Progressive mode: Remember discovered recipes

README.md

@@ -6,10 +6,10 @@
 This crafting guide is a blue book named *"Crafting Guide"* or a wooden sign.
 
 This crafting guide features a **progressive mode**.
-The progressive mode is a Terraria-like system that only shows recipes you can craft from items in inventory.
+The progressive mode is a Terraria-like system that only shows recipes you can craft
-The progressive mode can be enabled with `craftguide_progressive_mode = true` in `minetest.conf`.
+from items you ever had in your inventory. To enable it: `craftguide_progressive_mode = true` in `minetest.conf`.
 
-`craftguide` is also integrated in `sfinv` (Minetest Game inventory) when you enable it with
+`craftguide` is also integrated in `sfinv` (Minetest Game inventory). To enable it:
 `craftguide_sfinv_only = true` in `minetest.conf`.
 
 Use the command `/craft` to show the recipe(s) of the pointed node.
@@ -49,6 +49,10 @@ craftguide.register_craft({
 This function adds a recipe filter when progressive mode is enabled.
 The default `craftguide` filter will still be used.
 
+The function should return the recipes to be displayed, given the available
+recipes and an `ObjectRef` to the user. Each recipe is a table of the form
+returned by `minetest.get_craft_recipe`.
+
 Example function to hide recipes for items from a mod called "secretstuff":
 
 ```lua

init.lua

@@ -16,6 +16,7 @@ local sfinv_only       = mt.settings:get_bool("craftguide_sfinv_only")
 local reg_items = mt.registered_items
 local get_result = mt.get_craft_result
 local show_formspec = mt.show_formspec
+local serialize, deserialize = mt.serialize, mt.deserialize
 
 -- Intllib
 local S = dofile(mt.get_modpath("craftguide") .. "/intllib.lua")
@@ -47,6 +48,28 @@ local group_stereotypes = {
 	mesecon_conductor_craftable = "mesecons:wire_00000000_off",
 }
 
+local function table_merge(t, t2)
+	for i = 1, #t2 do
+		t[#t + 1] = t2[i]
+	end
+
+	return t
+end
+
+local function table_clean(t)
+	local hash, ct = {}, {}
+	for i = 1, #t do
+		local v = t[i]
+		if not hash[v] then
+			ct[#ct + 1] = v
+			hash[v] = true
+		end
+	end
+
+	sort(ct)
+	return ct
+end
+
 local function __func()
 	return debug.getinfo(2, "n").name
 end
@@ -328,8 +351,8 @@ local function get_recipe_fs(data, iY)
 	return concat(fs)
 end
 
-local function make_formspec(player_name)
+local function make_formspec(name)
-	local data = player_data[player_name]
+	local data = player_data[name]
 	local iY = sfinv_only and 4 or data.iX - 5
 	local ipp = data.iX * iY
 
@@ -376,8 +399,8 @@ local function make_formspec(player_name)
 
 	local first_item = (data.pagenum - 1) * ipp
 	for i = first_item, first_item + ipp - 1 do
-		local name = data.items[i + 1]
+		local item = data.items[i + 1]
-		if not name then
+		if not item then
 			break
 		end
 
@@ -389,8 +412,8 @@ local function make_formspec(player_name)
 			Y,
 			1.1,
 			1.1,
-			name,
+			item,
-			name)
+			item)
 	end
 
 	if data.recipes and #data.recipes > 0 then
@@ -400,13 +423,13 @@ local function make_formspec(player_name)
 	return concat(fs)
 end
 
-local show_fs = function(player, player_name)
+local show_fs = function(player, name)
 	if sfinv_only then
 		sfinv.set_player_inventory_formspec(player)
 	else
-		local data = player_data[player_name]
+		local data = player_data[name]
-		data.formspec = make_formspec(player_name)
+		data.formspec = make_formspec(name)
-		show_formspec(player_name, "craftguide", data.formspec)
+		show_formspec(name, "craftguide", data.formspec)
 	end
 end
 
@@ -417,7 +440,7 @@ local function filter_items(data)
 		return
 	end
 
-	local items_list = progressive_mode and data.progressive_items or init_items
+	local items_list = progressive_mode and data.p_items or init_items
 	local filtered_list, c = {}, 0
 
 	for i = 1, #items_list do
@@ -478,17 +501,14 @@ local function get_inv_items(player)
 	local inv = player:get_inventory()
 	local stacks = inv:get_list("main")
 	local craftlist = inv:get_list("craft")
-
+	stacks = table_merge(stacks, craftlist)
-	for i = 1, #craftlist do
-		stacks[#stacks + 1] = craftlist[i]
-	end
 
 	local inv_items = {}
 	for i = 1, #stacks do
 		local stack = stacks[i]
 		if not stack:is_empty() then
 			local name = stack:get_name()
-			if not inv_items[name] and reg_items[name] then
+			if reg_items[name] then
 				inv_items[#inv_items + 1] = name
 			end
 		end
@@ -498,16 +518,17 @@ local function get_inv_items(player)
 end
 
 local function item_in_inv(item, inv_items)
+	local inv_items_size = #inv_items
 	if item:sub(1,6) == "group:" then
 		local groups = extract_groups(item)
-		for i = 1, #inv_items do
+		for i = 1, inv_items_size do
 			local item_groups = reg_items[inv_items[i]].groups
 			if item_has_groups(item_groups, groups) then
 				return true
 			end
 		end
 	else
-		for i = 1, #inv_items do
+		for i = 1, inv_items_size do
 			if inv_items[i] == item then
 				return true
 			end
@@ -516,15 +537,25 @@ local function item_in_inv(item, inv_items)
 end
 
 local function progressive_default_filter(recipes, player)
+	local name = player:get_player_name()
+	local data = player_data[name]
 	local inv_items = get_inv_items(player)
+
+	if data.inv_items then
+		inv_items = table_merge(data.inv_items, inv_items)
+	end
+
 	if #inv_items == 0 then
 		return {}
 	end
 
+	data.inv_items = inv_items
+
 	local filtered = {}
 	for i = 1, #recipes do
 		local recipe = recipes[i]
 		local recipe_in_inv = true
+
 		for _, item in pairs(recipe.items) do
 			if not item_in_inv(item, inv_items) then
 				recipe_in_inv = false
@@ -571,8 +602,10 @@ local function apply_progressive_filters(recipes, player)
 	return recipes
 end
 
-local function get_progressive_items(player)
+local function get_progressive_items(player, name)
-	local items = {}
+	local data = player_data[name]
+	local items = data and data.p_items or {}
+
 	for i = 1, #init_items do
 		local item = init_items[i]
 		local recipes = recipes_cache[item]
@@ -585,18 +618,35 @@ local function get_progressive_items(player)
 		end
 	end
 
+	items = table_clean(items)
 	return items
 end
 
 local function init_data(player, name)
-	local p_items = progressive_mode and get_progressive_items(player) or nil
 	player_data[name] = {
 		filter  = "",
 		pagenum = 1,
 		iX      = sfinv_only and 8 or DEFAULT_SIZE,
-		items   = p_items or init_items,
-		progressive_items = p_items,
 	}
+
+	local p_items
+	if progressive_mode then
+		local meta = player:get_meta()
+		player_data[name].inv_items = deserialize(meta:get_string("inv_items"))
+		p_items = get_progressive_items(player, name)
+
+		if p_items then
+			local old_items = deserialize(meta:get_string("p_items"))
+			if old_items then
+				p_items = table_merge(p_items, old_items)
+				p_items = table_clean(p_items)
+			end
+		end
+
+		player_data[name].p_items = p_items
+	end
+
+	player_data[name].items = p_items or init_items
 end
 
 local function reset_data(data)
@@ -605,7 +655,7 @@ local function reset_data(data)
 	data.query_item  = nil
 	data.show_usages = nil
 	data.recipes     = nil
-	data.items       = progressive_mode and data.progressive_items or init_items
+	data.items       = progressive_mode and data.p_items or init_items
 end
 
 local function get_init_items()
@@ -624,15 +674,13 @@ local function get_init_items()
 	sort(init_items)
 end
 
-mt.register_on_mods_loaded(get_init_items)
-
 local function on_receive_fields(player, fields)
-	local player_name = player:get_player_name()
+	local name = player:get_player_name()
-	local data = player_data[player_name]
+	local data = player_data[name]
 
 	if fields.clear then
 		reset_data(data)
-		show_fs(player, player_name)
+		show_fs(player, name)
 
 	elseif fields.alternate then
 		if #data.recipes == 1 then
@@ -641,7 +689,7 @@ local function on_receive_fields(player, fields)
 
 		local num_next = data.rnum + 1
 		data.rnum = data.recipes[num_next] and num_next or 1
-		show_fs(player, player_name)
+		show_fs(player, name)
 
 	elseif (fields.key_enter_field == "filter" or fields.search) and
 			fields.filter ~= "" then
@@ -653,7 +701,7 @@ local function on_receive_fields(player, fields)
 		data.filter = fltr
 		data.pagenum = 1
 		filter_items(data)
-		show_fs(player, player_name)
+		show_fs(player, name)
 
 	elseif fields.prev or fields.next then
 		if data.pagemax == 1 then
@@ -667,13 +715,13 @@ local function on_receive_fields(player, fields)
 			data.pagenum = data.pagemax
 		end
 
-		show_fs(player, player_name)
+		show_fs(player, name)
 
 	elseif (fields.size_inc and data.iX < MAX_LIMIT) or
 			(fields.size_dec and data.iX > MIN_LIMIT) then
 		data.pagenum = 1
 		data.iX = data.iX + (fields.size_inc and 1 or -1)
-		show_fs(player, player_name)
+		show_fs(player, name)
 
 	else
 		local item
@@ -728,7 +776,7 @@ local function on_receive_fields(player, fields)
 		data.recipes = recipes
 		data.rnum = 1
 
-		show_fs(player, player_name)
+		show_fs(player, name)
 	end
 end
 
@@ -737,18 +785,20 @@ if sfinv_only then
 		title = "Craft Guide",
 
 		get = function(self, player, context)
-			local formspec = make_formspec(player:get_player_name())
+			local name = player:get_player_name()
+			local formspec = make_formspec(name)
+
 			return sfinv.make_formspec(player, context, formspec)
 		end,
 
 		on_enter = function(self, player, context)
-			local player_name = player:get_player_name()
+			local name = player:get_player_name()
-			local data = player_data[player_name]
+			local data = player_data[name]
 
 			if not data then
-				init_data(player, player_name)
+				init_data(player, name)
 			elseif progressive_mode then
-				data.progressive_items = get_progressive_items(player)
+				data.p_items = get_progressive_items(player, name)
 				filter_items(data)
 			end
 		end,
@@ -765,20 +815,20 @@ else
 	end)
 
 	local function on_use(user)
-		local player_name = user:get_player_name()
+		local name = user:get_player_name()
-		local data = player_data[player_name]
+		local data = player_data[name]
 
 		if not data then
-			init_data(user, player_name)
+			init_data(user, name)
-			data = player_data[player_name]
+			data = player_data[name]
-			data.formspec = make_formspec(player_name)
+			data.formspec = make_formspec(name)
 		elseif progressive_mode then
-			data.progressive_items = get_progressive_items(user)
+			data.p_items = get_progressive_items(user, name)
 			filter_items(data)
-			data.formspec = make_formspec(player_name)
+			data.formspec = make_formspec(name)
 		end
 
-		show_formspec(player_name, "craftguide", data.formspec)
+		show_formspec(name, "craftguide", data.formspec)
 	end
 
 	mt.register_craftitem("craftguide:book", {
@@ -911,13 +961,36 @@ if not progressive_mode then
 	})
 end
 
+mt.register_on_mods_loaded(get_init_items)
+
+local function save_meta(player, data)
+	local meta = player:get_meta()
+	meta:set_string("p_items", serialize(data.p_items))
+	meta:set_string("inv_items", serialize(data.inv_items))
+end
+
 mt.register_on_leaveplayer(function(player)
-	if player then
+	local name = player:get_player_name()
-		local name = player:get_player_name()
+	if progressive_mode then
-		player_data[name] = nil
+		save_meta(player, player_data[name])
 	end
+
+	player_data[name] = nil
 end)
 
+if progressive_mode then
+	mt.register_on_shutdown(function()
+		local players = mt.get_connected_players()
+		for i = 1, #players do
+			local player = players[i]
+			if player then
+				local name = player:get_player_name()
+				save_meta(player, player_data[name])
+			end
+		end
+	end)
+end
+
 --[[ Custom recipes (>3x3) test code
 
 mt.register_craftitem(":secretstuff:custom_recipe_test", {