feat: add IsPublic property to channels and enhance channel creation with visibility options

src/EchoHub.Server.Irc/IrcMessageFormatter.cs

@@ -1,10 +1,11 @@
 using System.Text;
+using System.Text.RegularExpressions;
 using EchoHub.Core.DTOs;
 using EchoHub.Core.Models;
 
 namespace EchoHub.Server.Irc;
 
-public static class IrcMessageFormatter
+public static partial class IrcMessageFormatter
 {
     private const int MaxIrcLineContentBytes = 400;
 
@@ -33,7 +34,7 @@ public static class IrcMessageFormatter
                 {
                     var trimmed = line.TrimEnd('\r');
                     if (trimmed.Length > 0)
-                        lines.Add($"{prefix} PRIVMSG {ircChannel} :{trimmed}");
+                        lines.Add($"{prefix} PRIVMSG {ircChannel} :{ColorTagsToAnsi(trimmed)}");
                 }
                 break;
 
@@ -45,6 +46,35 @@ public static class IrcMessageFormatter
         return lines;
     }
 
+    /// <summary>
+    /// Convert printable color tags ({F:RRGGBB}, {B:RRGGBB}, {X}) to ANSI escape codes for IRC clients.
+    /// Also passes through content that already uses ANSI codes unchanged.
+    /// </summary>
+    public static string ColorTagsToAnsi(string text)
+    {
+        if (!text.Contains('{'))
+            return text;
+
+        return ColorTagRegex().Replace(text, match =>
+        {
+            if (match.Groups[1].Success) // {X} reset
+                return "\x1b[0m";
+            if (match.Groups[2].Success) // {F:RRGGBB} or {B:RRGGBB}
+            {
+                var hex = match.Groups[3].Value;
+                var r = Convert.ToInt32(hex[..2], 16);
+                var g = Convert.ToInt32(hex[2..4], 16);
+                var b = Convert.ToInt32(hex[4..6], 16);
+                var code = match.Groups[2].Value == "F" ? "38" : "48";
+                return $"\x1b[{code};2;{r};{g};{b}m";
+            }
+            return match.Value;
+        });
+    }
+
+    [GeneratedRegex(@"\{(?:(X)|(?:(F|B):([0-9A-Fa-f]{6})))\}")]
+    private static partial Regex ColorTagRegex();
+
     /// <summary>
     /// Split a message into chunks of approximately maxBytes (UTF-8), at word boundaries.
     /// </summary>