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: mars_armoire.m
    path of file: ./repos/malini/Codes/deconvolution - model/spm8/marsbar-0.44
    
    the code of the file until where you have to start completion: function varargout = mars_armoire(action, item, data, filename)
% multifunction function to get/set various stores of stuff
% (armoire is the French for cupbo
    
function

function I = i_def
% returns default item
I = struct('data', [],...
	   'file_name', '',...
	   'default_file_name','',...
	   'has_changed', 0,...
	   'leave_as_file', 0,...
	   'save_if_changed', 1,...
	   'file_type', 'mat',...
	   'char_is_filename',1,...
	   'set_action_if_update', 0 ,...
	   'set_action_if_clear', 0 ,...
	   'verbose', 1,...
	   'title', 'file',...
	   'filter_spec', '',...
	   'set_action', '');
return

function res = i_isempty(I)
res = isempty(I.data) & isempty(I.file_name);
return

function res = i_set_ui(I)
[fn pn] = mars_uifile('get', I.filter_spec, ['Select ' I.title '...']);
if isequal(fn,0) | isequal(pn,0), res = []; return, end