Interesting .irbrc hacks, including getting logging to your console, making easy calls to the app from the console, easy loading of accounts

.irbrc

ANSI = {}
  ANSI[:RESET]     = "\e[0m"
  ANSI[:BOLD]      = "\e[1m"
  ANSI[:UNDERLINE] = "\e[4m"
  ANSI[:LGRAY]     = "\e[0;37m"
  ANSI[:GRAY]      = "\e[1;30m"
  ANSI[:RED]       = "\e[31m"
  ANSI[:GREEN]     = "\e[32m"
  ANSI[:YELLOW]    = "\e[33m"
  ANSI[:BLUE]      = "\e[34m"
  ANSI[:MAGENTA]   = "\e[35m"
  ANSI[:CYAN]      = "\e[36m"
  ANSI[:WHITE]     = "\e[37m"

def extend_console(name, care = true, required = true)
  if care
    require name if required
    yield if block_given?
    $console_extensions << "#{ANSI[:GREEN]}#{name}#{ANSI[:RESET]}"
  else
    $console_extensions << "#{ANSI[:GRAY]}#{name}#{ANSI[:RESET]}"
  end
rescue LoadError
  $console_extensions << "#{ANSI[:RED]}#{name}#{ANSI[:RESET]}"
end
$console_extensions = []

extend_console 'pp'
extend_console 'utility_belt'


if ENV['RAILS_ENV']
 load File.dirname(__FILE__) + '/.railsrc'
else
 IRB.conf[:PROMPT_MODE] = :SIMPLE
end

puts "#{ANSI[:LGRAY]}~> Console extensions:#{ANSI[:RESET]} #{$console_extensions.join(' ')}#{ANSI[:RESET]}"

.railsrc

# Set up the prompt to be slightly more informative
rails_env = case ENV['RAILS_ENV'].downcase
  when 'test' then 'test'
  when /local_(.*)/ then 'local_' + $1[0,3]
  else ENV['RAILS_ENV'].downcase[0,3]
end
current_app = Dir.pwd.split('/').last
IRB.conf[:PROMPT][:RAILS] ||= {
  :PROMPT_I => "#{ANSI[:GREEN]}#{current_app} #{rails_env} >> #{ANSI[:RESET]}",
  :PROMPT_N => "#{ANSI[:GREEN]}#{current_app} #{rails_env} >> #{ANSI[:RESET]}",
  :PROMPT_S => nil,
  :PROMPT_C => "#{ANSI[:YELLOW]}?> #{ANSI[:RESET]}",
  :RETURN => "=> %s\n",
  :AUTO_INDENT => true }
IRB.conf[:PROMPT_MODE] = :RAILS

extend_console 'ruby-prof' do
  def measure
    RubyProf.start
    yield
    mem = '%.2f MB' % (RubyProf.measure_memory / (1024.0 * 1024.0))
    RubyProf.stop
    mem
  end
end

def load_account(account_id)
  @account = Account.find(account_id)
  @account.set_shard_connection
  Thread.current[:metric_account_id] = @account.id
  return @account
end

# By default, log to the console, override by passing LOG= something other than 'console' at the command line
ENV['LOG'] ||= 'console' if !Object.const_defined?('RAILS_DEFAULT_LOGGER')

# When you're using Rails 2 console, show queries in the console
extend_console 'rails2', ENV['LOG'] == 'console', false do
  require 'logger'
  RAILS_DEFAULT_LOGGER = Logger.new(STDOUT)
end

# When you're using Rails 3 console, show queries in the console
extend_console 'rails3', ENV['LOG'] == 'console' && defined?(ActiveSupport::Notifications), false do
  $odd_or_even_queries = false
  ActiveSupport::Notifications.subscribe('sql.active_record') do |*args|
    $odd_or_even_queries = !$odd_or_even_queries
    color = $odd_or_even_queries ? ANSI[:CYAN] : ANSI[:MAGENTA]
    event = ActiveSupport::Notifications::Event.new(*args)
    time  = "%.1fms" % event.duration
    name  = event.payload[:name]
    sql   = event.payload[:sql].gsub("\n", " ").squeeze(" ")
    puts "  #{ANSI[:UNDERLINE]}#{color}#{name} (#{time})#{ANSI[:RESET]}  #{sql}"
  end
end

class Object
 def app_request(options = {})
   method = options.delete(:method) || :get
   options.reverse_merge! :only_path => true
   ENV['REQUEST_URI'] = app.url_for(options)
   ENV['REQUEST_METHOD'] = method.to_s
   Dispatcher.dispatch
 end
end