Added plugin hot reloading (#377)

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

@@ -0,0 +1,33 @@
+namespace AIStudio.Tools.PluginSystem;
+
+public static partial class PluginFactory
+{
+    public static void SetUpHotReloading()
+    {
+        LOG.LogInformation($"Start hot reloading plugins for path '{HOT_RELOAD_WATCHER.Path}'.");
+        try
+        {
+            var messageBus = Program.SERVICE_PROVIDER.GetRequiredService<MessageBus>();
+        
+            HOT_RELOAD_WATCHER.IncludeSubdirectories = true;
+            HOT_RELOAD_WATCHER.NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.FileName;
+            HOT_RELOAD_WATCHER.Filter = "*.lua";
+            HOT_RELOAD_WATCHER.Changed += async (_, args) =>
+            {
+                LOG.LogInformation($"File changed: {args.FullPath}");
+                await LoadAll();
+                await messageBus.SendMessage<bool>(null, Event.PLUGINS_RELOADED);
+            };
+            
+            HOT_RELOAD_WATCHER.EnableRaisingEvents = true;
+        }
+        catch (Exception e)
+        {
+            LOG.LogError(e, "Error while setting up hot reloading.");
+        }
+        finally
+        {
+            LOG.LogInformation("Hot reloading plugins set up.");
+        }
+    }
+}

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

@@ -1,5 +1,3 @@
-using System.Reflection;
-
 using Microsoft.Extensions.FileProviders;
 
 namespace AIStudio.Tools.PluginSystem;

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

@@ -16,6 +16,8 @@ public static partial class PluginFactory
     private static readonly string PLUGINS_ROOT = Path.Join(DATA_DIR, "plugins");
     
     private static readonly string INTERNAL_PLUGINS_ROOT = Path.Join(PLUGINS_ROOT, ".internal");
+    
+    private static readonly FileSystemWatcher HOT_RELOAD_WATCHER = new(PLUGINS_ROOT);
 
     private static readonly List<IPluginMetadata> AVAILABLE_PLUGINS = [];
     
@@ -45,6 +47,8 @@ public static partial class PluginFactory
             return;
         }
         
+        AVAILABLE_PLUGINS.Clear();
+        
         //
         // The easiest way to load all plugins is to find all `plugin.lua` files and load them.
         // By convention, each plugin is enforced to have a `plugin.lua` file.
@@ -136,4 +140,9 @@ public static partial class PluginFactory
             _ => new NoPlugin("This plugin type is not supported yet. Please try again with a future version of AI Studio.")
         };
     }
+    
+    public static void Dispose()
+    {
+        HOT_RELOAD_WATCHER.Dispose();
+    }
 }