Register a new help entry for a command.
Register a new help entry for a command.
The command info for the command.
The command description for the command
A future that is completed when the command is removed.
Sent to a handler from the help command when a command is unregistered.
Sent to a handler from the help command when a command is unregistered.
The registration info for the command
Sent from the help command when all the commands it's been managing have been unregistered.
Sent from the help command when all the commands it's been managing have
been unregistered. Commands that have the extra property named
ignore-help-last
will be ignored from the consideration of all commands.