Merge pull request #15 from Maikon/elixir-version

Add Elixir version

elixir/config/config.exs

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+use Mix.Config

elixir/lib/gilded_rose.ex

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+defmodule GildedRose do
+  # Example
+  # update_quality([%Item{name: "Backstage passes to a TAFKAL80ETC concert", sell_in: 9, quality: 1}])
+  # => [%Item{name: "Backstage passes to a TAFKAL80ETC concert", sell_in: 9, quality: 3}]
+
+  def update_quality(items) do
+    Enum.map(items, &update_item/1)
+  end
+
+  def update_item(item) do
+    cond do
+      item.quality == 0 ->
+        item
+      item.sell_in < 0 && item.name == "Backstage passes to a TAFKAL80ETC concert" ->
+        %{item | quality: 0}
+      item.name == "Aged Brie" || item.name == "Backstage passes to a TAFKAL80ETC concert" ->
+        if item.name == "Backstage passes to a TAFKAL80ETC concert" && item.sell_in > 5 && item.sell_in <= 10 do
+          %{item | quality: item.quality + 2}
+        else
+          if item.name == "Backstage passes to a TAFKAL80ETC concert" && item.sell_in >= 0 && item.sell_in <= 5 do
+            %{item | quality: item.quality + 3}
+          else
+            if item.quality < 50 do
+              %{item | quality: item.quality + 1}
+            else
+              item
+            end
+          end
+        end
+      item.sell_in < 0 ->
+        if item.name == "Backstage passes to a TAFKAL80ETC concert" do
+          %{item | quality: 0}
+        else
+          if item.name == "+5 Dexterity Vest" || item.name == "Elixir of the Mongoose" do
+            %{item | quality: item.quality - 2}
+          else
+            item
+          end
+        end
+      item.name == "+5 Dexterity Vest" || item.name == "Elixir of the Mongoose" ->
+        %{item | quality: item.quality - 1}
+      item.name != "Sulfuras, Hand of Ragnaros" ->
+        %{item | quality: item.quality - 1}
+      true ->
+        item
+    end
+  end
+end

elixir/lib/item.ex

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+defmodule Item do
+  defstruct name: nil, sell_in: nil, quality: nil
+end

elixir/mix.exs

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+defmodule GildedRose.Mixfile do
+  use Mix.Project
+
+  def project do
+    [app: :gilded_rose,
+     version: "0.0.1",
+     elixir: "~> 1.0"]
+  end
+end

elixir/test/gilded_rose_test.exs

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+defmodule GildedRoseTest do
+  use ExUnit.Case
+
+  test "begin the journey of refactoring" do
+  end
+end

elixir/test/test_helper.exs

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+ExUnit.start()