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_trialfun_edf.m
    path of file: ./repos/bspm/thirdparty/spm12/external/fieldtrip/trialfun
    
    the code of the file until where you have to start completion: function [trl, event] = ft_trialfun_edf(cfg)

% FT_TRIALFUN_EDF is an example trial function. It searches for events
% of type "up" in an analog data channel, as indentified by thresholding. 
% This threshold can be a hard threshold, i.e. a numeric, or flexibly defined 
% by an executable string (e.g., calculating the 'median' of an analog signal.
% 
% You can use this example trial function as template for your own
% conditial trial definitions.

    
function [trl, event] = ft_trialfun_edf(cfg)

% FT_TRIALFUN_EDF is an example trial function. It searches for events
% of type "up" in an analog data channel, as indentified by thresholding. 
% This threshold can be a hard threshold, i.e. a numeric, or flexibly defined 
% by an executable string (e.g., calculating the 'median' of an analog signal.
% 
% You can use this example trial function as template for your own
% conditial trial definitions.
%
% See also FT_DEFINETRIAL, FT_PREPROCESSING

if strcmp(mfilename,'ft_trialfun_edf')
  ft_warning('this trial function is only an example, please copy it and adapt it to your specific EDF situation - see http://www.fieldtriptoolbox.org/getting_started/edf');
end