From 888b0ebfec8c2eff9015163549a7e47443cb8665 Mon Sep 17 00:00:00 2001
From: Vanessa Ezekowitz <vanessaezekowitz@gmail.com>
Date: Fri, 1 Apr 2016 21:00:20 -0400
Subject: "explode" all modpacks into their individual components (you can't
 have a modpack buried inside a modpack)

---
 worldedit/visualization.lua | 131 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 131 insertions(+)
 create mode 100644 worldedit/visualization.lua

(limited to 'worldedit/visualization.lua')

diff --git a/worldedit/visualization.lua b/worldedit/visualization.lua
new file mode 100644
index 0000000..5ac49f3
--- /dev/null
+++ b/worldedit/visualization.lua
@@ -0,0 +1,131 @@
+--- Functions for visibly hiding nodes
+-- @module worldedit.visualization
+
+minetest.register_node("worldedit:placeholder", {
+	drawtype = "airlike",
+	paramtype = "light",
+	sunlight_propagates = true,
+	diggable = false,
+	walkable = false,
+	groups = {not_in_creative_inventory=1},
+})
+
+--- Hides all nodes in a region defined by positions `pos1` and `pos2` by
+-- non-destructively replacing them with invisible nodes.
+-- @return The number of nodes hidden.
+function worldedit.hide(pos1, pos2)
+	pos1, pos2 = worldedit.sort_pos(pos1, pos2)
+
+	worldedit.keep_loaded(pos1, pos2)
+
+	local pos = {x=pos1.x, y=0, z=0}
+	local get_node, get_meta, swap_node = minetest.get_node,
+			minetest.get_meta, minetest.swap_node
+	while pos.x <= pos2.x do
+		pos.y = pos1.y
+		while pos.y <= pos2.y do
+			pos.z = pos1.z
+			while pos.z <= pos2.z do
+				local node = get_node(pos)
+				if node.name ~= "air" and node.name ~= "worldedit:placeholder" then
+					-- Save the node's original name
+					get_meta(pos):set_string("worldedit_placeholder", node.name)
+					-- Swap in placeholder node
+					node.name = "worldedit:placeholder"
+					swap_node(pos, node)
+				end
+				pos.z = pos.z + 1
+			end
+			pos.y = pos.y + 1
+		end
+		pos.x = pos.x + 1
+	end
+	return worldedit.volume(pos1, pos2)
+end
+
+--- Suppresses all instances of `node_name` in a region defined by positions
+-- `pos1` and `pos2` by non-destructively replacing them with invisible nodes.
+-- @return The number of nodes suppressed.
+function worldedit.suppress(pos1, pos2, node_name)
+	-- Ignore placeholder supression
+	if node_name == "worldedit:placeholder" then
+		return 0
+	end
+
+	pos1, pos2 = worldedit.sort_pos(pos1, pos2)
+
+	worldedit.keep_loaded(pos1, pos2)
+
+	local nodes = minetest.find_nodes_in_area(pos1, pos2, node_name)
+	local get_node, get_meta, swap_node = minetest.get_node,
+			minetest.get_meta, minetest.swap_node
+	for _, pos in ipairs(nodes) do
+		local node = get_node(pos)
+		-- Save the node's original name
+		get_meta(pos):set_string("worldedit_placeholder", node.name)
+		-- Swap in placeholder node
+		node.name = "worldedit:placeholder"
+		swap_node(pos, node)
+	end
+	return #nodes
+end
+
+--- Highlights all instances of `node_name` in a region defined by positions
+-- `pos1` and `pos2` by non-destructively hiding all other nodes.
+-- @return The number of nodes found.
+function worldedit.highlight(pos1, pos2, node_name)
+	pos1, pos2 = worldedit.sort_pos(pos1, pos2)
+
+	worldedit.keep_loaded(pos1, pos2)
+
+	local pos = {x=pos1.x, y=0, z=0}
+	local get_node, get_meta, swap_node = minetest.get_node,
+			minetest.get_meta, minetest.swap_node
+	local count = 0
+	while pos.x <= pos2.x do
+		pos.y = pos1.y
+		while pos.y <= pos2.y do
+			pos.z = pos1.z
+			while pos.z <= pos2.z do
+				local node = get_node(pos)
+				if node.name == node_name then -- Node found
+					count = count + 1
+				elseif node.name ~= "worldedit:placeholder" then -- Hide other nodes
+					-- Save the node's original name
+					get_meta(pos):set_string("worldedit_placeholder", node.name)
+					-- Swap in placeholder node
+					node.name = "worldedit:placeholder"
+					swap_node(pos, node)
+				end
+				pos.z = pos.z + 1
+			end
+			pos.y = pos.y + 1
+		end
+		pos.x = pos.x + 1
+	end
+	return count
+end
+
+-- Restores all nodes hidden with WorldEdit functions in a region defined
+-- by positions `pos1` and `pos2`.
+-- @return The number of nodes restored.
+function worldedit.restore(pos1, pos2)
+	local pos1, pos2 = worldedit.sort_pos(pos1, pos2)
+
+	worldedit.keep_loaded(pos1, pos2)
+
+	local nodes = minetest.find_nodes_in_area(pos1, pos2, "worldedit:placeholder")
+	local get_node, get_meta, swap_node = minetest.get_node,
+			minetest.get_meta, minetest.swap_node
+	for _, pos in ipairs(nodes) do
+		local node = get_node(pos)
+		local meta = get_meta(pos)
+		local data = meta:to_table()
+		node.name = data.fields.worldedit_placeholder
+		data.fields.worldedit_placeholder = nil
+		meta:from_table(data)
+		swap_node(pos, node)
+	end
+	return #nodes
+end
+
-- 
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