denis-sokolov/portent

'use strict';

var Promise = require('promise');

module.exports = function(stream){
    // stream-to-promise did not work, don't know why,
    // did not bother to figure out.
    return new Promise(function(resolve, reject){
        var files = [];
        stream.on('data', function(file){
            files.push(file);
        });
        stream.on('end', function(){
            if (files.length === 0)
                return resolve('');
            if (files.length > 1)
                return reject(new Error('Internal error, too many files after concat'));
            resolve(files[0].contents);
        });
        stream.on('error', reject);
    });
};