Module: JekyllAutoThumbnails::Hooks

Defined in:
lib/jekyll-auto-thumbnails/hooks.rb

Overview

Jekyll hook integration

Class Method Summary collapse

Class Method Details

.copy_thumbnails(site) ⇒ Object

Copy thumbnails from cache to _site

Parameters:

  • site (Jekyll::Site) —

    Jekyll site



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# File 'lib/jekyll-auto-thumbnails/hooks.rb', line 86

def self.copy_thumbnails(site)
  config = site.data["auto_thumbnails_config"]
  return unless config&.enabled?

  url_map = site.data["auto_thumbnails_url_map"]
  return unless url_map && !url_map.empty?

  Jekyll.logger.info "AutoThumbnails:", "Copying #{url_map.size} thumbnails to _site"

  url_map.each_value do |thumb_url|
    thumb_filename = File.basename(thumb_url)
    cached_path = File.join(config.cache_dir, thumb_filename)

    # Build destination path in _site preserving directory structure
    dest_path = File.join(site.dest, thumb_url)
    dest_dir = File.dirname(dest_path)

    FileUtils.mkdir_p(dest_dir)
    FileUtils.cp(cached_path, dest_path)
  end

  Jekyll.logger.info "AutoThumbnails:", "All thumbnails copied"
end

.html_document?(doc) ⇒ Boolean

Check if a document outputs HTML (not CSS, JS, etc.)

Parameters:

  • doc (Jekyll::Document, Jekyll::Page) —

    the document to check

Returns:

  • (Boolean) —

    true if the document outputs HTML



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# File 'lib/jekyll-auto-thumbnails/hooks.rb', line 145

def self.html_document?(doc)
  ext = File.extname(doc.path || doc.url || "").downcase
  [".html", ".htm", ".md", ".markdown"].include?(ext)
end

.initialize_system(site) ⇒ Object

Initialize optimization system

Parameters:

  • site (Jekyll::Site) —

    Jekyll site



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# File 'lib/jekyll-auto-thumbnails/hooks.rb', line 11

def self.initialize_system(site)
  config = Configuration.new(site)
  return unless config.enabled?

  site.data["auto_thumbnails_config"] = config
  site.data["auto_thumbnails_registry"] = Registry.new
  site.data["auto_thumbnails_generator"] = Generator.new(config, site.source)

  Jekyll.logger.info "AutoThumbnails:", "System initialized"
end

.process_site(site) ⇒ Object

Process site - scan, generate, replace

Parameters:

  • site (Jekyll::Site) —

    Jekyll site



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# File 'lib/jekyll-auto-thumbnails/hooks.rb', line 25

def self.process_site(site)
  config = site.data["auto_thumbnails_config"]
  return unless config&.enabled?

  registry = site.data["auto_thumbnails_registry"]
  generator = site.data["auto_thumbnails_generator"]

  # Check ImageMagick
  unless generator.imagemagick_available?
    Jekyll.logger.warn "AutoThumbnails:", "ImageMagick not found - skipping"
    return
  end

  # Scan all documents and pages
  (site.documents + site.pages).each do |doc|
    next unless doc.output
    next unless html_document?(doc)

    Scanner.scan_html(doc.output, registry, config, site.source)
  end

  Jekyll.logger.info "AutoThumbnails:", "Found #{registry.entries.size} images to optimize"

  # Generate thumbnails
  url_map = {}
  registry.entries.each do |url, requirements|
    cached_path = generator.generate(url, requirements[:width], requirements[:height])

    if cached_path
      # Build thumbnail URL (use forward slashes for URLs, not File.join)
      thumb_filename = File.basename(cached_path)
      url_dir = File.dirname(url)
      # Ensure URL uses forward slashes (cross-platform URLs)
      thumb_url = if url_dir == "."
                    "/#{thumb_filename}"
                  else
                    "#{url_dir}/#{thumb_filename}"
                  end
      url_map[url] = thumb_url
    else
      Jekyll.logger.warn "AutoThumbnails:", "Failed to generate thumbnail for #{url}"
    end
  end

  # Store url_map for post_write hook
  site.data["auto_thumbnails_url_map"] = url_map

  # Replace URLs in HTML
  (site.documents + site.pages).each do |doc|
    next unless doc.output
    next unless html_document?(doc)

    doc.output = replace_urls(doc.output, url_map, parser: config.parser)
  end

  Jekyll.logger.info "AutoThumbnails:", "Generated #{url_map.size} thumbnails"
end

.replace_urls(html, url_map, parser: :html5) ⇒ String

Replace image URLs in HTML.

Returns the input string unchanged (object identity) when no replacement was actually made. This is both a perf win for pages with no matching images and a correctness win: the HTML4 path otherwise round-trips every page through libxml2's serializer, which injects a spurious <meta http-equiv="Content-Type"> on HTML5 sites.

Parameters:

  • html (String) —

    HTML content

  • url_map (Hash) —

    original URL => thumbnail URL

  • parser (Symbol) (defaults to: :html5) —

    :html5 (default) or :html4

Returns:

  • (String) —

    modified HTML (or the input itself, unchanged)



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# File 'lib/jekyll-auto-thumbnails/hooks.rb', line 122

def self.replace_urls(html, url_map, parser: :html5)
  return html if url_map.empty?
  return html unless html.match?(/<img/i)

  doc = HtmlParser.parse(html, parser)

  modified = false
  doc.css("article img").each do |img|
    src = img["src"]
    thumb_url = url_map[src]
    next unless thumb_url

    img["src"] = thumb_url
    modified = true
  end

  modified ? doc.to_html : html
end