Module: Jekyll::Filters::Thumbnail

Defined in:
lib/jekyll/filters/thumbnail.rb

Overview

Liquid filter for use in templates

Instance Method Summary collapse

Instance Method Details

#thumbnail(input, width = nil, height = nil, crop = nil, auto_rotate = nil) ⇒ Object

Generates a thumbnail and returns its alternate destination



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# File 'lib/jekyll/filters/thumbnail.rb', line 8

def thumbnail(input, width = nil, height = nil, crop = nil, auto_rotate = nil)
  return input unless input
  return input if input.downcase.end_with? '.gif'
  return input unless Jekyll.env == 'production'

  path = @context.registers[:site].in_source_dir input

  unless ::File.exist? path
    Jekyll.logger.warn "File doesn't exist #{input}"
    return input
  end

  image = Jekyll::Images::Cache.cached_image path
  thumb = image.thumbnail(width: width,
                          height: height,
                          crop: crop,
                          auto_rotate: auto_rotate)

  thumb.write && thumb.optimize

  thumb.url
rescue Vips::Error => e
  Jekyll.logger.warn "Failed to process #{input}: #{e.message}"
  input
end