From 7810a7ed826363a0ab61ffc2bd2af6ba33bcc6d1 Mon Sep 17 00:00:00 2001
From: Wuzzy <Wuzzy2@mail.ru>
Date: Wed, 4 Sep 2019 14:18:57 +0200
Subject: [PATCH] Turn grass to dirt below slabs and stairs

---
 mods/default/functions.lua  | 6 ++++--
 mods/default/nodes.lua      | 2 +-
 mods/partialblocks/init.lua | 8 +++++++-
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/mods/default/functions.lua b/mods/default/functions.lua
index 2fab400..21800df 100644
--- a/mods/default/functions.lua
+++ b/mods/default/functions.lua
@@ -246,8 +246,9 @@ minetest.register_abm( -- dirt and grass footsteps becomes dirt with grass if un
       action = function(pos, node)
          local above = {x=pos.x, y=pos.y+1, z=pos.z}
          local name = minetest.get_node(above).name
+         local partialblock = minetest.get_item_group(name, "slab") ~= 0 or minetest.get_item_group(name, "stair") ~= 0
          local nodedef = minetest.registered_nodes[name]
-         if nodedef and (nodedef.sunlight_propagates or nodedef.paramtype == "light") and nodedef.liquidtype == "none" and (minetest.get_node_light(above) or 0) >= 8 then
+         if nodedef and (not partialblock) and (nodedef.sunlight_propagates or nodedef.paramtype == "light") and nodedef.liquidtype == "none" and (minetest.get_node_light(above) or 0) >= 8 then
             minetest.set_node(pos, {name = "default:dirt_with_grass"})
          end
       end
@@ -262,8 +263,9 @@ minetest.register_abm( -- dirt with grass becomes dirt if covered
       action = function(pos, node)
          local above = {x=pos.x, y=pos.y+1, z=pos.z}
          local name = minetest.get_node(above).name
+         local partialblock = minetest.get_item_group(name, "slab") ~= 0 or minetest.get_item_group(name, "stair") ~= 0
          local nodedef = minetest.registered_nodes[name]
-         if name ~= "ignore" and nodedef and not ((nodedef.sunlight_propagates or nodedef.paramtype == "light") and nodedef.liquidtype == "none") then
+         if name ~= "ignore" and nodedef and (partialblock) or (not ((nodedef.sunlight_propagates or nodedef.paramtype == "light") and nodedef.liquidtype == "none")) then
             minetest.set_node(pos, {name = "default:dirt"})
          end
       end
diff --git a/mods/default/nodes.lua b/mods/default/nodes.lua
index 787ac1d..dfc507a 100644
--- a/mods/default/nodes.lua
+++ b/mods/default/nodes.lua
@@ -325,7 +325,7 @@ minetest.register_node(
 	 fixed = {-0.5, -0.5, -0.5, 0.5, -2/16, 0.5}
       },
       tiles = {"default_dirt.png"},
-      groups = {crumbly = 3, fall_damage_add_percent = -10},
+      groups = {crumbly = 3, slab = 2, fall_damage_add_percent = -10},
       is_ground_content = false,
       sounds = default.node_sound_dirt_defaults(),
 })
diff --git a/mods/partialblocks/init.lua b/mods/partialblocks/init.lua
index ccdfcc4..e75c062 100644
--- a/mods/partialblocks/init.lua
+++ b/mods/partialblocks/init.lua
@@ -24,8 +24,11 @@ function partialblocks.register_material(name, desc_slab, desc_stair, node, grou
       tiles = nodedef.tiles
    end
    if not groups then
-      groups = nodedef.groups
+      groups = table.copy(nodedef.groups)
+   else
+      groups = {}
    end
+   groups.slab = 1
 
    minetest.register_node(
       "partialblocks:slab_" .. name,
@@ -85,6 +88,9 @@ function partialblocks.register_material(name, desc_slab, desc_stair, node, grou
       tiles = nodedef.tiles
    end
 
+   groups.slab = nil
+   groups.stair = 1
+
    minetest.register_node(
       "partialblocks:stair_" .. name,
       {