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_commands/safe.lua | 68 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 worldedit_commands/safe.lua

(limited to 'worldedit_commands/safe.lua')

diff --git a/worldedit_commands/safe.lua b/worldedit_commands/safe.lua
new file mode 100644
index 0000000..e640853
--- /dev/null
+++ b/worldedit_commands/safe.lua
@@ -0,0 +1,68 @@
+local safe_region_callback = {}
+local safe_region_param = {}
+
+local function check_region(name, param)
+	local pos1, pos2 = worldedit.pos1[name], worldedit.pos2[name] --obtain positions
+	if pos1 == nil or pos2 == nil then
+		worldedit.player_notify(name, "no region selected")
+		return nil
+	end
+	return worldedit.volume(pos1, pos2)
+end
+
+--`callback` is a callback to run when the user confirms
+--`nodes_needed` is a function accepting `param`, `pos1`, and `pos2` to calculate the number of nodes needed
+local function safe_region(callback, nodes_needed)
+	--default node volume calculation
+	nodes_needed = nodes_needed or check_region
+
+	return function(name, param)
+		--check if the operation applies to a safe number of nodes
+		local count = nodes_needed(name, param)
+		if count == nil then return end --invalid command
+		if count < 10000 then
+			return callback(name, param)
+		end
+
+		--save callback to call later
+		safe_region_callback[name], safe_region_param[name] = callback, param
+		worldedit.player_notify(name, "WARNING: this operation could affect up to " .. count .. " nodes; type //y to continue or //n to cancel")
+	end
+end
+
+minetest.register_chatcommand("/y", {
+	params = "",
+	description = "Confirm a pending operation",
+	func = function(name)
+		local callback, param = safe_region_callback[name], safe_region_param[name]
+		if not callback then
+			worldedit.player_notify(name, "no operation pending")
+			return
+		end
+
+		--obtain positions
+		local pos1, pos2 = worldedit.pos1[name], worldedit.pos2[name]
+		if pos1 == nil or pos2 == nil then
+			worldedit.player_notify(name, "no region selected")
+			return
+		end
+
+		safe_region_callback[name], safe_region_param[name] = nil, nil --reset pending operation
+		callback(name, param, pos1, pos2)
+	end,
+})
+
+minetest.register_chatcommand("/n", {
+	params = "",
+	description = "Confirm a pending operation",
+	func = function(name)
+		if not safe_region_callback[name] then
+			worldedit.player_notify(name, "no operation pending")
+			return
+		end
+		safe_region_callback[name], safe_region_param[name] = nil, nil
+	end,
+})
+
+return safe_region, check_region
+
-- 
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