Basic support for configuring which mods to load for each world

settings.h: added function to return all keys used in settings, and a
function to remove a setting

mods.{h,cpp}: added class ModConfiguration that represents a subset of the installed mods.

server.{h,cpp}: server does not load add-on mods that are disabled in
the world.mt file. mods are disabled by a setting of the form
"load_mod_<modname> = false". if no load_mod_<modname> = ... setting
is found, the mod is loaded anyways for backwards compatibilty. server
also complains to errorstream about mods with unstatisfied
dependencies and about mods that are not installed.

guiConfigureWorld.{h,cpp}: shows a treeview of installed add-on mods
and modpacks with little icons in front of their name indicating their
status: a checkmark for enabled mods, a cross for disabled mods, a
question mark for "new" mods

Mods can be enabled/disabled by a checkbox. Mods also show a list of
dependencies and reverse dependencies. double-click on a mod in
dependency or reverse dependency listbox selects the corresponding
mod. Enabling a mod also enables all its dependencies. Disabling a mod
also disables all its reverse dependencies.

For modpacks, show buttons to enable/disable all mods (recursively,
including their dependencies) in it.

Button "Save" saves the current settings to the world.mt file and
returns to the main menu. Button "Cancel" returns to main menu without
saving.

basic keyboard controls (if the proper widget has keyboard focus):

up/down: scroll through tree of mods
left/right: collaps/expand a modpack
space: enable/disable the selected mod

1 files changed, 668 insertions, 0 deletions

diff --git a/src/guiConfigureWorld.cpp b/src/guiConfigureWorld.cpp
new file mode 100644
index 000000000..a77697f8b
--- /dev/null
+++ b/src/guiConfigureWorld.cpp
@@ -0,0 +1,668 @@
+/*
+Minetest-c55
+Copyright (C) 2012 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+
+#include <iostream> 
+#include <string>
+#include <map>
+
+#include "guiConfigureWorld.h"
+#include "guiMessageMenu.h"
+#include <IGUIButton.h>
+#include <IGUICheckBox.h>
+#include <IGUIListBox.h>
+#include <IGUIStaticText.h>
+#include <IGUITreeView.h>
+#include "gettext.h"
+#include "util/string.h"
+#include "settings.h"
+#include "filesys.h"
+
+enum
+{
+	GUI_ID_MOD_TREEVIEW = 101,
+	GUI_ID_ENABLED_CHECKBOX,
+	GUI_ID_ENABLEALL,
+	GUI_ID_DISABLEALL,
+	GUI_ID_DEPENDS_LISTBOX,
+	GUI_ID_RDEPENDS_LISTBOX,
+	GUI_ID_CANCEL,
+	GUI_ID_SAVE
+};
+
+#define QUESTIONMARK_STR L"?"
+#define CHECKMARK_STR    L"\411"
+#define CROSS_STR        L"\403"
+
+GUIConfigureWorld::GUIConfigureWorld(gui::IGUIEnvironment* env,
+		gui::IGUIElement* parent, s32 id,
+		IMenuManager *menumgr, WorldSpec wspec):
+	GUIModalMenu(env, parent, id, menumgr),
+	m_wspec(wspec),
+	m_gspec(findWorldSubgame(m_wspec.path)),
+	m_menumgr(menumgr)
+{
+	//will be initialized in regenerateGUI()
+	m_treeview=NULL;
+
+	// game mods
+	m_gamemods = flattenModTree(getModsInPath(m_gspec.gamemods_path));
+
+	// world mods
+	std::string worldmods_path = wspec.path + DIR_DELIM + "worldmods";
+	m_worldmods = flattenModTree(getModsInPath(worldmods_path));
+
+	// fill m_addontree with add-on mods
+	ModSpec addons("Add-Ons");
+	std::set<std::string> paths = m_gspec.addon_mods_paths;
+	for(std::set<std::string>::iterator it=paths.begin();
+		it != paths.end(); ++it)
+	{
+		std::map<std::string,ModSpec> mods = getModsInPath(*it);
+		addons.modpack_content.insert(mods.begin(), mods.end());
+	}
+	m_addontree.insert(std::make_pair(addons.name,addons));
+
+	// expand modpacks
+	m_addonmods = flattenModTree(m_addontree);
+
+	// collect reverse dependencies
+	for(std::map<std::string, ModSpec>::iterator it = m_addonmods.begin();
+		it != m_addonmods.end(); ++it)
+	{
+		std::string modname = (*it).first;
+		ModSpec mod = (*it).second;
+		for(std::set<std::string>::iterator dep_it = mod.depends.begin();
+			dep_it != mod.depends.end(); ++dep_it)
+		{
+			m_reverse_depends.insert(std::make_pair((*dep_it),modname));
+		}
+	}
+
+	m_settings.readConfigFile((m_wspec.path + DIR_DELIM + "world.mt").c_str());
+	std::vector<std::string> names = m_settings.getNames();
+
+	// mod_names contains the names of mods mentioned in the world.mt file
+	std::set<std::string> mod_names;
+	for(std::vector<std::string>::iterator it = names.begin(); 
+		it != names.end(); ++it)
+	{	
+		std::string name = *it;  
+		if (name.compare(0,9,"load_mod_")==0)
+			mod_names.insert(name.substr(9));
+	}
+
+	// find new mods (installed but not mentioned in world.mt)
+	for(std::map<std::string, ModSpec>::iterator it = m_addonmods.begin();
+		it != m_addonmods.end(); ++it)
+	{
+		std::string modname = (*it).first;
+		ModSpec mod = (*it).second;
+		// a mod is new if it is not a modpack, and does not occur in
+		// mod_names
+		if(mod.modpack_content.empty() &&
+		   mod_names.count(modname) == 0)
+			m_new_mod_names.insert(modname);
+	}
+	if(!m_new_mod_names.empty())
+	{
+		GUIMessageMenu *menu = 
+			new GUIMessageMenu(Environment, Parent, -1, m_menumgr, 
+							   wgettext("Warning: Some mods are not configured yet.\n" 
+										"They will be enabled by default when you save the configuration.  ")); 
+		menu->drop();
+	}
+	
+
+	// find missing mods (mentioned in world.mt, but not installed)
+	std::set<std::string> missing_mods;
+	for(std::set<std::string>::iterator it = mod_names.begin();
+		it != mod_names.end(); ++it)
+	{
+		std::string modname = *it;
+		if(m_addonmods.count(modname) == 0)
+			missing_mods.insert(modname);
+	}
+	if(!missing_mods.empty())
+	{
+		GUIMessageMenu *menu = 
+			new GUIMessageMenu(Environment, Parent, -1, m_menumgr, 
+							   wgettext("Warning: Some configured mods are missing.\n"
+										"Their setting will be removed when you save the configuration.  ")); 
+		for(std::set<std::string>::iterator it = missing_mods.begin();
+			it != missing_mods.end(); ++it)
+			m_settings.remove("load_mod_"+(*it));
+		menu->drop();
+	}	
+}
+
+void GUIConfigureWorld::drawMenu()
+{
+	gui::IGUISkin* skin = Environment->getSkin();
+	if (!skin)
+		return;
+	video::IVideoDriver* driver = Environment->getVideoDriver();
+	
+	video::SColor bgcolor(140,0,0,0);
+	driver->draw2DRectangle(bgcolor, AbsoluteRect, &AbsoluteClippingRect);
+
+	gui::IGUIElement::draw();
+}
+
+
+void GUIConfigureWorld::regenerateGui(v2u32 screensize)
+{
+
+	/*
+		Remove stuff
+	*/
+	removeChildren();
+	
+	/*
+		Calculate new sizes and positions
+	*/
+	core::rect<s32> rect(
+			screensize.X/2 - 580/2,
+			screensize.Y/2 - 300/2,
+			screensize.X/2 + 580/2,
+			screensize.Y/2 + 300/2
+	);
+	
+	DesiredRect = rect;
+	recalculateAbsolutePosition(false);
+
+	v2s32 size = rect.getSize();
+
+	v2s32 topleft = v2s32(10, 10);
+
+	/*
+		Add stuff
+	*/
+	changeCtype("");
+	{
+		core::rect<s32> rect(0, 0, 200, 20);
+		rect += topleft;
+		//proper text is set below, when a mod is selected
+		m_modname_text = Environment->addStaticText(L"Mod: N/A", rect, false, 
+													false, this, -1);
+	}
+	{
+		core::rect<s32> rect(0, 0, 200, 20);
+		rect += v2s32(0, 25) + topleft;
+		m_enabled_checkbox = 
+			Environment->addCheckBox(false, rect, this, GUI_ID_ENABLED_CHECKBOX, 
+									 wgettext("enabled"));
+		m_enabled_checkbox->setVisible(false);
+	}
+	{
+		core::rect<s32> rect(0, 0, 85, 30);
+		rect = rect + v2s32(0, 25) + topleft;
+		m_enableall = Environment->addButton(rect, this, GUI_ID_ENABLEALL,
+											 wgettext("Enable All"));
+		m_enableall->setVisible(false);
+	}
+	{
+		core::rect<s32> rect(0, 0, 85, 30);
+		rect = rect + v2s32(115, 25) + topleft;
+		m_disableall = Environment->addButton(rect, this, GUI_ID_DISABLEALL,
+											  wgettext("Disable All"));
+		m_disableall->setVisible(false);
+	}
+	{
+		core::rect<s32> rect(0, 0, 200, 20);
+		rect += v2s32(0, 60) + topleft;
+		Environment->addStaticText(wgettext("depends on:"),
+			rect, false, false, this, -1);
+	}
+	{
+		core::rect<s32> rect(0, 0, 200, 85);
+		rect += v2s32(0, 80) + topleft;
+		m_dependencies_listbox = 
+			Environment->addListBox(rect, this, GUI_ID_DEPENDS_LISTBOX, true);
+	}
+	{
+		core::rect<s32> rect(0, 0, 200, 20);
+		rect += v2s32(0, 175) + topleft;
+		Environment->addStaticText(wgettext("is required by:"),
+					rect, false, false, this, -1);
+	}
+	{
+		core::rect<s32> rect(0, 0, 200, 85);
+		rect += v2s32(0, 195) + topleft;
+		m_rdependencies_listbox = 
+			Environment->addListBox(rect,this, GUI_ID_RDEPENDS_LISTBOX,true);
+	}
+	{
+		core::rect<s32> rect(0, 0, 340, 250);
+		rect += v2s32(220, 0) + topleft;
+		m_treeview = Environment->addTreeView(rect, this,
+											  GUI_ID_MOD_TREEVIEW,true);
+		buildTreeView(m_addontree, m_treeview->getRoot());
+	}
+	{
+		core::rect<s32> rect(0, 0, 120, 30);
+		rect = rect + v2s32(330, 270) - topleft;
+		Environment->addButton(rect, this, GUI_ID_CANCEL,
+			wgettext("Cancel"));
+	}
+	{
+		core::rect<s32> rect(0, 0, 120, 30);
+		rect = rect + v2s32(460, 270) - topleft;
+		Environment->addButton(rect, this, GUI_ID_SAVE,
+			wgettext("Save"));
+	}
+	changeCtype("C");
+
+	// at start, none of the treeview nodes is selected, so we select
+	// the first element in the treeview of mods manually here.
+	if(m_treeview->getRoot()->hasChilds())
+	{
+		m_treeview->getRoot()->getFirstChild()->setExpanded(true);
+		m_treeview->getRoot()->getFirstChild()->setSelected(true);
+		// Because a manual ->setSelected() doesn't cause an event, we
+		// have to do this here:
+		adjustSidebar();
+	}
+}
+
+bool GUIConfigureWorld::OnEvent(const SEvent& event)
+{
+
+	gui::IGUITreeViewNode* selected_node = NULL;
+	if(m_treeview != NULL)
+		selected_node = m_treeview->getSelected();
+
+	if(event.EventType==EET_KEY_INPUT_EVENT && event.KeyInput.PressedDown)
+	{
+		switch (event.KeyInput.Key) {
+		case KEY_ESCAPE: {
+			quitMenu();
+			return true;
+		}
+		//	irrlicht's built-in TreeView gui has no keyboard control,
+		//	so we do it here: up/down to select prev/next node,
+		//	left/right to collapse/expand nodes, space to toggle
+		//	enabled/disabled.
+		case KEY_DOWN: {
+			if(selected_node != NULL)
+			{
+				gui::IGUITreeViewNode* node = selected_node->getNextVisible();
+				if(node != NULL)
+				{
+					node->setSelected(true);
+					adjustSidebar();
+				}
+			}
+			return true;
+		}
+		case KEY_UP: {
+			if(selected_node != NULL)
+			{
+				gui::IGUITreeViewNode* node = selected_node->getPrevSibling();
+				if(node!=NULL)
+				{
+					node->setSelected(true);
+					adjustSidebar();
+				}
+				else 
+				{
+					gui::IGUITreeViewNode* parent = selected_node->getParent();
+					if(selected_node == parent->getFirstChild() &&
+					   parent != m_treeview->getRoot()) 
+					{
+						parent->setSelected(true);
+						adjustSidebar();
+					}
+				}
+			}
+			return true;
+		}
+		case KEY_RIGHT: {
+			if(selected_node != NULL && selected_node->hasChilds())
+				selected_node->setExpanded(true);
+			return true;
+		}
+		case KEY_LEFT: {
+			if(selected_node != NULL && selected_node->hasChilds())
+				selected_node->setExpanded(false);
+			return true;
+		}
+		case KEY_SPACE: {
+			if(selected_node != NULL && !selected_node->hasChilds() && 
+			   selected_node->getText() != NULL)
+			{
+				std::string modname = wide_to_narrow(selected_node->getText());
+				bool checked = m_enabled_checkbox->isChecked();
+				m_enabled_checkbox->setChecked(!checked);
+				setEnabled(modname,!checked);
+			}
+			return true;
+		}
+		default: {}
+		}
+	}
+	if(event.EventType==EET_GUI_EVENT)
+	{
+		if(event.GUIEvent.EventType==gui::EGET_ELEMENT_FOCUS_LOST
+				&& isVisible())
+		{
+			if(!canTakeFocus(event.GUIEvent.Element))
+			{
+				dstream<<"GUIConfigureWorld: Not allowing focus change."
+						<<std::endl;
+				// Returning true disables focus change
+				return true;
+			}
+		}
+		if(event.GUIEvent.EventType==gui::EGET_BUTTON_CLICKED){
+			switch(event.GUIEvent.Caller->getID()){
+			case GUI_ID_CANCEL: {
+				quitMenu();
+				return true;
+			}
+			case GUI_ID_SAVE: {
+				for(std::set<std::string>::iterator it = m_new_mod_names.begin();
+					it!= m_new_mod_names.end(); ++it)
+				{
+					m_settings.setBool("load_mod_"+(*it),true);
+				}
+				std::string worldmtfile = m_wspec.path+DIR_DELIM+"world.mt";
+				m_settings.updateConfigFile(worldmtfile.c_str());
+
+				// The trailing spaces are because there seems to be a
+				// bug in the text-size calculation. if the trailing
+				// spaces are removed from the message text, the
+				// message gets wrapped and parts of it are cut off:
+				GUIMessageMenu *menu = 
+					new GUIMessageMenu(Environment, Parent, -1, m_menumgr, 
+									   wgettext("Configuration saved.  "));
+				menu->drop();
+
+				ModConfiguration modconf(m_wspec.path);
+				if(!modconf.isConsistent())
+				{
+					GUIMessageMenu *menu = 
+						new GUIMessageMenu(Environment, Parent, -1, m_menumgr, 
+										   wgettext("Warning: Configuration not consistent.  "));
+					menu->drop();
+				}
+
+				quitMenu();	
+				return true;
+			}
+			case GUI_ID_ENABLEALL: {
+				if(selected_node != NULL && selected_node->getText() != NULL)
+				{
+					std::string modname = wide_to_narrow(selected_node->getText());
+					ModSpec mod = m_addonmods[modname];
+					enableAllMods(mod.modpack_content,true);
+				}
+				return true;
+			}
+			case GUI_ID_DISABLEALL: {
+				if(selected_node != NULL && selected_node->getText() != NULL)
+				{
+					std::string modname = wide_to_narrow(selected_node->getText());
+					ModSpec mod = m_addonmods[modname];
+					enableAllMods(mod.modpack_content,false);
+				}
+				return true;
+			}
+			}
+		}	
+		if(event.GUIEvent.EventType==gui::EGET_CHECKBOX_CHANGED &&
+			event.GUIEvent.Caller->getID() == GUI_ID_ENABLED_CHECKBOX)
+		{
+			if(selected_node != NULL && !selected_node->hasChilds() && 
+			   selected_node->getText() != NULL)
+			{
+				std::string modname = wide_to_narrow(selected_node->getText());
+				setEnabled(modname, m_enabled_checkbox->isChecked());
+			}
+			return true;
+		}
+		if(event.GUIEvent.EventType==gui::EGET_TREEVIEW_NODE_SELECT &&
+			event.GUIEvent.Caller->getID() == GUI_ID_MOD_TREEVIEW)
+		{
+			selecting_dep = -1;
+			selecting_rdep = -1;
+			adjustSidebar();
+			return true;
+		}
+		if(event.GUIEvent.EventType==gui::EGET_LISTBOX_CHANGED &&
+		   event.GUIEvent.Caller->getID() == GUI_ID_DEPENDS_LISTBOX)
+		{
+			selecting_dep = m_dependencies_listbox->getSelected();
+			selecting_rdep = -1;
+			return true;
+		}
+		if(event.GUIEvent.EventType==gui::EGET_LISTBOX_CHANGED &&
+		   event.GUIEvent.Caller->getID() == GUI_ID_RDEPENDS_LISTBOX)
+		{
+			selecting_dep = -1;
+			selecting_rdep = m_rdependencies_listbox->getSelected();
+			return true;
+		}
+
+		//double click in a dependency listbox: find corresponding
+		//treeviewnode and select it:
+		if(event.GUIEvent.EventType==gui::EGET_LISTBOX_SELECTED_AGAIN)
+		{
+			gui::IGUIListBox* box = NULL;
+			if(event.GUIEvent.Caller->getID() == GUI_ID_DEPENDS_LISTBOX)
+			{
+				box = m_dependencies_listbox;
+				if(box->getSelected() != selecting_dep)
+					return true;
+			}
+			if(event.GUIEvent.Caller->getID() == GUI_ID_RDEPENDS_LISTBOX)
+			{
+				box = m_rdependencies_listbox;
+				if(box->getSelected() != selecting_rdep)
+					return true;
+			}
+			if(box != NULL && box->getSelected() != -1 &&
+			   box->getListItem(box->getSelected()) != NULL)
+			{
+				std::string modname = 
+					wide_to_narrow(box->getListItem(box->getSelected()));
+				std::map<std::string, gui::IGUITreeViewNode*>::iterator it =
+					m_nodes.find(modname);
+				if(it != m_nodes.end())
+				{
+					// select node and make sure node is visible by
+					// expanding all parents
+					gui::IGUITreeViewNode* node = (*it).second;
+					node->setSelected(true);
+					while(!node->isVisible() && 
+						  node->getParent() != m_treeview->getRoot())
+					{
+						node = node->getParent();
+						node->setExpanded(true);
+					}
+					adjustSidebar();
+				}
+			}
+			return true;
+		}
+	}
+
+	return Parent ? Parent->OnEvent(event) : false;
+}
+
+void GUIConfigureWorld::buildTreeView(std::map<std::string, ModSpec> mods, 
+									  gui::IGUITreeViewNode* node)
+{
+	for(std::map<std::string,ModSpec>::iterator it = mods.begin();
+		it != mods.end(); ++it)    
+	{
+		std::string modname = (*it).first;
+		ModSpec mod = (*it).second;
+		gui::IGUITreeViewNode* new_node = 
+			node->addChildBack(narrow_to_wide(modname).c_str());
+		m_nodes.insert(std::make_pair(modname, new_node));
+		if(!mod.modpack_content.empty())
+			buildTreeView(mod.modpack_content, new_node);
+		else
+		{
+			// set icon for node: ? for new mods, x for disabled mods,
+			// checkmark for enabled mods
+			if(m_new_mod_names.count(modname) > 0)
+			{
+				new_node->setIcon(QUESTIONMARK_STR);
+			}
+			else
+			{
+				bool mod_enabled = true;
+				if(m_settings.exists("load_mod_"+modname))
+					mod_enabled = m_settings.getBool("load_mod_"+modname);
+				if(mod_enabled)
+					new_node->setIcon(CHECKMARK_STR);
+				else 
+					new_node->setIcon(CROSS_STR);
+			}
+		}
+	}
+}
+
+
+void GUIConfigureWorld::adjustSidebar()
+{
+	gui::IGUITreeViewNode* node = m_treeview->getSelected();
+	std::wstring modname_w;
+	if(node->getText() != NULL)
+		modname_w = node->getText();
+	else 
+		modname_w = L"N/A";
+	std::string modname = wide_to_narrow(modname_w);
+
+	// if modpack, show enable/disable all buttons. otherwise, show
+	// enabled checkbox
+	if(node->hasChilds())
+	{
+		m_enabled_checkbox->setVisible(false);
+		m_disableall->setVisible(true);
+		m_enableall->setVisible(true);
+		m_modname_text->setText((L"Modpack: "+modname_w).c_str());
+	}	
+	else	
+	{
+		m_disableall->setVisible(false);
+		m_enableall->setVisible(false);
+		m_enabled_checkbox->setVisible(true);
+		m_modname_text->setText((L"Mod: "+modname_w).c_str());
+	}
+
+	// the mod is enabled unless it is disabled in the world.mt settings. 
+	bool mod_enabled = true;
+	if(m_settings.exists("load_mod_"+modname))
+		mod_enabled = m_settings.getBool("load_mod_"+modname);
+	m_enabled_checkbox->setChecked(mod_enabled);
+
+	// dependencies of this mod:
+	m_dependencies_listbox->clear();
+	ModSpec mspec = m_addonmods[modname];
+	for(std::set<std::string>::iterator it=mspec.depends.begin();
+		it != mspec.depends.end(); ++it)
+	{
+		// check if it is an add-on mod or a game/world mod. We only
+		// want to show add-ons
+		std::string dependency = (*it);
+		if(m_gamemods.count(dependency) > 0)
+			dependency += " (" + m_gspec.id + ")";
+		else if(m_worldmods.count(dependency) > 0)
+			dependency += " (" + m_wspec.name + ")";
+		else if(m_addonmods.count(dependency) == 0)
+			dependency += " (missing)";
+		m_dependencies_listbox->addItem(narrow_to_wide(dependency).c_str());
+	}
+
+
+	// reverse dependencies of this mod:
+	m_rdependencies_listbox->clear();
+	std::pair< std::multimap<std::string, std::string>::iterator, 
+			std::multimap<std::string, std::string>::iterator > rdep = 
+		m_reverse_depends.equal_range(modname);
+	for(std::multimap<std::string,std::string>::iterator it = rdep.first;
+		it != rdep.second; ++it)
+	{
+		// check if it is an add-on mod or a game/world mod. We only
+		// want to show add-ons
+		std::string rdependency = (*it).second;
+		if(m_addonmods.count(rdependency) > 0)
+			m_rdependencies_listbox->addItem(narrow_to_wide(rdependency).c_str());
+	}
+}
+
+void GUIConfigureWorld::enableAllMods(std::map<std::string, ModSpec> mods,bool enable)
+{
+	for(std::map<std::string, ModSpec>::iterator it = mods.begin();
+		it != mods.end(); ++it)
+	{
+		ModSpec mod = (*it).second;
+		if(!mod.modpack_content.empty()) 
+			// a modpack, recursively enable all mods in it
+			enableAllMods(mod.modpack_content,enable);
+		else // not a modpack
+			setEnabled(mod.name, enable);
+	}
+}
+
+void GUIConfigureWorld::enableMod(std::string modname)
+{
+	m_settings.setBool("load_mod_"+modname,true);
+	std::map<std::string,gui::IGUITreeViewNode*>::iterator it = 
+		m_nodes.find(modname);
+ 	if(it != m_nodes.end())
+		(*it).second->setIcon(CHECKMARK_STR);
+	m_new_mod_names.erase(modname);
+	//also enable all dependencies
+	ModSpec mspec = m_addonmods[modname];
+	for(std::set<std::string>::iterator it=mspec.depends.begin();
+		it != mspec.depends.end(); ++it)
+	{
+		std::string dependency = *it;
+		// only enable it if it is an add-on mod
+		if(m_addonmods.count(dependency) > 0)
+			enableMod(dependency);
+	}
+}
+
+void GUIConfigureWorld::disableMod(std::string modname)
+{
+	m_settings.setBool("load_mod_"+modname,false);
+	std::map<std::string,gui::IGUITreeViewNode*>::iterator it = 
+		m_nodes.find(modname);
+ 	if(it != m_nodes.end())
+		(*it).second->setIcon(CROSS_STR);
+	m_new_mod_names.erase(modname);
+	//also disable all mods that depend on this one
+	std::pair<std::multimap<std::string, std::string>::iterator, 
+			  std::multimap<std::string, std::string>::iterator > rdep = 
+		m_reverse_depends.equal_range(modname);
+	for(std::multimap<std::string,std::string>::iterator it = rdep.first;
+		it != rdep.second; ++it)
+	{
+		std::string rdependency = (*it).second;
+		// only disable it if it is an add-on mod
+		if(m_addonmods.count(rdependency) > 0)
+			disableMod(rdependency);
+	}	
+}
+