gvaughn

Step 0:

Get Homebrew installed on your mac if you don't already have it

Step 1:

Install highlight. "brew install highlight". (This brings down Lua and Boost as well)

Step 2:

gvaughn

Greg Vaughn posted this cool alias the other day:

copr = "!f() { git fetch -fu origin refs/pull/$1/head:pr-$1; git checkout pr-$1; } ; f"

Preferring to be a stock-tools person, I wanted to deconstruct this to see how I'd use it off-the-shelf without the alias.

git fetch     -- I'm already familiar with this command
-fu           -- these two flags I'm not sure are necessary, esp. -u since the help says, 
 "unless you are implementing your own Porcelain you are not supposed to use 

gvaughn

gvaughn

# This module represents a behaviour and when used picks from the Application configuration which implementation will be used

defmodule Clock do
  @callback now() :: Integer.t

  defmacro __using__([]) do
    module = Application.get_env(:my_app, :Clock)
    quote do
      alias unquote(module), as: Clock
    end

gvaughn

# A convenient script for Elixir golfing.
# Provide your code and some test cases. Then run this file, e.g. "elixir golf.exs".
# Outputs your character length and test results.
# Text input, text output and return values are all handled.
#
# By Henrik Nyh (http://henrik.nyh.se) under the MIT license.

ExUnit.start

defmodule Golf.Example do

gvaughn

#!bash -e

TOKEN= # slack token is generate from: https://api.slack.com/web
CHANNEL= # name of channels or group
MESSAGE= # message
NICK= # bot name
IS_PRIVATE= # 1 or 0

if [ $IS_PRIVATE -eq 1 ]; then
    API_TYPE=groups

gvaughn

defmodule YourAppName.Search do

  # ...

  @doc """
  Queries listings.
  """
  def query_listings(query, current_user) do
    default_scope = from l in Listing, where: l.draft == false or l.user_id == ^current_user.id, order_by: [desc: l.updated_at], limit: 50
    id = _try_integer(query)

gvaughn

When does terminate/2 get called in a gen_server?

This is what the [official documentation][1] says about the terminate/2 callback for a gen_server:

This function is called by a gen_server when it is about to terminate. It should be the opposite of Module:init/1 and do any necessary cleaning up. When it returns, the gen_server terminates with Reason. The return value is ignored.

Reason is a term denoting the stop reason and State is the internal state of the gen_server.

Reason depends on why the gen_server is terminating. If it is because another callback function has returned a stop tuple {stop,..}, Reason will have the value specified in that tuple. If it is due to a failure, Reason is the error reason.

gvaughn

defmodule MasterProxy.Application do

  alias MyApp.Endpoint,        as: MyAppEndpoint
  alias MyApp.UserSocket,      as: MyAppUserSocket
  alias MyOtherApp.Endpoint,   as: MyOtherAppEndpoint
  alias MyOtherApp.UserSocket, as: MyOtherAppUserSocket

  alias Phoenix.LiveReloader.Socket,  as: LiveReloadSocket
  alias Plug.Cowboy

gvaughn

defmodule MyApp.Migration do
  @moduledoc """
  Additional helpers for PostgreSQL.
  """

  import Ecto.Migration, only: [execute: 2]

  defmacro __using__(_) do
    quote do
      use Ecto.Migration