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➜ MUSHclient
➜ General
➜ Checking for an empty variable fails?
Checking for an empty variable fails?
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Posted by
| Winddancer
(26 posts) Bio
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Date
| Tue 07 Feb 2023 06:06 PM (UTC) Amended on Tue 07 Feb 2023 06:28 PM (UTC) by Winddancer
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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 |
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Posted by
| Nick Gammon
Australia (23,097 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 |
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Posted by
| Winddancer
(26 posts) Bio
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Date
| Reply #2 on Tue 07 Feb 2023 09:44 PM (UTC) |
Message
| Ahh... Thanks. Have overlook that tiny tidbit. *blush* | Top |
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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.
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