class Glpk < Solver
  def solve(open_solution=false)
    `#{executable} --lp #{@filename} --write #{@outfile}`
    `open #{@outfile}` if open_solution
  end

  def executable
    :glpsol
  end

  def store_results(variables)
    rows = IO.read(@outfile).split("\n")
    variables.zip(rows[-variables.count..-1]).each do |var, row|
      cols = row.split(" ")
      var.value = cols[[1, cols.count - 1].min].to_f
    end
    return rows[1].split(" ")[-1]
  end
end