class InvocaGems::GemspecLine
  attr_reader :gemspec, :gem_name, :line, :index, :prefix

  def initialize(gemspec, gem_name, line, index)
    @gemspec = gemspec
    @gem_name = gem_name
    @line = line
    @index = index
    @prefix = @line.match(/\A(\s*\S+\s+)[\'\"]/)[1]
  end

  def save!
    gemspec.save!(self)
  end

  def update_version(new_version)
    @line = "#{@prefix}'#{gem_name}', '#{new_version}'"
  end
end