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function __fish_mach_complete_no_command
    for i in (commandline -opc)
        if contains -- $i %(commands)s
            return 1
        end
    end
    return 0
end

function __fish_mach_complete_command_matches
    for i in (commandline -opc)
        if contains -- $i %(commands)s
            set com $i
            break
        end
    end

    if not set -q com
        return 1
    end

    if test "$com" != "$argv"
        return 1
    end
    return 0
end

function __fish_mach_complete_command
    __fish_mach_complete_command_matches $argv[1]
    if test $status -ne 0
        return 1
    end

    # If a subcommand is already entered, don't complete, we should defer to
    # '__fish_mach_complete_subcommand'.
    for i in (commandline -opc)
        if contains -- $i $argv[2..-1]
            return 1
        end
    end
    return 0
end

function __fish_mach_complete_subcommand
    __fish_mach_complete_command_matches $argv[1]
    if test $status -ne 0
        return 1
    end

    # Command matches, now check for subcommand
    for i in (commandline -opc)
        if contains -- $i $argv[2]
            return 0
        end
    end
    return 1
end

# global options
%(global_option_completions)s
# commands
%(command_completions)s
# command options
%(command_option_completions)s