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: ft_read_spike.m
    path of file: ./repos/malini/Codes/deconvolution - model/spm8/external/fieldtrip/fileio
    
    the code of the file until where you have to start completion: function [spike] = ft_read_spike(filename, varargin)

% FT_READ_SPIKE reads spike timestamps and waveforms from various data
% formats.
%
% Use as
%  [spike] = ft_read_spike(filename, ...)
%
% Additional options should be specified in key-value pairs and can be
%   'spikeformat' = string, described the fileformat (default is automatic)
%
% The following file formats are supported
%   'mclust_t'
%   'neuralynx_ncs' 
%   'neuralynx_nse'
%   'neuralynx_nst'
%   'neuralynx_ntt'
%   'neuralynx_nts'
%   'plexon_ddt'
%   'plexon_nex'
%   'plexon_plx'
%   'neuroshare'
%   'neurosim_spikes'
%
% The output spike structure usually contains
%   spike.label     = 1xNchans cell-array, with channel labels
%   spike.waveform  = 1xNchans cell-array, each element contains a matrix (Nleads x Nsamples X Nspikes)
%   spike.waveformdimord = '{chan}_lead_time_spike'
%   spike.timestamp = 1xNchans cell-array, each element contains a vector (1 X Nspikes)
%   spike.unit      = 1xNchans cell-array, each element contains a vector (1 X Nspikes)
% and is described in more detail in FT_DATATYPE_SPIKE
%
% See also FT_DATATYPE_SPIKE, FT_READ_HEADER, FT_READ_DATA, FT_READ_EVENT

% Copyright (C) 2007-2011 Robert Oostenveld
%
% This file is part of FieldTrip, see http://www.ru.nl/neuroimaging/fieldtrip
% for the documentation and details.
%
%    FieldTrip is free software: you can redistribute it and/or modify
%    it under the terms of the GNU General Public License as published by
%    the Free Software Foundation, either version 3 of the License, or
%    (at your option) any later version.
%
%    FieldTrip is distributed in the hope that it will be useful,
%    but WITHOUT ANY WARRANTY; without even the implied warranty of
%    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
%    GNU General Public License for more details.
%

    
function [spike] = ft_read_spike(filename, varargin)

% FT_READ_SPIKE reads spike timestamps and waveforms from various data
% formats.
%
% Use as
%  [spike] = ft_read_spike(filename, ...)
%
% Additional options should be specified in key-value pairs and can be
%   'spikeformat' = string, described the fileformat (default is automatic)
%
% The following file formats are supported
%   'mclust_t'
%   'neuralynx_ncs' 
%   'neuralynx_nse'
%   'neuralynx_nst'
%   'neuralynx_ntt'
%   'neuralynx_nts'
%   'plexon_ddt'
%   'plexon_nex'
%   'plexon_plx'
%   'neuroshare'
%   'neurosim_spikes'
%
% The output spike structure usually contains
%   spike.label     = 1xNchans cell-array, with channel labels
%   spike.waveform  = 1xNchans cell-array, each element contains a matrix (Nleads x Nsamples X Nspikes)
%   spike.waveformdimord = '{chan}_lead_time_spike'
%   spike.timestamp = 1xNchans cell-array, each element contains a vector (1 X Nspikes)
%   spike.unit      = 1xNchans cell-array, each element contains a vector (1 X Nspikes)
% and is described in more detail in FT_DATATYPE_SPIKE
%
% See also FT_DATATYPE_SPIKE, FT_READ_HEADER, FT_READ_DATA, FT_READ_EVENT

% Copyright (C) 2007-2011 Robert Oostenveld
%
% This file is part of FieldTrip, see http://www.ru.nl/neuroimaging/fieldtrip
% for the documentation and details.
%
%    FieldTrip is free software: you can redistribute it and/or modify
%    it under the terms of the GNU General Public License as published by
%    the Free Software Foundation, either version 3 of the License, or
%    (at your option) any later version.
%
%    FieldTrip is distributed in the hope that it will be useful,
%    but WITHOUT ANY WARRANTY; without even the implied warranty of
%    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
%    GNU General Public License for more details.
%
%    You should have received a copy of the GNU General Public License
%    along with FieldTrip. If not, see <http://www.gnu.org/licenses/>.
%
% $Id: ft_read_spike.m 7393 2013-01-23 14:33:27Z jorhor $

% optionally get the data from the URL and make a temporary local copy
filename = fetch_url(filename);

if ~exist(filename,'file')
    error('File or directory does not exist')
end