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- var PassThrough = require('readable-stream').PassThrough
- var Readable = require('readable-stream').Readable
- var duplexer = require('duplexer2')
-
- module.exports = function () {
- var streams
- if(arguments.length == 1 && Array.isArray(arguments[0])) {
- streams = arguments[0]
- } else {
- streams = [].slice.call(arguments)
- }
- return combine(streams)
- }
-
- module.exports.obj = function () {
- var streams
- if(arguments.length == 1 && Array.isArray(arguments[0])) {
- streams = arguments[0]
- } else {
- streams = [].slice.call(arguments)
- }
- return combine(streams, { objectMode: true })
- }
-
-
- function combine (streams, opts) {
-
- for (var i = 0; i < streams.length; i++)
- streams[i] = wrap(streams[i], opts)
-
- if(streams.length == 0)
- return new PassThrough(opts)
- else if(streams.length == 1)
- return streams[0]
-
- var first = streams[0]
- , last = streams[streams.length - 1]
- , thepipe = duplexer(opts, first, last)
-
- //pipe all the streams together
-
- function recurse (streams) {
- if(streams.length < 2)
- return
- streams[0].pipe(streams[1])
- recurse(streams.slice(1))
- }
-
- recurse(streams)
-
- function onerror () {
- var args = [].slice.call(arguments)
- args.unshift('error')
- thepipe.emit.apply(thepipe, args)
- }
-
- //es.duplex already reemits the error from the first and last stream.
- //add a listener for the inner streams in the pipeline.
- for(var i = 1; i < streams.length - 1; i ++)
- streams[i].on('error', onerror)
-
- return thepipe
- }
-
- function wrap (tr, opts) {
- if (typeof tr.read === 'function') return tr
- return new Readable(opts).wrap(tr)
- }
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