Added library size to homepage (#264)

lib/pinchflat/utils/number_utils.ex

@@ -13,4 +13,27 @@ defmodule Pinchflat.Utils.NumberUtils do
     |> max(minimum)
     |> min(maximum)
   end
+
+  @doc """
+  Converts a number to a human readable byte size. Can take a precision
+  option to specify the number of decimal places to round to.
+
+  Returns {integer(), String.t()}
+  """
+  def human_byte_size(number, opts \\ [])
+  def human_byte_size(nil, opts), do: human_byte_size(0, opts)
+
+  def human_byte_size(number, opts) do
+    precision = Keyword.get(opts, :precision, 2)
+    suffixes = ["B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"]
+    base = 1024
+
+    Enum.reduce_while(suffixes, {number / 1.0, "B"}, fn suffix, {value, _} ->
+      if value < base do
+        {:halt, {Float.round(value, precision), suffix}}
+      else
+        {:cont, {value / base, suffix}}
+      end
+    end)
+  end
 end