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: neuralynx_read_nev.m
    path of file: ./repos/brainstorm3/toolbox/io/private
    
    the code of the file until where you have to start completion: function [nev] = neuralynx_read_nev(filename, varargin)
% READ_NEURALYNX_NEV reads the event information from the *.nev file in a Neuralynx dataset directory
% Use as
%   nev = read_neuralynx_hdr(datadir, ...)
%   nev = read_neuralynx_hdr(eventfile, ...)
%
% Optional input arguments should be specified in key-value pairs and may include
%   implementation  should be 1, 2 or 3 (default = 3)
%   value           number or list of numbers
%   mintimestamp    number
%   maxtimestamp    number
%   minnumber       number
%   maxnumber       number
%
% The output structure contains all events and timestamps.

% @=============================================================================
% This function is part of the Brainstorm software:
% https://neuroimage.usc.edu/brainstorm
% 
% Copyright (c) University of Southern California & McGill University
% This software is distributed under the terms of the GNU General Public License
% as published by the Free Software Foundation. Further details on the GPLv3
% license can be found at http://www.gnu.org/copyleft/gpl.html.
% 
% FOR RESEARCH PURPOSES ONLY. THE SOFTWARE IS PROVIDED "AS IS," AND THE
% UNIVERSITY OF SOUTHERN CALIFORNIA AND ITS COLLABORATORS DO NOT MAKE ANY
% WARRANTY, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTIES OF
% MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, NOR DO THEY ASSUME ANY
% LIABILITY OR RESPONSIBILITY FOR THE USE OF THIS SOFTWARE.
%
% For more information type "brainstorm license" at command prompt.
% =============================================================================@
%
% Copyright (C) 2005, Robert Oostenveld
% 19-Jun-2015 Edited by Francois Tadel for the integration in Brainstorm

% get the optional input arguments
% flt_value        = ft_getopt(varargin, 'value');
% flt_mintimestamp = ft_getopt(varargin, 'mintimestamp');
% flt_maxtimestamp = ft_getopt(varargin, 'maxtimestamp');
% flt_minnumber    = ft_getopt(varargin, 'minnumber');
% flt_maxnumber    = ft_getopt(varargin, 'maxnumber');

    
function [nev] = neuralynx_read_nev(filename, varargin)
% READ_NEURALYNX_NEV reads the event information from the *.nev file in a Neuralynx dataset directory
% Use as
%   nev = read_neuralynx_hdr(datadir, ...)
%   nev = read_neuralynx_hdr(eventfile, ...)
%
% Optional input arguments should be specified in key-value pairs and may include
%   implementation  should be 1, 2 or 3 (default = 3)
%   value           number or list of numbers
%   mintimestamp    number
%   maxtimestamp    number
%   minnumber       number
%   maxnumber       number
%
% The output structure contains all events and timestamps.

% @=============================================================================
% This function is part of the Brainstorm software:
% https://neuroimage.usc.edu/brainstorm
% 
% Copyright (c) University of Southern California & McGill University
% This software is distributed under the terms of the GNU General Public License
% as published by the Free Software Foundation. Further details on the GPLv3
% license can be found at http://www.gnu.org/copyleft/gpl.html.
% 
% FOR RESEARCH PURPOSES ONLY. THE SOFTWARE IS PROVIDED "AS IS," AND THE
% UNIVERSITY OF SOUTHERN CALIFORNIA AND ITS COLLABORATORS DO NOT MAKE ANY
% WARRANTY, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTIES OF
% MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, NOR DO THEY ASSUME ANY
% LIABILITY OR RESPONSIBILITY FOR THE USE OF THIS SOFTWARE.
%
% For more information type "brainstorm license" at command prompt.
% =============================================================================@
%
% Copyright (C) 2005, Robert Oostenveld
% 19-Jun-2015 Edited by Francois Tadel for the integration in Brainstorm

% get the optional input arguments
% flt_value        = ft_getopt(varargin, 'value');
% flt_mintimestamp = ft_getopt(varargin, 'mintimestamp');
% flt_maxtimestamp = ft_getopt(varargin, 'maxtimestamp');
% flt_minnumber    = ft_getopt(varargin, 'minnumber');
% flt_maxnumber    = ft_getopt(varargin, 'maxnumber');
% implementation   = ft_getopt(varargin, 'implementation', 3);
flt_value        = [];
flt_mintimestamp = [];
flt_maxtimestamp = [];
flt_minnumber    = [];
flt_maxnumber    = [];
implementation   = 3;

% if ft_filetype(filename, 'neuralynx_ds')
%   % replace the directory name by the filename
%   if     exist(fullfile(filename, 'Events.Nev'))
%     filename = fullfile(filename, 'Events.Nev');
%   elseif exist(fullfile(filename, 'Events.nev'))
%     filename = fullfile(filename, 'Events.nev');
%   elseif exist(fullfile(filename, 'events.Nev'))
%     filename = fullfile(filename, 'events.Nev');
%   elseif exist(fullfile(filename, 'events.nev'))
%     filename = fullfile(filename, 'events.nev');
%   end