module HTMLProofer

def check_directories(directories, options = {})
  raise ArgumentError unless directories.is_a?(Array)
  options[:type] = :directory
  directories.each do |directory|
    raise ArgumentError, "#{directory} does not exist" unless Dir.exist?(directory)
  end
  HTMLProofer::Runner.new(directories, options)
end

def check_directory(directory, options = {})
  raise ArgumentError unless directory.is_a?(String)
  raise ArgumentError, "#{directory} does not exist" unless Dir.exist?(directory)
  options[:type] = :directory
  HTMLProofer::Runner.new([directory], options)
end

def check_file(file, options = {})
  raise ArgumentError, "File isn't a string" unless file.is_a?(String)
  raise ArgumentError, "#{file} does not exist" unless File.exist?(file)
  options[:type] = :file
  HTMLProofer::Runner.new(file, options)
end

def check_links(links, options = {})
  raise ArgumentError unless links.is_a?(Array)
  options[:type] = :links
  HTMLProofer::Runner.new(links, options)
end