Add transport belt capacity techs if the DLC is installed

data-updates.lua

@@ -4,6 +4,7 @@ end
 
 require "prototypes/updates/base-updates"
 require "prototypes/updates/entity-updates"
+require "prototypes/technologies/stacking-belts"
 
 ITEM("automation-science-pack", "tool"):set("icon", "__pycoalprocessinggraphics__/graphics/icons/science-pack-1.png")
 ITEM("automation-science-pack", "tool"):set("icon_size", 64)
@@ -219,7 +220,6 @@ RECIPE("beacon-mk01")
     :add_ingredient {"stainless-steel", 10}:remove_ingredient {"steel-plate"}
     :add_ingredient {"tower-mk02", 1}
 
-
 if register_cache_file ~= nil then
     register_cache_file({"pycoalprocessing"}, "__pycoalprocessing__/cached-configs/pycoalprocessing.lua")
 end

locale/en/locale.cfg

@@ -17,6 +17,7 @@ fuelrod=Fuel rod
 biomass=Biomass
 
 [technology-name]
+transport-belt-capacity=Transport belt capacity
 coal-processing=Coal processing
 methanol-processing=Methanol processing
 cooling-tower=Cooling tower
@@ -89,11 +90,10 @@ rare-earth=Give access to explore the rare-earth elements.
 fine-electronics=Because high tech stuff is necessary in this planet.
 crusher=Allow better yields from pre-processing ores.
 automation-3=Assembling machines capable of processing fluid ingredients, with additional speed.
-
 kevlar-mk02=Kevlar harder
 syngas=Unlocks a higher-octane, multipurpose fuel synthesised from coal gas. Or is it just fake gas?
-
 pyrrhic=Research this technology to win the game\n\n"Did you do it?"\n"Yes."\n"What did it cost?"\n"...Everything."
+belt-capacity=Increase the height of layered stacks of items on transport belts.
 
 [recipe-name]
 coal-gas=Coal gas from coal

prototypes/technologies/stacking-belts.lua

@@ -0,0 +1,53 @@
+if not feature_flags.space_travel then return end
+
+for _, miner in pairs(data.raw["mining-drill"]) do
+    miner.drops_full_belt_stacks = true
+end
+
+local science_packs_that_unlock_belt_stacking = {
+    "py-science-pack-mk01",
+    "logistic-science-pack",
+    "py-science-pack-mk02",
+    "chemical-science-pack",
+    "py-science-pack-mk03",
+    "production-science-pack",
+    "py-science-pack-mk04",
+    "utility-science-pack",
+}
+
+local i = 1
+for _, science in pairs(science_packs_that_unlock_belt_stacking) do
+    if not data.raw.technology[science] then goto continue end
+
+    local prerequisites = {science}
+    if i > 1 then
+        prerequisites = {"transport-belt-capacity-" .. (i - 1)}
+    end
+
+    local tech = {
+        type = "technology",
+        name = "transport-belt-capacity-" .. i,
+        localised_description = {"technology-description.belt-capacity"},
+        icons = util.technology_icon_constant_stack_size("__pycoalprocessinggraphics__/graphics/technology/transport-belt-capacity.png"),
+        effects = {
+            {
+                type = "belt-stack-size-bonus",
+                modifier = 1
+            }
+        },
+        prerequisites = prerequisites,
+        unit = {
+            count = 2000,
+            ingredients =
+            {
+                {science,   1}
+            },
+            time = 60
+        },
+        upgrade = true
+    }
+
+    data:extend{tech}
+
+    ::continue::
+end