tom quas tomquas

Raspberry Pi Zero OTG Mode

Simple guide for setting up OTG modes on the Raspberry Pi Zero - By Andrew Mulholland (gbaman).

The Raspberry Pi Zero (and model A and A+) support USB On The Go, given the processor is connected directly to the USB port, unlike on the B, B+ or Pi 2 B, which goes via a USB hub.
Because of this, if setup to, the Pi can act as a USB slave instead, providing virtual serial (a terminal), virtual ethernet, virtual mass storage device (pendrive) or even other virtual devices like HID, MIDI, or act as a virtual webcam!
It is important to note that, although the model A and A+ can support being a USB slave, they are missing the ID pin (is tied to ground internally) so are unable to dynamically switch between USB master/slave mode. As such, they default to USB master mode. There is no easy way to change this right now.
It is also important to note, that a USB to UART serial adapter is not needed for any of these guides, as may be documented elsewhere across the int

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

How to set up user authentication for a Chrome Extension using the Chrome Identity API

Create a private key file, from which you can create the manifest key and Application ID, as detailed here: https://stackoverflow.com/questions/23873623/obtaining-chrome-extension-id-for-development
Add the manifest key to "key" in manifest.json
Create a new project in Google Developer Console https://console.developers.google.com/project
Go to "APIs & auth > Credentials" and create new client id for a Chrome Application using the Application ID generated in step 3.
Copy the Client ID to oauth2.client_id in the manifest.json

	CRYSTAL = crystal
	UNAME = "$(shell uname -ms)"
	LIBRARY_PATH = $(shell brew --prefix crystal-lang)/embedded/lib
	LIBS = -levent -lpcl -lpcre -lgc -lpthread
	LDFLAGS = -Wl,-undefined,dynamic_lookup

	TARGET = crystal_example_ext.bundle

	$(TARGET): crystal_example_ext.o
	$(CC) -bundle -L$(LIBRARY_PATH) -o $@ $^ $(LIBS) $(LDFLAGS)

	module.exports = function(duration) {
	return function(){
	return new Promise(function(resolve, reject){
	setTimeout(function(){
	resolve();
	}, duration)
	});
	};
	};

	#!/usr/bin/env bash
	# vim: set filetype=ruby:
	# b - browse Chrome bookmarks with fzf

	[ $(uname) = Darwin ] \|\| exit 1
	which fzf > /dev/null 2>&1 \|\| brew reinstall --HEAD fzf \|\| exit 1

	/usr/bin/ruby -x "$0" \|
	fzf-tmux -u 30% --ansi --multi --no-hscroll --tiebreak=begin \|
	awk 'BEGIN { FS = "\t" } { print $2 }' \|

	// ViewController.swift

	import UIKit
	import WebKit

	class ViewController: UIViewController, WKNavigationDelegate {
	@IBOutlet var containerView: UIView!
	var webView: WKWebView?

	override func loadView() {

	<!DOCTYPE html>
	<html>
	<head>
	<title>Basemaps \| CartoDB.js</title>
	<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
	<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
	<link rel="shortcut icon" href="http://cartodb.com/assets/favicon.ico" />
	<style>
	html, body, .map {
	height: 200px;