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# Setup QEMU for x86-64 Docker images on Raspberry Pi 4
# Install Python3 and Docker first: https://dev.to/rohansawant/installing-docker-and-docker-compose-on-the-raspberry-pi-in-5-simple-steps-3mgl

# Install QUEMU (https://www.qemu.org/)
sudo apt-get install qemu binfmt-support qemu-user-static

# Use QUS in Docker (https://github.com/dbhi/qus) to configure x86_64 architecture
docker run --rm --privileged aptman/qus -s -- -p x86_64

# Test x86-64 image:

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# spec/routes/example_spec.rb
require 'spec_helper'

describe "routing for tab separation of example slug routed pages" do
  it "routes to known tab names" do
    expect( :get => "/example/far-out-man/reviews" ).to route_to(
        :controller => "directory",
        :action     =>"show_tab",
        :slug       => "far-out-man",
        :tab        => "reviews"

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# requires the bash_completion packages installed via homebrew

if [ -f /usr/local/etc/bash_completion ]; then
    . /usr/local/etc/bash_completion
fi

function __git_dirty {
  git diff --quiet HEAD &>/dev/null 
  [ $? == 1 ] && echo "!"
}

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Bundler for the TL;DR impaired

If you'd like a full description, read at the very least the "Understanding Bundler" section of http://gembundler.com

Commands

bundle install - This command is your meat-and-potatoes-everyday command, use

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# Get your spec rake tasks working in RSpec 2.0

require 'rspec/core/rake_task'

desc 'Default: run specs.'
task :default => :spec

desc "Run specs"
RSpec::Core::RakeTask.new do |t|
  t.pattern = "./spec/**/*_spec.rb" # don't need this, it's default.

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require 'sinatra'

get '/process' do
  erb :process
end

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require 'rfile'

f = RFile.new('path/to/some/file')
  
f.line(6) #=> "the 6th line in the file"

f.each do |l|
  # ordered iteration of each line in the file (IO intensive)
end
  

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# db/migrate/01_add_custom_admin_roles.rb

class AddCustomAdminRoles < ActiveRecord::Migration
  @roles = %w[extra]
  def self.up
    @roles.each do |r|
      Role.create(:name => r)
    end
  end

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<!-- app/views/orders/_add_dialog.html.erb -->

<div id="add_to_cart_dialog">
  Your item(s) have been added. You now have <%= order.item_count %> 
  items valued at <%= number_to_currency order.item_total %> in your cart.<br/>
  <div id="buttons" style="margin-top: 10px; width: 100%;">
    <button id="continue_shopping_button" style="float: left;" type="button">Continue Shopping (10)</button>
    <button id="view_cart_button" style="margin-left: 10px; float: left;clear: right;" type="button">Checkout Now</button>
  </div>
</div>

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function dotimes(amount) {
  $('button#continue_shopping_button').html("Continue Shopping (" + amount + ")");
  if (amount == 0 ) {
    $('button#continue_shopping_button').trigger('click');
    return;
  } else {
    amount = amount - 1;
    setTimeout("dotimes(" + amount + ")", 1000);
  }