es.duplex = function (writer, reader) {
var thepipe = new Stream()
thepipe.__defineGetter__('writable', function () { return writer.writable })
thepipe.__defineGetter__('readable', function () { return reader.readable })
;['write', 'end', 'close'].forEach(function (func) {
thepipe[func] = function () {
return writer[func].apply(writer, arguments)
}
})
;['resume', 'pause'].forEach(function (func) {
thepipe[func] = function () {
thepipe.emit(func)
if(reader[func])
return reader[func].apply(reader, arguments)
else
reader.emit(func)
}
})
;['data', 'close'].forEach(function (event) {
reader.on(event, function () {
var args = [].slice.call(arguments)
args.unshift(event)
thepipe.emit.apply(thepipe, args)
})
})
//only emit end once
var ended = false
reader.on('end', function () {
if(ended) return
ended = true
var args = [].slice.call(arguments)
args.unshift('end')
thepipe.emit.apply(thepipe, args)
})
return thepipe
}