mat813

def lines_grid(s1=10, s2=100)
  save_graphics_state do
    stroke_color('EEEEEE')
    fill_color('000000')
    stroke do
      line_width(0.5)
      0.step(bounds.right, s1).each do |i|
        line([i, 0], [i, bounds.top]) if (i%s2 != 0)
      end
      0.step(bounds.top, s1).each do |i|

mat813

def stretch_box(ratio, point, options, &block)
  x, y = if ratio.is_a?(Array)
           ratio.map(&:to_f)
         else
           [ratio.to_f, 1.0]
         end
  options[:width] = options[:width] / x
  options[:height] = options[:height] / y if options.key?(:height)
  point[0] += bounds.absolute_left
  point[1] += bounds.absolute_bottom

mat813

module Jekyll
  module Filters
    def summarize(str, splitstr = /\s*<div id="extended">/)
      str.split(splitstr)[0]
    end
  end
end