You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: syncPatternFinderNSx.m
    path of file: ./repos/fieldtrip/external/npmk/Dependent Functions
    
    the code of the file until where you have to start completion: function codeKeeper = syncPatternFinderNSx(filenameNSx)

% syncPatternFinderNSx
% 
% Canculated the unique 8-bit code and the associated timestamp of the SYNC

    
function codeKeeper = syncPatternFinderNSx(filenameNSx)

% syncPatternFinderNSx
% 
% Canculated the unique 8-bit code and the associated timestamp of the SYNC
% pulse of the NSP. 
%
% Use codeKeeper = syncPatternFinderNSx(filenameNSx)
% 
% All input arguments are optional. Input arguments can be in any order.
%
%   filenameNSx:  Name of the file to be opened. If the fname is omitted
%                 the user will be prompted to select a file. 
%                 DEFAULT: Will open Open File UI.
%
%
%   OUTPUT:       The structure that contains all the unique 8-bit SYNC
%                 pulse codes and their corresponding timestamps.
%
%   Example 1: 
%   codeKeeper = syncPatternFinderNSx('myTestNS5.ns5');
%
%   In the example above, the file myTestNS5.ns5 will be opened and all the
%   SYNC pulses and their corresponding timestamps will be output in the
%   codeKeeper structure. 
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%   Kian Torab
%   kian@blackrockmicro.com
%   Blackrock Microsystems
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% Version History
%
% 1.0.0.0:  November 1, 2014
%   - Initial release.
%
% 1.0.1.0:  March 28, 2015
%   - Fixed a bug where the extension wsan't specified for the file when
%     the input file was not specified.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%% Opening the file to get the header information
if ~exist('filenameNSx', 'var')
    NSx = openNSx('noread');
    % Determining the file name read
    filenameNSx = fullfile(NSx.MetaTags.FilePath, NSx.MetaTags.Filename, NSx.MetaTags.FileExt);
else
    NSx = openNSx(filenameNSx, 'noread');
end