extract_filestruct.m

function [level1,level2,level3,level4,level5] = extract_filestruct(fld)

% [level1,level2,level3,level4,level5] = EXTRACT_FILESTRUCT(fld) returns file structure
%
% ARGUMENTS
%  fld     ...   root folder to operate on
%
% RETURNS
%  level1  ...  1st level of sorting in file tree
%  level2  ...  2nd level of sorting in file tree
%  level3  ...  3rd level of sorting in file tree
%  level4  ...  4th level of sorting in file tree
%  level5  ...  5th level of sorting in file tree
%
% NOTES
% - Future updates should allow n levels to be sorted

% Updated by Philippe C. Dixon Sept 2017
% - Added a 5th possible level

% EXTRACT ALL FILES
%
fl = engine('path',fld,'extension','zoo');


% FIND 1st Level (e.g. between subject condition)
%
s = filesep;
subdirs = subdir(fld);
indxfld = strfind(fld,s);

level1 = cell(length(fl),1);

for i = 1:length(subdirs)
    
    temp = subdirs{i};
    indxgrp = strfind(subdirs{i},s);
        
    if length(indxgrp) == length(indxfld) +1                 % groups are 1 step down
        level1{i} = temp(indxgrp(end)+1:end);
    end
      
end

level1(cellfun(@isempty,level1)) = [];                       % That's some hot programming
       
    

% FIND 2nd level (e.g. subject)
%
level2 = cell(length(fl),1);

for i = 1:length(subdirs)
    
    temp = subdirs{i};
    indxsub = strfind(subdirs{i},s);
        
    if length(indxsub) == length(indxfld) +2                  % subjects are 2 steps down  
        level2{i} = temp(indxsub(end)+1:end);
    end
      
end

level2(cellfun(@isempty,level2)) = [];                    % That's some hot programming

    

% Find 3rd level (e.g. within subject conditon)
%
level3 = cell(length(fl),1);

for i = 1:length(subdirs)
    
    temp = subdirs{i};
    indxcon = strfind(subdirs{i},s);
        
    if length(indxcon) == length(indxfld) + 3                  % condiitons (if any) are 3  steps down  
        level3{i} = temp(indxcon(end)+1:end);
    end
      
end

level3(cellfun(@isempty,level3)) = [];                             % That's some hot programming
level3 = unique(level3);


% Find 4th level (e.g. within subject conditon)
%
level4 = cell(length(fl),1);

for i = 1:length(subdirs)
    
    temp = subdirs{i};
    indxcon = strfind(subdirs{i},s);
        
    if length(indxcon) == length(indxfld) + 4                  % condiitons (if any) are 3  steps down  
        level4{i} = temp(indxcon(end)+1:end);
    end
      
end

level4(cellfun(@isempty,level4)) = [];                             % That's some hot programming
level4 = unique(level4);




% Find 5th level (something else)
%
level5 = cell(length(fl),1);

for i = 1:length(subdirs)
    
    temp = subdirs{i};
    indxcon = strfind(subdirs{i},s);
        
    if length(indxcon) == length(indxfld) + 5                  % condiitons (if any) are 3  steps down  
        level5{i} = temp(indxcon(end)+1:end);
    end
      
end

level5(cellfun(@isempty,level5)) = [];                             % That's some hot programming
level5 = unique(level5);