ives neurogenesis

Conventional Commit Messages

See how a minor change to your commit message style can make a difference.

git commit -m"<type>(<optional scope>): <description>" \
  -m"<optional body>" \
  -m"<optional footer>"

This list is based on aliases_spec.rb.

You can see also Module: RSpec::Matchers API.

matcher	aliased to	description
a_truthy_value	be_truthy	a truthy value
a_falsey_value	be_falsey	a falsey value
be_falsy	be_falsey	be falsy
a_falsy_value	be_falsey	a falsy value

How to connect PS3 controller to a Mac or PC

This is how you connect PS3 controller to Mac OSX, PC, etc. when previously connected to a PS3. You will need a Mini USB cable. Overcome your laziness, get up of your chair, and go get one!

A big misconception is that keep holding PS button will reset the controller's pairing. It DOES NOT! From my testings, the controller keeps paring with the last machine it was CONNECTED VIA A USB CABLE.

Here are the steps:

tmux cheat sheet

(C-x means ctrl+x, M-x means alt+x)

Prefix key

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

remap prefix to Control + a

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

	require 'fiddle'

	SIZEOF_HEAP_PAGE_HEADER_STRUCT = Fiddle::SIZEOF_VOIDP

	SIZEOF_RVALUE = 40
	HEAP_PAGE_ALIGN_LOG = 14
	HEAP_PAGE_ALIGN = 1 << HEAP_PAGE_ALIGN_LOG # 2 ^ 14
	HEAP_PAGE_ALIGN_MASK = ~(~0 << HEAP_PAGE_ALIGN_LOG) # Mask for getting page address
	REQUIRED_SIZE_BY_MALLOC = Fiddle::SIZEOF_SIZE_T * 5 # padding needed by malloc
	HEAP_PAGE_SIZE = HEAP_PAGE_ALIGN - REQUIRED_SIZE_BY_MALLOC # Actual page size

	import os
	import pprint
	import fnmatch
	import time
	import subprocess

	def find_services_needing_restart():
	services = {}
	pids = [ f for f in os.listdir('/proc') if f.isdigit() and os.path.isdir(os.path.join('/proc', f)) ]

	var serialport = require('node-serialport')

	var sp = new serialport.SerialPort("/dev/ttyO3", {
	parser: serialport.parsers.raw,
	baud: 9600
	})

	sp.on('data', function(chunk) {
	console.log(chunk.toString('hex'), chunk.toString(), chunk)
	})

	#!/bin/sh

	echo "What should the Application be called (no spaces allowed e.g. GCal)?"
	read inputline
	name="$inputline"

	echo "What is the url (e.g. https://www.google.com/calendar/render)?"
	read inputline
	url="$inputline"