JosePedroDias’s gists

JosePedroDias / print_stack_trace.js

Created February 10, 2014 21:04

print stack trace on JS anywhere

	var printStackTrace = function(msg) {
	try {
	var ex = new Error(msg);
	console.log(ex);
	} catch (ex) {}
	};

JosePedroDias / jsonp.js

Last active August 29, 2015 13:56

	window.jsonpCbs = {};

	var jsonp = function(uri, cb) {
	var key = 'cb' + Math.floor( Math.random() * 100000 );

	var cb2 = function() {
	delete window.jsonpCbs[key];
	cb.apply(null, arguments);
	};

JosePedroDias / ajax.js

Last active August 29, 2015 13:56

simple AJAX

	var ajax = function(uri, cb) {
	var xhr = new XMLHttpRequest();
	//xhr.withCredentials = true; // uncomment to send cookies and stuff
	xhr.open('POST', uri, true); // GET OR POST...
	var cbInner = function() {
	if (xhr.readyState === 4 && xhr.status === 200) {
	return cb(null, JSON.parse(xhr.response));
	}
	cb('error requesting ' + uri);
	};

JosePedroDias / callbackFnCatchingExceptions.js

Last active August 29, 2015 13:57

try...catch around functionWithCallbackWorkflow so it doesn't mess with your logic

	var functionWithCallbackWorkflow = function(arg1, arg2, cb) {
	try {
	// DO STUFF, generating res
	} catch (ex) {
	return cb(ex);
	}
	cb(null, res);
	};

JosePedroDias / generic_export_recipe.js

Last active February 11, 2024 23:06

recipe to expose a JS module for CommonJS, AMD and global namespace

	(function(context) {
	'use strict';

	var modName = 'stuff'; // used only if mod is a function and no CommonJS or AMD supported

	// define your module here... can be a function or an object
	var mod = {};

	// export
	if (typeof module === 'object' && module.exports) { // CommonJS

JosePedroDias / minifycss.js

Created March 17, 2014 14:09

minifies css rules (string). naive approach (doesn't interpret anything)

	var minifyCss = function(s) {
	s = s.replace('\n', ''); // remove newlines
	s = s.replace(/\s+/g, ' '); // several whitespace to 1 spacebar
	s = s.replace(/\s([:;,{}])\s/g, '$1'); // strips whitespace around :;,{} characters
	s = s.replace(/\/\(.\|[\r\n])?\\//g, ''); // uses non-greedy matching ? to remove comments
	return s;
	};

JosePedroDias / node-canvas-http.js

Created March 19, 2014 02:25

generates image using node canvas module on server

	// https://github.com/learnboost/node-canvas
	// https://github.com/LearnBoost/node-canvas/wiki
	// sudo apt-get install libcairo2-dev
	// npm install canvas

	var http = require('http');
	var url = require('url');
	var Canvas = require('canvas');

	// http://stage.sl.pt:8080/?t=hi%20there

JosePedroDias / chars-charcodes.js

Created March 28, 2014 00:15

	'\n'.charCodeAt(0); // 10
	String.fromCharCode(10); // '\n'

JosePedroDias / parseXSV.js

Last active August 29, 2015 13:57

Proper TSV/CSV parsing. toObjects uses first line as header and converts lines into objects. sep defaults to '\t', use ',' instead for CSV.

	var parseXSV = function(str, toObjects, sep) {
	if (!sep) { sep = '\t'; }

	var chars = str.split('');

	var lst = [];
	var elem = [];
	var field = [];
	var inComplexField = false;

JosePedroDias / serveMedia.js

Last active August 29, 2015 14:01

serve media (static server with ranged request support)

	/**
	* serves media files in the directory.
	* by default won't refresh on file changes, use nodemon if you want that behavior
	* 2014, [email protected]
	*/



	var http = require('http'),
	fs = require('fs'),

José Pedro Dias JosePedroDias