ds003216/code/add_context.m

% Adds a context.tsv file for each vaso file
% specifying the volume type of each volume
%
% requires bids-matlab: https://github.com/bids-standard/bids-matlab
%
%

clear;

root_dir = fullfile(fileparts(mfilename('fullpath')), '..');

% this is hard coded here
% but obviously would have to be adapted dynamically to each file
volume_order = {'non_nulled'; 'nulled'};
AcquisitionDuration
nb_volumes = 200;

%%
BIDS = bids.layout(root_dir, 'use_schema', false);
files = bids.query(BIDS, 'data', 'suffix', 'vaso');

for i = 1:numel(files)

    context = struct('volume_type', {{}});

    context_filename = bids.File(files{i});
    context_filename.extension = '.tsv';
    context_filename.suffix = 'context';

    context.volume_type = repmat(volume_order, nb_volumes / numel(volume_order), 1);

    output_file = fullfile(BIDS.pth, ...
                           context_filename.bids_path, ...
                           'func', ...
                           context_filename.filename);

    bids.util.tsvwrite(output_file, context);

end