jjb

sleep = (ms)->
  date = new Date()
  loop
    break if (new Date())-date > ms

# from https://stackoverflow.com/questions/951021/what-is-the-javascript-version-of-sleep
# as foretold in a million passionate comments by programmers 'round the world,
# using this in business logic in javascript is a bad idea. but it sometimes comes in
# handy when trying to experiment with something in dev (like if you want to simulate
# a timeout)

jjb

Time.find_zone! uses these two methods to look up strings:

• ActiveSupport::TimeZone[time_zone]
• TZInfo::Timezone.get(time_zone)

The lists they reference are these:

• ActiveSupport::TimeZone.all.map(&:tzinfo).map(&:canonical_identifier) (150)
• TZInfo::Timezone.all_identifiers (606)

jjb

require_relative 'config/environment'

class FileDescriptorLogger
  def initialize(app)
    @app = app
  end

  def call(env)
    if 1000==rand(1001)
      unclosed_files = 0

jjb

pg_dump --schema-only --no-privileges --no-owner DBNAME | awk 'RS="";/CREATE TABLE[^;]*;/' > DBNAME.sql

jjb

`gem install redis`
$: << '/app/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib'
require 'redis'

jjb

intro

Goal is to convert

<img src="<%= ENV["IMAGE_URL"] %>/icons/app-ui-logo-white.png" id="topbar-logo" alt="Freedom logo">

to

jjb

sudo port selfupdate
sudo port install ruby32 # will include readline
sudo port select --set ruby ruby32

### >>> OPEN A NEW TERMINAL!!! <<<
### otherwise, the configuration won't point to the correct version of readline, no matter what you do.
### not sure if this is "through" the ruby binary, or something else in the environment
### i just saved you 17 hours of your life, you're welcome

curl -OL https://github.com/thoughtbot/gitsh/releases/download/v0.14/gitsh-0.14.tar.gz

jjb

background

There are many options available for tuning ruby memory management: https://github.com/ruby/ruby/blob/trunk/gc.c#L7420-L7444

The one that gets the most attention is RUBY_GC_HEAP_GROWTH_FACTOR, which is the only one Heroku suggests adjusting: https://devcenter.heroku.com/articles/ruby-memory-use#gc-tuning

I've often wondered what the drawback was for setting RUBY_GC_HEAP_GROWTH_FACTOR quite low for a webapp.

jjb

function alert {
  if (( $? == 0 )) then
    unicornleap > /dev/null &
    say -v trinoids 'successfully done'
  else
    say -v bad 'failed'
  fi
}

jjb

➔ time sudo port install phantomjs
--->  Fetching archive for phantomjs
--->  Attempting to fetch phantomjs-2.0.0_0.darwin_14.x86_64.tbz2 from http://packages.macports.org/phantomjs
--->  Attempting to fetch phantomjs-2.0.0_0.darwin_14.x86_64.tbz2.rmd160 from http://packages.macports.org/phantomjs
--->  Installing phantomjs @2.0.0_0
--->  Activating phantomjs @2.0.0_0
--->  Cleaning phantomjs
--->  Updating database of binaries
--->  Scanning binaries for linking errors
--->  No broken files found.