refactor: add attribute for signatures

ChatTwo/Util/SigFinder.cs

@@ -0,0 +1,33 @@
+using System.Reflection;
+using Dalamud.Game;
+using Dalamud.Logging;
+using JetBrains.Annotations;
+
+namespace ChatTwo.Util;
+
+internal static class SigFinder {
+    internal static void ScanFunctions(this SigScanner scanner, object self) {
+        var selfType = self.GetType();
+        var funcs = selfType.GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic)
+            .Select(field => (field, field.GetCustomAttribute<SignatureAttribute>()))
+            .Where(tuple => tuple.Item2 != null);
+        foreach (var (field, attr) in funcs) {
+            if (!scanner.TryScanText(attr!.Signature, out var ptr)) {
+                PluginLog.LogWarning($"Could not find signature for {selfType.Name}.{field.Name}: {attr.Signature}");
+                continue;
+            }
+
+            field.SetValue(self, ptr);
+        }
+    }
+}
+
+[AttributeUsage(AttributeTargets.Field)]
+[MeansImplicitUse(ImplicitUseKindFlags.Assign, ImplicitUseTargetFlags.Itself)]
+internal class SignatureAttribute : Attribute {
+    internal readonly string Signature;
+
+    internal SignatureAttribute(string signature) {
+        this.Signature = signature;
+    }
+}