#compdef systemctl

(( $+functions[_systemctl_command] )) || _systemctl_command()
{
  local -a _systemctl_cmds
  _systemctl_cmds=(
    "list-sockets:List sockets"
    "list-timers:List timers"
    "list-units:List units"
    "start:Start (activate) one or more units"
    "stop:Stop (deactivate) one or more units"
    "reload:Reload one or more units"
    "restart:Start or restart one or more units"
    "condrestart:Restart one or more units if active"
    "try-restart:Restart one or more units if active"
    "reload-or-restart:Reload one or more units if possible, otherwise start or restart"
    "force-reload:Reload one or more units if possible, otherwise restart if active"
    "hibernate:Hibernate the system"
    "hybrid-sleep:Hibernate and suspend the system"
    "reload-or-try-restart:Reload one or more units if possible, otherwise restart if active"
    "isolate:Start one unit and stop all others"
    "kill:Send signal to processes of a unit"
    "is-active:Check whether units are active"
    "is-failed:Check whether units are failed"
    "status:Show runtime status of one or more units"
    "show:Show properties of one or more units/jobs or the manager"
    "cat:Show the source unit files and drop-ins"
    "reset-failed:Reset failed state for all, one, or more units"
    "list-unit-files:List installed unit files"
    "enable:Enable one or more unit files"
    "disable:Disable one or more unit files"
    "reenable:Reenable one or more unit files"
    "preset:Enable/disable one or more unit files based on preset configuration"
    "help:Show documentation for specified units"
    "list-dependencies:Show unit dependency tree"
    "mask:Mask one or more units"
    "unmask:Unmask one or more units"
    "link:Link one or more units files into the search path"
    "is-enabled:Check whether unit files are enabled"
    "list-jobs:List jobs"
    "cancel:Cancel all, one, or more jobs"
    "snapshot:Create a snapshot"
    "delete:Remove one or more snapshots"
    "show-environment:Dump environment"
    "set-environment:Set one or more environment variables"
    "unset-environment:Unset one or more environment variables"
    "daemon-reload:Reload systemd manager configuration"
    "daemon-reexec:Reexecute systemd manager"
    "default:Enter system default mode"
    "rescue:Enter system rescue mode"
    "emergency:Enter system emergency mode"
    "halt:Shut down and halt the system"
    "suspend:Suspend the system"
    "poweroff:Shut down and power-off the system"
    "reboot:Shut down and reboot the system"
    "kexec:Shut down and reboot the system with kexec"
    "exit:Ask for user instance termination"
  )

  if (( CURRENT == 1 )); then
    _describe -t commands 'systemctl command' _systemctl_cmds || compadd "$@"
  else
    local curcontext="$curcontext"

    cmd="${${_systemctl_cmds[(r)$words[1]:*]%%:*}}"
    # Deal with any aliases
    case $cmd in
      condrestart) cmd="try-restart";;
      force-reload) cmd="reload-or-try-restart";;
    esac

    if (( $#cmd )); then
      curcontext="${curcontext%:*:*}:systemctl-${cmd}:"

      local update_policy
      zstyle -s ":completion:${curcontext}:" cache-policy update_policy
      if [[ -z "$update_policy" ]]; then
        zstyle ":completion:${curcontext}:" cache-policy _systemctl_caching_policy
      fi

      _call_function ret _systemctl_$cmd || _message 'no more arguments'
    else
      _message "unknown systemctl command: $words[1]"
    fi
    return ret
  fi
}

__systemctl()
{
  local -a _modes
  _modes=("--user" "--system")
  systemctl ${words:*_modes} --full --no-legend --no-pager "$@"
}


# Fills the unit list
_systemctl_all_units()
{
  if ( [[ ${+_sys_all_units} -eq 0 ]] || _cache_invalid SYS_ALL_UNITS ) &&
    ! _retrieve_cache SYS_ALL_UNITS;
  then
    _sys_all_units=( $(__systemctl list-units --all | { while read a b; do echo " $a"; done; }) )
    _store_cache SYS_ALL_UNITS _sys_all_units
  fi
}

# Fills the unit list including all file units
_systemctl_really_all_units()
{
  local -a all_unit_files;
  local -a really_all_units;
  if ( [[ ${+_sys_really_all_units} -eq 0 ]] || _cache_invalid SYS_REALLY_ALL_UNITS ) &&
    ! _retrieve_cache SYS_REALLY_ALL_UNITS;
  then
    all_unit_files=( $(__systemctl list-unit-files | { while read a b; do echo " $a"; done; }) )
    _systemctl_all_units
    really_all_units=($_sys_all_units $all_unit_files)
    _sys_really_all_units=(${(u)really_all_units})
    _store_cache SYS_REALLY_ALL_UNITS _sys_really_all_units
  fi
}

_filter_units_by_property() {
  local property=$1 value=$2 ; shift ; shift
  local -a units ; units=($*)
  local prop unit
  for ((i=1; $i <= ${#units[*]}; i++)); do
    # FIXME: "Failed to issue method call: Unknown unit" errors are ignored for
    # now (related to DBUS_ERROR_UNKNOWN_OBJECT). in the future, we need to
    # revert to calling 'systemctl show' once for all units, which is way
    # faster
    unit=${units[i]}
    prop=${(f)"$(_call_program units "$service show --no-pager --property="$property" ${unit} 2>/dev/null")"}
    if [[ "${prop}" = "$property=$value" ]]; then
      echo " ${unit}"
    fi
  done
}

_systemctl_active_units()  {_sys_active_units=(  $(__systemctl list-units          | { while read a b; do echo " $a"; done; }) )}
_systemctl_inactive_units(){_sys_inactive_units=($(__systemctl list-units --all    | { while read a b c d; do [[ $c == "inactive" || $c == "failed" ]] && echo " $a"; done; }) )}
_systemctl_failed_units()  {_sys_failed_units=(  $(__systemctl list-units --failed | { while read a b; do echo " $a"; done; }) )}
_systemctl_enabled_units() {_sys_enabled_units=( $(__systemctl list-unit-files     | { while read a b; do [[ $b == "enabled" ]] && echo " $a"; done; }) )}
_systemctl_disabled_units(){_sys_disabled_units=($(__systemctl list-unit-files     | { while read a b; do [[ $b == "disabled" ]] && echo " $a"; done; }) )}
_systemctl_masked_units()  {_sys_masked_units=(  $(__systemctl list-unit-files     | { while read a b; do [[ $b == "masked" ]] && echo " $a"; done; }) )}

# Completion functions for ALL_UNITS
for fun in is-active is-failed is-enabled status show cat mask preset help list-dependencies ; do
  (( $+functions[_systemctl_$fun] )) || _systemctl_$fun()
  {
    _systemctl_really_all_units
    compadd "$@" -a - _sys_really_all_units
  }
done

# Completion functions for ENABLED_UNITS
for fun in disable reenable ; do
  (( $+functions[_systemctl_$fun] )) || _systemctl_$fun()
  {
    _systemctl_enabled_units
    _systemctl_disabled_units
    compadd "$@" -a - _sys_enabled_units _sys_disabled_units
  }
done

# Completion functions for DISABLED_UNITS
(( $+functions[_systemctl_enable] )) || _systemctl_enable()
{
  _systemctl_disabled_units
  compadd "$@" -a - _sys_disabled_units
}

# Completion functions for FAILED_UNITS
(( $+functions[_systemctl_reset-failed] )) || _systemctl_reset-failed()
{
  _systemctl_failed_units
  compadd "$@" -a - _sys_failed_units || _message "no failed unit found"
}

# Completion functions for STARTABLE_UNITS
(( $+functions[_systemctl_start] )) || _systemctl_start()
{
  _systemctl_inactive_units
  compadd "$@" -a - _sys_inactive_units
}

# Completion functions for STOPPABLE_UNITS
for fun in stop kill try-restart condrestart ; do
  (( $+functions[_systemctl_$fun] )) || _systemctl_$fun()
  {
    _systemctl_active_units
    compadd "$@" - $( _filter_units_by_property CanStop yes \
      ${_sys_active_units[*]} )
  }
done

# Completion functions for ISOLATABLE_UNITS
(( $+functions[_systemctl_isolate] )) || _systemctl_isolate()
{
  _systemctl_all_units
  compadd "$@" - $( _filter_units_by_property AllowIsolate yes \
    ${_sys_all_units[*]} )
}

# Completion functions for RELOADABLE_UNITS
for fun in reload reload-or-try-restart force-reload ; do
  (( $+functions[_systemctl_$fun] )) || _systemctl_$fun()
  {
    _systemctl_active_units
    compadd "$@" - $( _filter_units_by_property CanReload yes \
      ${_sys_active_units[*]} )
  }
done

# Completion functions for RESTARTABLE_UNITS
for fun in restart reload-or-restart ; do
  (( $+functions[_systemctl_$fun] )) || _systemctl_$fun()
  {
    _systemctl_all_units
    compadd "$@" - $( _filter_units_by_property CanStart yes \
      ${_sys_all_units[*]} | while read line; do \
      [[ "$line" =~ \.device$ ]] || echo " $line"; \
      done )
  }
done

# Completion functions for MASKED_UNITS
(( $+functions[_systemctl_unmask] )) || _systemctl_unmask()
{
  _systemctl_masked_units
  compadd "$@" -a - _sys_masked_units || _message "no masked unit found"
}

# Completion functions for JOBS
(( $+functions[_systemctl_cancel] )) || _systemctl_cancel()
{
  compadd "$@" - $(__systemctl list-jobs \
    | cut -d' ' -f1  2>/dev/null ) || _message "no job found"
}

# Completion functions for SNAPSHOTS
(( $+functions[_systemctl_delete] )) || _systemctl_delete()
{
  compadd "$@" - $(__systemctl list-units --type snapshot --all \
    | cut -d' ' -f1  2>/dev/null ) || _message "no snapshot found"
}

# Completion functions for ENVS
for fun in set-environment unset-environment ; do
  (( $+functions[_systemctl_$fun] )) || _systemctl_$fun()
  {
    local fun=$0 ; fun=${fun##_systemctl_}
    local suf
    if [[ "${fun}" = "set-environment" ]]; then
      suf='-S='
    fi

    compadd "$@" ${suf} - $(systemctl show-environment \
      | while read line; do echo " ${line%%\=}";done )
  }
done

(( $+functions[_systemctl_link] )) || _systemctl_link() { _files }

# no systemctl completion for:
#    [STANDALONE]='daemon-reexec daemon-reload default
#                  emergency exit halt kexec list-jobs list-units
#                  list-unit-files poweroff reboot rescue show-environment'
#         [NAME]='snapshot'

_systemctl_caching_policy()
{
  local _sysunits
  local -a oldcache

  # rebuild if cache is more than a day old
  oldcache=( "$1"(mh+1) )
  (( $#oldcache )) && return 0

  _sysunits=($(__systemctl --all | cut -d' ' -f1))

  if (( $#_sysunits )); then
    for unit in $_sysunits; do
      [[ "$unit" -nt "$1" ]] && return 0
    done
  fi

  return 1
}

_unit_states() {
    local -a _states
    _states=(loaded failed active inactive not-found listening running waiting plugged mounted exited dead masked)
    _values -s , "${_states[@]}"
}

_unit_types() {
    local -a _types
    _types=(automount device mount path service snapshot socket swap target timer)
    _values -s , "${_types[@]}"
}

_unit_properties() {
  if ( [[ ${+_sys_all_properties} -eq 0 ]] || _cache_invalid SYS_ALL_PROPERTIES ) &&
    ! _retrieve_cache SYS_ALL_PROPERTIES;
  then
    _sys_all_properties=( $( {__systemctl show --all;
       @rootlibexecdir@/systemd --dump-configuration-items; } | {
       while IFS='=' read -r a b; do [ -n "$b" ] && echo "$a"; done
    }) )
    _store_cache SYS_ALL_PROPRTIES _sys_all_properties
  fi
  _values -s , "${_sys_all_properties[@]}"
}

_arguments -s \
    {-h,--help}'[Show help]' \
    '--version[Show package version]' \
    {-t+,--type=}'[List only units of a particular type]:unit type:_unit_types' \
    '--state=[Display units in the specifyied state]:unit state:_unit_states' \
    {-p+,--property=}'[Show only properties by specific name]:unit property:_unit_properties' \
    {-a,--all}'[Show all units/properties, including dead/empty ones]' \
    '--reverse[Show reverse dependencies]' \
    '--after[Show units ordered after]' \
    '--before[Show units ordered before]' \
    '--failed[Show only failed units]' \
    {-l,--full}"[Don't ellipsize unit names on output]" \
    '--fail[When queueing a new job, fail if conflicting jobs are pending]' \
    '--show-types[When showing sockets, show socket type]' \
    '--irreversible[Mark transactions as irreversible]' \
    '--ignore-dependencies[When queueing a new job, ignore all its dependencies]' \
    {-i,--ignore-inhibitors}'[When executing a job, ignore jobs dependencies]' \
    {-q,--quiet}'[Suppress output]' \
    '--no-block[Do not wait until operation finished]' \
    '--no-legend[Do not print a legend, i.e. the column headers and the footer with hints]' \
    '--no-pager[Do not pipe output into a pager]' \
    '--system[Connect to system manager]' \
    '--user[Connect to user service manager]' \
    "--no-wall[Don't send wall message before halt/power-off/reboot]" \
    '--global[Enable/disable unit files globally]' \
    "--no-reload[When enabling/disabling unit files, don't reload daemon configuration]" \
    '--no-ask-password[Do not ask for system passwords]' \
    '--kill-who=[Who to send signal to]:killwho:(main control all)' \
    {-s+,--signal=}'[Which signal to send]:signal:_signals' \
    {-f,--force}'[When enabling unit files, override existing symlinks. When shutting down, execute action immediately]' \
    '--root=[Enable unit files in the specified root directory]:directory:_directories' \
    '--runtime[Enable unit files only temporarily until next reboot]' \
    {-H+,--host=}'[Operate on remote host]:userathost:_sd_hosts_or_user_at_host' \
    {-P,--privileged}'[Acquire privileges before execution]' \
    {-n+,--lines=}'[Journal entries to show]:number of entries' \
    {-o+,--output=}'[Change journal output mode]:modes:_sd_outputmodes' \
    '--plain[When used with list-dependencies, print output as a list]' \
    '*::systemctl command:_systemctl_command'
