Whitespace

-- Heroku has a bunch of awesome queries
-- https://github.com/heroku/heroku-pg-extras/tree/master/commands

-- View slow queries for widgets table
SELECT query, total_time/calls AS avg_time
FROM pg_stat_statements
WHERE query LIKE 'SELECT%'
  AND query LIKE '%widgets%'
ORDER BY avg_time DESC;

Whitespace

require "net/http"

def start_server
  # Remove the X to enable the parameters for tuning.
  # These are the default values as of Ruby 2.2.0.
  @child = spawn(<<-EOC.split.join(" "))
    XRUBY_GC_HEAP_FREE_SLOTS=4096
    XRUBY_GC_HEAP_INIT_SLOTS=10000
    XRUBY_GC_HEAP_GROWTH_FACTOR=1.8
    XRUBY_GC_HEAP_GROWTH_MAX_SLOTS=0

Whitespace

Background

Not every app is setup to run capybara tests, but many have an existing testing framework that we'll have to integrate with. Here are some common frameworks we'll come across.

Rspec

If there's no existing testing framework, let's setup this app with rspec, which is preferred.

Whitespace

SELECT userid, dbid, left(query, 100), total_time, rows FROM pg_stat_statements WHERE total_time >= 1000 ORDER BY total_time DESC;

Whitespace

# inspired by http://gogotanaka.github.io/rubype.github.io/
module Types
  def self.included(base)
    class << base
      def typesig method, signature_hash
        arg_types, ret_type = signature_hash.to_a[0]

        self.send(:alias_method, "__#{method}".to_sym, method)

        define_method method do |*args|

Whitespace

• Server naming scheme (named capture groups)
  • v2
• Split on only single dashes for namespacing (negative lookaround)
  • Better version (word boundaries)
• Regex to match regexes

Whitespace

Keybase proof

I hereby claim:

• I am whitespace on github.
• I am whitespace (https://keybase.io/whitespace) on keybase.
• I have a public key whose fingerprint is C9B9 3355 72A5 6AF5 008D 43AE 082C 9F6A F98D 34C9

To claim this, I am signing this object:

Whitespace

require "minitest/autorun"

module Monad
  def return(val)
    self.class.new(val)
  end

  def bind(&block)
    self.return yield @value
  end

Whitespace

function p {
  command=$1
  shift 1
  heroku $command -r production $@
}

function s {
  command=$1
  shift 1
  heroku $command -r staging $@

Whitespace

git checkout master
git fetch
git remote prune origin
git branch --merged master | grep -v 'master$' | xargs git branch -d
echo "The following remote branches are fully merged and will be removed:"
git branch -r --merged master | sed 's/ *origin\///' | grep -v 'master$'


git branch -r --merged master | sed 's/ *origin\///' | grep -v 'master$' | xargs -I% git push origin :%