Add D language version

d/.gitignore

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+.dub

d/dub.json

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+{
+    "name": "GildedRose",
+    "configurations": [
+        {
+            "name": "GuildedRose",
+            "targetType": "executable",
+            "mainSourceFile": "src/GildedRoseTextTests.d"
+        },
+        {
+            "name": "unittest",
+            "targetType": "executable",
+            "sourcePaths": ["test"],
+            "mainSourceFile": "test/GildedRoseUnitTests.d"
+        }
+    ]
+}

d/src/GildedRose.d

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+struct Item
+{
+    string name;
+    int sellIn;
+    int quality;
+}
+
+class GildedRose
+{
+public:
+    Item[] items;
+    this(Item[] items)
+    {
+        this.items = items.dup;
+    }
+
+    void updateQuality()
+    {
+        for (int i = 0; i < items.length; i++)
+        {
+            if (items[i].name != "Aged Brie"
+                    && items[i].name != "Backstage passes to a TAFKAL80ETC concert")
+            {
+                if (items[i].quality > 0)
+                {
+                    if (items[i].name != "Sulfuras, Hand of Ragnaros")
+                    {
+                        items[i].quality = items[i].quality - 1;
+                    }
+                }
+            }
+            else
+            {
+                if (items[i].quality < 50)
+                {
+                    items[i].quality = items[i].quality + 1;
+
+                    if (items[i].name == "Backstage passes to a TAFKAL80ETC concert")
+                    {
+                        if (items[i].sellIn < 11)
+                        {
+                            if (items[i].quality < 50)
+                            {
+                                items[i].quality = items[i].quality + 1;
+                            }
+                        }
+
+                        if (items[i].sellIn < 6)
+                        {
+                            if (items[i].quality < 50)
+                            {
+                                items[i].quality = items[i].quality + 1;
+                            }
+                        }
+                    }
+                }
+            }
+
+            if (items[i].name != "Sulfuras, Hand of Ragnaros")
+            {
+                items[i].sellIn = items[i].sellIn - 1;
+            }
+
+            if (items[i].sellIn < 0)
+            {
+                if (items[i].name != "Aged Brie")
+                {
+                    if (items[i].name != "Backstage passes to a TAFKAL80ETC concert")
+                    {
+                        if (items[i].quality > 0)
+                        {
+                            if (items[i].name != "Sulfuras, Hand of Ragnaros")
+                            {
+                                items[i].quality = items[i].quality - 1;
+                            }
+                        }
+                    }
+                    else
+                    {
+                        items[i].quality = items[i].quality - items[i].quality;
+                    }
+                }
+                else
+                {
+                    if (items[i].quality < 50)
+                    {
+                        items[i].quality = items[i].quality + 1;
+                    }
+                }
+            }
+        }
+    }
+}

d/src/GildedRoseTextTests.d

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+import GildedRose;
+
+int main()
+{
+    import std.stdio : writefln, writeln;
+
+    Item[] items = [
+        Item("+5 Dexterity Vest", 10, 20),
+        Item("Aged Brie", 2, 0),
+        Item("Elixir of the Mongoose", 5, 7),
+        Item("Sulfuras, Hand of Ragnaros", 0, 80),
+        Item("Sulfuras, Hand of Ragnaros", -1, 80),
+        Item("Backstage passes to a TAFKAL80ETC concert", 15, 20),
+        Item("Backstage passes to a TAFKAL80ETC concert", 10, 49),
+        Item("Backstage passes to a TAFKAL80ETC concert", 5, 49),
+        // this Conjured item doesn't yet work properly
+        Item("Conjured Mana Cake", 3, 6),
+    ];
+
+    auto app = new GildedRose(items);
+
+    writeln("OMGHAI!");
+
+    for (int day = 0; day <= 30; day++)
+    {
+        writefln!"-------- day %s --------"(day);
+        writeln("Item(name, sellIn, quality)");
+        foreach (item; app.items)
+        {
+            writeln(item);
+        }
+        writeln;
+
+        app.updateQuality;
+    }
+
+    return 0;
+}

d/test/GildedRoseUnitTests.d

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+import GildedRose;
+
+unittest
+{
+    Item[] items = [ Item("Foo", 0, 0)];
+    auto app = new GildedRose(items);
+
+    app.updateQuality;
+
+    assert("fixme" == app.items[0].name);
+}
+
+void example()
+{
+    Item[] items = [
+        Item("+5 Dexterity Vest", 10, 20),
+        Item("Aged Brie", 2, 0),
+        Item("Elixir of the Mongoose", 5, 7),
+        Item("Sulfuras, Hand of Ragnaros", 0, 80),
+        Item("Backstage passes to a TAFKAL80ETC concert", 15, 20),
+        Item("Conjured Mana Cake", 3, 6),
+    ];
+    auto app = new GildedRose(items);
+    app.updateQuality;
+}