jlyonsmith

# http://www.mono-project.com/Compiling_Mono_on_OSX

require 'formula'

class Mono < Formula
  url 'http://download.mono-project.com/sources/mono/mono-3.2.3.tar.bz2'
  homepage 'http://www.mono-project.com/'
  sha1 'e356280ae45beaac6476824d551b094cd12e03b9'

  def install

jlyonsmith

git branch -r --merged | grep origin | grep -v '>' | grep -v master | xargs -L1 | ruby -e 'ARGF.each { |line| a = line.match(/(?:[^\/]*)\/(.*)/).captures; puts a }' | xargs git push origin --delete

jlyonsmith

let alert = UIAlertController(title: "Title", message: "Message", preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "Save", style: .default, handler: { (action: UIAlertAction!) in
    debugPrint("Saved")
}))
    
alert.addAction(UIAlertAction(title: "Cancel", style: .default, handler: { (action: UIAlertAction!) in
    debugPrint("Cancel")
}))
    
present(alert, animated: true, completion: nil)

jlyonsmith

#!/usr/bin/env ruby
# Requires ImageMagick: http://www.imagemagick.org/
# Requires GhostScript: http://www.ghostscript.com/

require 'fileutils'

if ARGV.count < 2 then
  puts "Usage: #{File.basename(__FILE__)} <pdf-file> [<pdf-file> ...] <project-folder>"
  exit 1
end

jlyonsmith

t = 236 # seconds
Time.at(t).utc.strftime("%H:%M:%S")
=> "00:03:56"

# Reference
# http://stackoverflow.com/questions/3963930/ruby-rails-how-to-convert-seconds-to-time

jlyonsmith

navigator.serviceWorker.getRegistrations().then(function (registrations) {
  if (!registrations.length) {
    console.log('No serviceWorker registrations found.')
    return
  }
  for(let registration of registrations) {
    registration.unregister().then(function (boolean) {
      console.log(
        (boolean ? 'Successfully unregistered' : 'Failed to unregister'), 'ServiceWorkerRegistration\n' +
        (registration.installing ? '  .installing.scriptURL = ' + registration.installing.scriptURL + '\n' : '') +

jlyonsmith

# Example nginx + git HTTP Smart mode (git-http-backend) + HTTP Authentication + HTTPS redirect
# jeroen@massar.ch - http://jeroen.massar.ch
 
server {
  listen  192.0.1.1:80;
  listen  [2001:db8::1]:80;
 
  # Redirect all non-HTTPS traffic to the HTTPS variant
  return 301 https://$host$request_uri;
}

jlyonsmith

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

jlyonsmith

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

jlyonsmith

# Add this snippet to the top of your playbook. 
# It will install python2 if missing (but checks first so no expensive repeated apt updates)
# gwillem@gmail.com

- hosts: all
  gather_facts: False
  
  tasks:
  - name: install python 2
    raw: test -e /usr/bin/python || (apt -y update && apt install -y python-minimal)