Gammon Forum : MUSHclient : General : Checking for an empty variable fails?

Entire forum ➜ MUSHclient ➜ General ➜ Checking for an empty variable fails?

Checking for an empty variable fails?

It is now over 60 days since the last post. This thread is closed. Refresh page

Posted by Winddancer (26 posts) Bio

Date

Tue 07 Feb 2023 06:06 PM (UTC)

Amended on Tue 07 Feb 2023 06:28 PM (UTC) by Winddancer

Message

In my mud, a bard starts singing a song by using the command "singsong" plus a short name of the song, e.g. "singsong ranger" for singing a song about rangers.
To stop an ongoing song, you use the command "singsong" without a parameter.

I tried to write an alias that checks if %1 is empty and then sends "singsong" to the mud, without a parameter to stop the song and "singsong %1" in case I pass a songname to the alias.

Somehow the "singsong" without parameter never gets sent. When %1 is not empty, it works as intended. Any help?


<alias
   match="ss *"
   enabled="y"
   expand_variables="y"
   group="skalds"
   send_to="12"
   sequence="100"
  >
  <send>songWanted = string.lower ("%1")
if songWanted == '' then
  ColourNote ("#FFFF00", "", "End current song")
  Send("singsong")
  return
else
  ColourNote ("#FFFF00", "", "Sing song '" .. "%1" .. "'")
  Send("singsong %1")
end -- if

</send>
</alias>

Here is some sample output to illustrate the point(with command echo active):
Input: ss war
Output in game:
Sing song 'war'
singsong war - echo of command sent to the mud.
You start to sing 'Minstrelboy'.
You hum the melody of 'Minstrelboy'.
Input:
ss - echo of command sent to the mud.
Output in game:
What?

Top

Posted by

Nick Gammon Australia (23,070 posts) Bio Forum Administrator

Date

Reply #1 on Tue 07 Feb 2023 08:24 PM (UTC)

Message

The trigger isn't matching because you are looking for "ss(space)" and typing "ss" on its own does not give the space.

There are various fixes, a simple one is to make two triggers, one matching on "ss *" and the other one matching on "ss".

Alternatively you can make a regular expression and match on: "^ss( .*)?$" which means the wildcard is now optional and it will still match on "ss". However now you have a leading space in the wildcard which you may want to remove (eg. by calling Trim).

- Nick Gammon

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

Top

Posted by

Winddancer (26 posts) Bio

Date

Reply #2 on Tue 07 Feb 2023 09:44 PM (UTC)

Message

Ahh... Thanks. Have overlook that tiny tidbit. *blush*

Top

The dates and times for posts above are shown in Universal Co-ordinated Time (UTC).

To show them in your local time you can join the forum, and then set the 'time correction' field in your profile to the number of hours difference between your location and UTC time.

3,970 views.

It is now over 60 days since the last post. This thread is closed. Refresh page

Go to topic: Search the forum

top