9 files changed, 482 insertions, 387 deletions

diff --git a/src/Bindings/ManualBindings.cpp b/src/Bindings/ManualBindings.cpp
index 6e579b364..aebdbc34b 100644
--- a/src/Bindings/ManualBindings.cpp
+++ b/src/Bindings/ManualBindings.cpp
@@ -513,7 +513,7 @@ static int tolua_DoWith(lua_State* tolua_S)
 	{
 		return lua_do_error(tolua_S, "Error in function call '#funcname#': Expected a non-empty string for parameter #1", NumArgs);
 	}
-	if (!lua_isfunction( tolua_S, 3))
+	if (!lua_isfunction(tolua_S, 3))
 	{
 		return lua_do_error(tolua_S, "Error in function call '#funcname#': Expected a function for parameter #2", NumArgs);
 	}
@@ -539,20 +539,21 @@ static int tolua_DoWith(lua_State* tolua_S)
 	class cLuaCallback : public cItemCallback<Ty2>
 	{
 	public:
-		cLuaCallback(lua_State* a_LuaState, int a_FuncRef, int a_TableRef)
-			: LuaState( a_LuaState)
-			, FuncRef( a_FuncRef)
-			, TableRef( a_TableRef)
-		{}
+		cLuaCallback(lua_State* a_LuaState, int a_FuncRef, int a_TableRef):
+			LuaState(a_LuaState),
+			FuncRef(a_FuncRef),
+			TableRef(a_TableRef)
+		{
+		}
 
 	private:
 		virtual bool Item(Ty2 * a_Item) override
 		{
-			lua_rawgeti( LuaState, LUA_REGISTRYINDEX, FuncRef);  /* Push function reference */
+			lua_rawgeti(LuaState, LUA_REGISTRYINDEX, FuncRef);  /* Push function reference */
 			tolua_pushusertype(LuaState, a_Item, Ty2::GetClassStatic());
 			if (TableRef != LUA_REFNIL)
 			{
-				lua_rawgeti( LuaState, LUA_REGISTRYINDEX, TableRef);  /* Push table reference */
+				lua_rawgeti(LuaState, LUA_REGISTRYINDEX, TableRef);  /* Push table reference */
 			}
 
 			int s = lua_pcall(LuaState, (TableRef == LUA_REFNIL ? 1 : 2), 1, 0);
@@ -633,7 +634,8 @@ static int tolua_DoWithID(lua_State* tolua_S)
 			LuaState(a_LuaState),
 			FuncRef(a_FuncRef),
 			TableRef(a_TableRef)
-		{}
+		{
+		}
 
 	private:
 		virtual bool Item(Ty2 * a_Item) override
@@ -699,7 +701,7 @@ static int tolua_DoWithXYZ(lua_State* tolua_S)
 	int ItemX = ((int)tolua_tonumber(tolua_S, 2, 0));
 	int ItemY = ((int)tolua_tonumber(tolua_S, 3, 0));
 	int ItemZ = ((int)tolua_tonumber(tolua_S, 4, 0));
-	if (!lua_isfunction( tolua_S, 5))
+	if (!lua_isfunction(tolua_S, 5))
 	{
 		return lua_do_error(tolua_S, "Error in function call '#funcname#': Expected a function for parameter #4");
 	}
@@ -725,20 +727,21 @@ static int tolua_DoWithXYZ(lua_State* tolua_S)
 	class cLuaCallback : public cItemCallback<Ty2>
 	{
 	public:
-		cLuaCallback(lua_State* a_LuaState, int a_FuncRef, int a_TableRef)
-			: LuaState( a_LuaState)
-			, FuncRef( a_FuncRef)
-			, TableRef( a_TableRef)
-		{}
+		cLuaCallback(lua_State* a_LuaState, int a_FuncRef, int a_TableRef):
+			LuaState(a_LuaState),
+			FuncRef(a_FuncRef),
+			TableRef(a_TableRef)
+		{
+		}
 
 	private:
 		virtual bool Item(Ty2 * a_Item) override
 		{
-			lua_rawgeti( LuaState, LUA_REGISTRYINDEX, FuncRef);  /* Push function reference */
+			lua_rawgeti(LuaState, LUA_REGISTRYINDEX, FuncRef);  /* Push function reference */
 			tolua_pushusertype(LuaState, a_Item, Ty2::GetClassStatic());
 			if (TableRef != LUA_REFNIL)
 			{
-				lua_rawgeti( LuaState, LUA_REGISTRYINDEX, TableRef);  /* Push table reference */
+				lua_rawgeti(LuaState, LUA_REGISTRYINDEX, TableRef);  /* Push table reference */
 			}
 
 			int s = lua_pcall(LuaState, (TableRef == LUA_REFNIL ? 1 : 2), 1, 0);
@@ -794,7 +797,7 @@ static int tolua_ForEachInChunk(lua_State * tolua_S)
 	int ChunkX = ((int)tolua_tonumber(tolua_S, 2, 0));
 	int ChunkZ = ((int)tolua_tonumber(tolua_S, 3, 0));
 
-	if (!lua_isfunction( tolua_S, 4))
+	if (!lua_isfunction(tolua_S, 4))
 	{
 		return lua_do_error(tolua_S, "Error in function call '#funcname#': Expected a function for parameter #3");
 	}
@@ -820,20 +823,21 @@ static int tolua_ForEachInChunk(lua_State * tolua_S)
 	class cLuaCallback : public cItemCallback<Ty2>
 	{
 	public:
-		cLuaCallback(lua_State* a_LuaState, int a_FuncRef, int a_TableRef)
-			: LuaState( a_LuaState)
-			, FuncRef( a_FuncRef)
-			, TableRef( a_TableRef)
-		{}
+		cLuaCallback(lua_State* a_LuaState, int a_FuncRef, int a_TableRef):
+			LuaState(a_LuaState),
+			FuncRef(a_FuncRef),
+			TableRef(a_TableRef)
+		{
+		}
 
 	private:
 		virtual bool Item(Ty2 * a_Item) override
 		{
-			lua_rawgeti( LuaState, LUA_REGISTRYINDEX, FuncRef);  /* Push function reference */
+			lua_rawgeti(LuaState, LUA_REGISTRYINDEX, FuncRef);  /* Push function reference */
 			tolua_pushusertype(LuaState, a_Item, Ty2::GetClassStatic());
 			if (TableRef != LUA_REFNIL)
 			{
-				lua_rawgeti( LuaState, LUA_REGISTRYINDEX, TableRef);  /* Push table reference */
+				lua_rawgeti(LuaState, LUA_REGISTRYINDEX, TableRef);  /* Push table reference */
 			}
 
 			int s = lua_pcall(LuaState, (TableRef == LUA_REFNIL ? 1 : 2), 1, 0);
@@ -908,7 +912,8 @@ static int tolua_ForEachInBox(lua_State * tolua_S)
 		cLuaCallback(cLuaState & a_LuaState, cLuaState::cRef & a_FuncRef) :
 			m_LuaState(a_LuaState),
 			m_FnRef(a_FuncRef)
-		{}
+		{
+		}
 
 	private:
 		// cItemCallback<Ty2> overrides:
@@ -960,7 +965,7 @@ static int tolua_ForEach(lua_State * tolua_S)
 		return lua_do_error(tolua_S, "Error in function call '#funcname#': Not called on an object instance");
 	}
 
-	if (!lua_isfunction( tolua_S, 2))
+	if (!lua_isfunction(tolua_S, 2))
 	{
 		return lua_do_error(tolua_S, "Error in function call '#funcname#': Expected a function for parameter #1");
 	}
@@ -986,20 +991,21 @@ static int tolua_ForEach(lua_State * tolua_S)
 	class cLuaCallback : public cItemCallback<Ty2>
 	{
 	public:
-		cLuaCallback(lua_State* a_LuaState, int a_FuncRef, int a_TableRef)
-			: LuaState( a_LuaState)
-			, FuncRef( a_FuncRef)
-			, TableRef( a_TableRef)
-		{}
+		cLuaCallback(lua_State* a_LuaState, int a_FuncRef, int a_TableRef):
+			LuaState(a_LuaState),
+			FuncRef(a_FuncRef),
+			TableRef(a_TableRef)
+		{
+		}
 
 	private:
 		virtual bool Item(Ty2 * a_Item) override
 		{
-			lua_rawgeti( LuaState, LUA_REGISTRYINDEX, FuncRef);  /* Push function reference */
-			tolua_pushusertype( LuaState, a_Item, Ty2::GetClassStatic());
+			lua_rawgeti(LuaState, LUA_REGISTRYINDEX, FuncRef);  /* Push function reference */
+			tolua_pushusertype(LuaState, a_Item, Ty2::GetClassStatic());
 			if (TableRef != LUA_REFNIL)
 			{
-				lua_rawgeti( LuaState, LUA_REGISTRYINDEX, TableRef);  /* Push table reference */
+				lua_rawgeti(LuaState, LUA_REGISTRYINDEX, TableRef);  /* Push table reference */
 			}
 
 			int s = lua_pcall(LuaState, (TableRef == LUA_REFNIL ? 1 : 2), 1, 0);
@@ -1010,7 +1016,7 @@ static int tolua_ForEach(lua_State * tolua_S)
 
 			if (lua_isboolean(LuaState, -1))
 			{
-				return (tolua_toboolean( LuaState, -1, 0) > 0);
+				return (tolua_toboolean(LuaState, -1, 0) > 0);
 			}
 			return false;  /* Continue enumeration */
 		}
@@ -1447,29 +1453,12 @@ static int tolua_cWorld_ScheduleTask(lua_State * tolua_S)
 
 static int tolua_cPluginManager_GetAllPlugins(lua_State * tolua_S)
 {
-	cPluginManager * self = (cPluginManager *)tolua_tousertype(tolua_S, 1, nullptr);
-
-	const cPluginManager::PluginMap & AllPlugins = self->GetAllPlugins();
+	// API function no longer available:
+	LOGWARNING("cPluginManager:GetAllPlugins() is no longer available, use cPluginManager:ForEachPlugin() instead");
+	cLuaState::LogStackTrace(tolua_S);
 
+	// Return an empty table:
 	lua_newtable(tolua_S);
-	int index = 1;
-	cPluginManager::PluginMap::const_iterator iter = AllPlugins.begin();
-	while (iter != AllPlugins.end())
-	{
-		const cPlugin* Plugin = iter->second;
-		tolua_pushstring(tolua_S, iter->first.c_str());
-		if (Plugin != nullptr)
-		{
-			tolua_pushusertype(tolua_S, (void *)Plugin, "const cPlugin");
-		}
-		else
-		{
-			tolua_pushboolean(tolua_S, 0);
-		}
-		lua_rawset(tolua_S, -3);
-		++iter;
-		++index;
-	}
 	return 1;
 }
 
@@ -1493,6 +1482,18 @@ static int tolua_cPluginManager_GetCurrentPlugin(lua_State * S)
 
 
 
+static int tolua_cPluginManager_GetPlugin(lua_State * tolua_S)
+{
+	// API function no longer available:
+	LOGWARNING("cPluginManager:GetPlugin() is no longer available. Use cPluginManager:DoWithPlugin() or cPluginManager:CallPlugin() instead.");
+	cLuaState::LogStackTrace(tolua_S);
+	return 0;
+}
+
+
+
+
+
 static int tolua_cPluginManager_LogStackTrace(lua_State * S)
 {
 	cLuaState::LogStackTrace(S);
@@ -1694,10 +1695,11 @@ static int tolua_cPluginManager_ForEachCommand(lua_State * tolua_S)
 	class cLuaCallback : public cPluginManager::cCommandEnumCallback
 	{
 	public:
-		cLuaCallback(lua_State * a_LuaState, int a_FuncRef)
-			: LuaState( a_LuaState)
-			, FuncRef( a_FuncRef)
-		{}
+		cLuaCallback(lua_State * a_LuaState, int a_FuncRef):
+			LuaState(a_LuaState),
+			FuncRef(a_FuncRef)
+		{
+		}
 
 	private:
 		virtual bool Command(const AString & a_Command, const cPlugin * a_Plugin, const AString & a_Permission, const AString & a_HelpString) override
@@ -1717,7 +1719,7 @@ static int tolua_cPluginManager_ForEachCommand(lua_State * tolua_S)
 
 			if (lua_isboolean(LuaState, -1))
 			{
-				return (tolua_toboolean( LuaState, -1, 0) > 0);
+				return (tolua_toboolean(LuaState, -1, 0) > 0);
 			}
 			return false;  /* Continue enumeration */
 		}
@@ -1771,10 +1773,11 @@ static int tolua_cPluginManager_ForEachConsoleCommand(lua_State * tolua_S)
 	class cLuaCallback : public cPluginManager::cCommandEnumCallback
 	{
 	public:
-		cLuaCallback(lua_State * a_LuaState, int a_FuncRef)
-			: LuaState( a_LuaState)
-			, FuncRef( a_FuncRef)
-		{}
+		cLuaCallback(lua_State * a_LuaState, int a_FuncRef):
+			LuaState(a_LuaState),
+			FuncRef(a_FuncRef)
+		{
+		}
 
 	private:
 		virtual bool Command(const AString & a_Command, const cPlugin * a_Plugin, const AString & a_Permission, const AString & a_HelpString) override
@@ -1794,7 +1797,7 @@ static int tolua_cPluginManager_ForEachConsoleCommand(lua_State * tolua_S)
 
 			if (lua_isboolean(LuaState, -1))
 			{
-				return (tolua_toboolean( LuaState, -1, 0) > 0);
+				return (tolua_toboolean(LuaState, -1, 0) > 0);
 			}
 			return false;  /* Continue enumeration */
 		}
@@ -2011,7 +2014,11 @@ static int tolua_cPluginManager_CallPlugin(lua_State * tolua_S)
 		
 		virtual bool Item(cPlugin * a_Plugin) override
 		{
-			m_NumReturns = ((cPluginLua *)a_Plugin)->CallFunctionFromForeignState(
+			if (!a_Plugin->IsLoaded())
+			{
+				return false;
+			}
+			m_NumReturns = static_cast<cPluginLua *>(a_Plugin)->CallFunctionFromForeignState(
 				m_FunctionName, m_SrcLuaState, 4, lua_gettop(m_SrcLuaState)
 			);
 			return true;
@@ -2019,9 +2026,6 @@ static int tolua_cPluginManager_CallPlugin(lua_State * tolua_S)
 	} Callback(FunctionName, L);
 	if (!cPluginManager::Get()->DoWithPlugin(PluginName, Callback))
 	{
-		// TODO 2014_01_20 _X: This might be too much logging, plugins cannot know if other plugins are loaded (async)
-		LOGWARNING("cPluginManager::CallPlugin: No such plugin name (\"%s\")", PluginName.c_str());
-		L.LogStackTrace();
 		return 0;
 	}
 	return Callback.m_NumReturns;
@@ -2031,6 +2035,21 @@ static int tolua_cPluginManager_CallPlugin(lua_State * tolua_S)
 
 
 
+static int tolua_cPluginManager_FindPlugins(lua_State * tolua_S)
+{
+	// API function no longer exists:
+	LOGWARNING("cPluginManager:FindPlugins() is obsolete, use cPluginManager:RefreshPluginList() instead!");
+	cLuaState::LogStackTrace(tolua_S);
+
+	// Still, do the actual work performed by the API function when it existed:
+	cPluginManager::Get()->RefreshPluginList();
+	return 0;
+}
+
+
+
+
+
 static int tolua_cWorld_ChunkStay(lua_State * tolua_S)
 {
 	/* Function signature:
@@ -2337,40 +2356,40 @@ static int tolua_cPluginLua_AddWebTab(lua_State * tolua_S)
 
 
 
-static int tolua_cPluginLua_AddTab(lua_State* tolua_S)
+static int tolua_cPlugin_GetDirectory(lua_State * tolua_S)
 {
-	cPluginLua * self = (cPluginLua *) tolua_tousertype(tolua_S, 1, nullptr);
-	LOGWARN("WARNING: Using deprecated function AddTab()! Use AddWebTab() instead. (plugin \"%s\" in folder \"%s\")",
-		self->GetName().c_str(), self->GetDirectory().c_str()
-	);
-	return tolua_cPluginLua_AddWebTab( tolua_S);
+	cLuaState L(tolua_S);
+	
+	// Log the obsoletion warning:
+	LOGWARNING("cPlugin:GetDirectory() is obsolete, use cPlugin:GetFolderName() instead.");
+	L.LogStackTrace();
+	
+	// Retrieve the params:
+	cPlugin * Plugin = static_cast<cPluginLua *>(tolua_tousertype(tolua_S, 1, nullptr));
+	
+	// Get the folder name:
+	L.Push(Plugin->GetFolderName());
+	return 1;
 }
 
 
 
 
 
-static int tolua_cPlugin_Call(lua_State * tolua_S)
+static int tolua_cPlugin_GetLocalDirectory(lua_State * tolua_S)
 {
 	cLuaState L(tolua_S);
 	
 	// Log the obsoletion warning:
-	LOGWARNING("cPlugin:Call() is obsolete and unsafe, use cPluginManager:CallPlugin() instead.");
+	LOGWARNING("cPlugin:GetLocalDirectory() is obsolete, use cPlugin:GetLocalFolder() instead.");
 	L.LogStackTrace();
 	
-	// Retrieve the params: plugin and the function name to call
-	cPluginLua * TargetPlugin = (cPluginLua *) tolua_tousertype(tolua_S, 1, nullptr);
-	AString FunctionName = tolua_tostring(tolua_S, 2, "");
+	// Retrieve the params:
+	cPlugin * Plugin = static_cast<cPluginLua *>(tolua_tousertype(tolua_S, 1, nullptr));
 	
-	// Call the function:
-	int NumReturns = TargetPlugin->CallFunctionFromForeignState(FunctionName, L, 3, lua_gettop(L));
-	if (NumReturns < 0)
-	{
-		LOGWARNING("cPlugin::Call() failed to call destination function");
-		L.LogStackTrace();
-		return 0;
-	}
-	return NumReturns;
+	// Get the folder:
+	L.Push(Plugin->GetLocalFolder());
+	return 1;
 }
 
 
@@ -2639,8 +2658,8 @@ static int tolua_cWebPlugin_GetTabNames(lua_State * tolua_S)
 	{
 		const AString & FancyName = iter->first;
 		const AString & WebName = iter->second;
-		tolua_pushstring( tolua_S, WebName.c_str());  // Because the WebName is supposed to be unique, use it as key
-		tolua_pushstring( tolua_S, FancyName.c_str());
+		tolua_pushstring(tolua_S, WebName.c_str());  // Because the WebName is supposed to be unique, use it as key
+		tolua_pushstring(tolua_S, FancyName.c_str());
 		//
 		lua_rawset(tolua_S, -3);
 		++iter;
@@ -3792,7 +3811,8 @@ void ManualBindings::Bind(lua_State * tolua_S)
 		tolua_endmodule(tolua_S);
 		
 		tolua_beginmodule(tolua_S, "cPlugin");
-			tolua_function(tolua_S, "Call", tolua_cPlugin_Call);
+			tolua_function(tolua_S, "GetDirectory",      tolua_cPlugin_GetDirectory);
+			tolua_function(tolua_S, "GetLocalDirectory", tolua_cPlugin_GetLocalDirectory);
 		tolua_endmodule(tolua_S);
 		
 		tolua_beginmodule(tolua_S, "cPluginManager");
@@ -3800,10 +3820,13 @@ void ManualBindings::Bind(lua_State * tolua_S)
 			tolua_function(tolua_S, "BindCommand",           tolua_cPluginManager_BindCommand);
 			tolua_function(tolua_S, "BindConsoleCommand",    tolua_cPluginManager_BindConsoleCommand);
 			tolua_function(tolua_S, "CallPlugin",            tolua_cPluginManager_CallPlugin);
+			tolua_function(tolua_S, "FindPlugins",           tolua_cPluginManager_FindPlugins);
 			tolua_function(tolua_S, "ForEachCommand",        tolua_cPluginManager_ForEachCommand);
 			tolua_function(tolua_S, "ForEachConsoleCommand", tolua_cPluginManager_ForEachConsoleCommand);
+			tolua_function(tolua_S, "ForEachPlugin",         tolua_ForEach<cPluginManager, cPlugin, &cPluginManager::ForEachPlugin>);
 			tolua_function(tolua_S, "GetAllPlugins",         tolua_cPluginManager_GetAllPlugins);
 			tolua_function(tolua_S, "GetCurrentPlugin",      tolua_cPluginManager_GetCurrentPlugin);
+			tolua_function(tolua_S, "GetPlugin",             tolua_cPluginManager_GetPlugin);
 			tolua_function(tolua_S, "LogStackTrace",         tolua_cPluginManager_LogStackTrace);
 		tolua_endmodule(tolua_S);
 		
@@ -3819,7 +3842,6 @@ void ManualBindings::Bind(lua_State * tolua_S)
 		tolua_endmodule(tolua_S);
 
 		tolua_beginmodule(tolua_S, "cPluginLua");
-			tolua_function(tolua_S, "AddTab", tolua_cPluginLua_AddTab);
 			tolua_function(tolua_S, "AddWebTab", tolua_cPluginLua_AddWebTab);
 		tolua_endmodule(tolua_S);
 
diff --git a/src/Bindings/Plugin.cpp b/src/Bindings/Plugin.cpp
index 98ccfb88c..2f2771e38 100644
--- a/src/Bindings/Plugin.cpp
+++ b/src/Bindings/Plugin.cpp
@@ -7,11 +7,11 @@
 
 
 
-cPlugin::cPlugin(const AString & a_PluginDirectory) :
-	m_Language(E_CPP),
-	m_Name(a_PluginDirectory),
+cPlugin::cPlugin(const AString & a_FolderName) :
+	m_Status(cPluginManager::psDisabled),
+	m_Name(a_FolderName),
 	m_Version(0),
-	m_Directory(a_PluginDirectory)
+	m_FolderName(a_FolderName)
 {
 }
 
@@ -28,9 +28,33 @@ cPlugin::~cPlugin()
 
 
 
+void cPlugin::Unload(void)
+{
+	auto pm = cPluginManager::Get();
+	pm->RemovePluginCommands(this);
+	pm->RemovePluginConsoleCommands(this);
+	pm->RemoveHooks(this);
+	OnDisable();
+	m_Status = cPluginManager::psUnloaded;
+	m_LoadError.clear();
+}
+
+
+
+
+
 AString cPlugin::GetLocalFolder(void) const
 {
-	return std::string("Plugins/") + m_Directory;
+	return std::string("Plugins/") + m_FolderName;
+}
+
+
+
+
+void cPlugin::SetLoadError(const AString & a_LoadError)
+{
+	m_Status = cPluginManager::psError;
+	m_LoadError = a_LoadError;
 }
 
 
diff --git a/src/Bindings/Plugin.h b/src/Bindings/Plugin.h
index 3f9fa7655..5c43f9042 100644
--- a/src/Bindings/Plugin.h
+++ b/src/Bindings/Plugin.h
@@ -1,30 +1,16 @@
 
-#pragma once
-
-#include "Defines.h"
+// Plugin.h
 
-class cCommandOutputCallback;
-class cItems;
-class cHopperEntity;
+// Declares the cPlugin class representing an interface that a plugin implementation needs to expose, with some helping functions
 
 
 
-class cBlockEntityWithItems;
-class cClientHandle;
-class cPickup;
-class cPlayer;
-class cProjectileEntity;
-class cEntity;
-class cMonster;
-class cWorld;
-class cChunkDesc;
-struct TakeDamageInfo;
 
 
-// fwd: CraftingRecipes.h
-class cCraftingGrid;
-class cCraftingRecipe;
+#pragma once
 
+#include "Defines.h"
+#include "PluginManager.h"
 
 
 
@@ -35,11 +21,23 @@ class cPlugin
 public:
 	// tolua_end
 	
-	cPlugin( const AString & a_PluginDirectory);
+	/** Creates a new instance.
+	a_FolderName is the name of the folder (in the Plugins folder) from which the plugin is loaded.
+	The plugin's name defaults to the folder name. */
+	cPlugin(const AString & a_FolderName);
+
 	virtual ~cPlugin();
 	
+	/** Called as the last call into the plugin before it is unloaded. */
 	virtual void OnDisable(void) {}
-	virtual bool Initialize(void) = 0;
+
+	/** Loads and initializes the plugin. Sets m_Status to psLoaded or psError accordingly.
+	Returns true if the initialization succeeded, false otherwise. */
+	virtual bool Load(void) = 0;
+
+	/** Unloads the plugin. Sets m_Status to psDisabled.
+	The default implementation removes the plugin's associations with cPluginManager, descendants should call it as well. */
+	virtual void Unload(void);
 
 	// Called each tick
 	virtual void Tick(float a_Dt) = 0;
@@ -109,19 +107,17 @@ public:
 	
 	/** Handles the command split into a_Split, issued by player a_Player.
 	Command permissions have already been checked.
-	Returns true if command handled successfully
-	*/
+	Returns true if command handled successfully. */
 	virtual bool HandleCommand(const AStringVector & a_Split, cPlayer & a_Player, const AString & a_FullCommand) = 0;
 	
 	/** Handles the console command split into a_Split.
-	Returns true if command handled successfully. Output is to be sent to the a_Output callback.
-	*/
+	Returns true if command handled successfully. Output is to be sent to the a_Output callback. */
 	virtual bool HandleConsoleCommand(const AStringVector & a_Split, cCommandOutputCallback & a_Output, const AString & a_FullCommand) = 0;
 	
-	/// All bound commands are to be removed, do any language-dependent cleanup here
+	/** All bound commands are to be removed, do any language-dependent cleanup here */
 	virtual void ClearCommands(void) {}
 	
-	/// All bound console commands are to be removed, do any language-dependent cleanup here
+	/** All bound console commands are to be removed, do any language-dependent cleanup here */
 	virtual void ClearConsoleCommands(void) {}
 	
 	// tolua_begin
@@ -131,28 +127,43 @@ public:
 	int GetVersion(void) const     { return m_Version; }
 	void SetVersion(int a_Version) { m_Version = a_Version; }
 
-	const AString & GetDirectory(void) const {return m_Directory; }
-	AString GetLocalDirectory(void) const {return GetLocalFolder(); }  // OBSOLETE, use GetLocalFolder() instead
+	/** Returns the name of the folder (in the Plugins folder) from which the plugin is loaded. */
+	const AString & GetFolderName(void) const {return m_FolderName; }
+
+	/** Returns the folder relative to the MCS Executable, from which the plugin is loaded. */
 	AString GetLocalFolder(void) const;
+
+	/** Returns the error encountered while loading the plugin. Only valid if m_Status == psError. */
+	const AString & GetLoadError(void) const { return m_LoadError; }
+
+	cPluginManager::ePluginStatus GetStatus(void) const { return m_Status; }
+
+	bool IsLoaded(void) const { return (m_Status == cPluginManager::psLoaded); }
 	// tolua_end
 	
+	// Needed for ManualBindings' tolua_ForEach<>
+	static const char * GetClassStatic(void) { return "cPlugin"; }
+
+protected:
+	friend class cPluginManager;
+
+	cPluginManager::ePluginStatus m_Status;
 
-	/* This should not be exposed to scripting languages */
-	enum PluginLanguage
-	{
-		E_CPP,
-		E_LUA,
-		E_SQUIRREL,  // OBSOLETE, but kept in place to remind us of the horrors lurking in the history
-	};
-	PluginLanguage GetLanguage() { return m_Language; }
-	void SetLanguage( PluginLanguage a_Language) { m_Language = a_Language; }
-
-private:
-	PluginLanguage m_Language;
+	/** The name of the plugin, used to identify the plugin in the system and for inter-plugin calls. */
 	AString m_Name;
+
 	int m_Version;
 
-	AString m_Directory;
+	/** Name of the folder (in the Plugins folder) from which the plugin is loaded. */
+	AString m_FolderName;
+
+	/** The error encountered while loading the plugin.
+	Only valid if m_Status == psError. */
+	AString m_LoadError;
+
+
+	/** Sets m_LoadError to the specified string and m_Status to psError. */
+	void SetLoadError(const AString & a_LoadError);
 };  // tolua_export
 
 
diff --git a/src/Bindings/PluginLua.cpp b/src/Bindings/PluginLua.cpp
index 9bbac92b0..cb2ea3b45 100644
--- a/src/Bindings/PluginLua.cpp
+++ b/src/Bindings/PluginLua.cpp
@@ -93,7 +93,7 @@ void cPluginLua::Close(void)
 
 
 
-bool cPluginLua::Initialize(void)
+bool cPluginLua::Load(void)
 {
 	cCSLock Lock(m_CriticalSection);
 	if (!m_LuaState.IsValid())
@@ -144,6 +144,7 @@ bool cPluginLua::Initialize(void)
 	// Warn if there are no Lua files in the plugin folder:
 	if (LuaFiles.empty())
 	{
+		SetLoadError("No lua files found, plugin is probably missing.");
 		LOGWARNING("No lua files found: plugin %s is missing.", GetName().c_str());
 		Close();
 		return false;
@@ -155,6 +156,7 @@ bool cPluginLua::Initialize(void)
 		AString Path = PluginPath + *itr;
 		if (!m_LuaState.LoadFile(Path))
 		{
+			SetLoadError(Printf("Failed to load file %s.", itr->c_str()));
 			Close();
 			return false;
 		}
@@ -164,6 +166,8 @@ bool cPluginLua::Initialize(void)
 		AString Path = PluginPath + "Info.lua";
 		if (!m_LuaState.LoadFile(Path))
 		{
+			SetLoadError("Failed to load file Info.lua.");
+			m_Status = cPluginManager::psError;
 			Close();
 			return false;
 		}
@@ -173,17 +177,20 @@ bool cPluginLua::Initialize(void)
 	bool res = false;
 	if (!m_LuaState.Call("Initialize", this, cLuaState::Return, res))
 	{
+		SetLoadError("Cannot call the Initialize() function.");
 		LOGWARNING("Error in plugin %s: Cannot call the Initialize() function. Plugin is temporarily disabled.", GetName().c_str());
 		Close();
 		return false;
 	}
 	if (!res)
 	{
+		SetLoadError("The Initialize() function failed.");
 		LOGINFO("Plugin %s: Initialize() call failed, plugin is temporarily disabled.", GetName().c_str());
 		Close();
 		return false;
 	}
 
+	m_Status = cPluginManager::psLoaded;
 	return true;
 }
 
@@ -191,6 +198,16 @@ bool cPluginLua::Initialize(void)
 
 
 
+void cPluginLua::Unload(void)
+{
+	super::Unload();
+	Close();
+}
+
+
+
+
+
 void cPluginLua::OnDisable(void)
 {
 	cCSLock Lock(m_CriticalSection);
diff --git a/src/Bindings/PluginLua.h b/src/Bindings/PluginLua.h
index c14b02687..70d203244 100644
--- a/src/Bindings/PluginLua.h
+++ b/src/Bindings/PluginLua.h
@@ -32,6 +32,8 @@ class cPluginLua :
 	public cPlugin,
 	public cWebPlugin
 {
+	typedef cPlugin super;
+
 public:
 	// tolua_end
 	
@@ -96,7 +98,8 @@ public:
 	~cPluginLua();
 
 	virtual void OnDisable(void) override;
-	virtual bool Initialize(void) override;
+	virtual bool Load(void) override;
+	virtual void Unload(void) override;
 
 	virtual void Tick(float a_Dt) override;
 
diff --git a/src/Bindings/PluginManager.cpp b/src/Bindings/PluginManager.cpp
index 8935f7dd3..45a778eda 100644
--- a/src/Bindings/PluginManager.cpp
+++ b/src/Bindings/PluginManager.cpp
@@ -59,39 +59,48 @@ void cPluginManager::ReloadPlugins(void)
 
 
 
-void cPluginManager::FindPlugins(void)
+void cPluginManager::RefreshPluginList(void)
 {
+	// Get a list of currently available folders:
 	AString PluginsPath = GetPluginsPath() + "/";
-
-	// First get a clean list of only the currently running plugins, we don't want to mess those up
-	for (PluginMap::iterator itr = m_Plugins.begin(); itr != m_Plugins.end();)
+	AStringVector Contents = cFile::GetFolderContents(PluginsPath.c_str());
+	AStringVector Folders;
+	for (auto & item: Contents)
 	{
-		if (itr->second == nullptr)
+		if ((item == ".") || (item == "..") || (!cFile::IsFolder(PluginsPath + item)))
 		{
-			PluginMap::iterator thiz = itr;
-			++thiz;
-			m_Plugins.erase( itr);
-			itr = thiz;
+			// We only want folders, and don't want "." or ".."
 			continue;
 		}
-		++itr;
-	}
+		Folders.push_back(item);
+	}  // for item - Contents[]
 
-	AStringVector Files = cFile::GetFolderContents(PluginsPath.c_str());
-	for (AStringVector::const_iterator itr = Files.begin(); itr != Files.end(); ++itr)
+	// Set all plugins with invalid folders as psNotFound:
+	for (auto & plugin: m_Plugins)
 	{
-		if ((*itr == ".") || (*itr == "..") || (!cFile::IsFolder(PluginsPath + *itr)))
+		if (std::find(Folders.cbegin(), Folders.cend(), plugin->GetFolderName()) == Folders.end())
 		{
-			// We only want folders, and don't want "." or ".."
-			continue;
+			plugin->m_Status = psNotFound;
 		}
+	}  // for plugin - m_Plugins[]
 
-		// Add plugin name/directory to the list
-		if (m_Plugins.find(*itr) == m_Plugins.end())
+	// Add all newly discovered plugins:
+	for (auto & folder: Folders)
+	{
+		bool hasFound = false;
+		for (auto & plugin: m_Plugins)
 		{
-			m_Plugins[*itr] = nullptr;
+			if (plugin->GetFolderName() == folder)
+			{
+				hasFound = true;
+				break;
+			}
+		}  // for plugin - m_Plugins[]
+		if (!hasFound)
+		{
+			m_Plugins.push_back(std::make_shared<cPluginLua>(folder));
 		}
-	}
+	}  // for folder - Folders[]
 }
 
 
@@ -112,57 +121,23 @@ void cPluginManager::ReloadPluginsNow(void)
 void cPluginManager::ReloadPluginsNow(cIniFile & a_SettingsIni)
 {
 	LOG("-- Loading Plugins --");
+
+	// Unload any existing plugins:
 	m_bReloadPlugins = false;
 	UnloadPluginsNow();
 
-	FindPlugins();
-
-	cServer::BindBuiltInConsoleCommands();
-
-	// Check if the Plugins section exists.
-	int KeyNum = a_SettingsIni.FindKey("Plugins");
+	// Refresh the list of plugins to load new ones from disk / remove the deleted ones:
+	RefreshPluginList();
 
-	if (KeyNum == -1)
+	// Load the plugins:
+	AStringVector ToLoad = GetFoldersToLoad(a_SettingsIni);
+	for (auto & pluginFolder: ToLoad)
 	{
-		InsertDefaultPlugins(a_SettingsIni);
-		KeyNum = a_SettingsIni.FindKey("Plugins");
-	}
-
-	// How many plugins are there?
-	int NumPlugins = a_SettingsIni.GetNumValues(KeyNum);
-
-	for (int i = 0; i < NumPlugins; i++)
-	{
-		AString ValueName = a_SettingsIni.GetValueName(KeyNum, i);
-		if (ValueName.compare("Plugin") == 0)
-		{
-			AString PluginFile = a_SettingsIni.GetValue(KeyNum, i);
-			if (!PluginFile.empty())
-			{
-				if (m_Plugins.find(PluginFile) != m_Plugins.end())
-				{
-					LoadPlugin(PluginFile);
-				}
-			}
-		}
-	}
-
-
-	// Remove invalid plugins from the PluginMap.
-	for (PluginMap::iterator itr = m_Plugins.begin(); itr != m_Plugins.end();)
-	{
-		if (itr->second == nullptr)
-		{
-			PluginMap::iterator thiz = itr;
-			++thiz;
-			m_Plugins.erase(itr);
-			itr = thiz;
-			continue;
-		}
-		++itr;
-	}
+		LoadPlugin(pluginFolder);
+	}  // for pluginFolder - ToLoad[]
 
-	size_t NumLoadedPlugins = GetNumPlugins();
+	// Log a report of the loading process
+	size_t NumLoadedPlugins = GetNumLoadedPlugins();
 	if (NumLoadedPlugins == 0)
 	{
 		LOG("-- No Plugins Loaded --");
@@ -173,7 +148,7 @@ void cPluginManager::ReloadPluginsNow(cIniFile & a_SettingsIni)
 	}
 	else
 	{
-		LOG("-- Loaded %i Plugins --", (int)NumLoadedPlugins);
+		LOG("-- Loaded %u Plugins --", static_cast<unsigned>(NumLoadedPlugins));
 	}
 	CallHookPluginsLoaded();
 }
@@ -200,12 +175,21 @@ void cPluginManager::InsertDefaultPlugins(cIniFile & a_SettingsIni)
 
 void cPluginManager::Tick(float a_Dt)
 {
-	while (!m_DisablePluginList.empty())
+	// Unload plugins that have been scheduled for unloading:
+	AStringVector PluginsToUnload;
 	{
-		RemovePlugin(m_DisablePluginList.front());
-		m_DisablePluginList.pop_front();
+		cCSLock Lock(m_CSPluginsToUnload);
+		std::swap(m_PluginsToUnload, PluginsToUnload);
 	}
+	for (auto & plugin: m_Plugins)
+	{
+		if (std::find(PluginsToUnload.cbegin(), PluginsToUnload.cend(), plugin->GetFolderName()) != PluginsToUnload.cend())
+		{
+			plugin->Unload();
+		}
+	}  // for plugin - m_Plugins[]
 
+	// If a plugin reload has been scheduled, reload now:
 	if (m_bReloadPlugins)
 	{
 		ReloadPluginsNow();
@@ -1477,68 +1461,56 @@ cPluginManager::CommandResult cPluginManager::HandleCommand(cPlayer & a_Player,
 
 
 
-cPlugin * cPluginManager::GetPlugin(const AString & a_Plugin) const
+void cPluginManager::UnloadPluginsNow()
 {
-	for (PluginMap::const_iterator itr = m_Plugins.begin(); itr != m_Plugins.end(); ++itr)
-	{
-		if (itr->second == nullptr)
-		{
-			// The plugin is currently unloaded
-			continue;
-		}
+	// Remove all bindings:
+	m_Hooks.clear();
+	m_Commands.clear();
+	m_ConsoleCommands.clear();
+
+	// Re-bind built-in console commands:
+	cServer::BindBuiltInConsoleCommands();
 
-		if (itr->second->GetName().compare(a_Plugin) == 0)
+	// Unload all loaded plugins:
+	for (auto & plugin: m_Plugins)
+	{
+		if (plugin->IsLoaded())
 		{
-			return itr->second;
+			plugin->Unload();
 		}
 	}
-	return 0;
 }
 
 
 
 
 
-const cPluginManager::PluginMap & cPluginManager::GetAllPlugins() const
+void cPluginManager::UnloadPlugin(const AString & a_PluginFolder)
 {
-	return m_Plugins;
+	cCSLock Lock(m_CSPluginsToUnload);
+	m_PluginsToUnload.push_back(a_PluginFolder);
 }
 
 
 
 
 
-void cPluginManager::UnloadPluginsNow()
+bool cPluginManager::LoadPlugin(const AString & a_FolderName)
 {
-	m_Hooks.clear();
-
-	while (!m_Plugins.empty())
+	for (auto & plugin: m_Plugins)
 	{
-		RemovePlugin(m_Plugins.begin()->second);
-	}
-
-	m_Commands.clear();
-	m_ConsoleCommands.clear();
-}
-
-
-
-
-
-bool cPluginManager::DisablePlugin(const AString & a_PluginName)
-{
-	PluginMap::iterator itr = m_Plugins.find(a_PluginName);
-	if (itr == m_Plugins.end())
-	{
-		return false;
-	}
+		if (plugin->GetFolderName() == a_FolderName)
+		{
+			if (!plugin->IsLoaded())
+			{
+				return plugin->Load();
+			}
+			return true;
+		}
+	}  // for plugin - m_Plugins[]
 
-	if (itr->first.compare(a_PluginName) == 0)  // _X 2013_02_01: wtf? Isn't this supposed to be what find() does?
-	{
-		m_DisablePluginList.push_back(itr->second);
-		itr->second = nullptr;  // Get rid of this thing right away
-		return true;
-	}
+	// Plugin not found
+	LOGD("%s: Plugin folder %s not found in the list of plugins.", __FUNCTION__, a_FolderName.c_str());
 	return false;
 }
 
@@ -1546,15 +1518,6 @@ bool cPluginManager::DisablePlugin(const AString & a_PluginName)
 
 
 
-bool cPluginManager::LoadPlugin(const AString & a_PluginName)
-{
-	return AddPlugin(new cPluginLua(a_PluginName.c_str()));
-}
-
-
-
-
-
 void cPluginManager::RemoveHooks(cPlugin * a_Plugin)
 {
 	for (HookMap::iterator itr = m_Hooks.begin(), end = m_Hooks.end(); itr != end; ++itr)
@@ -1567,32 +1530,6 @@ void cPluginManager::RemoveHooks(cPlugin * a_Plugin)
 
 
 
-void cPluginManager::RemovePlugin(cPlugin * a_Plugin)
-{
-	for (PluginMap::iterator itr = m_Plugins.begin(); itr != m_Plugins.end(); ++itr)
-	{
-		if (itr->second == a_Plugin)
-		{
-			m_Plugins.erase(itr);
-			break;
-		}
-	}
-
-	RemovePluginCommands(a_Plugin);
-	RemovePluginConsoleCommands(a_Plugin);
-	RemoveHooks(a_Plugin);
-	if (a_Plugin != nullptr)
-	{
-		a_Plugin->OnDisable();
-	}
-	delete a_Plugin;
-	a_Plugin = nullptr;
-}
-
-
-
-
-
 void cPluginManager::RemovePluginCommands(cPlugin * a_Plugin)
 {
 	if (a_Plugin != nullptr)
@@ -1836,31 +1773,31 @@ bool cPluginManager::IsValidHookType(int a_HookType)
 bool cPluginManager::DoWithPlugin(const AString & a_PluginName, cPluginCallback & a_Callback)
 {
 	// TODO: Implement locking for plugins
-	PluginMap::iterator itr = m_Plugins.find(a_PluginName);
-	if ((itr == m_Plugins.end()) || (itr->second == nullptr))
+	for (auto & plugin: m_Plugins)
 	{
-		return false;
+		if (plugin->GetName() == a_PluginName)
+		{
+			return a_Callback.Item(plugin.get());
+		}
 	}
-	return a_Callback.Item(itr->second);
+	return false;
 }
 
 
 
 
 
-bool cPluginManager::AddPlugin(cPlugin * a_Plugin)
+bool cPluginManager::ForEachPlugin(cPluginCallback & a_Callback)
 {
-	m_Plugins[a_Plugin->GetDirectory()] = a_Plugin;
-
-	if (a_Plugin->Initialize())
+	// TODO: Implement locking for plugins
+	for (auto & plugin: m_Plugins)
 	{
-		// Initialization OK
-		return true;
+		if (a_Callback.Item(plugin.get()))
+		{
+			return false;
+		}
 	}
-
-	// Initialization failed
-	RemovePlugin(a_Plugin);  // Also undoes any registrations that Initialize() might have made
-	return false;
+	return true;
 }
 
 
@@ -1869,21 +1806,23 @@ bool cPluginManager::AddPlugin(cPlugin * a_Plugin)
 
 void cPluginManager::AddHook(cPlugin * a_Plugin, int a_Hook)
 {
-	if (!a_Plugin)
+	if (a_Plugin == nullptr)
 	{
 		LOGWARN("Called cPluginManager::AddHook() with a_Plugin == nullptr");
 		return;
 	}
 	PluginList & Plugins = m_Hooks[a_Hook];
-	Plugins.remove(a_Plugin);
-	Plugins.push_back(a_Plugin);
+	if (std::find(Plugins.cbegin(), Plugins.cend(), a_Plugin) == Plugins.cend())
+	{
+		Plugins.push_back(a_Plugin);
+	}
 }
 
 
 
 
 
-size_t cPluginManager::GetNumPlugins() const
+size_t cPluginManager::GetNumPlugins(void) const
 {
 	return m_Plugins.size();
 }
@@ -1891,3 +1830,53 @@ size_t cPluginManager::GetNumPlugins() const
 
 
 
+
+size_t cPluginManager::GetNumLoadedPlugins(void) const
+{
+	size_t res = 0;
+	for (auto & plugin: m_Plugins)
+	{
+		if (plugin->IsLoaded())
+		{
+			res += 1;
+		}
+	}
+	return res;
+}
+
+
+
+
+
+AStringVector cPluginManager::GetFoldersToLoad(cIniFile & a_SettingsIni)
+{
+	// Check if the Plugins section exists.
+	int KeyNum = a_SettingsIni.FindKey("Plugins");
+	if (KeyNum == -1)
+	{
+		InsertDefaultPlugins(a_SettingsIni);
+		KeyNum = a_SettingsIni.FindKey("Plugins");
+	}
+
+	// Get the list of plugins to load:
+	AStringVector res;
+	int NumPlugins = a_SettingsIni.GetNumValues(KeyNum);
+	for (int i = 0; i < NumPlugins; i++)
+	{
+		AString ValueName = a_SettingsIni.GetValueName(KeyNum, i);
+		if (ValueName.compare("Plugin") == 0)
+		{
+			AString PluginFile = a_SettingsIni.GetValue(KeyNum, i);
+			if (!PluginFile.empty())
+			{
+				res.push_back(PluginFile);
+			}
+		}
+	}  // for i - ini values
+
+	return res;
+}
+
+
+
+
diff --git a/src/Bindings/PluginManager.h b/src/Bindings/PluginManager.h
index be6ff021a..f32feb8a3 100644
--- a/src/Bindings/PluginManager.h
+++ b/src/Bindings/PluginManager.h
@@ -6,48 +6,30 @@
 
 
 
-class cPlugin;
 
-// fwd: World.h
-class cWorld;
 
-// fwd: ChunkDesc.h
+// fwd:
+class cBlockEntityWithItems;
 class cChunkDesc;
-
-// fwd: Entities/Entity.h
-class cEntity;
-
-// fwd: Entities/ProjectileEntity.h
-class cProjectileEntity;
-
-// fwd: Mobs/Monster.h
-class cMonster;
-
-// fwd: Player.h
-class cPlayer;
-
-// fwd: CraftingRecipes.h
+class cClientHandle;
+class cCommandOutputCallback;
 class cCraftingGrid;
 class cCraftingRecipe;
-
-// fwd: Pickup.h
+class cEntity;
+class cHopperEntity;
+class cItems;
+class cMonster;
 class cPickup;
-
-// fwd: Pawn.h
+class cPlayer;
+class cPlugin;
+class cProjectileEntity;
+class cWorld;
 struct TakeDamageInfo;
 
-// fwd: CommandOutput.h
-class cCommandOutputCallback;
+typedef SharedPtr<cPlugin> cPluginPtr;
+typedef std::vector<cPluginPtr> cPluginPtrs;
 
-// fwd: BlockEntities/HopperEntity.h
-class cHopperEntity;
 
-// fwd: BlockEntities/BlockEntityWithItems.h
-class cBlockEntityWithItems;
-
-
-
-class cItems;
 
 
 
@@ -55,12 +37,7 @@ class cItems;
 class cPluginManager
 {
 public:
-	// tolua_end
-	
-	// Called each tick
-	virtual void Tick(float a_Dt);
-	
-	// tolua_begin
+
 	enum CommandResult
 	{
 		crExecuted,
@@ -70,6 +47,29 @@ public:
 		crNoPermission,
 	} ;
 
+
+	/** Defines the status of a single plugin - whether it is loaded, disabled or errored. */
+	enum ePluginStatus
+	{
+		/** The plugin has been loaded successfully. */
+		psLoaded,
+
+		/** The plugin is disabled in settings.ini. */
+		psDisabled,
+
+		/** The plugin is enabled in settings.ini but has been unloaded (by a command). */
+		psUnloaded,
+
+		/** The plugin is enabled in settings.ini but has failed to load.
+		m_LoadError is the description of the error. */
+		psError,
+
+		/** The plugin has been loaded before, but after a folder refresh it is no longer present.
+		The plugin will be unloaded in the next call to ReloadPlugins(). */
+		psNotFound,
+	};
+
+
 	enum PluginHook
 	{
 		HOOK_BLOCK_SPREAD,
@@ -160,24 +160,31 @@ public:
 	/** The interface used for enumerating and extern-calling plugins */
 	typedef cItemCallback<cPlugin> cPluginCallback;
 	
+	typedef std::list<cPlugin *> PluginList;
+
+
+	/** Called each tick, calls the plugins' OnTick hook, as well as processes plugin events (addition, removal) */
+	void Tick(float a_Dt);
 	
 	/** Returns the instance of the Plugin Manager (there is only ever one) */
 	static cPluginManager * Get(void);  // tolua_export
 
-	typedef std::map< AString, cPlugin * > PluginMap;
-	typedef std::list< cPlugin * > PluginList;
-	cPlugin * GetPlugin( const AString & a_Plugin) const;  // tolua_export
-	const PluginMap & GetAllPlugins() const;  // >> EXPORTED IN MANUALBINDINGS <<
+	/** Refreshes the m_Plugins list based on the current contents of the Plugins folder.
+	If an active plugin's folder is not found anymore, the plugin is set as psNotFound, but not yet unloaded. */
+	void RefreshPluginList();  // tolua_export
 
-	// tolua_begin
-	void FindPlugins();
-	void ReloadPlugins();
-	// tolua_end
+	/** Schedules a reload of the plugins to happen within the next call to Tick(). */
+	void ReloadPlugins();  // tolua_export
 	
-	/** Adds the plugin to the list of plugins called for the specified hook type. Handles multiple adds as a single add */
+	/** Adds the plugin to the list of plugins called for the specified hook type.
+	If a plugin adds multiple handlers for a single hook, it is added only once (ignore-duplicates). */
 	void AddHook(cPlugin * a_Plugin, int a_HookType);
 
+	/** Returns the number of all plugins in m_Plugins (includes disabled, unloaded and errored plugins). */
 	size_t GetNumPlugins() const;  // tolua_export
+
+	/** Returns the number of plugins that are psLoaded. */
+	size_t GetNumLoadedPlugins(void) const;  // tolua_export
 	
 	// Calls for individual hooks. Each returns false if the action is to continue or true if the plugin wants to abort
 	bool CallHookBlockSpread              (cWorld & a_World, int a_BlockX, int a_BlockY, int a_BlockZ, eSpreadSource a_Source);
@@ -242,14 +249,19 @@ public:
 	bool CallHookWorldStarted             (cWorld & a_World);
 	bool CallHookWorldTick                (cWorld & a_World, std::chrono::milliseconds a_Dt, std::chrono::milliseconds a_LastTickDurationMSec);
 	
-	bool DisablePlugin(const AString & a_PluginName);  // tolua_export
-	bool LoadPlugin   (const AString & a_PluginName);  // tolua_export
+	/** Queues the specified plugin to be unloaded in the next call to Tick().
+	Note that this function returns before the plugin is unloaded, to avoid deadlocks. */
+	void UnloadPlugin(const AString & a_PluginFolder);  // tolua_export
+
+	/** Loads the plugin from the specified plugin folder.
+	Returns true if the plugin was loaded successfully or was already loaded before, false otherwise. */
+	bool LoadPlugin(const AString & a_PluginFolder);  // tolua_export
 
 	/** Removes all hooks the specified plugin has registered */
 	void RemoveHooks(cPlugin * a_Plugin);
 	
-	/** Removes the plugin from the internal structures and deletes its object. */
-	void RemovePlugin(cPlugin * a_Plugin);
+	/** Removes the plugin of the specified name from the internal structures and deletes its object. */
+	void RemovePlugin(const AString & a_PluginName);
 	
 	/** Removes all command bindings that the specified plugin has made */
 	void RemovePluginCommands(cPlugin * a_Plugin);
@@ -296,8 +308,12 @@ public:
 	static bool IsValidHookType(int a_HookType);
 	
 	/** Calls the specified callback with the plugin object of the specified plugin.
-	Returns false if plugin not found, and the value that the callback has returned otherwise. */
+	Returns false if plugin not found, otherwise returns the value that the callback has returned. */
 	bool DoWithPlugin(const AString & a_PluginName, cPluginCallback & a_Callback);
+
+	/** Calls the specified callback for each plugin in m_Plugins.
+	Returns true if all plugins have been reported, false if the callback has aborted the enumeration by returning true. */
+	bool ForEachPlugin(cPluginCallback & a_Callback);
 	
 	/** Returns the path where individual plugins' folders are expected.
 	The path doesn't end in a slash. */
@@ -317,14 +333,26 @@ private:
 	typedef std::map<int, cPluginManager::PluginList> HookMap;
 	typedef std::map<AString, cCommandReg> CommandMap;
 
-	PluginList m_DisablePluginList;
-	PluginMap  m_Plugins;
+
+	/** FolderNames of plugins that should be unloaded.
+	The plugins will be unloaded within the next call to Tick(), to avoid multithreading issues.
+	Protected against multithreaded access by m_CSPluginsToUnload. */
+	AStringVector m_PluginsToUnload;
+
+	/** Protects m_PluginsToUnload against multithreaded access. */
+	mutable cCriticalSection m_CSPluginsToUnload;
+
+	/** All plugins that have been found in the Plugins folder. */
+	cPluginPtrs m_Plugins;
+
 	HookMap    m_Hooks;
 	CommandMap m_Commands;
 	CommandMap m_ConsoleCommands;
 
+	/** If set to true, all the plugins will be reloaded within the next call to Tick(). */
 	bool m_bReloadPlugins;
 
+
 	cPluginManager();
 	virtual ~cPluginManager();
 
@@ -340,11 +368,11 @@ private:
 	/** Handles writing default plugins if 'Plugins' key not found using a cIniFile object expected to be intialised to settings.ini */
 	void InsertDefaultPlugins(cIniFile & a_SettingsIni);
 
-	/** Adds the plugin into the internal list of plugins and initializes it. If initialization fails, the plugin is removed again. */
-	bool AddPlugin(cPlugin * a_Plugin);
-
 	/** Tries to match a_Command to the internal table of commands, if a match is found, the corresponding plugin is called. Returns crExecuted if the command is executed. */
 	CommandResult HandleCommand(cPlayer & a_Player, const AString & a_Command, bool a_ShouldCheckPermissions);
+
+	/** Returns the folders that are specified in the settings ini to load plugins from. */
+	AStringVector GetFoldersToLoad(cIniFile & a_SettingsIni);
 } ;  // tolua_export
 
 
diff --git a/src/Server.cpp b/src/Server.cpp
index df2c7deef..9c5c6b6eb 100644
--- a/src/Server.cpp
+++ b/src/Server.cpp
@@ -464,22 +464,11 @@ void cServer::ExecuteConsoleCommand(const AString & a_Cmd, cCommandOutputCallbac
 	{
 		if (split.size() > 1)
 		{
-			cPluginManager::PluginMap map = cPluginManager::Get()->GetAllPlugins();
-
-			for (auto plugin_entry : map)
-			{
-				if (plugin_entry.first == split[1])
-				{
-					a_Output.Out("Error! Plugin is already loaded!");
-					a_Output.Finished();
-					return;
-				}
-			}
 			a_Output.Out(cPluginManager::Get()->LoadPlugin(split[1]) ? "Plugin loaded" : "Error occurred loading plugin");
 		}
 		else
 		{
-			a_Output.Out("Usage: load <pluginname>");
+			a_Output.Out("Usage: load <PluginFolder>");
 		}
 		a_Output.Finished();
 		return;
@@ -488,12 +477,12 @@ void cServer::ExecuteConsoleCommand(const AString & a_Cmd, cCommandOutputCallbac
 	{
 		if (split.size() > 1)
 		{
-			cPluginManager::Get()->RemovePlugin(cPluginManager::Get()->GetPlugin(split[1]));
-			a_Output.Out("Plugin unloaded");
+			cPluginManager::Get()->UnloadPlugin(split[1]);
+			a_Output.Out("Plugin unload scheduled");
 		}
 		else
 		{
-			a_Output.Out("Usage: unload <pluginname>");
+			a_Output.Out("Usage: unload <PluginFolder>");
 		}
 		a_Output.Finished();
 		return;
diff --git a/src/WebAdmin.cpp b/src/WebAdmin.cpp
index 13cf3cc41..ec265ea5b 100644
--- a/src/WebAdmin.cpp
+++ b/src/WebAdmin.cpp
@@ -489,20 +489,32 @@ AString cWebAdmin::GetDefaultPage(void)
 	Content += "<h4>Server Name:</h4>";
 	Content += "<p>" + AString( cRoot::Get()->GetServer()->GetServerID()) + "</p>";
 
+	// Display a list of all plugins:
 	Content += "<h4>Plugins:</h4><ul>";
-	cPluginManager * PM = cPluginManager::Get();
-	const cPluginManager::PluginMap & List = PM->GetAllPlugins();
-	for (cPluginManager::PluginMap::const_iterator itr = List.begin(); itr != List.end(); ++itr)
+	struct cPluginCallback:
+		public cPluginManager::cPluginCallback
 	{
-		if (itr->second == nullptr)
+		AString & m_Content;
+
+		cPluginCallback(AString & a_Content):
+			m_Content(a_Content)
 		{
-			continue;
 		}
-		AppendPrintf(Content, "<li>%s V.%i</li>", itr->second->GetName().c_str(), itr->second->GetVersion());
-	}
+
+		virtual bool Item(cPlugin * a_Plugin) override
+		{
+			if (a_Plugin->IsLoaded())
+			{
+				AppendPrintf(m_Content, "<li>%s V.%i</li>", a_Plugin->GetName().c_str(), a_Plugin->GetVersion());
+			}
+			return false;
+		}
+	} Callback(Content);
+	cPluginManager::Get()->ForEachPlugin(Callback);
 	Content += "</ul>";
-	Content += "<h4>Players:</h4><ul>";
 
+	// Display a list of all players:
+	Content += "<h4>Players:</h4><ul>";
 	cPlayerAccum PlayerAccum;
 	cWorld * World = cRoot::Get()->GetDefaultWorld();  // TODO - Create a list of worlds and players
 	if (World != nullptr)