Adds Helpers

Author: radwo

lib/util/helpers.ex

@@ -0,0 +1,24 @@
+defmodule Util.Helpers do
+  @moduledoc """
+  Miscellaneous helpers
+  """
+
+  def non_empty_value_or_default(map, key, default) do
+    case Map.get(map, key) do
+      val when is_integer(val) and val > 0 -> {:ok, val}
+      val when is_binary(val) and val != "" -> {:ok, val}
+      val when is_list(val) and length(val) > 0 -> {:ok, val}
+      _ -> {:ok, default}
+    end
+  end
+
+  def not_empty_string(map, key, error_atom \\ "") do
+    case Map.get(map, key) do
+      value when is_binary(value) and value != "" ->
+        {:ok, value}
+      error_val ->
+        "'#{key}' - invalid value: '#{error_val}', it must be a not empty string."
+        |> Util.ToTuple.error(error_atom)
+    end
+  end
+end