class Berkshelf::Resolver

def compute_solver_engine(berksfile)
  if berksfile.required_solver
    begin
      Solve.engine = berksfile.required_solver
    rescue Solve::Errors::InvalidEngine => e
      raise ArgumentError, e.message
    end
  elsif berksfile.preferred_solver
    begin
      Solve.engine = berksfile.preferred_solver
    rescue
      # We should log this, but Berkshelf.log.warn and Berkshelf.formatter.warn
      # both seem inappropriate here.
      # "  Preferred solver ':#{berksfile.preferred_solver}' unavailable"
    end
  end
  # We should log this, but Berkshelf.log.info and Berkshelf.formatter.msg
  # both seem inappropriate here.
  # "  Selected dependency solver engine ':#{Solve.engine}'"
end