Autocapitalize the word I in IC chat (#18633)

Content.Server/Chat/Systems/ChatSystem.cs

@@ -1,3 +1,4 @@
+using System.Globalization;
 using System.Linq;
 using System.Text;
 using Content.Server.Administration.Logs;
@@ -199,8 +200,11 @@ public sealed partial class ChatSystem : SharedChatSystem
 
         bool shouldCapitalize = (desiredType != InGameICChatType.Emote);
         bool shouldPunctuate = _configurationManager.GetCVar(CCVars.ChatPunctuation);
+        // Capitalizing the word I only happens in English, so we check language here
+        bool shouldCapitalizeTheWordI = (!CultureInfo.CurrentCulture.IsNeutralCulture && CultureInfo.CurrentCulture.Parent.Name == "en")
+            || (CultureInfo.CurrentCulture.IsNeutralCulture && CultureInfo.CurrentCulture.Name == "en");
 
-        message = SanitizeInGameICMessage(source, message, out var emoteStr, shouldCapitalize, shouldPunctuate);
+        message = SanitizeInGameICMessage(source, message, out var emoteStr, shouldCapitalize, shouldPunctuate, shouldCapitalizeTheWordI);
 
         // Was there an emote in the message? If so, send it.
         if (player != null && emoteStr != message && emoteStr != null)
@@ -677,11 +681,13 @@ public sealed partial class ChatSystem : SharedChatSystem
     }
 
     // ReSharper disable once InconsistentNaming
-    private string SanitizeInGameICMessage(EntityUid source, string message, out string? emoteStr, bool capitalize = true, bool punctuate = false)
+    private string SanitizeInGameICMessage(EntityUid source, string message, out string? emoteStr, bool capitalize = true, bool punctuate = false, bool capitalizeTheWordI = true)
     {
         var newMessage = message.Trim();
         if (capitalize)
             newMessage = SanitizeMessageCapital(newMessage);
+        if (capitalizeTheWordI)
+            newMessage = SanitizeMessageCapitalizeTheWordI(newMessage, "i");
         if (punctuate)
             newMessage = SanitizeMessagePeriod(newMessage);
 

Content.Shared/Chat/SharedChatSystem.cs

@@ -162,4 +162,33 @@ public abstract class SharedChatSystem : EntitySystem
         message = char.ToUpper(message[0]) + message.Remove(0, 1);
         return message;
     }
+
+    public string SanitizeMessageCapitalizeTheWordI(string message, string theWordI = "i")
+    {
+        if (string.IsNullOrEmpty(message))
+            return message;
+
+        for
+        (
+            var index = message.IndexOf(theWordI);
+            index != -1;
+            index = message.IndexOf(theWordI, index + 1)
+        )
+        {
+            // Stops the code If It's tryIng to capItalIze the letter I In the mIddle of words
+            // Repeating the code twice is the simplest option
+            if (index + 1 < message.Length && char.IsLetter(message[index + 1]))
+                continue;
+            if (index - 1 >= 0 && char.IsLetter(message[index - 1]))
+                continue;
+
+            var beforeTarget = message.Substring(0, index);
+            var target = message.Substring(index, theWordI.Length);
+            var afterTarget = message.Substring(index + theWordI.Length);
+
+            message = beforeTarget + target.ToUpper() + afterTarget;
+        }
+
+        return message;
+    }
 }