Pipe and Unpipe streams
As of node 0.8.x, there is no way to unpipe streams. This module attemps to fill the gap by providing a
pipe(source, destination[, options]) and
unpipe(source, destination) functions working in tandem, to do piping and unpiping of streams.
npm install pup
Two functions are provided:
pipe(source, destination[, options]): to be used to setup a pipe from source to destination. Same signature as the Stream#pipe method.
unpipe(source, destination): remove the pipe between source and destination. If there are many of those, only the first one is removed. Return
trueon successful removal,
var fs = require('fs') var pup = require('pup') var source = fs.readFileStream('test') var wrong_destination = fs.readWriteStream('test2') var destination = fs.readWriteStream('test.bak') // Pipe to one destination source.pause() pup.pipe(source, wrong_destination) // Then remove it and pipe to another pup.unpipe(source, wrong_destination) pup.pipe(source, destination) // Copy the file test.js, which should only end up in test.bak source.resume()
This is a bit of a hack that relies on the assumption that there is the same
cleanup() listener setup by the Stream#pipe method for the
end event on the source and on the destination.