Add metatable functions

README.md

@@ -44,8 +44,8 @@ Dependencies: Minetest Game or MineClone.
 * Dark and Red Matter Armor can make the player invincible. This is an [engine problem](https://github.com/minetest/minetest/issues/14344) that I can't fix.
 * Mobs Redo (and mods that use it) don't care that DM/RM tools are supposed to be unbreakable and add wear to them anyway.
 * Covalence Dust and the Talisman of Repair cannot repair certain tools. This will not be fixed.
-* The recipe for Energy Collectors doesn't include glowstone even though they are very glowstone-y. This will probably not be fixed because glowstone doesn't exist in MTG.
 * DM/RM tools are too fast in MTG (can't figure out why)
+* When placing torches with a pick/morningstar, if the placement fails, it still costs energy. This will probably not be fixed.
 
 **If you have a suggestion or notice a bug that isn't on this list, visit the [GitHub issues page](https://github.com/thepython10110/exchangeclone/issues).**
 
@@ -84,8 +84,6 @@ You can find the old textures and sounds by going back to previous commits in Gi
 - [x] Add more matter/fuel types
 - [x] Make collectors less expensive and less effective (gold instead of glowstone)
 - [x] Make collectors use ProjectExpansion's textures
-- [ ] Add Knowledge Sharing Book
-    - [ ] Add function for getting player's learned items
 - [ ] Add Evertide Amulet
 - [ ] Add Volcanite Amulet
 - [ ] Add Zero Ring
@@ -96,8 +94,8 @@ You can find the old textures and sounds by going back to previous commits in Gi
 - [ ] Add Pedestal abilities
     - [x] Passive Stones
     - [x] Talisman
-    - [ ] Evertide
+    - [ ] Evertide (MCL)
-    - [ ] Volcanite
+    - [ ] Volcanite (MCL)
     - [ ] Zero
     - [ ] Ignition
     - [ ] Black Hole/Void
@@ -117,13 +115,16 @@ You can find the old textures and sounds by going back to previous commits in Gi
     * Added the Dark Matter Pedestal.
     * Added Alchemical Books.
     * DM/RM armor now use ProjectE's textures.
-    * Added Magenta through White Matter (would have added fading matter, but it's over 1 trillion EMC)
+    * Added Magenta through White Fuel/Matter (would have added fading matter, but it's over 1 trillion EMC)
+    * Added `_get_emc`, `_set_emc`, and `_add_emc` to player metatables. This means you can use `player:_get_emc()` instead of `exchangeclone.get_player_emc(player)`. **WARNING: Do not use these functions in `on_joinplayer` functions.**
+    * Added the same functions for itemstack metatables, as well as `_<get/set/add>_star_emc` and `_get_star_max`. `_set_emc` and `_add_emc` work by changing the metadata EMC value.
 * Changes:
     * The Constructor and Deconstructor are now deprecated, replaced with the EMC Link.
     * Upgrades and Stars can no longer be used as fuel.
     * Dark and Red Matter Armor now uses ProjectE's textures
     * Removed the ability to right click with stars to see the charge (it's unnecessary).
     * Organized textures into folders
+    * Collectors now match ProjectExpansion's in every way possible (except MTG doesn't have glowstone so it's replaced with gold in the recipe)
 * Bugfixes:
     * Dark and Red Matter Armor display properly (and identically) in both games, with ProjectE's textures.
     * `add_star_emc` now correctly works with negative energy values.
@@ -501,7 +502,7 @@ I didn't get to everything I wanted to, mostly because the automatic energy valu
 * Pedestals\*\* (haven't added all the abilities yet)
 * Black Hole Band and Void Ring\*
 * Nova Catalyst/Cataclysm?
-* Knowledge Sharing Book\*
+* Knowledge Sharing Book
 * EMC Link\*\*
 
 \* Planned for v8.0

exchangeclone/alchemical_books.lua

@@ -193,12 +193,12 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
         local distance = vector.distance(adjusted_player_pos, adjusted_pos)
         local emc_per_node = stack:get_definition().alchemical_book_data.emc_per_node
         local cost = distance*emc_per_node
-        local player_emc = exchangeclone.get_player_emc(player)
+        local player_emc = player:_get_emc()
         if player_emc < cost then
             minetest.chat_send_player(player:get_player_name(), "Not enough EMC to teleport.")
         else
             player:set_pos(pos)
-            exchangeclone.add_player_emc(-cost)
+            player:_add_emc(-cost)
         end
         show_formspec(player, index, fields.name, use_stack_data)
     elseif fields.location_list then
@@ -220,12 +220,12 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
             local distance = vector.distance(adjusted_player_pos, adjusted_pos)
             local emc_per_node = stack:get_definition().alchemical_book_data.emc_per_node
             local cost = distance*emc_per_node
-            local player_emc = exchangeclone.get_player_emc(player)
+            local player_emc = player:_get_emc()
             if player_emc < cost then
                 minetest.chat_send_player(player:get_player_name(), "Not enough EMC to teleport.")
             else
                 player:set_pos(pos)
-                exchangeclone.add_player_emc(-cost)
+                player:_add_emc(-cost)
             end
         end
         show_formspec(player, index, fields.name, use_stack_data)

exchangeclone/covalence_dust.lua

@@ -80,7 +80,7 @@ local function is_repairable_gear(item)
     item = ItemStack(item)
     if item:get_wear() <= 0 then return end
     if minetest.get_item_group(item:get_name(), "disable_repair") > 0 then return end
-    if (exchangeclone.get_item_emc(item) or 0) <= 0 then return end
+    if (item:_get_emc() or 0) <= 0 then return end
     local def = item:get_definition()
     if def
     and def.type == "tool"
@@ -129,7 +129,7 @@ minetest.register_on_player_inventory_action(function(player, action, inventory,
         if gear_stack:is_empty() or dust_stack:is_empty() then return end
         if not inventory:room_for_item("exchangeclone_covalence_output", gear_stack) then return end
         local amount = is_repairable_gear(gear_stack)
-        local emc_value = exchangeclone.get_item_emc(gear_stack)
+        local emc_value = gear_stack:_get_emc()
         local tier = 3
         if emc_value/amount < 50 then
             tier = 1

exchangeclone/emc_link.lua

@@ -36,7 +36,7 @@ local function link_action(pos)
     local stored_emc
     local target = inv:get_stack("target", 1):get_name()
     local output_stack = inv:get_stack("dst", 1)
-    local in_indiv_emc = exchangeclone.get_item_emc(input_stack:peek_item()) or 0
+    local in_indiv_emc = input_stack:peek_item():_get_emc() or 0
     local target_emc = exchangeclone.get_item_emc(target)
     local stack_max = ItemStack(target):get_stack_max()
 
@@ -44,12 +44,13 @@ local function link_action(pos)
     if minetest.get_item_group(star_stack:get_name(), "klein_star") > 0 then
         using_star = true
         limit = exchangeclone.get_star_max(star_stack)
-        stored_emc = exchangeclone.get_star_itemstack_emc(star_stack)
+        stored_emc = star_stack:get_star_emc()
     else
         using_star = false
         limit = exchangeclone.limit
         player = minetest.get_player_by_name(meta:get_string("exchangeclone_placer"))
-        stored_emc = exchangeclone.get_player_emc(player)
+        if not player then return true end
+        stored_emc = player:_get_emc()
     end
     -- Construct
     if target ~= "" and (output_stack:is_empty() or exchangeclone.handle_alias(output_stack) == target) then
@@ -60,7 +61,7 @@ local function link_action(pos)
                 minetest.log(dump({out_count = out_count, target_emc = target_emc}))
                 exchangeclone.add_star_emc(inv, "fuel", 1, -out_count*target_emc)
             else
-                exchangeclone.add_player_emc(player, -out_count*target_emc)
+                player:_add_emc(-out_count*target_emc)
             end
         end
     end
@@ -73,7 +74,7 @@ local function link_action(pos)
             if using_star then
                 exchangeclone.add_star_emc(inv, "fuel", 1, max_count*in_indiv_emc)
             else
-                exchangeclone.add_player_emc(player, max_count*in_indiv_emc)
+                player:_add_emc(max_count*in_indiv_emc)
             end
         end
     end
@@ -95,13 +96,13 @@ local function allow_metadata_inventory_put(pos, listname, index, stack, player)
             return stack:get_count()
         end
     elseif listname == "src" then
-        local emc = exchangeclone.get_item_emc(stack)
+        local emc = stack:_get_emc()
         if emc and emc > 0 then
             return stack:get_count()
         end
     elseif listname == "target" then
         local single_item = stack:peek_item()
-        local emc = exchangeclone.get_item_emc(single_item)
+        local emc = single_item:_get_emc()
         if emc and emc > 0 then
             minetest.get_meta(pos):get_inventory():set_stack("target", 1, ItemStack(exchangeclone.handle_alias(single_item)))
             link_action(pos)

exchangeclone/energy_collectors.lua

@@ -73,7 +73,7 @@ local function on_timer(pos, elapsed)
             if placer and placer ~= "" then
                 local player = minetest.get_player_by_name(placer)
                 if player then
-                    exchangeclone.add_player_emc(player, amount)
+                    player:_add_emc(amount)
                 end
             end
         end
@@ -240,7 +240,7 @@ for i = 2, #collectors do
     local previous = "exchangeclone:"..collectors[i-1]:lower().."_collector"
     exchangeclone.register_energy_collector(
         "exchangeclone:"..codified,
-        S(collector.." Energy Collector [MK"..i.."]"),
+        S(collector.." Collector [MK"..i.."]"),
         4*math.pow(6,i-1),
         "exchangeclone_"..codified..".png",
         {

exchangeclone/gem_of_eternal_density.lua

@@ -11,7 +11,7 @@ local function get_gem_description(itemstack)
     local current_target = math.max(meta:get_int("density_target"), 1)
     local target_message = "Target: "..ItemStack(exchangeclone.density_targets[current_target]):get_short_description()
     local emc = exchangeclone.get_item_emc(itemstack:get_name())
-    local stored = exchangeclone.get_item_emc(itemstack) - emc
+    local stored = itemstack:_get_emc() - emc
     return "Gem of Eternal Density\n"..target_message.."\nEMC: "..exchangeclone.format_number(emc).."\nStored EMC: "..exchangeclone.format_number(stored)
 end
 
@@ -24,7 +24,7 @@ local function condense(player, itemstack)
     local min = player:hud_get_hotbar_itemcount() + 1
     if player:get_wield_index() >= min then return end
 
-    local total_emc = exchangeclone.get_item_emc(itemstack) - exchangeclone.get_item_emc(itemstack:get_name())
+    local total_emc = itemstack:_get_emc() - exchangeclone.get_item_emc(itemstack:get_name())
     local target = exchangeclone.density_targets[math.max(meta:get_int("density_target"),  1)]
     local filter
     local current_mode = player:get_meta():get_string("exchangeclone_goed_filter_type")
@@ -45,7 +45,7 @@ local function condense(player, itemstack)
     for i = min, #list do
         local stack = list[i]
         if filter(stack) and stack:get_name() ~= target then
-            local emc = exchangeclone.get_item_emc(stack) or 0
+            local emc = stack:_get_emc() or 0
             local individual_emc = exchangeclone.get_item_emc(stack:get_name()) or 0
             if individual_emc > 0 and individual_emc <= exchangeclone.get_item_emc(target) then
                 total_emc = total_emc + emc
@@ -85,7 +85,7 @@ local function condense(player, itemstack)
     if meta:get_string("exchangeclone_active") ~= "true" then
         exchangeclone.play_sound(player, "exchangeclone_enable")
     end
-    meta:set_int("exchangeclone_emc_value", exchangeclone.get_item_emc(itemstack:get_name()) + remainder_emc)
+    meta:set_string("exchangeclone_emc_value", exchangeclone.get_item_emc(itemstack:get_name()) + remainder_emc)
     meta:set_string("description", get_gem_description(itemstack))
     return itemstack
 end
@@ -138,7 +138,7 @@ minetest.register_on_joinplayer(function(joining_player)
         minetest.create_detached_inventory(inv_name, {
             allow_put = function(inv, listname, index, stack, player)
                 if player:get_player_name() ~= joining_player:get_player_name() then return 0 end
-                local emc = exchangeclone.get_item_emc(stack)
+                local emc = stack:_get_emc()
                 if emc <= 0 or not emc then return 0 end
                 local stack_copy = ItemStack(stack)
                 stack_copy:set_count(1)

exchangeclone/infinite_food.lua

@@ -9,7 +9,7 @@ local function infinite_food_function(itemstack, player, pointed_thing)
     if click_test ~= false then
         return click_test
     end
-    local player_emc = exchangeclone.get_player_emc(player)
+    local player_emc = player:_get_emc()
     if player_emc >= 64 then
         if stamina_exists then
             if stamina.get_saturation(player) >= stamina_max then
@@ -37,9 +37,8 @@ minetest.register_tool("exchangeclone:infinite_food", {
 })
 
 minetest.register_on_item_eat(function(hp_change, replace_with_item, itemstack, player, pointed_thing)
-    local player_emc = exchangeclone.get_player_emc(player)
     if itemstack:get_name() == "exchangeclone:infinite_food" then
-        exchangeclone.set_player_emc(player, player_emc - 64)
+        player:_add_emc(-64)
     end
 end)
 

exchangeclone/klein_stars.lua

@@ -29,7 +29,7 @@ for i, name in ipairs(names) do
         _mcl_generate_description = function(itemstack)
             return name.."\n"..S(
                 "Current Charge: @1/@2",
-                exchangeclone.format_number(exchangeclone.get_star_itemstack_emc(itemstack)),
+                exchangeclone.format_number(itemstack:_get_star_emc()),
                 exchangeclone.format_number(capacity)
             )
         end

exchangeclone/passive_stones.lua

@@ -32,9 +32,9 @@ minetest.register_tool("exchangeclone:soul_stone", {
     inventory_image = "exchangeclone_soul_stone.png",
     _exchangeclone_passive = {
         func = function(player)
-            if exchangeclone.get_player_emc(player) >= 64 then
+            if player:_get_emc() >= 64 then
                 if heal(player, 2) then
-                    exchangeclone.add_player_emc(player, -64)
+                    player:_add_emc(-64)
                 end
             end
         end,
@@ -68,9 +68,9 @@ if (exchangeclone.mcl and mcl_hunger.active) or (exchangeclone.mtg and minetest.
         inventory_image = "exchangeclone_body_stone.png",
         _exchangeclone_passive = {
             func = function(player)
-                if exchangeclone.get_player_emc(player) >= 64 then
+                if player:_get_emc() >= 64 then
                     if satiate(player, 2) then
-                        exchangeclone.add_player_emc(player, -64)
+                        player:_add_emc(-64)
                     end
                 end
             end,
@@ -105,7 +105,7 @@ if (exchangeclone.mcl and mcl_hunger.active) or (exchangeclone.mtg and minetest.
         inventory_image = "exchangeclone_life_stone.png",
         _exchangeclone_passive = {
             func = function(player)
-                if exchangeclone.get_player_emc(player) >= 64 then
+                if player:_get_emc() >= 64 then
                     local changed
                     if heal(player, 2)  then
                         changed = true
@@ -114,7 +114,7 @@ if (exchangeclone.mcl and mcl_hunger.active) or (exchangeclone.mtg and minetest.
                         changed = true
                     end
                     if changed then
-                        exchangeclone.add_player_emc(player, -64)
+                        player:_add_emc(-64)
                     end
                 end
             end,
@@ -145,7 +145,7 @@ if exchangeclone.mcl then
 
     local function get_mind_description(itemstack)
         local meta = itemstack:get_meta()
-        local emc = exchangeclone.get_item_emc(itemstack) or 0
+        local emc = itemstack:_get_emc() or 0
         local stored = meta:get_int("exchangeclone_stored_xp") or 0
         return "Mind Stone\nEMC: "..exchangeclone.format_number(emc).."\nStored XP: "..exchangeclone.format_number(stored)
     end

exchangeclone/pickaxes.lua

@@ -71,7 +71,7 @@ local function pickaxe_on_use(itemstack, player, pointed_thing)
         elseif itemstack:get_name():find("red_") then
             local result = exchangeclone.place_torch(player, pointed_thing)
             if result then
-                exchangeclone.add_player_emc(player, result)
+                player:_add_emc(result)
                 -- If the torch could not be placed, it still costs EMC... not sure how to fix that
             end
         end

exchangeclone/red_matter_multitools.lua

@@ -179,9 +179,11 @@ local function morningstar_on_use(itemstack, player, pointed_thing)
 		elseif minetest.get_item_group(name, exchangeclone.pickaxe_group) > 0 and sneaking then
 			exchangeclone.hammer_action(itemstack, player, pointed_thing.under)
 		else
-			exchangeclone.place_torch(player, pointed_thing)
+            local result = exchangeclone.place_torch(player, pointed_thing)
-			exchangeclone.add_player_emc(player, -math.max(exchangeclone.get_item_emc(exchangeclone.itemstrings.torch) or 8, 8))
+            if result then
-			-- If the torch could not be placed, it still costs EMC... not sure how to fix that
+                player:_add_emc(result)
+                -- If the torch could not be placed, it still costs EMC... not sure how to fix that
+            end
 			return
 		end
 	elseif sneaking then

exchangeclone/register_emc.lua

@@ -115,7 +115,7 @@ end
 exchangeclone.emc_values = {}
 
 -- Sets the EMC value of an item, must be called during load time.
-local function set_item_emc(itemstring, emc_value)
+local function register_emc(itemstring, emc_value)
     if not (emc_value and itemstring) then return end
     emc_value = math.floor(emc_value*20)/20 -- floor to nearest .05
     if emc_value < 0 then return end
@@ -297,19 +297,19 @@ end
 local grouped_items = exchangeclone.get_group_items(groupnames, true, true)
 for index, group in ipairs(exchangeclone.group_values) do
     for i, item in pairs(grouped_items[group[1]]) do
-        set_item_emc(item, group[2])
+        register_emc(item, group[2])
     end
 end
 
 -- Register base EMC values
 for itemstring, emc_value in pairs(exchangeclone.base_emc_values) do
-    set_item_emc(itemstring, emc_value)
+    register_emc(itemstring, emc_value)
 end
 
 -- Register `exchangeclone_custom_emc` values and decide whether to automatically register EMC values
 for itemstring, def in pairs(minetest.registered_items) do
     if def.exchangeclone_custom_emc then
-        set_item_emc(itemstring, def.exchangeclone_custom_emc)
+        register_emc(itemstring, def.exchangeclone_custom_emc)
     else
         itemstring = exchangeclone.handle_alias(itemstring) or itemstring
         def = minetest.registered_items[itemstring] -- in case itemstring changed
@@ -364,7 +364,7 @@ while not same do
     for itemstring, _ in pairs(auto) do
         local cheapest = get_cheapest_recipe(itemstring)
         if cheapest then
-            set_item_emc(itemstring, cheapest)
+            register_emc(itemstring, cheapest)
             auto[itemstring] = nil
         end
     end
@@ -372,8 +372,8 @@ while not same do
 end
 
 if exchangeclone.mcl then
-    set_item_emc("mcl_campfires:campfire", exchangeclone.get_item_emc("mcl_campfires:campfire_lit"))
+    register_emc("mcl_campfires:campfire", exchangeclone.get_item_emc("mcl_campfires:campfire_lit"))
-    set_item_emc("mcl_campfires:soul_campfire", exchangeclone.get_item_emc("mcl_campfires:soul_campfire_lit"))
+    register_emc("mcl_campfires:soul_campfire", exchangeclone.get_item_emc("mcl_campfires:soul_campfire_lit"))
     -- Recovery compasses use a random compass frame for the crafting recipe... Incredibly irritating.
     for i = 0, 31 do
         if exchangeclone.get_item_emc("mcl_compass:"..i.."_recovery") then
@@ -404,12 +404,12 @@ local cheapest_advanced_itemstring = "exchangeclone:advanced_alchemical_chest_".
 
 for color, color_data in pairs(exchangeclone.colors) do
     local advanced_itemstring = "exchangeclone:advanced_alchemical_chest_"..color
-    set_item_emc(advanced_itemstring, exchangeclone.get_item_emc(cheapest_advanced_itemstring))
+    register_emc(advanced_itemstring, exchangeclone.get_item_emc(cheapest_advanced_itemstring))
 end
 
 -- Adds EMC values to aliased items, even though they're not used (just so it's displayed)
 for alias, itemstring in pairs(exchangeclone.emc_aliases) do
-    set_item_emc(itemstring, exchangeclone.get_item_emc(alias))
+    register_emc(itemstring, exchangeclone.get_item_emc(alias))
 end
 
 -- Delete unnecessary data (waste of memory)

exchangeclone/tool_upgrades.lua

@@ -75,9 +75,9 @@ local function upgrader_action(pos)
     local new_tool = exchangeclone.enchant(tool, upgrade_def.enchantment, upgrade_def.level)
     if not new_tool then return end -- If the tool already has that enchantment
 
-    local new_emc = exchangeclone.get_item_emc(new_tool) + exchangeclone.get_item_emc(upgrade:get_name())
+    local new_emc = new_tool:_get_emc() + exchangeclone.get_item_emc(upgrade:get_name())
 
-    new_tool:get_meta():set_int("exchangeclone_emc_value", new_emc)
+    new_tool:get_meta():set_string("exchangeclone_emc_value", new_emc)
 
     inv:set_stack("dst", 1, new_tool)
 

exchangeclone/transmutation_table.lua

@@ -16,7 +16,7 @@ local function get_amount_label(itemstring, player_emc)
 end
 
 local function get_transmutation_buttons(player, page, x, y)
-    local player_emc = exchangeclone.get_player_emc(player)
+    local player_emc = player:_get_emc()
     local pages = minetest.deserialize(player:get_meta():get_string("exchangeclone_transmutation")) or {}
     if page < 1 then page = 1 end
     if not pages[1] then
@@ -52,7 +52,7 @@ end
 
 function exchangeclone.reload_transmutation_list(player, search)
     local meta = player:get_meta()
-    local player_emc = exchangeclone.get_player_emc(player)
+    local player_emc = player:_get_emc()
     local items_to_show = minetest.deserialize(meta:get_string("exchangeclone_transmutation_learned_items")) or {}
 	local lang = minetest.get_player_information(player:get_player_name()).lang_code
     local pages = {}
@@ -102,13 +102,13 @@ local function add_to_output(player, amount, show)
     if minetest.registered_items[item] then
         local emc_value = exchangeclone.get_item_emc(item)
         if not emc_value then return end
-        local player_emc = exchangeclone.get_player_emc(player)
+        local player_emc = player:_get_emc()
         local stack_max = ItemStack(item):get_stack_max()
         if amount == true then amount = stack_max end
         local max_amount = math.min(amount, stack_max, math.floor(player_emc/emc_value))
         local inventory = minetest.get_inventory({type = "detached", name = "exchangeclone_transmutation_"..player:get_player_name()})
         local added_amount = max_amount - inventory:add_item("output", ItemStack(item.." "..max_amount)):get_count()
-        exchangeclone.add_player_emc(player, math.min(player_emc, -(emc_value * added_amount))) -- not sure if "math.min()" is necessary
+        player:_add_emc(math.min(player_emc, -(emc_value * added_amount))) -- not sure if "math.min()" is necessary
         if show then exchangeclone.show_transmutation_table_formspec(player) end
     end
 end
@@ -134,16 +134,16 @@ local function handle_inventory(player, inventory, to_list)
             player:get_meta():set_string("exchangeclone_transmutation_learned_items", minetest.serialize(list))
             inventory:set_stack(to_list, 1, nil)
         else
-            local individual_emc_value = exchangeclone.get_item_emc(single_item)
+            local individual_emc_value = single_item:_get_emc()
             if not individual_emc_value or individual_emc_value <= 0 then return end
-            local player_emc = exchangeclone.get_player_emc(player)
+            local player_emc = player:_get_emc()
             -- How many items can be added?
             local max_count = math.floor((exchangeclone.limit - player_emc)/individual_emc_value)
             -- How many items will be added?
             local add_count = math.min(max_count, stack:get_count())
             -- How much EMC is that?
             local emc_value = individual_emc_value * add_count
-            exchangeclone.add_player_emc(player, emc_value)
+            player:_add_emc(emc_value)
             local item_index = table.indexof(list, itemstring)
             if item_index == -1 then
                 list[#list+1] = itemstring
@@ -158,11 +158,11 @@ local function handle_inventory(player, inventory, to_list)
     elseif to_list == "forget" then
         return
     elseif to_list == "charge" then
-        local player_emc = exchangeclone.get_player_emc(player)
+        local player_emc = player:_get_emc()
-        local star_emc = exchangeclone.get_star_itemstack_emc(stack)
+        local star_emc = stack:_get_star_emc()
         local charge_amount = math.min(exchangeclone.get_star_max(stack) - star_emc, player_emc)
         if charge_amount > 0 then
-            exchangeclone.add_player_emc(player, -charge_amount)
+            player:_add_emc(-charge_amount)
             exchangeclone.add_star_emc(inventory, to_list, 1, charge_amount)
             exchangeclone.show_transmutation_table_formspec(player)
         end
@@ -223,7 +223,7 @@ end
 function exchangeclone.show_transmutation_table_formspec(player, data)
     exchangeclone.reload_transmutation_list(player, data and data.search)
     if not data then data = {} end
-    local player_emc = exchangeclone.get_player_emc(player)
+    local player_emc = player:_get_emc()
     local selection = data.selection or player:get_meta():get_string("exchangeclone_transmutation_selection")
     local player_name = player:get_player_name()
     local inventory_name = "detached:exchangeclone_transmutation_"..player_name
@@ -416,7 +416,7 @@ minetest.register_craft_predict(function(itemstack, player, old_craft_grid, craf
     if itemstack == ItemStack("exchangeclone:tome_of_knowledge") then
         for _, i in pairs({4,6}) do
             local stack = old_craft_grid[i]
-            if exchangeclone.get_star_itemstack_emc(stack) < exchangeclone.get_star_max(stack) then
+            if stack:_get_star_emc() < stack:_get_star_max() then
                 return ItemStack("")
             end
         end

modpack.conf

@@ -1,3 +1,4 @@
 name = exchangeclone
 title = ExchangeClone
-description = Equivalent Exchange/ProjectE for Minetest Game and MineClone! Turn items into EMC and EMC into items, craft OP tools and armor, and more!
+description = Equivalent Exchange/ProjectE for Minetest Game and MineClone! Turn items into EMC and EMC into items, craft OP tools and armor, and more!
+optional_depends = default, mcl_core, technic, ethereal, why_init, nether, mobs

settingtypes.txt

@@ -1,4 +1,4 @@
- Keep unnecessary temporary data (such as the list of recipes) after load time for debugging purposes.
+# Keep unnecessary temporary data (such as the list of recipes) after load time for debugging purposes.
 exchangeclone.keep_data (Keep temporary data after loading) bool false
 
 # Allow the crafting recipe for the Tome of Knowledge

zzzz_exchangeclone_init/lib.lua

@@ -1,7 +1,7 @@
 -- A ton of functions with approximately zero organization. At least there are comments now.
 
 local S = minetest.get_translator()
-local exchangeclone = exchangeclone
+--local exchangeclone = exchangeclone
 
 --- Rounds to the nearest integer
 function exchangeclone.round(num)
@@ -71,7 +71,7 @@ function exchangeclone.get_item_emc(item)
     end
 
     -- Only check metadata for ItemStacks
-    if type(item) == "userdata" then
+    if getmetatable(item) == getmetatable(ItemStack()) then
         local meta_emc_value = item:get_meta():get_string("exchangeclone_emc_value")
         if meta_emc_value == "none" then
             return 0
@@ -89,7 +89,7 @@ function exchangeclone.get_item_emc(item)
     if not def then return end
     if minetest.get_item_group(item:get_name(), "klein_star") > 0 then
         if def.emc_value then
-            return def.emc_value + exchangeclone.get_star_itemstack_emc(item)
+            return def.emc_value + item:_get_star_emc()
         end
     end
     if def.emc_value then
@@ -97,6 +97,26 @@ function exchangeclone.get_item_emc(item)
     end
 end
 
+function exchangeclone.set_item_meta_emc(item, value)
+    if getmetatable(item) ~= getmetatable(ItemStack()) then
+        return
+    end
+    item:get_meta():set_string("exchangeclone_emc_value", value)
+end
+
+function exchangeclone.add_item_meta_emc(item, value)
+    if getmetatable(item) ~= getmetatable(ItemStack()) then
+        return
+    end
+    local current_value = item:get_meta():get_string("exchangeclone_emc_value", value)
+    if current_value == "" or current_value == "none" then
+        current_value = 0
+    else
+        current_value = tonumber(current_value)
+    end
+    item:get_meta():set_string("exchangeclone_emc_value", current_value + value)
+end
+
 -- https://forum.unity.com/threads/re-map-a-number-from-one-range-to-another.119437/
 -- Remaps a number from one range to another
 function exchangeclone.map(input, min1, max1, min2, max2)
@@ -106,6 +126,9 @@ end
 -- Gets the EMC stored in a specified Klein/Magnum Star itemstack.
 function exchangeclone.get_star_itemstack_emc(itemstack)
     if not itemstack then return end
+    if getmetatable(itemstack) ~= getmetatable(ItemStack()) then
+        return
+    end
     if minetest.get_item_group(itemstack:get_name(), "klein_star") < 1 then return end
     return math.max(itemstack:get_meta():get_float("stored_energy"), 0)
 end
@@ -116,13 +139,13 @@ function exchangeclone.get_star_emc(inventory, listname, index)
     if not listname then listname = "main" end
     if not index then index = 1 end
     local itemstack = inventory:get_stack(listname, index)
-    return exchangeclone.get_star_itemstack_emc(itemstack)
+    return itemstack:get_star_emc()
 end
 
 function exchangeclone.set_star_itemstack_emc(itemstack, amount)
     if not itemstack or not amount then return end
     if minetest.get_item_group(itemstack:get_name(), "klein_star") < 1 then return end
-    local old_emc = exchangeclone.get_star_itemstack_emc(itemstack)
+    local old_emc = itemstack:get_star_emc()
     local max = exchangeclone.get_star_max(itemstack)
     if amount > old_emc and old_emc > max then return end -- don't allow more EMC to be put into an over-filled star
 
@@ -131,7 +154,6 @@ function exchangeclone.set_star_itemstack_emc(itemstack, amount)
     meta:set_string("description", itemstack:get_definition()._mcl_generate_description(itemstack))
     local wear = math.max(1, math.min(65535, 65535 - 65535*amount/max))
     itemstack:set_wear(wear)
-    return itemstack
 end
 
 -- Sets the amount of EMC in a star in a specific inventory slot
@@ -140,16 +162,15 @@ function exchangeclone.set_star_emc(inventory, listname, index, amount)
     if not listname then listname = "main" end
     if not index then index = 1 end
     local itemstack = inventory:get_stack(listname, index)
-    local new_stack = exchangeclone.set_star_itemstack_emc(itemstack, amount)
+    itemstack:_set_star_emc(amount)
-    if not new_stack then return end
+    inventory:set_stack(listname, index, itemstack)
-    inventory:set_stack(listname, index, new_stack)
 end
 
 function exchangeclone.add_star_itemstack_emc(itemstack, amount)
     if itemstack and amount then
-        local emc = exchangeclone.get_star_itemstack_emc(itemstack) + amount
+        local emc = itemstack:get_star_emc() + amount
         if not emc or emc < 0 or emc > exchangeclone.get_star_max(itemstack) then return end
-        return exchangeclone.set_star_itemstack_emc(itemstack, emc)
+        itemstack:_set_star_emc(itemstack, emc)
     end
 end
 
@@ -159,9 +180,8 @@ function exchangeclone.add_star_emc(inventory, listname, index, amount)
     if not listname then listname = "main" end
     if not index then index = 1 end
     local itemstack = inventory:get_stack(listname, index)
-    local new_stack = exchangeclone.add_star_itemstack_emc(itemstack, amount)
+    exchangeclone.add_star_itemstack_emc(itemstack, amount)
-    if not new_stack then return end
+    inventory:set_stack(listname, index, itemstack)
-    inventory:set_stack(listname, index, new_stack)
 end
 
 function exchangeclone.get_star_max(item)
@@ -212,7 +232,7 @@ end
 -- Add to a player's personal EMC (amount can be negative)
 function exchangeclone.add_player_emc(player, amount)
     if not (player and amount) then return end
-    exchangeclone.set_player_emc(player, (exchangeclone.get_player_emc(player) or 0) + amount)
+    player:_set_emc((player:_get_emc() or 0) + amount)
 end
 
 -- Through trial and error, I have found that this number (1 trillion) works the best.
@@ -641,12 +661,12 @@ minetest.register_chatcommand("add_player_emc", {
             minetest.chat_send_player(name, "Bad command. Use /add_player_emc [player] [value] or /add_player_emc [value]")
             return
         end
-        local emc = exchangeclone.get_player_emc(target_player)
+        local emc = target_player:_get_emc()
         if (emc + value > exchangeclone.limit) or (emc + value < 0) then
             minetest.chat_send_player(name, "Out of bounds; personal EMC must be between 0 and 1 trillion.")
             return
         end
-        exchangeclone.add_player_emc(target_player, tonumber(value))
+        target_player:_add_emc(tonumber(value))
         minetest.chat_send_player(name, "Added "..exchangeclone.format_number(value).." to "..target_name.."'s personal EMC.")
     end
 })
@@ -669,7 +689,7 @@ minetest.register_chatcommand("get_player_emc", {
             minetest.chat_send_player(name, "Bad command. Use /get_player_emc [player] or /get_player_emc")
             return
         end
-        local emc = exchangeclone.get_player_emc(target_player)
+        local emc = target_player:_get_emc()
         minetest.chat_send_player(name, target_name.."'s personal EMC: "..exchangeclone.format_number(emc))
     end
 })
@@ -702,7 +722,7 @@ minetest.register_chatcommand("set_player_emc", {
             minetest.chat_send_player(name, "Failed to set EMC; must be between 0 and 1 trillion.")
             return
         end
-        exchangeclone.set_player_emc(target_player, tonumber(value))
+        target_player:_set_emc(tonumber(value))
         minetest.chat_send_player(name, "Set "..target_name.."'s personal EMC to "..exchangeclone.format_number(value))
     end
 })
@@ -1198,7 +1218,7 @@ end
 
 function exchangeclone.place_torch(player, pointed_thing)
     local torch_cost = math.max(exchangeclone.get_item_emc(exchangeclone.itemstrings.torch) or 0, 8)
-    if exchangeclone.get_player_emc(player) >= torch_cost then
+    if player:_get_emc() >= torch_cost then
         local torch_on_place = minetest.registered_items[exchangeclone.itemstrings.torch].on_place
         if torch_on_place then
             torch_on_place(ItemStack(exchangeclone.itemstrings.torch), player, pointed_thing)
@@ -1267,4 +1287,26 @@ function exchangeclone.toggle_active(itemstack, player, pointed_thing)
         meta:set_string("inventory_image", "")
     end
     return itemstack
-end
+end
+
+local item_metatable = getmetatable(ItemStack())
+item_metatable._get_emc = exchangeclone.get_item_emc
+item_metatable._set_emc = exchangeclone.set_item_meta_emc
+item_metatable._add_emc = exchangeclone.add_item_meta_emc
+
+item_metatable._get_star_emc = exchangeclone.get_star_itemstack_emc
+item_metatable._set_star_emc = exchangeclone.set_star_itemstack_emc
+item_metatable._add_star_emc = exchangeclone.add_star_itemstack_emc
+item_metatable._get_star_max = exchangeclone.get_star_max
+
+local updated_metatable = false
+
+minetest.register_on_joinplayer(function(player)
+    if not updated_metatable then
+        local player_metatable = getmetatable(player)
+        player_metatable._get_emc = exchangeclone.get_player_emc
+        player_metatable._set_emc = exchangeclone.set_player_emc
+        player_metatable._add_emc = exchangeclone.add_player_emc
+        updated_metatable = true
+    end
+end)