Add guessing game formspec example

7_formspecs/guessing/init.lua

@@ -0,0 +1,63 @@
+guessing = {}
+
+local _contexts = {}
+
+minetest.register_on_leaveplayer(function(player)
+	_contexts[player:get_player_name()] = nil
+end)
+
+local function get_context(name)
+	local context = _contexts[name] or {}
+	_contexts[name] = context
+	return context
+end
+
+function guessing.get_formspec(name)
+	local context = get_context(name)
+	context.target = context.target or math.random(1, 10)
+
+	local text
+	if not context.guess then
+		text = "I'm thinking of a number... Make a guess!"
+	elseif context.guess == context.target then
+		text = "Hurray, you got it!"
+	elseif context.guess > context.target then
+		text = "To high!"
+	else
+		text = "To low!"
+	end
+
+	local formspec = {
+		"size[6,3.476]",
+		"real_coordinates[true]",
+		"label[0.375,0.5;", minetest.formspec_escape(text), "]",
+		"field[0.375,1.25;5.25,0.8;number;Number;]",
+		"button[1.5,2.3;3,0.8;guess;Guess]"
+	}
+
+	-- table.concat is faster than ..
+	return table.concat(formspec, "")
+end
+
+function guessing.show_to(name)
+	minetest.show_formspec(name, "guessing:game", guessing.get_formspec(name))
+end
+
+minetest.register_chatcommand("game", {
+	func = function(name)
+		guessing.show_to(name)
+	end,
+})
+
+minetest.register_on_player_receive_fields(function(player, formname, fields)
+	if formname ~= "guessing:game" then
+		return
+	end
+
+	if fields.guess then
+		local name = player:get_player_name()
+		local context = get_context(name)
+		context.guess = tonumber(fields.number)
+		guessing.show_to(name)
+	end
+end)