Add SFINV support

mod.conf

@@ -1,3 +1,3 @@
 name = quests
-optional_depends = intllib, unified_inventory, inventory_plus, central_message
-description = Quest framework for Minetest.
+optional_depends = intllib, unified_inventory, inventory_plus, central_message, sfinv
+description = Quest framework for Minetest.

mod_integrations/mod_integrations.lua

@@ -7,8 +7,11 @@ if minetest.get_modpath("inventory_plus") then
 	dofile(minetest.get_modpath("quests") .. "/mod_integrations/inventory_plus.lua")
 end
 
+if minetest.global_exists("sfinv") then
+	dofile(minetest.get_modpath("quests") .. "/mod_integrations/sfinv.lua")
+end
 
---mod that displays notifications in the screen's center
+-- mod that displays notifications in the screen's center
 if minetest.get_modpath("central_message") then
 	dofile(minetest.get_modpath("quests") .. "/mod_integrations/central_message.lua")
 

mod_integrations/sfinv.lua

@@ -0,0 +1,19 @@
+assert(sfinv.enabled, "Please enable sfinv in order to use it.")
+local old_func = sfinv.pages["sfinv:crafting"].get
+sfinv.override_page("sfinv:crafting", {
+	get = function(self, player, context)
+		local fs = old_func(self, player, context)
+		return fs .. "image_button[0,0;1,1;inventory_plus_quests.png;quests;]"
+	end
+})
+
+minetest.register_on_player_receive_fields(function(player, formname, fields)
+	if fields.quests then
+		quests.show_formspec(player:get_player_name())
+		return true
+	elseif fields.quests_exit then
+		sfinv.set_page(player, "sfinv:crafting")
+		return true
+	end
+	return false
+end)