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: gencode_item.m
    path of file: ./repos/bspm/thirdparty/spm8/matlabbatch/@cfg_item
    
    the code of the file until where you have to start completion: function [str, tag, cind, ccnt] = gencode_item(item, tag, tagctx, stoptag, tropts)

% function [str, tag, cind, ccnt] = gencode_item(item, t
    
function on their cfg_item field)
cind = 4;
%% Tag and Name
% Set basic fields
str{end+1} = sprintf('%s.tag     = ''%s'';', tag, item.tag);
% Add three spaces to name tag - this will align equal signs
% Works only because gencode does not produce subscripts for strings
str1 = gencode(item.name, sprintf('%s.name   ', tag), tagctx);
str = [str(:)' str1(:)'];
%% Val
% Generate val field
if numel(item.val) > 0 && isa(item.val{1}, 'cfg_item')
    % Traverse val{:} tree, if items are cfg_items
    cstr = {};
    % Update clvl
    ctropts = tropts;
    ctropts.clvl = ctropts.clvl + 1;
    ctropts.cnt  = ctropts.cnt + ccnt;
    ctag = cell(size(item.val));
    for k = 1:numel(item.val)
        % tags are used as variable names and need to be unique in the
        % context of this .val tag. This includes the item's tag itself
        % and the tags of its children.
        ctag{k} = genvarname(subsref(item.val{k}, substruct('.','tag')), ...
                             tagctx);
        [ccstr ctag{k} ccind cccnt] = gencode_item(item.val{k}, ctag{k}, tagctx, ...
                                              stoptag, ctropts);
        if ~isempty(ccstr)
            % Child has returned code
            cstr = [cstr(:)' ccstr(:)'];
            ccnt = ccnt + cccnt;
            ctropts.cnt = ctropts.cnt + cccnt;
            tagctx = [tagctx ctag(k)];
        end