function setvmip --description "Set a VM's Cloud-Init IP"
    if test (count $argv) -lt 2
        echo "Usage: setvmip <vmid> <ip/cidr> [gateway] [ipconfig]"
        return 1
    end

    set -l vmid    $argv[1]
    set -l new_ip  $argv[2]
    set -l new_gw  $argv[3]
    set -l config  $argv[4]

    test -n "$config"; or set config ipconfig0

    set -l qmconfig (qm config "$vmid")

    set -l name (string match -rg '^name: (.*)' $qmconfig)
    set -l current (string match -r "^$config: .*" $qmconfig)

    if test -z "$current"
        echo "Error: $config not found on VM $vmid."
        return 1
    end

    set -l old_ip (string match -rg 'ip=([^, ]+)' $current)
    set -l old_gw (string match -rg 'gw=([^, ]+)' $current)

    test -n "$new_gw"; or set new_gw "$old_gw"

    echo
    printf "VM:      %s (%s)\n" "$vmid" "$name"
    printf "Config:  %s\n" "$config"
    printf "IP:      %s  →  %s\n" "$old_ip" "$new_ip"
    printf "Gateway: %s  →  %s\n" "$old_gw" "$new_gw"
    echo

    read -P "Apply? [y/N]: " confirm

    if not string match -iqr '^y(es)?$' "$confirm"
        echo "Aborted."
        return 0
    end

    qm set "$vmid" --$config "ip=$new_ip,gw=$new_gw"
end