bash-it/completion/available/hosts.completion.bash

#!/usr/bin/bash

__hosts_completions()  {
    local OPTS=("add list remove help")
    COMPREPLY=()
    for _opt_ in ${OPTS[@]}; do
        if [[ "$_opt_" == "$2"* ]]; then
            COMPREPLY+=("$_opt_")
        fi
    done
}

complete -F __hosts_completions hosts