Class: Jekyll::ExifTag

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

Instance Method Summary collapse

Constructor Details

#initialize(tag_name, params, token) ⇒ ExifTag

Returns a new instance of ExifTag.



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# File 'lib/jekyll-exiftag.rb', line 31

def initialize(tag_name, params, token)
  super
  @args = self.split_params(params)
end

Instance Method Details

#render(context) ⇒ Object 



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# File 'lib/jekyll-exiftag.rb', line 36

def render(context)
  #abort context.registers[:site].config['source'].inspect
  sources = Array.new(context.registers[:site].config['exiftag']['sources'])
  # first param is the exif tag
  tag = @args[0]

  # if a second parameter is passed, use it as a possible img source
  if @args.count > 1
    sources.unshift(@args[1])
  end
  
  # the image can be passed as the third parameter
  if @args.count > 2
    img = @args[2]
  # or be defined in the YAML Front Matter like img: <file>
  else
    img = context.environments.first["page"]["img"]
  end
  
  # first check if the given img is already the path
  if File.exist?(img)
    file_name = img
  else
  # then start testing with the sources from _config.yml
    begin
      source = sources.shift
      file_name = File.join(context.registers[:site].config['source'], source, img)
    end until File.exist?(file_name) or sources.count == 0
  end
  # try it and return empty string on failure
  begin
    exif = EXIFR::JPEG::new(file_name)
    return tag.split('.').inject(exif){|o,m| o.send(m)}
  rescue
    ""
  end
end

#split_params(params) ⇒ Object 



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# File 'lib/jekyll-exiftag.rb', line 74

def split_params(params)
  params.split(",").map(&:strip)
end