Minetest-WorldEditAdditions/worldeditadditions_commands/commands/extra/saplingaliases.lua

local wea_c = worldeditadditions_core

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minetest.register_chatcommand("/saplingaliases", {
	params = "[aliases|all_saplings]",
	description = "Lists all the currently registered sapling aliases (default). A single argument is taken as the mode of operation. Current modes: aliases (default; as described previously), all_saplings (lists all node names with the group \"sapling\")",
	privs = { worldedit = true },
	func = function(name, params_text)
		if name == nil then return end
		if params_text == "" or not params_text then
			params_text = "aliases"
		end
		
		local msg = {}
		
		local mode = "info"
		
		if params_text == "aliases" then
			table.insert(msg, "Currently registered aliases:\n")
			local aliases = wea_c.get_all_sapling_aliases()
			local display = {}
			for node_name, alias in pairs(aliases) do
				table.insert(display, { node_name, alias })
			end
			table.sort(display, function(a, b) return a[2] < b[2] end)
			table.insert(msg, wea_c.format.make_ascii_table(display))
		elseif params_text == "all_saplings" then
			local results = wea_c.registered_nodes_by_group("sapling")
			table.insert(msg, "Sapling-like nodes:\n")
			local str = table.concat(results, "\n")
			table.insert(msg, str)
		else
			mode = "error"
			table.insert(msg, "Unknown mode '")
			table.insert(msg, params_text)
			table.insert(msg, "' (valid modes: aliases, all_saplings).")
		end
		
		-- Don't forget to update this 
		wea_c.notify(name, mode, table.concat(msg))
	end
})