Split long short-list results up into embed fields

PluralKit.Bot/Lists/ShortRenderer.cs

@@ -1,6 +1,5 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
+using System.Collections.Generic;
+using System.Text;
 
 using DSharpPlus.Entities;
 
@@ -28,7 +27,32 @@ namespace PluralKit.Bot
                 return $"[`{m.Hid}`] **{m.Name.SanitizeMentions()}**";
             }
 
-            eb.Description = string.Join("\n", members.Select(RenderLine));
+            var buf = new StringBuilder();
+            var chunks = new List<string>();
+            
+            // Split the list into properly-sized chunks
+            foreach (var m in members)
+            {
+                var line = RenderLine(m);
+                
+                // First chunk goes in description (2048 chars), rest go in embed values (1000 chars)
+                var lengthLimit = chunks.Count == 0 ? 2048 : 1000;
+                if (buf.Length + line.Length + 1 > lengthLimit)
+                {
+                    chunks.Add(buf.ToString());
+                    buf.Clear();
+                }
+
+                buf.Append(RenderLine(m));
+                buf.Append("\n");
+            }
+            chunks.Add(buf.ToString());
+
+            // Put the first chunk in the description, rest in blank-name embed fields
+            eb.Description = chunks[0];
+            for (var i = 1; i < chunks.Count; i++)
+                // Field name is Unicode zero-width space
+                eb.AddField("\u200B", chunks[i]);
         }
     }
 }