Format bytes to B, KB, MB, GB

format.ex

defmodule PhoenixObserver.Format do
  def number_to_human_size(size) when is_integer(size) and size < 1024, do: "#{size} B"
  def number_to_human_size(size) when size < 1024 * 1024, do: "#{Float.round(size / 1024, 4)} KB"

  def number_to_human_size(size) when size < 1024 * 1024 * 1024,
    do: "#{Float.round(size / (1024 * 1024), 4)} MB"

  def number_to_human_size(size) when size < 1024 * 1024 * 1024 * 1024 do
    "#{Float.round(size / (1024 * 1024 * 1024), 4)} GB"
  end

  def number_to_human_size(size), do: "#{size} ??"

  def to_percentage(num) when num < 0.1, do: "#{Float.round(num * 100, 2)}%"
  def to_percentage(num) when num < 1, do: "#{Float.round(num * 100, 2)}%"
  def to_percentage(_), do: "100%"
end