h4cc

#
# Ubuntu 22.04 (Jammy Jellyfish)
#
# Basic packages i usually install.
#
# Author: Julius Beckmann <github@h4cc.de>
# 
# Upgraded Script from 18.04: https://gist.github.com/h4cc/c54d3944cb555f32ffdf25a5fa1f2602
# Upgraded Script from 17.04: https://gist.github.com/h4cc/09b7fe843bb737c8039ac62d831f244e

h4cc

defmodule MyBinaryParser do

  # Parsing a 2 byte binary to float16
  # according to: https://en.wikipedia.org/wiki/Half-precision_floating-point_format
  # Float16 is build in OTP 24.
  def parse_float16(<<sign::1, exponent::5, significand::10>>) do

    case {sign, exponent, significand} do

      {0b0, 0b00000, 0b0000000000} ->

h4cc

defmodule MyEcto do

    # Helper to paginate a query
    def paginate_query(%Ecto.Query{} = query, per_page, current_page, callback) when per_page > 0 and current_page >= 0 and is_function(callback) do
      import Ecto.Query
      offset = per_page * current_page
      query
      |> limit(^per_page)
      |> offset(^offset)
      |> LongRepo.all()

h4cc

defmodule Helper do

  # Helper function for setting values deep in a map.
  # Thanks @michalmuskala!
  # https://elixirforum.com/t/put-update-deep-inside-nested-maps-and-auto-create-intermediate-keys/7993/8
  
  @doc """
    Will set value at for keys deep inside data.
    
    iex> Helper.put_in_deep(%{a: %{}}, [:a, :b, :c], 42)

h4cc

#
# Ubuntu 18.04 (Bionic Beaver)
#
# Basic packages i usually install.
#
# Author: Julius Beckmann <github@h4cc.de>
#
# Upgraded Script from 17.04: https://gist.github.com/h4cc/09b7fe843bb737c8039ac62d831f244e
# Upgraded Script from 16.04: https://gist.github.com/h4cc/fe48ed9d85bfff3008704919062f5c9b

h4cc

defmodule InlineLookup do

  # Examples how to handle a static lookup table in Elixir.

  def example1(x) do
    %{1 => "a", 2 => "b", 3 => "c"}[x]
    # Could also be a attribute
    
    # Should be the same as:
    Map.get(%{1 => "a", 2 => "b", 3 => "c"}, x, nil)

h4cc

AmbiPI:/ # cat /storage/hyperion-black-screen.sh
#!/bin/bash
if [ `service hyperion status | grep running | wc -l` = 1 ]
then
    hyperion-remote -c black
    sleep 3
    sudo service hyperion stop
else
    sudo service hyperion start
fi

h4cc

# Updating a Ubuntu 14.04 LTS to 16.04 LTS
# by Julius Beckmann

# Prepare and Fix Locales.
apt-get update; apt-get install -y dialog language-pack-en-base language-pack-de-base; update-locale LANG=de_DE.UTF-8; dpkg-reconfigure locales; apt-get upgrade -y ; apt-get install -y update-manager-core


# Perform Dist Upgrade if presets ok
cat /etc/update-manager/release-upgrades | grep Prompt=lts && do-release-upgrade --check-dist-upgrade-only && do-release-upgrade -m server
# Answer questions, mostly with yes "y"

h4cc

# This is our struct with some fields.
defmodule User do
  defstruct name: "julius", role: :user
end


defmodule UserManager do

  # Matching on %User{} will ensure we will get a user.

h4cc

# Source: https://askubuntu.com/questions/912498/tl-wn722n-is-not-recognized

sudo apt-get install git dkms git make build-essential
cd /usr/src
sudo git clone https://github.com/lwfinger/rtl8188eu.git
sudo dkms add ./rtl8188eu
sudo dkms build 8188eu/1.0
sudo dkms install 8188eu/1.0
sudo modprobe 8188eu