VBoxManage made simple

# Functions for controlling VirtualBox VMs
vm-start() {
    if [ ! "$1" ]; then echo "Missing argument" 1>&2; return 1; fi
    VBoxManage startvm $1 --type headless
}

vm-savestate() {
    if [ ! "$1" ]; then echo "Missing argument" 1>&2; return 1; fi
    VBoxManage controlvm $1 savestate
}

vm-powerbutton() {
    if [ ! "$1" ]; then echo "Missing argument" 1>&2; return 1; fi
    VBoxManage controlvm $1 acpipowerbutton
}

vm-poweroff() {
    if [ ! "$1" ]; then echo "Missing argument" 1>&2; return 1; fi
    echo -n "Do you really want to poweroff $1 ? [y]es/no  "
    read answer
    if [[ "$answer" = "y" || "$answer" = "yes" ]]; then
        VBoxManage controlvm $1 poweroff
    fi
}

alias vm-running='VBoxManage list runningvms'

export VIRTUAL_MACHINES="$(VBoxManage list vms | awk '{print $1;}' | sed 's/"//g' | xargs)"

# Autocompletion
_CompleteVm() {
    local cur prev opts
    COMPREPLY=()
    cur="${COMP_WORDS[COMP_CWORD]}"
    prev="${COMP_WORDS[COMP_CWORD-1]}"

    COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
    return 0
}
complete -F _CompleteVm -W "$VIRTUAL_MACHINES" vm-start vm-savestate vm-powerbutton vm-poweroff