Add command history

FiveMRcon/CmdHistoryNode.cs

@@ -0,0 +1,14 @@
+namespace FiveMRcon
+{
+	public class CmdHistoryNode
+	{
+		public string Command;
+		public CmdHistoryNode PreviousCmdNode { get; }
+		public CmdHistoryNode NextCmdNode;
+
+		public CmdHistoryNode(CmdHistoryNode prevNode)
+		{
+			PreviousCmdNode = prevNode;
+		}
+	}
+}

FiveMRcon/FiveMRcon.csproj

@@ -46,6 +46,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="CmdHistoryNode.cs" />
     <Compile Include="InfoHolder.cs" />
     <Compile Include="RconForm.cs">
       <SubType>Form</SubType>

FiveMRcon/RconForm.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Media;
 using System.Net;
 using System.Net.Sockets;
 using System.Text;
@@ -8,8 +9,12 @@ namespace FiveMRcon
 {
 	public partial class RconForm : Form
 	{
+		private CmdHistoryNode _CurrentCmdHistoryNode;
+
 		public RconForm()
 		{
+			_CurrentCmdHistoryNode = new CmdHistoryNode(null);
+
 			InitializeComponent();
 			ActiveControl = InputText;
 		}
@@ -25,6 +30,37 @@ private void InputText_TextChanged(object sender, EventArgs e)
 			InputSend.Enabled = InputText.Text.Trim().Length > 0;
 		}
 
+		private void InputText_KeyUp(object sender, KeyEventArgs e)
+		{
+			bool relevantKeyUp = false;
+			if (e.KeyCode == Keys.Up)
+			{
+				if (_CurrentCmdHistoryNode.PreviousCmdNode != null)
+				{
+					_CurrentCmdHistoryNode = _CurrentCmdHistoryNode.PreviousCmdNode;
+					relevantKeyUp = true;
+				}
+				else
+					SystemSounds.Beep.Play();
+			}
+			else if (e.KeyCode == Keys.Down)
+			{
+				if (_CurrentCmdHistoryNode.NextCmdNode != null)
+				{
+					_CurrentCmdHistoryNode = _CurrentCmdHistoryNode.NextCmdNode;
+					relevantKeyUp = true;
+				}
+				else
+					SystemSounds.Beep.Play();
+			}
+
+			if (relevantKeyUp)
+			{
+				InputText.Text = _CurrentCmdHistoryNode.Command;
+				InputText.SelectionStart = InputText.TextLength;
+			}
+		}
+
 		private void InputSend_Click(object sender, EventArgs e)
 		{
 			InputSend.Enabled = false;
@@ -69,6 +105,13 @@ private void InputSend_Click(object sender, EventArgs e)
 				}
 			}
 
+			CmdHistoryNode newCmdHistoryNode = new CmdHistoryNode(_CurrentCmdHistoryNode);
+			// Set command and next node of current node
+			_CurrentCmdHistoryNode.Command = InputText.Text;
+			_CurrentCmdHistoryNode.NextCmdNode = newCmdHistoryNode;
+			// Set current node to new one
+			_CurrentCmdHistoryNode = newCmdHistoryNode;
+
 			InputText.ResetText();
 			ActiveControl = InputText;
 		}