#compdef scf

_scf() {
    _arguments -s \
        '(-r)-r[Recursively inspect referenced files and directories]' \
        '(-n)-n[Open candidate number directly]:candidate number:' \
        '--[End of options]' \
        '1:systemd service:_scf_services'
}

_scf_services() {
    local -a services

    if (( $+commands[systemctl] )); then
        services=("${(@f)$(systemctl list-unit-files --type=service --no-legend --no-pager 2>/dev/null \
            | awk '$1 ~ /\.service$/ {print $1}' \
            | sort -u)}")
    fi

    if (( ${#services} > 0 )); then
        _describe -t services 'systemd service' services
    else
        _message 'systemd service'
    fi
}

_scf "$@"