Dynamic Hostname System (#1296)

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# Description

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Change your hostname whenever map, preset, or runlevel changes!

Variables given on all hostname locale strings:
- {$mapName} - The name of the current map.
- {$preset} - The name of the current preset.
- {$originalHostname} - What you originally had game.hostname set to,
before updating.

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<details><summary><h1>Media</h1></summary>
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![image](https://github.com/user-attachments/assets/97cba40b-5ceb-40f8-91e4-93450cd22b78)

![image](https://github.com/user-attachments/assets/2cf27e65-b493-4916-bedd-aa69eaa0135b)

![image](https://github.com/user-attachments/assets/234f5be0-7a8c-41e1-abdf-10e9c6700a90)

![image](https://github.com/user-attachments/assets/522525d6-fb23-45b9-b559-deffb3f37a58)



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# Changelog

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nah

Content.Server/DynamicHostname/DynamicHostnameSystem.cs

@@ -0,0 +1,86 @@
+using Content.Server.GameTicking;
+using Content.Server.Maps;
+using Content.Shared.CCVar;
+using Content.Shared.GameTicking;
+using Robust.Shared;
+using Robust.Shared.Configuration;
+
+namespace Content.Server.DynamicHostname;
+
+
+/// <summary>
+/// This handles dynamically updating hostnames.
+/// </summary>
+public sealed class DynamicHostnameSystem : EntitySystem
+{
+    [Dependency] private readonly IConfigurationManager _configuration = default!;
+    [Dependency] private readonly GameTicker _gameTicker = default!;
+    [Dependency] private readonly IGameMapManager _mapManager = default!;
+
+    private string OriginalHostname { get; set; } = string.Empty;
+
+    /// <inheritdoc/>
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<GameRunLevelChangedEvent>(OnRunLevelChanged);
+        SubscribeLocalEvent<RoundStartedEvent>(OnRoundStarted);
+
+        Subs.CVar(_configuration, CCVars.UseDynamicHostname, OnValueChanged);
+
+        OriginalHostname = _configuration.GetCVar(CVars.GameHostName);
+        AttemptUpdateHostname();
+    }
+
+    private void OnRunLevelChanged(GameRunLevelChangedEvent ev) => AttemptUpdateHostname();
+    private void OnRoundStarted(RoundStartedEvent ev) => AttemptUpdateHostname();
+
+    private void OnValueChanged(bool newValue)
+    {
+        if (!newValue)
+            _configuration.SetCVar(CVars.GameHostName, OriginalHostname);
+
+        AttemptUpdateHostname();
+    }
+
+    private void AttemptUpdateHostname()
+    {
+        if (!_configuration.GetCVar(CCVars.UseDynamicHostname))
+            return;
+
+        var currentMapName = _mapManager.GetSelectedMap()?.MapName;
+        var currentPresetName = _gameTicker.CurrentPreset?.ModeTitle;
+
+        UpdateHostname(currentMapName, currentPresetName);
+    }
+
+    private string GetLocId()
+    {
+        switch (_gameTicker.RunLevel)
+        {
+            case GameRunLevel.InRound:
+                return "in-round";
+            case GameRunLevel.PostRound:
+                return "post-round";
+            default:
+                return "in-lobby";
+        }
+    }
+
+    private void UpdateHostname(string? currentMapName = null, string? currentPresetName = null)
+    {
+        var locId = GetLocId();
+        var presetName = "No preset";
+
+        if (currentPresetName != null)
+            presetName = Loc.GetString(currentPresetName);
+
+        var hostname = Loc.GetString($"dynamic-hostname-{locId}-hostname",
+            ("originalHostName", OriginalHostname),
+            ("preset", presetName),
+            ("mapName", currentMapName ?? "No map"));
+
+        _configuration.SetCVar(CVars.GameHostName, hostname);
+    }
+}

Content.Shared/CCVar/CCVars.cs

@@ -2790,5 +2790,13 @@ public static readonly CVarDef<float>
         /// Requires auto voting to be enabled.
         public static readonly CVarDef<bool> PresetAutoVoteEnabled =
             CVarDef.Create("vote.preset_autovote_enabled", true, CVar.SERVERONLY);
+
+        /// <summary>
+        /// Set to true to enable the dynamic hostname system.
+        /// Automatically updates the hostname to include current map and preset.
+        /// Configure what that looks like for you in Resources/Prototypes/Locale/en-US/dynamichostname/hostname.ftl
+        /// </summary>
+        public static readonly CVarDef<bool> UseDynamicHostname =
+            CVarDef.Create("game.use_dynamic_hostname", false, CVar.SERVERONLY);
     }
 }

Resources/Locale/en-US/dynamichostname/hostname.ftl

@@ -0,0 +1,3 @@
+dynamic-hostname-in-lobby-hostname = { $originalHostName } | Sitting in lobby
+dynamic-hostname-in-round-hostname = { $originalHostName } | Playing { $preset } on { $mapName }
+dynamic-hostname-post-round-hostname = { $originalHostName } | Round over