Add extended tooltip

init.lua

@@ -1,8 +1,31 @@
 local NEWLINE = "\n"
+local DESCRIPTION = "Command Tool"
+local MAX_CMD_TOOLTIP_LEN = 48
+
+local split_commands = function(commands_string)
+	return string.split(commands_string, NEWLINE)
+end
 
 local set_commands = function(itemstack, commands_string)
 	local meta = itemstack:get_meta()
 	meta:set_string("cmd", commands_string)
+	local cmds = split_commands(commands_string)
+	local first_cmd
+	if #cmds >= 1 then
+		first_cmd = cmds[1]
+		if string.len(first_cmd) > MAX_CMD_TOOLTIP_LEN then
+			first_cmd = string.sub(first_cmd, 1, MAX_CMD_TOOLTIP_LEN) .. " (…)"
+		end
+		local tooltip = DESCRIPTION .. NEWLINE .. first_cmd
+		if #cmds == 2 then
+			tooltip = tooltip .. NEWLINE .. string.format("… and %d more command", #cmds - 1)
+		elseif #cmds > 2 then
+			tooltip = tooltip .. NEWLINE .. string.format("… and %d more commands", #cmds - 1)
+		end
+		meta:set_string("description", tooltip)
+	else
+		meta:set_string("description", "")
+	end
 	return itemstack
 end
 
@@ -10,7 +33,7 @@ end
 local get_commands = function(itemstack)
 	local meta = itemstack:get_meta()
 	local cmd_str = meta:get_string("cmd")
-	local cmds = string.split(cmd_str, NEWLINE)
+	local cmds = split_commands(cmd_str)
 	return cmds
 end
 
@@ -74,14 +97,14 @@ local open_command_configuration = function(itemstack, player, pointed_thing)
 	end
 	local formspec =
 			"size[6,6]"..
-			"textarea[0.25,0;6,4;commands;Commands:;"..minetest.formspec_escape(commands_str).."]"..
+			"textarea[0.25,0;6,5;commands;Commands:;"..minetest.formspec_escape(commands_str).."]"..
 			"button_exit[0.5,5;2,1;ok;OK]"..
 			"button_exit[3.5,5;2,1;cancel;Cancel]"
 	minetest.show_formspec(player_name, "cmdtool", formspec)
 end
 
 minetest.register_tool("cmdtool:cmdtool", {
-	description = "Command Tool",
+	description = DESCRIPTION,
 	inventory_image = "cmdtool_cmdtool.png",
 	wield_imagee = "cmdtool_cmdtool.png",
 	on_use = execute_command,