Tabs to spaces using globally installed node modules

gulpfile.js

// USAGE:
// Assuming you have gulp installed globally
// npm install -g gulp-soften yargs gulp-eol gulp-trimlines path-exists
// gulp --folder public_html OR gulp --folder public_html/styles

var base = process.env.USERPROFILE + '/AppData/Roaming/',
    node_modules = base + 'npm/node_modules/';

var gulp = require(node_modules + 'gulp');

var soften     = require(node_modules + 'gulp-soften'),
    argv       = require(node_modules + 'yargs').argv,
    eol        = require(node_modules + 'gulp-eol'),
    trimlines  = require(node_modules + 'gulp-trimlines'),
    pathExists = require(node_modules + 'path-exists') //part of Node
;

var pageFileTypeArray = ['html', 'php', 'htaccess', 'scss'],
    pageFileTypes = pageFileTypeArray.join(',');

gulp.task('clean', function(){
    var isFolder = (argv.folder) ? true : false;

    if(isFolder){
        var path = argv.folder;

        if(pathExists(path)){
            console.log('Processed path: ' + path);

            return gulp.src([path + '/**/*.{' + pageFileTypes + '}'], {dot: true})
                .pipe(soften(4)) //4 spaces
                .pipe(eol('\r\n', false))
                .pipe(trimlines({ leading: false }))
                .pipe(gulp.dest(path + '/'))
            ;
        } else {
            console.error('Error: Path not found at ' + path);
        }
    } else {
        console.error('Error: --folder flag not set');
    }
});

gulp.task('default', function(){
    return gulp.start('clean');
});