Christoph Grabo asaaki

Using OTP's observer (appmon replacement) remotely

$ ssh remote-host "epmd -names"
epmd: up and running on port 4369 with data:
name some_node at port 58769

Note the running on port for epmd itself and the port of the node you're interested in debugging. Reconnect to the remote host with these ports forwarded:

$ ssh -L 4369:localhost:4369 -L 58769:localhost:58769 remote-host

CSS Layout Debugger

A tweet-sized debugger for visualizing your CSS layouts. Outlines every DOM element on your page a random (valid) CSS hex color.

One-line version to paste in your DevTools

Use $$ if your browser aliases it:

~ 108 byte version

This list is based on aliases_spec.rb.

You can see also Module: RSpec::Matchers API.

matcher	aliased to	description
a_truthy_value	be_truthy	a truthy value
a_falsey_value	be_falsey	a falsey value
be_falsy	be_falsey	be falsy
a_falsy_value	be_falsey	a falsy value

	# Gulpfile.js
	# // Note the new way of requesting CoffeeScript since 1.7.x
	# require('coffee-script/register');
	# // This bootstraps your Gulp's main file
	# require('./Gulpfile.coffee');


	# assets
	# ├── Gulpfile.coffee
	# ├── Gulpfile.js

	defmodule Returning do

	defmacro returning(val, do_block) do
	quote do
	val = unquote(val)
	case val, unquote(do_block)
	val
	end
	end
	end

	#!/usr/bin/env ruby

	# A sneaky wrapper around Rubocop that allows you to run it only against
	# the recent changes, as opposed to the whole project. It lets you
	# enforce the style guide for new/modified code only, as opposed to
	# having to restyle everything or adding cops incrementally. It relies
	# on git to figure out which files to check.
	#
	# Here are some options you can pass in addition to the ones in rubocop:
	#

	require "pstore"
	require "json"

	class JSON::Store < PStore

	def dump(table)
	# use JSON.pretty_generate(table) to make it even more human readable
	JSON.generate(table)
	end

	# post_loc.txt contains the json you want to post
	# -p means to POST it
	# -H adds an Auth header (could be Basic or Token)
	# -T sets the Content-Type
	# -c is concurrent clients
	# -n is the number of requests to run in the test

	ab -p post_loc.txt -T application/json -H 'Authorization: Token abcd1234' -c 10 -n 2000 http://example.com/api/v1/locations/

	defmodule Curried do
	defmacro defc({name, _, args}, [do: body]) do
	curried_args = Enum.map(Enum.with_index(args), fn({_, index}) ->
	Enum.take(args, index + 1)
	end)
	for a <- curried_args do
	if a == Enum.at(curried_args, Enum.count(curried_args) - 1) do
	quote do
	def unquote(name)(unquote_splicing(a)) do
	unquote(body)

	# How To Guard Against Ruby Nil Errors
	# http://www.littlelines.com/blog/2013/06/22/how-to-guard-against-ruby-nil-errors/

	# Null Object Pattern
	# using OpenStruct for simple predefined null objects

	require "ostruct"
	NullUser = OpenStruct.new(id: -1, name: "Null User") # ... and additional accessors