Brian Grinstead bgrins

Writing an Actor

A Simple Hello World

Here's a simple Hello World actor. It is a global actor (not associated with a given browser tab).

let protocol = require("devtools/server/protocol");

let {method, Arg, Option, RetVal} = protocol;

Javascript `log` Function

Every time I start a new project, I want to pull in a log function that allows the same functionality as the console.log, including the full functionality of the Console API.

There are a lot of ways to do this, but many are lacking. A common problem with wrapper functions is that the line number that shows up next to the log is the line number of the log function itself, not where log was invoked. There are also times where the arguments get logged in a way that isn't quite the same as the native function.

This is an attempt to once and for all document the function that I pull in to new projects. There are two different options:

The full version: Inspired by the plugin in HTML5 Boilerplate. Use this if you are writing an application and want to create a window.log function. Additionally,

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

Locate the section for your github remote in the .git/config file. It looks like this:

[remote "origin"]
	fetch = +refs/heads/*:refs/remotes/origin/*
	url = git@github.com:joyent/node.git

Now add the line fetch = +refs/pull/*/head:refs/remotes/origin/pr/* to this section. Obviously, change the github url to match your project's URL. It ends up looking like this:

Working With Github Pages

The FAQ maintained by Github covers most stumbling blocks, some other tips and tricks supplied here.

Gitignore

Add _site to .gitignore. The generated site should not be uploaded to Github since its gets generated by github.

	/*
	* Running this scratchpad in chrome mode will open a devtools window that's debugging
	* the devtools window that's debugging the currently selected tab.
	*/
	let {devtools} = Components.utils.import("resource:///modules/devtools/gDevTools.jsm", {});

	let tabTarget = devtools.TargetFactory.forTab(gBrowser.selectedTab);
	let toolbox = gDevTools.getToolbox(tabTarget);

	let win = toolbox._host.frame.contentWindow;

	gifify() {
	if [[ -n "$1" ]]; then
	if [[ $2 == '--good' ]]; then
	ffmpeg -i $1 -r 10 -vcodec png out-static-%05d.png
	time convert -verbose +dither -layers Optimize -resize 600x600\> out-static*.png GIF:- \| gifsicle --colors 128 --delay=5 --loop --optimize=3 --multifile - > $1.gif
	rm out-static*.png
	else
	ffmpeg -i $1 -s 600x400 -pix_fmt rgb24 -r 10 -f gif - \| gifsicle --optimize=3 --delay=3 > $1.gif
	fi
	else

	// phantomjs --web-security=no most_used_css_property_names.js

	var urls = [
	'http://google.com',
	'http://facebook.com',
	'http://youtube.com',
	'http://yahoo.com',
	'https://github.com/',
	'http://twitter.com/',
	'http://en.wikipedia.org/wiki/Main_Page',

	//addEventListener polyfill 1.0 / Eirik Backer / MIT Licence
	(function(win, doc){
	if(win.addEventListener)return; //No need to polyfill

	function docHijack(p){var old = doc[p];doc[p] = function(v){return addListen(old(v))}}
	function addEvent(on, fn, self){
	return (self = this).attachEvent('on' + on, function(e){
	var e = e \|\| win.event;
	e.preventDefault = e.preventDefault \|\| function(){e.returnValue = false}
	e.stopPropagation = e.stopPropagation \|\| function(){e.cancelBubble = true}