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#compdef vmctl

local -a subcommands alts

_vm_names() {
  local expl
  _description virtual-machines expl 'virtual machine'
  compadd "$@" "$expl[@]" - ${${${(@f)"$(_call_program virtual-machines vmctl status)"}[2,-1]}##* }
}

_vm_switches() {
  local expl
  _description virtual-switches expl 'virtual switch'
  [[ -r /etc/vm.conf ]] &&
  compadd "$@" "$expl[@]" - ${${${(M)${(f)"$(</etc/vm.conf)"}:#switch *}##switch ##\"#}%%\"# *}
}

subcommands=(
  console:'connect to the console of the VM'
  create:'create a VM disk image'
  load:'load additional configuration'
  log:'change logging verbosity'
  pause:'pause a VM'
  receive:'receive a VM from stdin'
  reload:'remove stopped VMs and reload config'
  reset:'reset specified component'
  send:'send VM to stdout and terminate it'
  {show,status}:'list VMs running or just the specified id'
  start:'start a VM'
  stop:'stop a VM'
  unpause:'resume a VM'
  wait:'wait until specified VM has stopped'
)

if (( CURRENT == 2 )); then
  _describe subcommand subcommands
else
  local curcontext="${curcontext%:*}-${words[2]}:"
  shift words; (( CURRENT-- ))
  case $words[1] in
    console|pause|send|show|status|unpause|wait)
      _vm_names
      ;;
    create)
      compset -P '(raw|qcow2):' || alts=(
        'prefixes:prefix:compadd -S: raw qcow2'
      )
      _arguments \
        '-s+[specify size]:size' \
        '(-i)-b+[specify base disk]:base image:_files' \
        '(-b)-i+[copy and convert input disk]:disk image:_files' \
        '1:disk: _alternative "files:path:_files" $alts'
      ;;
    load)
      _arguments ':configuration file:_files'
      ;;
    log)
      _arguments ':logging verbosity:(brief verbose)'
      ;;
    receive)
      _arguments ':name: '
      ;;
    reset)
      _arguments ':reset option:((
        all\:"reset the running state"
        switches\:"reset the configured switches"
        vms\:"reset and terminate all VMs"
      ))'
      ;;
    start)
      _arguments -s \
        '-B+[force system to boot from specified device for this boot]:device:(cdrom disk net)' \
        '-b+[boot with the specified kernel or BIOS image]:boot image:_files' \
        '-c[automatically connect to the VM console]' \
        '*-d+[disk image file]:disk image:_files' \
        '-i+[number of network interfaces]:number: ' \
        '-L[add a local network interface]' \
        '-m+[specify memory size]:memory size (megabytes) [512]' \
        '-n+[specify switch to attach]: :_vm_switches' \
        '-r+[specify ISO image file for virtual CD-ROM]:ISO image:_files -g "*.iso(-.)"' \
        '-t+[use existing VM as a template]: :_vm_names' \
        '1: :_vm_names'
    ;;
    stop)
      _arguments \
        '(1)-a[stop all running VMs]' \
        '-f[forcefully stop without attempting a graceful shutdown]' \
        '-w[wait until the VM has been terminated]' \
        '(-a)1: :_vm_names'
    ;;
    *)
      _default
    ;;
  esac
fi