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[EDIT] FILE: _systemctl

#compdef systemctl
# SPDX-License-Identifier: LGPL-2.1+

(( $+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"
    "suspend-then-hibernate:Suspend the system for a period of time, and then hibernate it"
    "try-reload-or-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"
    "add-wants:Add Wants= dependencies to a unit"
    "add-requires:Add Requires= dependencies to a unit"
    "reenable:Reenable one or more unit files"
    "preset:Enable/disable one or more unit files based on preset configuration"
    "set-default:Set the default target"
    "get-default:Query the default target"
    "edit:Edit one or more unit files"
    "is-system-running:Query overall status of the system"
    "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"
    "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"
    "switch-root:Change root directory"
    "revert:Revert unit files to their vendor versions"
  )

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

cmd="${${_systemctl_cmds[(r)$words[1]:*]%%:*}}"
    # Deal with any aliases
    case $cmd in
      condrestart) cmd="try-restart";;
      force-reload) cmd="try-reload-or-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()
{
  systemctl $_sys_service_mgr --full --no-legend --no-pager "$@" 2>/dev/null
}

# Fills the unit list
_systemctl_all_units()
{
  if ( [[ ${+_sys_all_units} -eq 0 ]] || _cache_invalid SYS_ALL_UNITS$_sys_service_mgr ) ||
    ! _retrieve_cache SYS_ALL_UNITS$_sys_service_mgr;
  then
    _sys_all_units=( ${${(f)"$(__systemctl list-units --all "$PREFIX*" )"}%% *} )
    _store_cache SYS_ALL_UNITS$_sys_service_mgr _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 ( [[ ${+_sys_really_all_units} -eq 0 ]] || _cache_invalid SYS_REALLY_ALL_UNITS$_sys_service_mgr ) ||
    ! _retrieve_cache SYS_REALLY_ALL_UNITS$_sys_service_mgr;
  then
    all_unit_files=( ${${(f)"$(__systemctl list-unit-files "$PREFIX*" )"}%% *} )
    _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_service_mgr _sys_really_all_units
  fi
}

_filter_units_by_property() {
  local property=$1 value=$2; shift 2
  local -a units; units=("${(q-)@}")
  local -A props
  props=(${(f)"$(_call_program units "$service $_sys_service_mgr show --no-pager --property=\"Id,$property\" -- ${units} 2>/dev/null")"})
  echo -E - "${(@g:o:)${(k@)props[(Re)$property=$value]}#Id=}"
}

_systemctl_get_non_template_names() { echo -E - ${^${(R)${(f)"$(
    __systemctl $mode list-unit-files "$PREFIX*"
    __systemctl $mode list-units --all "$PREFIX*"
  )"}:#*@.*}%%[[:space:]]*} }

_systemctl_get_template_names() { echo -E - ${^${(M)${(f)"$(__systemctl list-unit-files "$PREFIX*" )"}##*@.[^[:space:]]##}%%@.*}@ }

_systemctl_active_units()  {_sys_active_units=(  ${${(f)"$(__systemctl list-units "$PREFIX*" )"}%% *} )}

_systemctl_startable_units(){
  _sys_startable_units=( $( _filter_units_by_property ActiveState inactive $(
    _filter_units_by_property CanStart yes ${${${(f)"$(
      __systemctl $mode list-unit-files --state enabled,enabled-runtime,linked,linked-runtime,static,indirect,disabled,generated,transient "$PREFIX*"
      __systemctl $mode list-units --state inactive,failed "$PREFIX*"
    )"}:#*@.*}%%[[:space:]]*}
  )) )
}

_systemctl_restartable_units(){
  _sys_restartable_units=( $( _filter_units_by_property CanStart yes ${${${(f)"$(
    __systemctl $mode list-unit-files --state enabled,disabled,static "$PREFIX*"
    __systemctl $mode list-units "$PREFIX*"
  )"}:#*@.*}%%[[:space:]]*} ) )
}

_systemctl_failed_units()  {_sys_failed_units=( ${${(f)"$(__systemctl list-units --state=failed "$PREFIX*" )"}%% *} ) }
_systemctl_unit_state() { typeset -gA _sys_unit_state; _sys_unit_state=( $(__systemctl list-unit-files "$PREFIX*" ) ) }

local fun
# Completion functions for ALL_UNITS
for fun in cat mask ; do
  (( $+functions[_systemctl_$fun] )) || _systemctl_$fun()
  {
    _systemctl_really_all_units
    _wanted systemd-units expl unit \
      compadd "$@" -a - _sys_really_all_units
  }
done

# Completion functions for NONTEMPLATE_UNITS
for fun in is-active is-failed is-enabled status show preset help list-dependencies edit revert add-wants add-requires ; do
  (( $+functions[_systemctl_$fun] )) || _systemctl_$fun()
  {
    _wanted systemd-units expl unit \
      compadd "$@" - $(_systemctl_get_non_template_names)
  }
done

# Completion functions for ENABLED_UNITS
(( $+functions[_systemctl_disable] )) || _systemctl_disable()
{
    local _sys_unit_state; _systemctl_unit_state
    _wanted systemd-units expl 'enabled unit' \
      compadd "$@" - ${(k)_sys_unit_state[(R)enabled]}
}

(( $+functions[_systemctl_reenable] )) || _systemctl_reenable()
{
    local _sys_unit_state; _systemctl_unit_state
    _wanted systemd-units expl 'enabled/disabled unit' \
      compadd "$@" - ${(k)_sys_unit_state[(R)(enabled|disabled)]} $(_systemctl_get_template_names)
}

# Completion functions for DISABLED_UNITS
(( $+functions[_systemctl_enable] )) || _systemctl_enable()
{
  local _sys_unit_state; _systemctl_unit_state
  _wanted systemd-units expl 'disabled unit' \
    compadd "$@" - ${(k)_sys_unit_state[(R)disabled]} $(_systemctl_get_template_names)
}

# Completion functions for FAILED_UNITS
(( $+functions[_systemctl_reset-failed] )) || _systemctl_reset-failed()
{
  local _sys_failed_units; _systemctl_failed_units
  _wanted systemd-units expl 'failed unit' \
    compadd "$@" -a - _sys_failed_units || _message "no failed unit found"
}

# Completion functions for STARTABLE_UNITS
(( $+functions[_systemctl_start] )) || _systemctl_start()
{
   local _sys_startable_units; _systemctl_startable_units
   _wanted systemd-units expl 'startable unit' \
     compadd "$@" - ${_sys_startable_units[*]}
}

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

# Completion functions for ISOLATABLE_UNITS
(( $+functions[_systemctl_isolate] )) || _systemctl_isolate()
{
  _systemctl_all_units
  _wanted systemd-units expl 'isolatable unit' \
    compadd "$@" - $( _filter_units_by_property AllowIsolate yes \
      ${_sys_all_units[*]} )
}

# Completion functions for RELOADABLE_UNITS
for fun in reload try-reload-or-restart force-reload ; do
  (( $+functions[_systemctl_$fun] )) || _systemctl_$fun()
  {
    local _sys_active_units; _systemctl_active_units
    _wanted systemd-units expl 'reloadable unit' \
      compadd "$@" - $( _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_$fun()
  {
    local _sys_restartable_units; _systemctl_restartable_units
    _wanted systemd-units expl 'restartable unit' \
      compadd "$@" - ${_sys_restartable_units[*]}
  }
done

# Completion functions for MASKED_UNITS
(( $+functions[_systemctl_unmask] )) || _systemctl_unmask()
{
  local _sys_unit_state; _systemctl_unit_state
  _wanted systemd-units expl 'masked unit' \
    compadd "$@" - ${(k)_sys_unit_state[(R)masked]} || _message "no masked units found"
}

# Completion functions for JOBS
(( $+functions[_systemctl_cancel] )) || _systemctl_cancel()
{
  _wanted systemd-jobs expl job \
    compadd "$@" - ${${(f)"$(__systemctl list-jobs)"}%% *} ||
      _message "no jobs found"
}

# Completion functions for TARGETS
(( $+functions[_systemctl_set-default] )) || _systemctl_set-default()
{
  _wanted systemd-targets expl target \
    compadd "$@" - ${${(f)"$(__systemctl list-unit-files --type target --all "$PREFIX*" )"}%% *} ||
      _message "no targets 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 [[ "${fun}" = "set-environment" ]]; then
      suf='-S='
    fi
    _wanted systemd-environment expl 'environment variable' \
      compadd "$@" ${suf} - ${${(f)"$(systemctl show-environment)"}%%=*}
  }
done

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

(( $+functions[_systemctl_switch-root] )) || _systemctl_switch-root() {
   _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'

_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=(${${(f)"$(__systemctl --all)"}%% *})

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

return 1
}

_unit_states() {
    local -a _states
    _states=("${(fo)$(__systemctl --state=help)}")
    _values -s , "${_states[@]}"
}

_unit_types() {
    local -a _types
    _types=("${(fo)$(__systemctl -t help)}")
    _values -s , "${_types[@]}"
}

_unit_properties() {
  if ( [[ ${+_sys_all_properties} -eq 0 ]] || _cache_invalid SYS_ALL_PROPERTIES$_sys_service_mgr ) ||
    ! _retrieve_cache SYS_ALL_PROPERTIES$_sys_service_mgr;
  then
    _sys_all_properties=( ${${(M)${(f)"$(/usr/lib/systemd/systemd --dump-bus-properties)"}}} )
    _store_cache SYS_ALL_PROPERTIES$_sys_service_mgr _sys_all_properties
  fi
  _values -s , "${_sys_all_properties[@]}"
}

_job_modes() {
    local -a _modes
    _modes=(fail replace replace-irreversibly isolate ignore-dependencies ignore-requirements flush)
    _values -s , "${_modes[@]}"
}

(( $+functions[_systemctl_check_inhibitors] )) ||
    _systemctl_check_inhibitors() {
        local -a _modes
        _modes=(auto yes no)
        _values -s , "${_modes[@]}"
    }

# Build arguments for "systemctl" to be used in completion.
local -a _modes; _modes=("--user" "--system")
# Use the last mode (they are exclusive and the last one is used).
local _sys_service_mgr=${${words:*_modes}[(R)(${(j.|.)_modes})]}
_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 specified state]:unit state:_unit_states' \
    '--job-mode=[Specify how to deal with other jobs]:mode:_job_modes' \
    {-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]' \
    {-l,--full}"[Don't ellipsize unit names on output]" \
    '--show-types[When showing sockets, show socket type]' \
    '--check-inhibitors[Specify if inhibitors should be checked]:mode:_systemctl_check_inhibitors' \
    {-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/mask 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/disable/mask unit files in the specified root directory]:directory:_directories' \
    '--runtime[Enable/disable/mask 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' \
    '--firmware-setup[Tell the firmware to show the setup menu on next boot]' \
    '--plain[When used with list-dependencies, print output as a list]' \
    '--failed[Show failed units]' \
    '*::systemctl command:_systemctl_command'

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