Add doc_items support

init.lua

@@ -153,6 +153,32 @@ end
 
 minetest.register_tool("cmdtool:cmdtool", {
 	description = DESCRIPTION,
+	_doc_items_longdesc = "This is a programmable tool which can be used to run server commands.",
+	_doc_items_usagehelp = [[This tool is very mighty, so handle with care!
+Rightclick to set the commands. Write a list of server commands you wish to execute (with one command per line), in that order, but without the trailing slash like in the chat. Confirm with the OK button.
+To run the commands, use the attack key. Note that commands might fail if you lack the required privileges or you made a mistake.
+
+Optionally, you can use the following placeholders to insert variable values into your commands:
+• @playername: Your player name
+• @plx, @ply and @plz: Your player coordinates
+• @@: Literal at sign
+
+These placeholders only work when you use the tool on a block.
+• @ptx, @pty and @ptz: Coordinates of the pointed node (i.e. block)
+• @nodename: Itemstring of the pointed node
+• @param2: param2 of the pointed node
+
+Refer to “Advancd usage > Server commands” to learn more about server commands.
+
+
+Example 1:
+    time 12000
+→ Sets time to midday.
+
+Example 2:
+    teleport @plx 9 @plz
+    giveme default:apple
+→ Teleports you to Y=9 without changing the X and Z coordinates, then gives you an apple.]],
 	inventory_image = "cmdtool_cmdtool.png",
 	wield_imagee = "cmdtool_cmdtool.png",
 	on_use = execute_command,