craigp

# You will need fswatch installed (available in homebrew and friends)
# The command below will run tests and wait until fswatch writes something.
# The --stale flag will only run stale entries, it requires Elixir v1.3.
fswatch lib/ test/ | MIX_ENV=test mix do test --stale, run --no-halt -e "IO.gets(:stdio, ''); IO.puts 'Restarting...'; :init.restart()"

craigp

This runs a build for a small elixir (phoenix) project in about 40 seconds by caching as much of the compiled files as possible.

We've been using this for months in multiple projects without any issues. Please ping be if there is any issues with this script and I'll update it.

It should be generic enough to work on any elixir app using mix.

If you have a elixir_buildpack.config, then enable that section in the build script to keep versions in sync!

2016-08-09: Updated to newer Erlang and Elixir and fixed curl command.

craigp

#!/usr/bin/env elixir

ecto_import = "import Ecto.Query, only: [from: 2]"

mixexs =
  Path.join(["mix.exs"])
  |> File.read!

namespace =
  Regex.run(~r{defmodule\s+(\w+)\.}, mixexs)

craigp

#!/bin/bash

function print_image() {
  printf "\033]"
  printf "1337;File="
  echo -n "$1" | base64 -D | wc -c | awk '{printf "size=%d",$1}'
  printf ";inline=1:"
  echo -n "$1"
  printf "\a\n"
}

craigp

TIL how to make deprecation warnings:

Compiling 2 files (.ex)
warning: `Retort.Resources.timeout/2` is deprecated; call `Retort.Resources.Timeout.get_or_default/2` instead.
  lib/retort/resources.ex:197: Retort.Resources.timeout/2

Replace function

craigp

# Elixir has lazily evaluated enumerable objects that allow you
# to work with enumerable objects like lists either only as needed
# or infinitely.

# Start up iex to play around
$ iex

# Typical enumeration is done eagerly where the result is computed ASAP
iex> Enum.map(1..10, fn i -> i * 2 end)
[2, 4, 6, 8, 10, 12, 14, 16, 18, 20]

craigp

$./bin/my_app rpc Elixir.Application app_dir "[my_app, <<\"/priv/repo/migrations\">>]."
<<"/home/dashboard/uss/lib/my_app-0.0.1/priv/repo/migrations">>


./bin/my_app rpc Elixir.Ecto.Migrator run "['Elixir.MyApp.Repo', <<\"/home/dashboard/uss/lib/my_app-0.0.1/priv/repo/migrations\">>, up, [{all, true}]]."
# => []

craigp

env = case System.get_env("MIX_ENV") || "dev" do
  "prod" -> IO.ANSI.red() <> "prod" <> IO.ANSI.reset()
  "dev" -> IO.ANSI.green() <> "dev" <> IO.ANSI.reset()
  "test" -> IO.ANSI.green() <> "test" <> IO.ANSI.reset()
  mix_env -> IO.ANSI.yellow() <> mix_env <> IO.ANSI.reset()
end

IEx.configure(
  default_prompt: "%prefix(#{env},%counter)>",
  alive_prompt: "%prefix(#{env},%node,%counter)>"

craigp

#!/usr/bin/env bash
#
# Usage:
#     transcode filename [filename...]
#
# File type is determined using:
#
#   file --mime-type filename
#
# Audio files:

craigp

#!/bin/bash

ask() {
  # https://djm.me/ask
  local prompt default reply

  while true; do

    if [ "${2:-}" = "Y" ]; then
      prompt="Y/n"