cheater

walls = {}

walls.register = function(wall_name, wall_desc, wall_texture, wall_mat, wall_sounds)
    -- inventory node, and pole-type wall start item
    minetest.register_node(wall_name, {
        description = wall_desc,
        drawtype = "nodebox",
        node_box = {
            type = "connected",
            fixed = {{-1/4, -1/2, -1/4, 1/4, 1/2, 1/4}},
            -- connect_bottom =
            connect_front = {{-3/16, -1/2, -1/2,  3/16, 3/8, -1/4}},
            connect_left = {{-1/2, -1/2, -3/16, -1/4, 3/8,  3/16}},
            connect_back = {{-3/16, -1/2,  1/4,  3/16, 3/8,  1/2}},
            connect_right = {{ 1/4, -1/2, -3/16,  1/2, 3/8,  3/16}},
        },
        connects_to = {"group:wall", "group:stone", "group:fence"},
        paramtype = "light",
        is_ground_content = false,
        tiles = { wall_texture, },
        walkable = true,
        groups = { cracky = 3, wall = 1, stone = 2 },
        sounds = wall_sounds,
        after_place_node = function(pos, placer, itemstack, pointed_thing)
            local pos_under = {x = pos.x, y = pos.y - 1, z = pos.z}
            local pos_above = {x = pos.x, y = pos.y + 1, z = pos.z}
            local node_under = string.gsub(minetest.get_node(pos_under).name, "_full$", "")
            local node_above = string.gsub(minetest.get_node(pos_above).name, "_full$", "")

            if minetest.get_item_group(node_under, "wall") == 1 then
                minetest.set_node(pos_under, {name = node_under .. "_full"})
            end
            if minetest.get_item_group(node_above, "wall") == 1 then
                minetest.set_node(pos, {name = name .. "_full"})
            end
        end,
        after_dig_node = function(pos, oldnode, oldmetadata, digger)
            local pos_under = {x = pos.x, y = pos.y - 1, z = pos.z}
            local node_under = string.gsub(minetest.get_node(pos_under).name, "_full$", "")
            if minetest.get_item_group(node_under, "wall") == 1 and
                    digger and digger:is_player() then
                minetest.set_node(pos_under, {name = node_under})
            end
        end,
    })

    minetest.register_node(wall_name .. "_full", {
        description = wall_desc,
        drawtype = "nodebox",
        paramtype = "light",
        tiles = { wall_texture, },
        groups = {cracky = 3, wall = 1, stone = 2, not_in_creative_inventory = 1},
        node_box = {
            type = "connected",
            fixed = {{-1/4, -1/2, -1/4, 1/4, 1/2, 1/4}},
            connect_front = {{-3/16, -1/2, -1/2,  3/16, 1/2, -1/4}},
            connect_left = {{-1/2, -1/2, -3/16, -1/4, 1/2,  3/16}},
            connect_back = {{-3/16, -1/2,  1/4,  3/16, 1/2,  1/2}},
            connect_right = {{ 1/4, -1/2, -3/16,  1/2, 1/2,  3/16}},
        },
        connects_to = {"group:wall", "group:stone", "group:fence"},
        sounds = wall_sounds,
        drop = name,
        after_dig_node = function(pos, oldnode, oldmetadata, digger)
            local pos_under = {x = pos.x, y = pos.y - 1, z = pos.z}
            local node_under = string.gsub(minetest.get_node(pos_under).name, "_full$", "")
            if minetest.get_item_group(node_under, "wall") == 1 and
                    digger and digger:is_player() then
                minetest.set_node(pos_under, {name = node_under})
            end
        end,
    })

    minetest.register_node(wall_name .. "_filler", {
        description = wall_desc,
        paramtype = "light",
        is_ground_content = false,
        tiles = { wall_texture, },
        walkable = true,
        groups = { cracky = 3, wall = 1, stone = 2 },
        sounds = wall_sounds,
        drawtype = "nodebox",
        node_box = {
            type = "connected",
            fixed = {{-1/2, -1/2, -3/16, 1/2, 3/8, 3/16}},
            connect_top = {{-1/2, -1/2, -3/16, 1/2, 1/2, 3/16}},
        },
        connects_to = {"group:wall", "group:stone", "group:fence"},
    })

    minetest.register_node(wall_name .. "_filler2", {
        description = wall_desc,
        paramtype = "light",
        is_ground_content = false,
        tiles = { wall_texture, },
        walkable = true,
        groups = { cracky = 3, wall = 1, stone = 2 },
        sounds = wall_sounds,
        drawtype = "nodebox",
        node_box = {
            type = "connected",
            fixed = {{-3/16, -1/2, -1/2, 3/16, 3/8, 1/2}},
            connect_top = {{-3/16, -1/2, -1/2, 3/16, 1/2, 1/2}},
        },
        connects_to = {"group:wall", "group:stone", "group:fence"},
    })

    -- crafting recipe
    minetest.register_craft({
        output = wall_name .. " 6",
        recipe = {
            { '', '', '' },
            { wall_mat, wall_mat, wall_mat},
            { wall_mat, wall_mat, wall_mat},
        }
    })

end

walls.register("walls:stone", "Stone Wall", "default_stone.png",
        "default:stone", default.node_sound_stone_defaults())

walls.register("walls:stonebrick", "Stone Brick Wall", "default_stone_brick.png",
        "default:stonebrick", default.node_sound_stone_defaults())

walls.register("walls:stone_block", "Stone Block Wall", "default_stone_block.png",
        "default:stone_block", default.node_sound_stone_defaults())

walls.register("walls:cobble", "Cobblestone Wall", "default_cobble.png",
        "default:cobble", default.node_sound_stone_defaults())

walls.register("walls:mossycobble", "Mossy Cobblestone Wall", "default_mossycobble.png",
        "default:mossycobble", default.node_sound_stone_defaults())

walls.register("walls:desert_stone", "Desert Stone Wall", "default_desert_stone.png",
        "default:desert_stone", default.node_sound_stone_defaults())

walls.register("walls:desert_stonebrick", "Desert Stone Brick Wall", "default_desert_stone_brick.png",
        "default:desert_stonebrick", default.node_sound_stone_defaults())

walls.register("walls:desert_stone_block", "Desert Stone Block Wall", "default_desert_stone_block.png",
        "default:desert_stone_block", default.node_sound_stone_defaults())

walls.register("walls:desertcobble", "Desert Cobblestone Wall", "default_desert_cobble.png",
        "default:desert_cobble", default.node_sound_stone_defaults())

walls.register("walls:sandstone", "Sandstone Wall", "default_sandstone.png",
        "default:sandstone", default.node_sound_stone_defaults())

walls.register("walls:sandstone_brick", "Sandstone Brick Wall", "default_sandstone_brick.png",
        "default:sandstone_brick", default.node_sound_stone_defaults())

walls.register("walls:sandstone_block", "Sandstone Block Wall", "default_sandstone_block.png",
        "default:sandstone_block", default.node_sound_stone_defaults())

walls.register("walls:desert_sandstone", "Desert Sandstone Wall", "default_desert_sandstone.png",
        "default:desert_sandstone", default.node_sound_stone_defaults())

walls.register("walls:desert_sandstone_brick", "Desert Sandstone Brick Wall", "default_desert_sandstone_brick.png",
        "default:desert_sandstone_brick", default.node_sound_stone_defaults())

walls.register("walls:desert_sandstone_block", "Desert Sandstone Block Wall", "default_desert_sandstone_block.png",
        "default:desert_sandstone_block", default.node_sound_stone_defaults())

walls.register("walls:silver_sandstone", "Silver Sandstone Wall", "default_silver_sandstone.png",
        "default:silver_sandstone", default.node_sound_stone_defaults())

walls.register("walls:silver_sandstone_brick", "Silver Sandstone Brick Wall", "default_silver_sandstone_brick.png",
        "default:silver_sandstone_brick", default.node_sound_stone_defaults())

walls.register("walls:silver_sandstone_block", "Silver Sandstone Block Wall", "default_silver_sandstone_block.png",
        "default:silver_sandstone_block", default.node_sound_stone_defaults())

walls.register("walls:obsidian", "Obsidian Wall", "default_obsidian.png",
        "default:obsidian", default.node_sound_stone_defaults())

walls.register("walls:obsidianbrick", "Obsidian Brick Wall", "default_obsidian_brick.png",
        "default:obsidianbrick", default.node_sound_stone_defaults())

walls.register("walls:obsidian_block", "Obsidian Block Wall", "default_obsidian_block.png",
        "default:obsidian_block", default.node_sound_stone_defaults())