function __fish_my_function_no_subcommand
    for i in (commandline -opc)
        if contains -- $i command:with:colons hello help list spaced
            return 1
        end
    end
    return 0
end

# global options
complete -c script -n '__fish_my_function_no_subcommand' -l ansi -d 'Force ANSI output.'
complete -c script -n '__fish_my_function_no_subcommand' -l help -d 'Display help for the given command. When no command is given display help for the list command.'
complete -c script -n '__fish_my_function_no_subcommand' -l no-ansi -d 'Disable ANSI output.'
complete -c script -n '__fish_my_function_no_subcommand' -l no-interaction -d 'Do not ask any interactive question.'
complete -c script -n '__fish_my_function_no_subcommand' -l quiet -d 'Do not output any message.'
complete -c script -n '__fish_my_function_no_subcommand' -l verbose -d 'Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug.'
complete -c script -n '__fish_my_function_no_subcommand' -l version -d 'Display this application version.'

# commands
complete -c script -f -n '__fish_my_function_no_subcommand' -a command:with:colons -d 'Test.'
complete -c script -f -n '__fish_my_function_no_subcommand' -a hello -d 'Complete me please.'
complete -c script -f -n '__fish_my_function_no_subcommand' -a help -d 'Displays help for a command.'
complete -c script -f -n '__fish_my_function_no_subcommand' -a list -d 'Lists commands.'
complete -c script -f -n '__fish_my_function_no_subcommand' -a spaced
complete -c script -f -n '__fish_seen_subcommand_from spaced; and not __fish_seen_subcommand_from command' -a command -d 'Command with space in name.'

# command options

# command:with:colons
complete -c script -n '__fish_seen_subcommand_from command:with:colons' -l goodbye -d ''

# hello
complete -c script -n '__fish_seen_subcommand_from hello' -l dangerous-option -d 'This $hould be `escaped`.'
complete -c script -n '__fish_seen_subcommand_from hello' -l option-without-description -d ''

# help

# list

# spaced command
complete -c script -n '__fish_seen_subcommand_from spaced; and __fish_seen_subcommand_from command' -l goodbye -d ''