Add CopyModSetting API.

Penumbra.Api

@@ -1 +1 @@
-Subproject commit 891eb195c29904824004c45f84b92a9e1dd98ddf
+Subproject commit 36a06e509bf0a7023b4c9b148b06f71f8116cc81

Penumbra/Api/IpcTester.cs

@@ -1084,6 +1084,13 @@ public class IpcTester : IDisposable
                 _lastSettingsError = Ipc.TrySetModPriority.Subscriber( _pi ).Invoke( _settingsCollection, _settingsModDirectory, _settingsModName, _settingsPriority );
             }
 
+            DrawIntro( Ipc.CopyModSettings.Label, "Copy Mod Settings" );
+            if( ImGui.Button( "Copy Settings" ) )
+            {
+                _lastSettingsError = Ipc.CopyModSettings.Subscriber( _pi ).Invoke( _settingsCollection, _settingsModDirectory, _settingsModName );
+            }
+            ImGuiUtil.HoverTooltip( "Copy settings from Mod Directory Name to Mod Name (as directory) in collection." );
+
             DrawIntro( Ipc.TrySetModSetting.Label, "Set Setting(s)" );
             if( _availableSettings == null )
             {

Penumbra/Api/PenumbraApi.cs

@@ -618,6 +618,31 @@ public class PenumbraApi : IDisposable, IPenumbraApi
     }
 
 
+    public PenumbraApiEc CopyModSettings( string? collectionName, string modDirectoryFrom, string modDirectoryTo )
+    {
+        CheckInitialized();
+
+        var sourceModIdx = Penumbra.ModManager.FirstOrDefault( m => string.Equals( m.ModPath.Name, modDirectoryFrom, StringComparison.OrdinalIgnoreCase ) )?.Index ?? -1;
+        var targetModIdx = Penumbra.ModManager.FirstOrDefault( m => string.Equals( m.ModPath.Name, modDirectoryTo, StringComparison.OrdinalIgnoreCase ) )?.Index   ?? -1;
+        if( string.IsNullOrEmpty( collectionName ) )
+        {
+            foreach( var collection in Penumbra.CollectionManager )
+            {
+                collection.CopyModSettings( sourceModIdx, modDirectoryFrom, targetModIdx, modDirectoryTo );
+            }
+        }
+        else if( Penumbra.CollectionManager.ByName( collectionName, out var collection ) )
+        {
+            collection.CopyModSettings( sourceModIdx, modDirectoryFrom, targetModIdx, modDirectoryTo );
+        }
+        else
+        {
+            return PenumbraApiEc.CollectionMissing;
+        }
+
+        return PenumbraApiEc.Success;
+    }
+
     public (PenumbraApiEc, string) CreateTemporaryCollection( string tag, string character, bool forceOverwriteCharacter )
     {
         CheckInitialized();

Penumbra/Api/PenumbraIpcProviders.cs

@@ -91,6 +91,7 @@ public class PenumbraIpcProviders : IDisposable
     internal readonly FuncProvider< string, string, string, string, string, PenumbraApiEc >                  TrySetModSetting;
     internal readonly FuncProvider< string, string, string, string, IReadOnlyList< string >, PenumbraApiEc > TrySetModSettings;
     internal readonly EventProvider< ModSettingChange, string, string, bool >                                ModSettingChanged;
+    internal readonly FuncProvider< string, string, string, PenumbraApiEc >                                  CopyModSettings;
 
     // Temporary
     internal readonly FuncProvider< string, string, bool, (PenumbraApiEc, string) >                            CreateTemporaryCollection;
@@ -191,6 +192,7 @@ public class PenumbraIpcProviders : IDisposable
         ModSettingChanged       = Ipc.ModSettingChanged.Provider( pi,
             () => Api.ModSettingChanged += ModSettingChangedEvent,
             () => Api.ModSettingChanged -= ModSettingChangedEvent );
+        CopyModSettings = Ipc.CopyModSettings.Provider( pi, Api.CopyModSettings );
 
         // Temporary
         CreateTemporaryCollection       = Ipc.CreateTemporaryCollection.Provider( pi, Api.CreateTemporaryCollection );
@@ -287,6 +289,7 @@ public class PenumbraIpcProviders : IDisposable
         TrySetModSetting.Dispose();
         TrySetModSettings.Dispose();
         ModSettingChanged.Dispose();
+        CopyModSettings.Dispose();
 
         // Temporary
         CreateTemporaryCollection.Dispose();

Penumbra/Collections/ModCollection.cs

@@ -3,6 +3,7 @@ using Penumbra.Mods;
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using OtterGui;
 
 namespace Penumbra.Collections;
 
@@ -135,7 +136,7 @@ public partial class ModCollection
         var settings = _settings[ idx ];
         if( settings != null )
         {
-            _unusedSettings[mod.ModPath.Name] = new ModSettings.SavedSettings( settings, mod );
+            _unusedSettings[ mod.ModPath.Name ] = new ModSettings.SavedSettings( settings, mod );
         }
 
         _settings.RemoveAt( idx );
@@ -173,6 +174,63 @@ public partial class ModCollection
         }
     }
 
+    public bool CopyModSettings( int modIdx, string modName, int targetIdx, string targetName )
+    {
+        if( targetName.Length == 0 && targetIdx < 0 || modName.Length == 0 && modIdx < 0 )
+        {
+            return false;
+        }
+
+        // If the source mod exists, convert its settings to saved settings or null if its inheriting.
+        // If it does not exist, check unused settings.
+        // If it does not exist and has no unused settings, also use null.
+        ModSettings.SavedSettings? savedSettings = modIdx >= 0
+            ? _settings[ modIdx ] != null
+                ? new ModSettings.SavedSettings( _settings[ modIdx ]!, Penumbra.ModManager[ modIdx ] )
+                : null
+            : _unusedSettings.TryGetValue( modName, out var s )
+                ? s
+                : null;
+
+        if( targetIdx >= 0 )
+        {
+            if( savedSettings != null )
+            {
+                // The target mod exists and the source settings are not inheriting, convert and fix the settings and copy them.
+                // This triggers multiple events.
+                savedSettings.Value.ToSettings( Penumbra.ModManager[ targetIdx ], out var settings );
+                SetModState( targetIdx, settings.Enabled );
+                SetModPriority( targetIdx, settings.Priority );
+                foreach( var (value, index) in settings.Settings.WithIndex() )
+                {
+                    SetModSetting( targetIdx, index, value );
+                }
+            }
+            else
+            {
+                // The target mod exists, but the source is inheriting, set the target to inheriting.
+                // This triggers events.
+                SetModInheritance( targetIdx, true );
+            }
+        }
+        else
+        {
+            // The target mod does not exist.
+            // Either copy the unused source settings directly if they are not inheriting,
+            // or remove any unused settings for the target if they are inheriting.
+            if( savedSettings != null )
+            {
+                _unusedSettings[ targetName ] = savedSettings.Value;
+            }
+            else
+            {
+                _unusedSettings.Remove( targetName );
+            }
+        }
+
+        return true;
+    }
+
     public override string ToString()
         => Name;
 }

Penumbra/Mods/Manager/Mod.Manager.cs

@@ -52,7 +52,7 @@ public sealed partial class Mod
             mod = null;
             foreach( var m in _mods )
             {
-                if( m.ModPath.Name == modDirectory )
+                if( string.Equals(m.ModPath.Name, modDirectory, StringComparison.OrdinalIgnoreCase) )
                 {
                     mod = m;
                     return true;