Takes a stream of filenames on stdin and outputs the file contents on stdout each time a new filename is pushed.

stream-stream.js

/*
 * Takes a stream of filenames on stdin and outputs
 * the file contents on stdout each time a new filename is pushed.
 */
var _   = require('highland');
var fs  = require('fs');

function foo(filename) {
  return _(fs.createReadStream(filename)); // `sequence()` expects an highland stream so let's wrap
}

/*
 * We first split on line breaks, then map each filename to a stream of the file contents.
 * `sequence()` expects a stream of streams and concatenates it in a single output stream so we're fine :)
 * See http://highlandjs.org/#sequence
 */
_(process.stdin).split().map(foo).sequence().pipe(process.stdout);