'use strict'
|
var Duplex = require('stream').Duplex
|
var arrayify = require('array-back')
|
var assert = require('assert')
|
|
/**
|
* @module stream-connect
|
* @example
|
* const connect = require('stream-connect')
|
*/
|
module.exports = connect
|
|
/**
|
* Connect streams.
|
*
|
* @param streams {...external:Duplex} - One or more streams to connect.
|
* @return {external:Duplex}
|
* @alias module:stream-connect
|
*/
|
function connect () {
|
var streams = arrayify(arguments)
|
assert.ok(streams.length >= 2, 'Must supply at least two input stream.')
|
|
var first = streams[0]
|
var last = streams[streams.length - 1]
|
var connected = new Duplex({ objectMode: true })
|
|
streams.forEach(function (stream) {
|
stream.on('error', function (err) {
|
connected.emit('error', err)
|
})
|
})
|
|
streams.reduce(function (prev, curr) {
|
prev.pipe(curr)
|
return curr
|
})
|
|
connected._write = function (chunk, enc, done) {
|
first.write(chunk)
|
done()
|
}
|
connected._read = function () {}
|
connected
|
.on('finish', function () {
|
first.end()
|
})
|
.on('pipe', function (src) {
|
first.emit('pipe', src)
|
})
|
|
/* use flowing rather than paused mode, for node 0.10 compatibility. */
|
last
|
.on('data', function (chunk) {
|
connected.push(chunk)
|
})
|
.on('end', function () {
|
connected.push(null)
|
})
|
|
return connected
|
}
|
|
/**
|
* @external Duplex
|
* @see https://nodejs.org/api/stream.html#stream_class_stream_duplex
|
*/
|
