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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 (23,070 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 |
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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 |
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The dates and times for posts above are shown in Universal Co-ordinated Time (UTC).
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