class KPM::Formatter

def compute_border(labels)
  border = '_'
  border = (0...labels.size).inject(border) { |res, _i| "#{res}_" }
  labels.inject(border) do |res, lbl|
    (0...lbl[:size] + 2).each { |_s| res = "#{res}_" }
    res
  end
end