Class: Jekyll::Webp::WebpGenerator

Inherits:
Generator
  • Object
show all
Defined in:
lib/jekyll-webp-resize/webpGenerator.rb

Instance Method Summary collapse

Instance Method Details

#generate(site) ⇒ Object 



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# File 'lib/jekyll-webp-resize/webpGenerator.rb', line 21

def generate(site)
  # Retrieve and merge the configuration from the site yml file
  @config = DEFAULT.merge(site.config['webp'] || {})

  # If disabled then simply quit
  if !@config['enabled']
    Jekyll.logger.info("WebP:", "Disabled in site.config.")
    return
  end

  # If the site destination directory has not yet been created then create it now. Otherwise, we cannot write our file there.
  Dir::mkdir(site.dest) if !File.directory? site.dest

  # Counting the number of files generated
  files_generated = 0

  # Iterate through every image in each of the image folders and create a webp image
  # if one has not been created already for that image.
  for imgdir in @config['img_dir']
    source_directory = File.join(site.source, imgdir)
    destination_directory = File.join(site.dest, imgdir)
    FileUtils::mkdir_p(destination_directory)
    Jekyll.logger.info("WebP:", "Processing #{source_directory}")

    for file in Dir[source_directory + "**/*.*"]
      prefix = File.dirname(file.sub(source_directory, ""))

      # If the file is not one of the supported formats, exit early
      extension = File.extname(file).downcase
      next if !@config['formats'].include? extension

      # Create the output file path
      filename = File.basename(file, extension) + ".webp"
      FileUtils::mkdir_p(destination_directory + prefix)
      output_full_path = File.join(destination_directory + prefix, filename)

      # Keep the webp file from being cleaned by Jekyll
      site.static_files << WebpFile.new(site,
                                        site.dest,
                                        File.join(imgdir, prefix),
                                        filename)

      # Check if the file already has a webp alternative?
      # If we're force rebuilding all webp files then ignore the check
      # also check the modified time on the files to ensure that the webp file
      # is newer than the source file, if not then regenerate
      next if File.file?(output_full_path) && File.mtime(output_full_path) > File.mtime(file)

      if File.file?(output_full_path) && File.mtime(output_full_path) <= File.mtime(file)
        Jekyll.logger.info("WebP:", "Change to source image file #{file} detected, regenerating WebP")
      end

      # Generate the file
      WebpExec.run(@config['flags'], file, output_full_path)
      files_generated += 1
    end # dir.foreach
  end # img_dir

  Jekyll.logger.info("WebP:", "Generator Complete: #{files_generated} file(s) generated")
end