@blaasvaer/frmwrk/utils.js

My personal Node framework

/**
 * This is a utility class for the frmwrk framework.
 */

var fs = require('fs');

class Utils {
	constructor () {}

	/**
	 * Read a directory asyncronously
	 * @param  {string} dirname The name of the directory to read from.
	 * @return {Promise}         A Promise.
	 * @author Sam Blåsvær <sam@blaasvaer.dk>
	 */
	readdirAsync ( dirname ) {
// console.log("Dirname", dirname);
		return new Promise(function( resolve, reject ) {
			fs.readdir( dirname, function( err, filenames ) {
				if ( err )
					reject( err );
				else 
					resolve( filenames );
			});
		});
	}

	/**
	 * Read a file  asyncronously
	 * @param  {string} filename The name of the fiel to read.
	 * @param  {string} encoding The type of encoding to use when readig the file.
	 * @return {Promise}         A Promise.
	 * @author Sam Blåsvær <sam@blaasvaer.dk>
	 */
	readFileAsync ( filename, encoding ) {
		return new Promise(function( resolve, reject ) {
			fs.readFile(filename, encoding, function( err, data ) {
				if ( err )
					reject( err );
				else 
					resolve( data );
			});
		});
	}

	/**
	 * Get a file (passing on to async)
	 * @param  {string} filename The name of the file to read.
	 * @return {Promise} A Promise.
	 */
	getFile ( filename ) {
// console.log("getFile filename", filename);
		return this.readFileAsync( filename, 'utf8' );
	}

	/**
	 * Delay a promise for debugging
	 * @return {Function} A function returning a Promise.
	 */
	sleep ( ms ) {
		return function( x ) {
			return new Promise( resolve => setTimeout( () => resolve( x ), ms ) );
		};
	}

	/**
	 * Removes all trailing slashes from URL
	 * @param {string} url
	 * @return {string}	Return the string without trailing slashes.
	 */
	removeTrailingSlashes( url ) {
		return url.replace(/\/+$/, '');
	}

	/**
	 * Removes all starting and trailing slashes from URL
	 * @param {string} url
	 * @return {string}	Return the string without trailing slashes.
	 */
	removeStartingTrailingSlashes( url ) {
		return url.replace(/^\/+|\/+$/g, '')
	}
}

module.exports = new Utils();