Add project files.

BetterChests.cs

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+using Microsoft.Xna.Framework;
+using System.Collections.Generic;
+using Terraria;
+using Terraria.ModLoader;
+using Terraria.UI;
+
+namespace BetterChests
+{
+	public class BetterChests : Mod
+	{
+        internal UserInterface UserInterface;
+
+        public override void Load()
+        {
+            if (!Main.dedServ)
+            {
+                UserInterface = new UserInterface();
+                UserInterface.SetState(new BetterChestsUI());
+            }
+
+            ILEdits.Load();
+        }
+
+        private GameTime _lastUpdateUiGameTime;
+        public override void UpdateUI(GameTime gameTime)
+        {
+            _lastUpdateUiGameTime = gameTime;
+            if (Main.LocalPlayer.chest != -1 && BetterChestsUI.visible)
+            {
+                UserInterface.Update(gameTime);
+            }
+        }
+        public override void ModifyInterfaceLayers(List<GameInterfaceLayer> layers)
+        {
+            int mouseTextIndex = layers.FindIndex(layer => layer.Name.Equals("Vanilla: Mouse Text"));
+            if (mouseTextIndex != -1)
+            {
+                layers.Insert(mouseTextIndex, new LegacyGameInterfaceLayer(
+                    "BetterChests: UI",
+                    delegate
+                    {
+                        if (Main.LocalPlayer.chest != -1 && BetterChestsUI.visible)
+                        {
+                            UserInterface.Draw(Main.spriteBatch, _lastUpdateUiGameTime);
+                        }
+                        return true;
+                    }, InterfaceScaleType.UI));
+            }
+        }
+    }
+}

BetterChests.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project Sdk="Microsoft.NET.Sdk">
+  <Import Project="..\..\references\tModLoader.targets" />
+  <PropertyGroup>
+    <AssemblyName>BetterChests</AssemblyName>
+    <TargetFramework>net45</TargetFramework>
+    <PlatformTarget>x86</PlatformTarget>
+    <LangVersion>7.3</LangVersion>
+  </PropertyGroup>
+  <Target Name="BuildMod" AfterTargets="Build">
+    <Exec Command="&quot;$(tMLBuildServerPath)&quot; -build $(ProjectDir) -eac $(TargetPath) -define &quot;$(DefineConstants)&quot; -unsafe $(AllowUnsafeBlocks)" />
+  </Target>
+  <ItemGroup>
+    <PackageReference Include="tModLoader.CodeAssist" Version="0.1.*" />
+  </ItemGroup>
+</Project>

BetterChests.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.31112.23
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "BetterChests", "BetterChests.csproj", "{4AE73323-57DD-4F6E-BA82-91458D43C821}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{4AE73323-57DD-4F6E-BA82-91458D43C821}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{4AE73323-57DD-4F6E-BA82-91458D43C821}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{4AE73323-57DD-4F6E-BA82-91458D43C821}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{4AE73323-57DD-4F6E-BA82-91458D43C821}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {4EC07AD4-6ABE-46BC-927C-8BA28E80A370}
+	EndGlobalSection
+EndGlobal

BetterChestsUI.cs

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+using Terraria.GameContent.UI.Elements;
+using Terraria.UI;
+using Terraria;
+using System.Linq;
+using Terraria.ID;
+using System;
+using Microsoft.Xna.Framework;
+using Terraria.ModLoader;
+using Terraria.UI.Chat;
+
+namespace BetterChests
+{
+    class BetterChestsUI : UIState
+    {
+        public static bool visible = false;
+        private bool _reversed = false;
+        private UIList list;
+
+        public override void OnInitialize()
+        {
+            var header = new UIText("Sorting Options");
+            header.Top.Set(0, 0.255f);
+            header.Left.Set(0, 0.32f);
+            Append(header);
+
+            list = new UIList();
+            list.Top.Set(0, 0.28f);
+            list.Left.Set(0, 0.32f);
+            list.Width.Set(300, 0);
+            list.Height.Set(400, 0);
+            list.ListPadding = 14;
+            Append(list);
+
+            AddSortOption("Default Sort", (evt, elm) => ItemSorting.SortChest());
+            AddSortOption("Sort by ID", (evt, elm) => Sort(x => x.netID, _reversed));
+            AddSortOption("Sort by name", (evt, elm) => Sort(x => x.Name, _reversed));
+            AddSortOption("Sort by rarity", (evt, elm) => Sort(x => x.rare, !_reversed));
+            AddSortOption("Sort by stack size", (evt, elm) => Sort(x => x.stack, !_reversed));
+            AddSortOption("Sort by value", (evt, elm) => Sort(x => x.value, !_reversed));
+            AddSortOption("Sort by Damage", (evt, elm) => Sort(x => x.damage, !_reversed));
+            AddSortOption("Sort by Defense", (evt, elm) => Sort(x => x.defense, !_reversed));
+
+        }
+
+        private void AddSortOption(string title, MouseEvent onclick)
+        {
+            var option = new UITextOption(title);
+            option.OnClick += onclick;
+            list.Add(option);
+        }
+
+        private void Sort<T>(Func<Item, T> func, bool reversed)
+        {
+            // all items in the chest
+            ref var items = ref Main.chest[Main.LocalPlayer.chest].item;
+
+            // order the items according to the function.
+            var sortedItems = items.OrderBy(func).ToArray();
+
+            if (reversed)
+            {
+                // reverse the order
+                sortedItems = sortedItems.Reverse().ToArray();
+            }
+
+            // Air always goes last
+            sortedItems = sortedItems.OrderBy(x => x.IsAir).ToArray();
+
+            // Change color of changed slots
+            for (int i = 0; i < items.Length; i++)
+            {
+                if (!items[i].IsAir && items[i] != sortedItems[i])
+                {
+                    ItemSlot.SetGlow(i, Main.rand.NextFloat(), true);
+                }
+            }
+
+            // Apply changes
+            items = sortedItems;
+
+            // sync chest contents with all clients
+            if (Main.netMode == NetmodeID.MultiplayerClient)
+            {
+                for (int i = 0; i < items.Length; i++)
+                {
+                    NetMessage.SendData(MessageID.SyncChestItem, number: Main.LocalPlayer.chest, number2: i);
+                }
+            }
+        }
+
+        public override void Update(GameTime gameTime)
+        {
+            base.Update(gameTime);
+
+            if (ContainsPoint(Main.MouseScreen))
+            {
+                Main.LocalPlayer.mouseInterface = true;
+            }
+        }
+    }
+}

ILEdits.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Terraria;
+using System.Reflection;
+using MonoMod.Cil;
+using Mono.Cecil.Cil;
+using Terraria.UI;
+using System.Diagnostics;
+
+namespace BetterChests
+{
+    public class ILEdits
+    {
+        public static void Load()
+        {
+            IL.Terraria.UI.ChestUI.DrawButton += EditButton;
+        }
+
+        private static void EditButton(ILContext il)
+        {
+            var c = new ILCursor(il);
+
+            // The goal of this IL edit is to replace SortChest() with code to open my UI
+            // IL_0385: br.s      IL_038C
+            // IL_0387: call      void Terraria.UI.ItemSorting::SortChest()
+            //      <=== here
+
+            if (!c.TryGotoNext(MoveType.After, i => i.MatchCall<ItemSorting>("SortChest")))
+                return;
+
+            c.Prev.Operand = typeof(ILEdits).GetMethod("OpenUI", BindingFlags.NonPublic | BindingFlags.Static);
+        }
+
+        private static void OpenUI()
+        {
+            BetterChestsUI.visible = !BetterChestsUI.visible;
+        }
+    }
+}

Properties/launchSettings.json

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+{
+  "profiles": {
+    "Terraria": {
+      "commandName": "Executable",
+      "executablePath": "$(tMLPath)",
+      "workingDirectory": "$(TerrariaSteamPath)"
+    },
+    "TerrariaServer": {
+      "commandName": "Executable",
+      "executablePath": "$(tMLServerPath)",
+      "workingDirectory": "$(TerrariaSteamPath)"
+    }
+  }
+}

UITextOption.cs

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+using Microsoft.Xna.Framework.Graphics;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Terraria;
+using Terraria.GameContent.UI.Elements;
+using Terraria.ID;
+using Terraria.UI;
+
+namespace BetterChests
+{
+    public class UITextOption : UIText
+    {
+        public float TextScale { get; set; }
+        public bool isLarge;
+        private float _firstTextScale;
+
+        public UITextOption(string text, float textScale = 0.85f, bool large = false) : base(text, textScale, large)
+        {
+            _firstTextScale = textScale;
+            TextScale = textScale;
+            isLarge = large;
+        }
+
+        public override void MouseOver(UIMouseEvent evt)
+        {
+            base.MouseOver(evt);
+            Main.PlaySound(SoundID.MenuTick);
+        }
+
+        public override void Draw(SpriteBatch spriteBatch)
+        {
+            base.Draw(spriteBatch);
+
+            if (IsMouseHovering) 
+            {
+                if (TextScale <= 1)
+                {
+                    TextScale += 0.05f;
+                }
+            }
+            else
+            {
+                if (TextScale >= _firstTextScale)
+                {
+                    TextScale -= 0.05f;
+                }
+            }
+
+            SetText(Text, TextScale, isLarge);
+        }
+    }
+}

build.txt

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+displayName = Better Chests
+author = NotLe0n
+version = 0.1
+hideCode = false
+hideResources = false
+includeSource = false
+buildIgnore = vs/*, *.csproj, *.sln, *.pidb, *.userprefs, *.user, obj/*, bin/*
+homepage = https://forums.terraria.org/index.php?threads/better-chests.104841/

description.txt

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+[c/FFE900:This mod adds more options to sort your chests]
+
+For a Changlog and more information visit my homepage!
+
+Contact [c/66EEFF:NotLe0n#7696] on discord if you have any problems.
+_________________________
+
+[c/FFE900: How to use]
+_________________________
+
+[c/C4C4C4: Simply open a chest and click on "Sort Items".]
+[c/C4C4C4: This will open another menu to the right.]