_plugins/generate-favicon.rb


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module Jekyll
  class FaviconGenerator < Generator
    safe true
    priority :high

    SIZE = 420

    def generate(site)
      svg = 'static/favicon.svg'
      png = 'static/favicon.png'
      unless File.exist? png then
        puts "Missing '#{png}', generating..."
        puts `inkscape -o #{png} -w #{SIZE} -h #{SIZE} #{svg}`
      end
    end
  end
end