Replace C++ mainmenu by formspec powered one

builtin/mainmenu_helper.lua

@@ -0,0 +1,105 @@
+--------------------------------------------------------------------------------
+function dump(o, dumped)
+	dumped = dumped or {}
+	if type(o) == "number" then
+		return tostring(o)
+	elseif type(o) == "string" then
+		return string.format("%q", o)
+	elseif type(o) == "table" then
+		if dumped[o] then
+			return "<circular reference>"
+		end
+		dumped[o] = true
+		local t = {}
+		for k,v in pairs(o) do
+			t[#t+1] = "" .. k .. " = " .. dump(v, dumped)
+		end
+		return "{" .. table.concat(t, ", ") .. "}"
+	elseif type(o) == "boolean" then
+		return tostring(o)
+	elseif type(o) == "function" then
+		return "<function>"
+	elseif type(o) == "userdata" then
+		return "<userdata>"
+	elseif type(o) == "nil" then
+		return "nil"
+	else
+		error("cannot dump a " .. type(o))
+		return nil
+	end
+end
+
+--------------------------------------------------------------------------------
+function string:split(sep)
+	local sep, fields = sep or ",", {}
+	local pattern = string.format("([^%s]+)", sep)
+	self:gsub(pattern, function(c) fields[#fields+1] = c end)
+	return fields
+end
+
+--------------------------------------------------------------------------------
+function string:trim()
+	return (self:gsub("^%s*(.-)%s*$", "%1"))
+end
+
+--------------------------------------------------------------------------------
+engine.get_game = function(index)
+	local games = game.get_games()
+	
+	if index > 0 and index <= #games then
+		return games[index]
+	end
+	
+	return nil
+end
+
+--------------------------------------------------------------------------------
+function fs_escape_string(text)
+	if text ~= nil then
+		while (text:find("\r\n") ~= nil) do
+			local newtext = text:sub(1,text:find("\r\n")-1)
+			newtext = newtext .. " " .. text:sub(text:find("\r\n")+3)
+			
+			text = newtext
+		end
+		
+		while (text:find("\n") ~= nil) do
+			local newtext = text:sub(1,text:find("\n")-1)
+			newtext = newtext .. " " .. text:sub(text:find("\n")+1)
+			
+			text = newtext
+		end
+		
+		while (text:find("\r") ~= nil) do
+			local newtext = text:sub(1,text:find("\r")-1)
+			newtext = newtext .. " " .. text:sub(text:find("\r")+1)
+			
+			text = newtext
+		end
+		
+		text = text:gsub("%[","%[%[")
+		text = text:gsub("]","]]")
+		text = text:gsub(";"," ")
+	end
+	return text
+end
+
+--------------------------------------------------------------------------------
+function explode_textlist_event(text)
+	
+	local retval = {}
+	retval.typ = "INV"
+	
+	local parts = text:split(":")
+				
+	if #parts == 2 then
+		retval.typ = parts[1]:trim()
+		retval.index= tonumber(parts[2]:trim())
+		
+		if type(retval.index) ~= "number" then
+			retval.typ = "INV"
+		end
+	end
+	
+	return retval
+end