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worldeditadditions_core.register_command("erode", {
	params = "[<snowballs|river> [<key_1> [<value_1>]] [<key_2> [<value_2>]] ...]",
	description = "**experimental** Runs the specified erosion algorithm over the given defined region. This may occur in 2d or 3d. Currently implemented algorithms: snowballs (default;2d hydraulic-like). Also optionally takes an arbitrary set of key - value pairs representing parameters to pass to the algorithm. See the full documentation for details.",
	privs = { worldedit = true },
	require_pos = 2,
	parse = function(params_text)
		if not params_text or params_text == "" then
			return true, "snowballs", {}
		end
		
		if params_text:find("%s") == nil then
			return true, params_text, {}
		end
		
		local algorithm, params = params_text:match("([^%s]+)%s(.+)")
		if algorithm == nil then
			return false, "Failed to split params_text into 2 parts (this is probably a bug)"
		end
		
		local success, map = worldeditadditions.parse.map(params)
		if not success then return success, map end
		return true, algorithm, map
	end,
	nodes_needed = function(name)
		return worldedit.volume(worldedit.pos1[name], worldedit.pos2[name])
	end,
	func = function(name, algorithm, params)
		local start_time = worldeditadditions.get_ms_time()
		local success, msg, stats = worldeditadditions.erode.run(
			worldedit.pos1[name], worldedit.pos2[name],
			algorithm, params
		)
		if not success then return success, msg end
		local time_taken = worldeditadditions.get_ms_time() - start_time
		
		minetest.log("action", name .. " used //erode "..algorithm.." at " .. worldeditadditions.vector.tostring(worldedit.pos1[name]) .. ", adding " .. stats.added .. " nodes and removing " .. stats.removed .. " nodes in " .. time_taken .. "s")
		return true, msg.."\n"..stats.added .. " nodes added and " .. stats.removed .. " nodes removed in " .. worldeditadditions.format.human_time(time_taken)
	end
})