Add support for stack_max

doc/functions.md

@@ -14,3 +14,18 @@ supports
 
 * minetest game default if present
 * else polyfill
+
+## `get_default_stack_max()`
+
+returns `number`
+
+checks the current game against a table of games with their default stack_max
+
+supports
+
+* minetest game
+* mineclonia
+* farlands reloaded
+* hades revisited
+* exile
+* devtest

src/functions.lua

@@ -52,4 +52,18 @@ function functions.sapling_on_place(
 	return itemstack
 end
 
-return functions
+function functions.get_default_stack_max()
+    local game_stack_table = {
+        -- Only include games that use a different default stack_max
+        mineclonia = 64,
+        exile = 288,
+    }
+    for game, stack in pairs(game_stack_table) do
+        if game == xcompat.gameid then
+            return stack
+        end
+    end
+    return tonumber(core.settings:get("default_stack_max")) or 99
+end
+
+return functions