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#compdef softwareupdate

# rebuild cache for available updates everyday (ad hoc)
_softwareupdate_caching_policy() {
  local -a newer=( "$1"(Nmd-1) )
  return $#newer
}

# completes available updates (with description)

_softwareupdate_update_names () {
  local name line update_policy ret=1
  local cache_id=softwareupdate-updates
  zstyle -s ":completion:${curcontext}:" cache-policy update_policy
  if [[ -z "$update_policy" ]]; then
    zstyle ":completion:${curcontext}:" cache-policy \
                                      _softwareupdate_caching_policy
 fi
 if { [[ ! -v _softwareupdate_updates ]] || _cache_invalid $cache_id } &&
    ! _retrieve_cache $cache_id; then
    # Output format of 'softwareupdate --list' seems to be not stable,
    # but at least on macOS 12 and 13 it contains the following two lines
    # for each update:
    #* Label: update name (may contain spaces)
    #        Title: description of the update (single TAB before Title:)
    # softwareupdate(1) manpage says the '*' before the Label: is replaced
    # by '-' for non-recommended updates (but I've never seen it).
    _softwareupdate_updates=()
    for line in ${(f)"$(_call_program updates softwareupdate --list)"}; do
      if [[ $line = [-\*]\ Label:\ (#b)(*) ]]; then
        # add '*' or '-' in front of the name; this will be removed later
        name=$line[1]$match[1]
      elif [[ -n $name && $line = $'\t'Title:\ (#b)(*) ]]; then
        _softwareupdate_updates+=( $name:$match[1] )
        name=
      fi
    done
    _store_cache $cache_id _softwareupdate_updates
  fi
  # recommended and non-recommended updates
  local rec=( ${${_softwareupdate_updates:#-*}#\*} )
  local non=( ${${(M)_softwareupdate_updates:#-*}#-} )
  _describe -t updates "update" rec && ret=0
  _describe -t non-recommended-updates "non-recommended update" non && ret=0
  return ret
}

# completes versions of available macOS full installer (with description)

_softwareupdate_installer_versions () {
  local versions=()
  for line in ${(f)"$(_call_program installer-versions
                        softwareupdate --list-full-installers 2>/dev/null)"}; do
    if [[ $line = \*\ Title:\ *\ Version:\ (#b)([0-9.]##)* ]]; then
      versions+=( ${match[1]}:${line#*Title: } )
    fi
  done
  _describe -t insteller-versions "version" versions
}

# main completion script

_softwareupdate() {
  local -a specs

  if (( ${words[(I)(-i|--install)]} == 0 )); then
    specs=(
      '--no-scan[do not scan when listing or installing updates]'
      '--product-types[limit a scan to a particular product type only]:list of product types'
      '--products[a comma separated list of product keys to operate on]:list of product keys'
      '--force[force an operation to complete]'
      '--agree-to-license[agree to the software license agreement without user interaction]'
      '--verbose[enable verbose output]'
      '(* -)'{-h,--help}'[print command usage]:*:'

      + '(operation)'

      {-l,--list}'[list all available updates]'
      {-d,--download}'[download but not install specified updates]:*: : _softwareupdate_update_names'
      {-i,--install}'[download and install specified updates]'
      '(* -)--list-full-installers[list the available macOS installers]'
      '(* -)--fetch-full-installer[install the latest recommended macOS installer]: :(--full-installer-version): : _softwareupdate_installer_versions'
      '--install-rosetta[install Rosetta 2 (Apple Silicon only)]'
      '(* -)--schedule[returns the per-machine automatic check preference]'
      '--background[trigger a background scan and update operation]'
      '(* -)--dump-state[log the internal state of the SU daemon to /var/log/install.log]'
      '--evaluate-products[evaluate a list of product keys specified by the --products option]'
      '--history[show the install history]'
    )
  else    # if -i/--install is already on the command line
    specs=(
      !{-i,--install}
      '(-R --restart)'{-R,--restart}'[automatically restart if required to complete installation]'
      '--stdinpass[password to authenticate as an owner (Apple Silicon only)]'
      '--user[local username to authenticate as an owner (Apple Silicon only)]'
      '*: : _softwareupdate_update_names'

      + '(select-updates)'

      '(*)'{-a,--all}'[all updates that are applicable to your system]'
      '(*)'{-r,--recommended}'[all updates recommended for your system]'
      '(*)--os-only[only macOS updates]'
      '(*)--safari-only[only Safari updates]'
    )
  fi

  _arguments -s : $specs
}

_softwareupdate "$@"