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Variables in scripts

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Posted by

Errigour USA (35 posts) Bio

Date

Thu 17 Jul 2025 08:17 AM (UTC)

Message

I really think it would be a good idea to allow you to use
expand variables when making aliases or triggers etc.. to
define and use variables. Idk if there is a way to do that
without using SetVariable and GetVariable. Like if you use say
@myvariable = 1 and it doesn't exist it should make that
variable. That would be really cool I believe mudlet does
something similar to that accept they just make all your lua
variables part of the worlds variables and then delete them on
close unless you check them with a check box. Thanks for
letting me waste your time.

Example:
@myvariable = 1

if @myvariable == 1 then
-- do something
end

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Posted by Nick Gammon Australia (23,162 posts) Bio Forum Administrator

Date Reply #1 on Thu 17 Jul 2025 09:04 PM (UTC)

Message

There is already something similar to that supplied with MUSHclient. See: https://www.gammon.com.au/forum/?id=4904&reply=6#reply6

You have to put "var." in front of variables that you want saved, eg.


var.gold = 666

print (var.hp)  --> might be nil

This basically uses a Lua table called "var" which is automatically serialized (you still have to save your world file to save the variables).

So, there isn't much difference between putting "@" at the start of the variable you want saved, and putting "var.". You could edit the plugin and make "var" be "v" if you want to save typing.

Quote:

That would be really cool I believe Mudlet does something similar to that accept they just make all your Lua variables part of the worlds variables and then delete them on close unless you check them with a check box.

Well, you could make it that you have a table of variables you want saved, and then automatically serialize those.

For serializing, see: https://www.gammon.com.au/forum/?id=4960

- Nick Gammon

www.gammon.com.au, www.mushclient.com

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Posted by Errigour USA (35 posts) Bio

Date Reply #2 on Fri 18 Jul 2025 11:41 AM (UTC)

Message

This gives an error but I have a variable called cutter.


if var.cutter == "1" then
  Note("No Longer Boarding Cutter.")
  var.cutter = "0"
else
  Note("Boarding Cutter.")
  var.cutter = "1"
end


Run-time error
World: Ethius on Necromium
Immediate execution
[string "Alias: "]:1: attempt to index global 'var' (a nil value)
stack traceback:
        [string "Alias: "]:1: in main chunk

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Posted by

Errigour USA (35 posts) Bio

Date

Reply #3 on Fri 18 Jul 2025 11:44 AM (UTC)

Amended on Fri 18 Jul 2025 11:49 AM (UTC) by Errigour

Message

Oh I see what I did wrong, next time I need to read the posts you suggest first. Ok thanks.

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Posted by

Fiendish USA (2,540 posts) Bio Global Moderator

Date

Reply #4 on Tue 22 Jul 2025 04:11 PM (UTC)

Amended on Tue 22 Jul 2025 04:13 PM (UTC) by Fiendish

Message

Nobody should ever use the feature to expand "@" variables inside a script body. It's just a bad idea because the expansion happens before the script is actually run and it inevitably leads to confusion and broken code. The only safe use is for dynamic match patterns.

https://github.com/fiendish/aardwolfclientpackage

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