py.global_prerequisite_replacer

changelog.txt

@@ -9,6 +9,8 @@ Date: ????
     - Fix a crash with Schall Machine Scaling
     - Fixed a crash when cleaning up recycling recipes created by quality that had no results. Resolves https://github.com/pyanodon/pybugreports/issues/1284
     - Added process to automatically set spoil level of spoilable items. Resolves https://github.com/pyanodon/pybugreports/issues/1260
+    - Added py.global_prerequisite_replacer
+    - Updated metas LuaLS
 ---------------------------------------------------------------------------------------------------
 Version: 3.0.39
 Date: 2025-09-15

lib/data-stage.lua

@@ -328,6 +328,34 @@ py.global_item_replacer = function(old, new, blackrecipe)
     end
 end
 
+---replaces every instance of the old prerequesite with the new one. if the new one is omitted, removes the old prerequesite instead
+---@param old string
+---@param new? string
+py.global_prerequisite_replacer = function(old, new)
+  if not data.raw.technology[old] then
+      log("WARNING @ py.global_prerequisite_replacer(): Technology " .. old .. " does not exist")
+      return
+  end
+  if new and not data.raw.technology[new] then
+      log("WARNING @ py.global_prerequisite_replacer(): Technology " .. new .. " does not exist")
+      return
+  end
+  if new then
+    for _, tech in pairs(data.raw.technology) do
+      for i, prereq in pairs(tech.prerequisites or {}) do
+        if prereq == old then
+          tech.prerequisites[i] = new
+          break
+        end
+      end
+    end
+  else -- no need to do fancy checks, just remove it
+    for tech in pairs(data.raw.technology) do
+      TECHNOLOGY(tech):remove_prereq(old)
+    end
+  end
+end
+
 ---adds a small icon to the top right corner of a recipe
 ---@param recipe data.RecipePrototype
 ---@param corner table