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commands: panic on duplicate registration

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Tulir Asokan 2025-05-02 01:56:46 +03:00
commit e491e87309
1 changed files with 8 additions and 0 deletions
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8
commands/container.go
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@ -40,11 +40,19 @@ func (cont *CommandContainer[MetaType]) Register(handlers ...*Handler[MetaType])
func (cont *CommandContainer[MetaType]) registerOne(handler *Handler[MetaType]) {
if strings.ToLower(handler.Name) != handler.Name {
panic(fmt.Errorf("command %q is not lowercase", handler.Name))
} else if val, alreadyExists := cont.commands[handler.Name]; alreadyExists && val != handler {
panic(fmt.Errorf("tried to register command %q, but it's already registered", handler.Name))
} else if aliasTarget, alreadyExists := cont.aliases[handler.Name]; alreadyExists {
panic(fmt.Errorf("tried to register command %q, but it's already registered as an alias for %q", handler.Name, aliasTarget))
}
cont.commands[handler.Name] = handler
for _, alias := range handler.Aliases {
if strings.ToLower(alias) != alias {
panic(fmt.Errorf("alias %q is not lowercase", alias))
} else if val, alreadyExists := cont.aliases[alias]; alreadyExists && val != handler.Name {
panic(fmt.Errorf("tried to register alias %q for %q, but it's already registered for %q", alias, handler.Name, cont.aliases[alias]))
} else if _, alreadyExists = cont.commands[alias]; alreadyExists {
panic(fmt.Errorf("tried to register alias %q for %q, but it's already registered as a command", alias, handler.Name))
}
cont.aliases[alias] = handler.Name
}