require 'optparse'
require 'nkf'

# Default option
params = {output_encoding: 'SJIS', input_encoding: 'AUTO'}

opt = OptionParser.new
opt.banner = "Usage: #{File.basename(__FILE__, '.rb')} [options]"
opt.on("-i", "--input encoding", "(default: #{params[:input_encoding]})") {|v| params[:input_encoding] = v.upcase}
opt.on("-o", "--output encoding", "(default: #{params[:output_encoding]})") {|v| params[:output_encoding] = v.upcase}
opt.parse!(ARGV)

while line = $stdin.gets
	input_encoding = ('AUTO' == params[:input_encoding] ? NKF.guess(line) : params[:input_encoding])
	print line.encode(params[:output_encoding], input_encoding)
end