|cp866 support for 'readline-sync'|.coffee

conv	= require 'iconv-lite'

# ~/Generic patcher proc/~
patch866 = (proc, args...) ->
	decoder_tmp	= (encoding = 'utf8', start, end) ->
		Δ866 iconv.decode, new Buffer(@, start, end), encoding
	proc_swap	= () ->
		[Buffer.prototype.toString, decoder_tmp] = [decoder_tmp, Buffer.prototype.toString]
	Δ866		= (proc, args...) ->
		[proc_swap(), proc(args...), proc_swap()][1]
	Δ866 proc, args...
# ~/Specific patcher proc/~
question_fix = (old_proc, query = '', options = {}, args...) ->
	if query then process.stdout.write query
	options.encoding = 'cp866' unless options.encoding?
	patch866 old_proc, '', options, args...

# =Usage sample=
rl = require('readline-sync')
rl.question = question_fix.bind(rl, rl.question)

user_name = rl.question "Как вас зовут ? "
console.log "Hello, #{user_name} !"