Class: Jekyll::JekyllThumbnailImg

Inherits:
Liquid::Tag
  • Object
show all
Defined in:
lib/jekyll-thumbnail-img.rb

Instance Method Summary collapse

Constructor Details

#initialize(tag_name, markup, tokens) ⇒ JekyllThumbnailImg

Returns a new instance of JekyllThumbnailImg.



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# File 'lib/jekyll-thumbnail-img.rb', line 6

def initialize(tag_name, markup, tokens)
  super
  @markup = markup
end

Instance Method Details

#render(context) ⇒ Object 



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# File 'lib/jekyll-thumbnail-img.rb', line 11

def render(context)
  source, width = @markup.split(" ").map(&:strip)

  # Check if the source is a Liquid variable and attempt to resolve it
  if context[source]
    source = context[source]
  end
  unless source && width
    raise "Usage: {% thumbnail_img /path/to/local/image.png 500 %}"
  end

  source_path = File.join(context.registers[:site].source, source)

  # Check if the source file exists
  unless File.exist?(source_path)
    raise "File #{source} could not be found"
  end

  # Calculate the relative path to the 'thumbnails' directory
  relative_dest_dir = File.join(File.dirname(source), "thumbnails")

  # Create the 'thumbnails' directory within the source directory
  dest_dir = File.join(context.registers[:site].source, relative_dest_dir)
  Dir.mkdir(dest_dir) unless Dir.exist?(dest_dir)

  ext = File.extname(source)
  dest = File.join(relative_dest_dir, File.basename(source, ext) + "_#{width}w#{ext}")

  # Generate the thumbnail if it doesn't exist or if the source file was modified more recently than the thumbnail
  full_dest_path = File.join(context.registers[:site].source, dest)
  if !File.exist?(full_dest_path) || File.mtime(full_dest_path) <= File.mtime(source_path)
    image = MiniMagick::Image.open(source_path)
    image.resize("#{width}x")
    image.write(full_dest_path)
    Jekyll.logger.info "JekyllThumbnailImg", "Generating: " + File.join(context.registers[:site].source, dest)
    context["site"]["static_files"] << StaticFile.new(
      context.registers[:site],
      context.registers[:site].source,
      @dir,
      dest
    )
  end
  dest
end