[DOC] Downloadable PDF Developer Guides

Signed-off-by: Arya Soni <[email protected]>

Author: aryasoni98

Gemfile

@@ -47,6 +47,9 @@ gem 'typhoeus'
 gem 'activesupport', '~> 7'
 gem 'mustache', '~> 1'
 
+# PDF Generator
+gem 'grover', '~> 1.3'
+
 group :development, :test do
   gem 'rspec'
   gem 'rubocop', '~> 1.44', require: false

_config.yml

@@ -329,11 +329,36 @@ plugins:
   - jekyll-redirect-from
   - jekyll-sitemap
   - jekyll-spec-insert
+  - pdf_generator_loader
 
 # This format has to conform to RFC822
 last-modified-at:
   date-format: '%a, %d %b %Y %H:%M:%S %z'
 
+# PDF Generator Configuration
+pdf_generator:
+  enabled: true
+  # Generate PDFs for entire collections
+  collections:
+    - getting-started
+    - install-and-configure
+    - api-reference
+    - query-dsl
+    - aggregations
+    - mappings
+    - analyzers
+  # Generate PDFs for specific guides (more granular control)
+  guides:
+    - name: "Getting Started Guide"
+      collection: getting-started
+      filename: "getting-started-guide.pdf"
+    - name: "Installation Guide"
+      collection: install-and-configure
+      filename: "installation-guide.pdf"
+    - name: "API Reference"
+      collection: api-reference
+      filename: "api-reference.pdf"
+
 # Exclude from processing.
 # The following items will not be processed, by default. Create a custom list
 # to override the default setting.

_pdf_generator/README.md

@@ -0,0 +1,88 @@
+# PDF Generator for OpenSearch Documentation
+
+This plugin generates PDF versions of documentation collections during the Jekyll build process.
+
+## File Structure
+
+All PDF generator code is contained in the `_pdf_generator/` directory:
+- `pdf_generator.rb` - Main plugin implementation
+- `README.md` - This documentation file
+
+A minimal loader file exists in `_plugins/pdf_generator_loader.rb` to ensure Jekyll loads the plugin (Jekyll requires plugins to be in `_plugins` or be gems).
+
+## Overview
+
+The PDF generator creates downloadable PDF files for documentation collections and guides. PDFs are generated automatically during the Jekyll build and are saved to the `pdfs/` directory in the site destination.
+
+## Configuration
+
+PDF generation is configured in `_config.yml` under the `pdf_generator` section:
+
+```yaml
+pdf_generator:
+  enabled: true
+  # Generate PDFs for entire collections
+  collections:
+    - getting-started
+    - install-and-configure
+    - api-reference
+  # Generate PDFs for specific guides (more granular control)
+  guides:
+    - name: "Getting Started Guide"
+      collection: getting-started
+      filename: "getting-started-guide.pdf"
+    - name: "Installation Guide"
+      collection: install-and-configure
+      filename: "installation-guide.pdf"
+```
+
+### Configuration Options
+
+- `enabled`: Set to `true` to enable PDF generation, `false` to disable
+- `collections`: Array of collection names to generate PDFs for (PDF filename will be `{collection-name}.pdf`)
+- `guides`: Array of guide configurations with:
+  - `name`: Display name for the guide
+  - `collection`: Collection name to generate PDF from
+  - `filename`: Output PDF filename (optional, defaults to `{name}.pdf`)
+  - `start_page`: Optional URL or path to start from (for partial guides)
+
+## How It Works
+
+1. During Jekyll build, the PDF generator plugin identifies configured collections/guides
+2. After all pages are rendered, the plugin collects the rendered HTML content
+3. HTML is cleaned and formatted for PDF output
+4. PDFs are generated using Grover (Puppeteer-based PDF generation)
+5. PDFs are saved to `_site/pdfs/` directory
+
+## Dependencies
+
+- `grover` gem: Ruby wrapper for Puppeteer (requires Node.js and Chrome/Chromium)
+- `puppeteer`: Node.js package (installed automatically by grover)
+
+## Accessing Generated PDFs
+
+Generated PDFs are available at:
+- Local build: `http://localhost:4000/pdfs/{filename}.pdf`
+- Production: `https://docs.opensearch.org/pdfs/{filename}.pdf`
+
+## Troubleshooting
+
+### PDF Generation Fails
+
+1. Ensure `grover` gem is installed: `bundle install`
+2. Ensure Node.js is installed (required for Puppeteer)
+3. Check Jekyll build logs for error messages
+4. Verify collection names in configuration match actual collection names
+
+### PDF Content Issues
+
+- The plugin automatically extracts main content and removes navigation elements
+- If content is missing, check that documents have `title` and are not excluded with `nav_exclude: true`
+- Documents are sorted by `nav_order` if available
+
+## Customization
+
+PDF styling can be customized by modifying the `pdf_styles` method in `pdf_generator.rb`.
+
+PDF options (page size, margins, headers/footers) can be customized in the `pdf_options` method.
+