add Odin lang

odin/.gitignore

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+*.o
+*.bin
+*.exe

odin/README.md

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+# Gilded Rose starting position in Odin
+
+Learn how to install Odin on your system [here](https://odin-lang.org/docs/install/)
+
+## Run unit tests from the command line
+```
+$ odin test tests
+```
+## Run the TextTest fixture on the command line
+Build and install the executable
+
+```
+$ odin build gilded_rose
+```
+
+Execute it on the command line with an argument for the number of days:
+
+### macOS:
+
+```
+$ ./gilded_rose.bin 10
+```
+### Windows:
+
+```
+$ ./gilded_rose.exe 10
+```
+
+## Run the TextTest approval test that comes with this project
+There are instructions in the TextTest Readme for setting up TextTest. You will need to specify the executable in `config.gr`. Uncomment this line to use it:
+
+```
+#executable:${TEXTTEST_HOME}/odin/gilded_rose(include your OS executable extension here)
+```

odin/gilded_rose/main.odin

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+package gilded_rose
+
+import "core:fmt"
+import "core:os"
+import "core:strconv"
+
+Item :: struct {
+	name:    string,
+	sell_in: i32,
+	quality: i32,
+}
+
+update_quality :: proc(inventory: []Item) {
+	for &item in inventory {
+		if item.name != "Aged Brie" && item.name != "Backstage passes to a TAFKAL80ETC concert" {
+			if item.quality > 0 {
+				if item.name != "Sulfuras, Hand of Ragnaros" {
+					item.quality = item.quality - 1
+				}
+			}
+		} else {
+			if item.quality < 50 {
+				item.quality = item.quality + 1
+				if item.name == "Backstage passes to a TAFKAL80ETC concert" {
+					if item.sell_in < 11 {
+						if item.quality < 50 {
+							item.quality = item.quality + 1
+						}
+					}
+					if item.sell_in < 6 {
+						if item.quality < 50 {
+							item.quality = item.quality + 1
+						}
+					}
+				}
+			}
+		}
+		if item.name != "Sulfuras, Hand of Ragnaros" {
+			item.sell_in = item.sell_in - 1
+		}
+		if item.sell_in < 0 {
+			if item.name != "Aged Brie" {
+				if item.name != "Backstage passes to a TAFKAL80ETC concert" {
+					if item.quality > 0 {
+						if item.name != "Sulfuras, Hand of Ragnaros" {
+							item.quality = item.quality - 1
+						}
+					}
+				} else {
+					item.quality = item.quality - item.quality
+				}
+			} else {
+				if item.quality < 50 {
+					item.quality = item.quality + 1
+				}
+			}
+		}
+	}
+}
+
+main :: proc() {
+	days := 2
+	if len(os.args) >= 2 {
+		if val, ok := strconv.parse_int(os.args[1]); ok && val > 0 {
+			days = val
+		} else {
+			fmt.eprintf("Please enter a number greater than 0\n")
+			return
+		}
+	}
+
+	items := []Item {
+		{"+5 Dexterity Vest", 10, 20},
+		{"Aged Brie", 2, 0},
+		{"Elixir of the Mongoose", 5, 7},
+		{"Sulfuras, Hand of Ragnaros", 0, 80},
+		{"Sulfuras, Hand of Ragnaros", -1, 80},
+		{"Backstage passes to a TAFKAL80ETC concert", 15, 20},
+		{"Backstage passes to a TAFKAL80ETC concert", 10, 49},
+		{"Backstage passes to a TAFKAL80ETC concert", 5, 49},
+		// This Conjured item does not work properly yet
+		{"Conjured Mana Cake", 3, 6},
+	}
+
+	fmt.println("OMGHAI!")
+
+	for day in 0 ..= days {
+		day_line := fmt.tprint("-------- day", day, "--------")
+		fmt.println(day_line)
+		fmt.println("name, sellIn, quality")
+		for item in items {
+			item_line := fmt.tprint(item.name, item.sell_in, item.quality, sep = ", ")
+			fmt.println(item_line)
+		}
+		fmt.println()
+		update_quality(items)
+	}
+}

odin/tests/gilded_rose_test.odin

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+package test_gilded_rose
+
+import GildedRose "../gilded_rose"
+import "core:testing"
+
+@(test)
+update_quality_test :: proc(t: ^testing.T) {
+	items := []GildedRose.Item{{"food", 0, 0}}
+	GildedRose.update_quality(items)
+	testing.expect(t, "fixme" == items[0].name, "Fix this test")
+}