direct-dev/es5lib/techs/transporter.js

Yandex Direct dev tools

'use strict';

/** [transporter](https://github.com/direct-adv-interfaces/direct-dev/TECHS.md#transporter) */

var buildFlow = require('enb/lib/build-flow');
var require2 = require('../utils/require2');
var vow = require2('enb/node_modules/vow', 'vow');
var vowFs = require2('enb/node_modules/vow-fs', 'vow-fs');
var lodash = require('lodash');
var streamify = require('stream-array');
var enbDest = require('./transporter-plugins/enb-dest');

var cache = {};

function readFile(filePath) {
    return vowFs.read(filePath, 'utf8').then(function (contents) {
        return { path: filePath, contents: contents };
    });
}

function getCachedFile(filePath) {
    return cache[filePath] || (cache[filePath] = readFile(filePath));
}

function provideStream(paths) {
    return vow.all(paths.map(function (file) {
        return readFile(file.fullname);
    })).then(function (files) {
        return streamify(files);
    }, function (err) {
        console.log(err);
    });
}

module.exports = function (ext) {
    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};

    var transporter = buildFlow.create().name('transporter: ' + ext).target('target', '?.merged.js').defineOption('apply').useFileList(ext);

    options.noCache && (transporter = transporter.needRebuild(lodash.constant(true)));

    return transporter.builder(function (files) {
        var deferred = vow.defer();
        var plugins = [].concat(this.getOption('apply', [])).filter(Boolean);

        provideStream(files).then(function (fStream) {
            plugins.reduce(function (stream, plugin) {
                return stream.pipe(plugin);
            }, fStream).pipe(enbDest(deferred));
        });

        return deferred.promise();
    }).createTech();
};