vitaLee

When should you use DateTime and when should you use Time?

It's a common misconception that [William Shakespeare][1] and [Miguel de Cervantes][2] died on the same day in history - so much so that UNESCO named April 23 as [World Book Day because of this fact][3]. However because England hadn't yet adopted [Gregorian Calendar Reform][4] (and wouldn't until [1752][5]) their deaths are actually 10 days apart. Since Ruby's Time class implements a [proleptic Gregorian calendar][6] and has no concept of calendar reform then there's no way to express this. This is where DateTime steps in:

>> shakespeare = DateTime.iso8601('1616-04-23', Date::ENGLAND)
=> Tue, 23 Apr 1616 00:00:00 +0000
>> cervantes = DateTime.iso8601('1616-04-23', Date::ITALY)
=> Sat, 23 Apr 1616 00:00:00 +0000

vitaLee

import withModal from 'withModal';

function MyPage({ openModal, closeModal }) {
  const onClick = () => openModal(<div>Modal content. <button onClick={this.closeModal}>close</button></div>);

  return (
    <p>
      <h1>Title</h1>
      <button onClick={onClick}>open modal</button>
    </p>

vitaLee

I highly suspect that the RSpec core team all use black backgrounds in their terminals because sometimes the colors aren’t so nice on my white terminal

I certainly use a black background. I'm not sure about the other RSpec core folks. Regardless, if there are some color changes we can make that would make output look good on a larger variety of backgrounds, we'll certainly consider that (do you have some suggested changes?). In the meantime, the colors are configurable, so you can change the colors to fit your preferences on your machine. First, create a file at

vitaLee

require "timeout"

module WaitSteps
  extend RSpec::Matchers::DSL

  matcher :become_true do
    match do |block|
      begin
        Timeout.timeout(Capybara.default_wait_time) do
          sleep(0.1) until value = block.call

vitaLee

source :rubygems

# We are not loading Active Record, nor Active Resources etc.
# We can do this in any app by simply replacing the rails gem
# by the parts we want to use.
gem "actionpack", "~> 3.2"
gem "railties",   "~> 3.2"
gem "tzinfo"

# Let's use thin

vitaLee

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:

vitaLee

defaults: &defaults
  foo: 1
  bar: 2
  baz: 3

production:
  <<: *defaults
  bar: overriden
  quz: 4

vitaLee

# RSpec 2.0 syntax Cheet Sheet by http://ApproachE.com

# defining spec within a module will automatically pick Player::MovieList as a 'subject' (see below)
module Player
	describe MovieList, "with optional description" do
		  
	  it "is pending example, so that you can write ones quickly"
	  
	  it "is already working example that we want to suspend from failing temporarily" do
		pending("working on another feature that temporarily breaks this one")

vitaLee

<?php

$logFile = 'progress_logs/%s.log';
$cmd = "/usr/local/bin/ffmpeg -i %s  -y progress_test.m4v 2> %s";

for ($i=1; $i < count($argv); $i++) {
  $video = $argv[$i];
  $log = sprintf($logFile, $video);

  exec(sprintf($cmd, $video, $log), $processOutput, $processStatus);

vitaLee

#!/usr/bin/env ruby

def video_rotation(video_path)
  `mediainfo #{video_path} | grep -i rotation`.match(/(\d+)/)
  $1.to_i
end

def video_dimensions(video_path)
  dimensions = `mediainfo #{video_path} | egrep -i 'width|height'`.scan(/([\d\s]+)pixels/)
  portrait_video?(video_path) && dimensions.reverse!