add Lua lang

lua/src/gilded_rose.lua

@@ -0,0 +1,63 @@
+local GildedRose = {}
+
+function GildedRose:new(items)
+  return {
+    items = items,
+    updateQuality = self.updateQuality,
+  }
+end
+
+function GildedRose:updateQuality()
+  for i, _ in pairs(self.items) do
+    if self.items[i].name ~= "Aged Brie" and
+        self.items[i].name ~= "Backstage passes to a TAFKAL80ETC concert" then
+      if self.items[i].quality > 0 then
+        if self.items[i].name ~= "Sulfuras, Hand of Ragnaros" then
+          self.items[i].quality = self.items[i].quality - 1
+        end
+      end
+    else
+      if self.items[i].quality < 50 then
+        self.items[i].quality = self.items[i].quality + 1
+
+        if self.items[i].name == "Backstage passes to a TAFKAL80ETC concert" then
+          if self.items[i].sell_in < 11 then
+            if self.items[i].quality < 50 then
+              self.items[i].quality = self.items[i].quality + 1
+            end
+          end
+          if self.items[i].sell_in < 6 then
+            if self.items[i].quality < 50 then
+              self.items[i].quality = self.items[i].quality + 1
+            end
+          end
+        end
+      end
+    end
+
+    if self.items[i].name ~= "Sulfuras, Hand of Ragnaros" then
+      self.items[i].sell_in = self.items[i].sell_in - 1
+    end
+
+    if self.items[i].sell_in < 0 then
+      if self.items[i].name ~= "Aged Brie" then
+        if self.items[i].name ~= "Backstage passes to a TAFKAL80ETC concert" then
+          if self.items[i].quality > 0 then
+            if self.items[i].name ~= "Sulfuras, Hand of Ragnaros" then
+              self.items[i].quality = self.items[i].quality - 1
+            end
+          end
+        else
+          self.items[i].quality = self.items[i].quality - self.items[i].quality
+        end
+      else
+        if self.items[i].quality < 50 then
+          self.items[i].quality = self.items[i].quality + 1
+        end
+      end
+    end
+  end
+  return self.items
+end
+
+return GildedRose

lua/src/item.lua

@@ -0,0 +1,7 @@
+local Item = {}
+
+function Item:new(name, sell_in, quality)
+  return { name = name, sell_in = sell_in, quality = quality }
+end
+
+return Item

lua/src/main.lua

@@ -0,0 +1,30 @@
+local Item = require("src/item")
+local GildedRose = require("src/gilded_rose")
+
+local items = {
+  Item:new("+5 Dexterity Vest", 10, 20),
+  Item:new("Aged Brie", 2, 0),
+  Item:new("Elixir of the Mongoose", 5, 7),
+  Item:new("Sulfuras, Hand of Ragnaros", 0, 80),
+  Item:new("Sulfuras, Hand of Ragnaros", -1, 80),
+  Item:new("Backstage passes to a TAFKAL80ETC concert", 15, 20),
+  Item:new("Backstage passes to a TAFKAL80ETC concert", 10, 49),
+  Item:new("Backstage passes to a TAFKAL80ETC concert", 5, 49),
+
+  -- This Conjured item does not work properly yet
+  Item:new("Conjured Mana Cake", 3, 6),
+};
+
+local days = arg[1] or 2;
+local gilded_rose = GildedRose:new(items);
+
+print("OMGHAI!");
+for day = 0, days do
+  print("-------- day " .. day .. " --------");
+  print("name, sellIn, quality");
+  for _, item in pairs(items) do
+    print(item.name .. ", " .. item.sell_in .. ", " .. item.quality);
+  end
+  gilded_rose:updateQuality();
+  print("")
+end