gulp-ui5-eager-preload/component_preload/index.js

[](https://www.npmjs.com/package/gulp-ui5-eager-preload)

'use strict';
var PluginError = require('plugin-error');
var log = require('fancy-log');
var colors = require('ansi-colors');
var through = require('through2');
var path = require('path');

module.exports = function(options) {

  options = options || {};
  options.isLibrary = !!options.isLibrary;
  options.fileName = options.fileName || (options.isLibrary ? 'library-preload.json' : 'Component-preload.js');

  if (typeof options.base !== 'string') {
    throw new PluginError('gulp-ui5-preload', '`base` parameter required');
  }

  var firstFile;
  var preloadModules = {};

  function collectFileContentsFromStream(file, enc, done) {
    // ignore empty files
    if (file.isNull()) {
      done();
      return;
    }
    // we dont do streams (yet)
    if (file.isStream()) {
      this.emit('error', new PluginError('gulp-ui5-preload', 'File Content streams not yet supported'));
      done();
      return;
    }
    if (!firstFile && file) {
      firstFile = file;
    }

    try {

      var resolvedPath = (options.namespace ? options.namespace.split('.').join('/') + '/' : '') + path.relative(path.resolve(options.base), file.path).replace(/\\/g, '/');
      preloadModules[resolvedPath] = file.contents.toString();

    } catch (err) {
      this.emit('error', new PluginError('gulp-ui5-preload', err));
      done();
      return;
    }
    done();
  }

  function pushCombinedFileToStream(done) {

    if (!firstFile) {
      done();
      log.error('gulp-ui5-preload', colors.red('WARNING: No files were passed to gulp-ui5-preload. Wrong path?. Skipping emit of Component-preload.js...'));
      return;
    }

    log.info('gulp-ui5-preload',
      colors.magenta('number of files combined to preload file ' + options.fileName + ': ' + Object.keys(preloadModules).length)
    );

    var template = 'jQuery.sap.registerPreloadedModules(JSON_CONTENT);';
    var suffix = '.Component-preload';
    if (options.isLibrary) {
      template = 'JSON_CONTENT';
      suffix = '.library-preload';
    }

    var jsonContent = JSON.stringify(
      {
        name: options.namespace + suffix,
        version: '2.0',
        modules: preloadModules
      },
      null,
      '\t'
    );

    var contents = template.replace('JSON_CONTENT', function() {
      return jsonContent;
    });

    var preloadFile = firstFile.clone({ contents: false });
    preloadFile.contents = Buffer.from(contents, "UTF-8");
    preloadFile.path = path.join(firstFile.base, options.fileName);

    this.push(preloadFile);
    done();
  }

  return through.obj(collectFileContentsFromStream, pushCombinedFileToStream);
};