
            
            # Add up to 3 theme cells per row
            for i in {0..2}; do
              if [ $((count + i)) -lt $total ]; then
                echo "${themes[$((count + i))]}" >> "$GALLERY_CONTENT"
              fi
            done
            
            echo "</tr>" >> "$GALLERY_CONTENT"
            count=$((count + 3))
          done
          
          echo "</table>" >> "$GALLERY_CONTENT"
          
          # Extract content before Theme Gallery
          awk '/^## Theme Gallery/{exit} {print}' README.md > "$TEMP_FILE"
          
          # Add the new gallery content
          cat "$GALLERY_CONTENT" >> "$TEMP_FILE"
          
          # Add footer content
          echo -e "\nThemes here are in .7z format, you can place them into your Themes folder and spruce will automatically unzip them." >> "$TEMP_FILE"
          
          # Replace the original README
          mv "$TEMP_FILE" README.md
          
          # Compare if there were actual changes
          if ! diff README.md README.md.bak > readme_diff.txt; then
            echo "::notice::README content has changed"
            cat readme_diff.txt
            echo "readme_changed=1" >> "$GITHUB_OUTPUT"
          else
            echo "::notice::README content remains the same"
            echo "readme_changed=0" >> "$GITHUB_OUTPUT"
          fi
          
          rm README.md.bak readme_diff.txt

      - name: Commit and push changes
        if: (github.event_name == 'workflow_dispatch' || steps.check-themes.outputs.theme_changed == '1') && steps.generate-gallery.outputs.readme_changed == '1'
        run: |
          git config --local user.email "action@github.com"
          git config --local user.name "GitHub Action"
          git add README.md
          git commit -m "Update theme gallery" || echo "No changes to commit"
          git push || echo "No changes to push"