Gulp task to make gulp wiredep use all minified (.min/-min) files

gulp-wiredep-min.js

/*
* Author: Laurent Debacker
* https://belgocanadian.com
* Creation Date: 18-Oct-2017
* Description: Gulp task to make gulp wiredep use all minified (.min/-min) files 
* Note: Some bower componenents do not have a bower.json file. For those the minified files will not be picked. Alternatively you can create a bower.json file for those.
*/

var fs = require('fs');
var path = require('path');
var gulp = require('gulp');
var bower = require('gulp-bower');
var wiredep = require('gulp-wiredep');

gulp.task('bower', function() {
  //Get all the bower.json files in "bower_components"
  var bowerFiles = getFiles('bower_components');
  for (var i in bowerFiles) {
    //Read every bower.json file
    var bower = JSON.parse(fs.readFileSync(bowerFiles[i], 'utf8'));
    //Save the path of where the bower.json file is located
    var bowerPath = path.resolve(bowerFiles[i].substring(0, bowerFiles[i].lastIndexOf('/')));
    if (bower.main) {
      //bower.main is either a string or an array
      if (typeof(bower.main) === 'object') {
        for (var j in bower.main) {
          bower.main[j] = checkMinFile(bowerPath, bower.main[j]);
        }
      } else {
        bower.main = checkMinFile(bowerPath, bower.main);
      }
      //Write the new main (pointing to the min file) in the bower file
      fs.writeFileSync(bowerFiles[i], JSON.stringify(bower), 'utf8');
    }
  }

  //This executes the standard wiredep functionality t
  gulp.src('./layouts/index.html')
    .pipe(wiredep())
    .pipe(gulp.dest('dist'));
});

//Function that determines whether there is a .min/-min alternative
function checkMinFile (bowerPath, filePath) {
  var initialPath = filePath.substring(0, filePath.lastIndexOf('/') + 1);
  var filename = filePath.substring(filePath.lastIndexOf('/') + 1);
  //Only execute if the current file is not already a minified file
  if (filePath.indexOf('min.') <= 0) {
    //Check .min
    var minFilePath = filePath.substring(0, filePath.lastIndexOf('.')) + '.min' + filePath.substring(filePath.lastIndexOf('.'));
    if (fs.existsSync(path.resolve(bowerPath + '/' + minFilePath))) {
      filename = filename.substring(0, filename.lastIndexOf('.')) + '.min' + filename.substring(filename.lastIndexOf('.'));
    } else {
      //Check -min
      minFilePath = filePath.substring(0, filePath.lastIndexOf('.')) + '-min' + filePath.substring(filePath.lastIndexOf('.'));
      if (fs.existsSync(path.resolve(bowerPath + '/' + minFilePath))) {
        filename = filename.substring(0, filename.lastIndexOf('.')) + '-min' + filename.substring(filename.lastIndexOf('.'));
      }
    }
  }
  return initialPath + filename;
}

//Generic recursive function to loop through a folder structure
function getFiles (dir, files_){
  files_ = files_ || [];
  var files = fs.readdirSync(dir);
  for (var i in files){
    var name = dir + '/' + files[i];
    if (fs.statSync(name).isDirectory()){
      getFiles(name, files_);
    } else {
      //Adjusted here to only add bower.json files
      if (name.indexOf('bower.json') > 0) {
        files_.push(name);
      }
    }
  }
  return files_;
}