Added a loader which allows Lua scripts to load other Lua scripts

app/MindWork AI Studio/Tools/PluginSystem/NoPlugin.cs

@@ -7,4 +7,4 @@ namespace AIStudio.Tools.PluginSystem;
 /// </summary>
 /// <param name="state">The Lua state that the plugin was loaded into.</param>
 /// <param name="parsingError">The error message that occurred while parsing the plugin.</param>
-public sealed class NoPlugin(LuaState state, string parsingError) : PluginBase(state, PluginType.NONE, parsingError);
+public sealed class NoPlugin(LuaState state, string parsingError) : PluginBase(string.Empty, state, PluginType.NONE, parsingError);

app/MindWork AI Studio/Tools/PluginSystem/PluginBase.cs

@@ -78,7 +78,7 @@ public abstract class PluginBase
     /// </remarks>
     public bool IsValid => this is not NoPlugin && this.baseIssues.Count == 0 && this.pluginIssues.Count == 0;
 
-    protected PluginBase(LuaState state, PluginType type, string parseError = "")
+    protected PluginBase(string path, LuaState state, PluginType type, string parseError = "")
     {
         this.state = state;
         this.Type = type;
@@ -94,6 +94,9 @@ public abstract class PluginBase
         this.state.OpenBitwiseLibrary();
         this.state.OpenCoroutineLibrary();
      
+        // Add the module loader so that the plugin can load other Lua modules:
+        this.state.ModuleLoader = new PluginLoader(path);
+        
         var issues = new List<string>();
         if(!string.IsNullOrWhiteSpace(parseError))
             issues.Add(parseError);

app/MindWork AI Studio/Tools/PluginSystem/PluginFactory.cs

@@ -90,7 +90,7 @@ public static class PluginFactory
         
     }
     
-    public static async Task<PluginBase> Load(string code, CancellationToken cancellationToken = default)
+    public static async Task<PluginBase> Load(string path, string code, CancellationToken cancellationToken = default)
     {
         var state = LuaState.Create();
 
@@ -114,7 +114,7 @@ public static class PluginFactory
         
         return type switch
         {
-            PluginType.LANGUAGE => new PluginLanguage(state, type),
+            PluginType.LANGUAGE => new PluginLanguage(path, state, type),
             
             _ => new NoPlugin(state, "This plugin type is not supported yet. Please try again with a future version of AI Studio.")
         };

app/MindWork AI Studio/Tools/PluginSystem/PluginLoader.cs

@@ -0,0 +1,48 @@
+using System.Text;
+
+using AIStudio.Settings;
+
+using Lua;
+
+namespace AIStudio.Tools.PluginSystem;
+
+/// <summary>
+/// Loads Lua modules from a plugin directory.
+/// </summary>
+/// <remarks>
+/// Any plugin can load Lua modules from its own directory. This class is used to load these modules.
+/// Loading other modules outside the plugin directory is not allowed.
+/// </remarks>
+/// <param name="pluginDirectory">The directory where the plugin is located.</param>
+public sealed class PluginLoader(string pluginDirectory) : ILuaModuleLoader
+{
+    private static readonly string PLUGIN_BASE_PATH = Path.Join(SettingsManager.DataDirectory, "plugins");
+
+    #region Implementation of ILuaModuleLoader
+
+    /// <inheritdoc />
+    public bool Exists(string moduleName)
+    {
+        // Ensure that the user doesn't try to escape the plugin directory:
+        if (moduleName.Contains("..") || pluginDirectory.Contains(".."))
+            return false;
+        
+        // Ensure that the plugin directory is nested in the plugin base path:
+        if (!pluginDirectory.StartsWith(PLUGIN_BASE_PATH, StringComparison.OrdinalIgnoreCase))
+            return false;
+        
+        var path = Path.Join(pluginDirectory, $"{moduleName}.lua");
+        return File.Exists(path);
+    }
+
+    /// <inheritdoc />
+    public async ValueTask<LuaModule> LoadAsync(string moduleName, CancellationToken cancellationToken = default)
+    {
+        var path = Path.Join(pluginDirectory, $"{moduleName}.lua");
+        var code = await File.ReadAllTextAsync(path, Encoding.UTF8, cancellationToken);
+		
+        return new(moduleName, code);
+    }
+
+    #endregion
+}