Nicks, short for Nicknames is a system allowing an object (usually a Account) to assign custom replacement names for other game entities.
Nicks are not to be confused with Aliases. Setting an Alias on a game entity actually changes an inherent attribute on that entity, and everyone in the game will be able to use that alias to address the entity thereafter. A Nick on the other hand, is used to map a different way you alone can refer to that entity. Nicks are also commonly used to replace your input text which means you can create your own aliases to default commands.
Default Evennia use Nicks in three flavours that determine when Evennia actually tries to do the substitution.
inputline - replacement is attempted whenever you write anything on the command line. This is the default.
objects - replacement is only attempted when referring to an object
accounts - replacement is only attempted when referring an account
Here’s how to use it in the default command set (using the
nick ls = look
This is a good one for unix/linux users who are accustomed to using the
ls command in their daily
life. It is equivalent to
nick/inputline ls = look.
nick/object mycar2 = The red sports car
With this example, substitutions will only be done specifically for commands expecting an object reference, such as
becomes equivalent to “
look The red sports car”.
nick/accounts tom = Thomas Johnsson
This is useful for commands searching for accounts explicitly:
One can use nicks to speed up input. Below we add ourselves a quicker way to build red buttons. In the future just writing rb will be enough to execute that whole long string.
nick rb = @create button:examples.red_button.RedButton
Nicks could also be used as the start for building a “recog” system suitable for an RP mud.
nick/account Arnold = The mysterious hooded man
The nick replacer also supports unix-style templating:
nick build $1 $2 = @create/drop $1;$2
This will catch space separated arguments and store them in the the tags
$2, to be
inserted in the replacement string. This example allows you to do
build box crate and have Evennia
@create/drop box;crate. You may use any
$ numbers between 1 and 99, but the markers must
match between the nick pattern and the replacement.
If you want to catch “the rest” of a command argument, make sure to put a
$tag with no spaces to the right of it - it will then receive everything up until the end of the line.
You can also use shell-type wildcards:
* - matches everything.
? - matches a single character.
[seq] - matches everything in the sequence, e.g. [xyz] will match both x, y and z
[!seq] - matches everything not in the sequence. e.g. [!xyz] will match all but x,y z.
Coding with nicks¶
Nicks are stored as the
Nick database model and are referred from the normal Evennia
object through the
nicks property - this is known as the NickHandler. The NickHandler
offers effective error checking, searches and conversion.
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# A command/channel nick: obj.nicks.add("greetjack", "tell Jack = Hello pal!") # An object nick: obj.nicks.add("rose", "The red flower", nick_type="object") # An account nick: obj.nicks.add("tom", "Tommy Hill", nick_type="account") # My own custom nick type (handled by my own game code somehow): obj.nicks.add("hood", "The hooded man", nick_type="my_identsystem") # get back the translated nick: full_name = obj.nicks.get("rose", nick_type="object") # delete a previous set nick object.nicks.remove("rose", nick_type="object")
In a command definition you can reach the nick handler through
self.caller.nicks. See the
evennia/commands/default/general.py for more examples.
As a last note, The Evennia channel alias systems are using nicks with the
nick_type="channel" in order to allow users to create their own custom aliases to channels.
Internally, nicks are Attributes saved with the
db_attrype set to “nick” (normal
Attributes has this set to
The nick stores the replacement data in the Attribute.db_value field as a tuple with four fields
(regex_nick, template_string, raw_nick, raw_template). Here
regex_nick is the converted regex
representation of the
raw_nick and the
template-string is a version of the
prepared for efficient replacement of any
$- type markers. The
basically the unchanged strings you enter to the
nick command (with unparsed
If you need to access the tuple for some reason, here’s how:
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tuple = obj.nicks.get("nickname", return_tuple=True) # or, alternatively tuple = obj.nicks.get("nickname", return_obj=True).value