pop_newset.m

% POP_NEWSET - Edit/save EEG dataset structure information.
%
% Usage:
%   >> [ALLEEG EEG CURRENTSET] = pop_newset( ALLEEG, EEG, CURRENTSET,...
%                                            'key', val,...);
% Inputs and outputs:
%   ALLEEG     - array of EEG dataset structures
%   EEG        - current dataset structure or structure array
%   CURRENTSET - index(s) of the current EEG dataset(s) in ALLEEG
%
% Optional inputs:
%   'setname'     - ['string'] name for the new dataset
%   'comments'    - ['string'] comments on the new dataset
%   'overwrite'   - ['on'|'off'] overwrite the old dataset
%   'saveold'     - ['filename'] filename in which to save the old dataset
%   'savenew'     - ['filename'] filename in which to save the new dataset
%   'retrieve'    - [index] retrieve the old dataset (ignore recent changes)
%   'guistring'   - ['string'] text for the GUI
%
% Note: Calls EEG_STORE which may modify the variable ALLEEG 
%       containing the current dataset(s).
%
% Author: Arnaud Delorme, CNL / Salk Institute, 23 Arpil 2002
%
% See also: EEG_STORE, POP_EDITSET, EEGLAB

% Copyright (C) 23 Arpil 2002 Arnaud Delorme, Salk Institute, arno@salk.edu
%
% This file is part of EEGLAB, see http://www.eeglab.org
% for the documentation and details.
%
% Redistribution and use in source and binary forms, with or without
% modification, are permitted provided that the following conditions are met:
%
% 1. Redistributions of source code must retain the above copyright notice,
% this list of conditions and the following disclaimer.
%
% 2. Redistributions in binary form must reproduce the above copyright notice,
% this list of conditions and the following disclaimer in the documentation
% and/or other materials provided with the distribution.
%
% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
% AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
% IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
% ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
% LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
% CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
% SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
% INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
% CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
% ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
% THE POSSIBILITY OF SUCH DAMAGE.

%   'aboutparent' - ['on'|'off'] insert reference to parent dataset in the comments

% testing: both options must be tested with datasets that have 2
%          files (.set and .dat) and with dataset using a single file
%
% Option when only one dataset is kept in memory
% 
% *********** When STUDY present ***********
% Study selected -> select single dataset
% Study selected -> select multiple datasets
% Several dataset selected -> select single dataset
% Several dataset selected -> select other several datasets
% Several dataset selected -> select study
% Dataset (not modified) selected -> select study 
% Dataset (not modified) selected -> select multiple datasets 
% Dataset (not modified) selected -> select other single dataset 
% Dataset (not modified) selected -> create new dataset (eg. resample) 
% Dataset (modified) selected -> select study 
% Dataset (modified) selected -> select multiple datasets 
% Dataset (modified) selected -> select other single dataset 
% Dataset (modified) selected -> create new dataset (eg. resample) 
% *********** When study absent ************
% Several dataset selected -> select single dataset
% Several dataset selected -> select other several datasets
% Dataset (not modified) selected -> select multiple datasets 
% Dataset (not modified) selected -> select other single dataset 
% Dataset (not modified) selected -> create new dataset (eg. resample) 
% Dataset (modified) selected -> select multiple datasets 
% Dataset (modified) selected -> select other single dataset 
% Dataset (modified) selected -> create new dataset (eg. resample) 
%
% Option when several datasets can be kept in memory
% 
% *********** When STUDY present ***********
% Study selected -> select single dataset
% Study selected -> select multiple datasets
% Several dataset selected -> select single dataset
% Several dataset selected -> select other several datasets
% Several dataset selected -> select study
% Dataset (not modified) selected -> select study 
% Dataset (not modified) selected -> select multiple datasets 
% Dataset (not modified) selected -> select other single dataset 
% Dataset (not modified) selected -> create new dataset (eg. resample) 
% Dataset (modified) selected -> select study 
% Dataset (modified) selected -> select multiple datasets 
% Dataset (modified) selected -> select other single dataset 
% Dataset (modified) selected -> create new dataset (eg. resample) 
% *********** When study absent ************
% Several dataset selected -> select single dataset
% Several dataset selected -> select other several datasets
% Dataset (not modified) selected -> select multiple datasets 
% Dataset (not modified) selected -> select other single dataset 
% Dataset (not modified) selected -> create new dataset (eg. resample) 
% Dataset (modified) selected -> select multiple datasets 
% Dataset (modified) selected -> select other single dataset 
% Dataset (modified) selected -> create new dataset (eg. resample) 

function [ALLEEG, EEG, CURRENTSET, com] = pop_newset( ALLEEG, EEG, OLDSET, varargin);
% pop_newset( ALLEEG, EEG, 1, 'retrieve', [], 'study', [1] (Retrieving a study)

verbose = 0;
if nargin < 3
   help pop_newset;
   return;
end
CURRENTSET = OLDSET;
com = sprintf('[ALLEEG EEG CURRENTSET] = pop_newset(ALLEEG, EEG, %s); ', vararg2str( { OLDSET varargin{:} } ));

[g, varargin] = finputcheck(varargin, { ...
    'gui',           'string',   { 'on'; 'off' },  'on';
    'guistring',     'string',   { },              'What do you want to do with the new dataset?';
    'retrieve'       'integer'  []                 [];
    'study'          'integer'  [0 1]              0;
                    }, 'pop_newset', 'ignore');
if ischar(g), error(g); end
eeglab_options;
if length(EEG) > 1
    % ***************************************************
    % case 1 -> multiple datasets in memory (none has to be saved), retrieving single dataset
    % ***************************************************
    if ~isempty(g.retrieve)
        [EEG, ALLEEG, CURRENTSET] = eeg_retrieve( ALLEEG, g.retrieve);
    elseif length(OLDSET) == length(EEG)
    % ***************************************************
    % case 2 -> multiple datasets processed, storing them
    % ***************************************************
        [ALLEEG EEG CURRENTSET] = eeg_store(ALLEEG, EEG, OLDSET);
    else
    % ***************************************************
    % case 3 -> multiple datasets processed, storing new copies (not used in EEGLAB)
    % ***************************************************
        if strcmpi(EEG(1).saved, 'justloaded')
            for ieeg = 1:length(EEG)
                [ALLEEG TMP OLDSET] = pop_newset(ALLEEG, EEG(ieeg), OLDSET);
            end
            CURRENTSET = OLDSET;
            EEG = TMP;
        else
            [ALLEEG EEG CURRENTSET] = eeg_store(ALLEEG, EEG);
        end
    end
    return;
elseif ~isempty(g.retrieve) % command line call
    % ***************************************************
    % case 4 -> single dataset, does not have to be saved, 
    %           retrieving another dataset
    % ***************************************************
    if verbose, disp('Case 4'); end
    samedat = isequal(EEG, ALLEEG(OLDSET));
    if ~(option_storedisk && strcmpi(EEG.saved, 'no')) || samedat
        if strcmpi(EEG.saved, 'yes') && option_storedisk && ~samedat
            fprintf('pop_newset(): Dataset %d has not been modified since last save, so did not resave it.\n', OLDSET);
            EEG = update_datafield(EEG);
        
            tmpsave = EEG.saved;
            EEG = eeg_hist(EEG, com);        
            [ALLEEG, EEG] = eeg_store(ALLEEG, EEG, OLDSET);
            EEG.saved            = tmpsave; % eeg_store automatically set it to 'no'
            ALLEEG(OLDSET).saved = tmpsave;
        end
        
        if ~isempty(g.retrieve)
            [EEG, ALLEEG, CURRENTSET] = eeg_retrieve( ALLEEG, g.retrieve);
        end
        return;
    end
end

if isempty(EEG)
    args = { 'retrieve', OLDSET }; % cancel    
elseif length(varargin) == 0 && length(EEG) == 1 && strcmpi(g.gui, 'on') % if several arguments, assign values 
    % popup window parameters	
    % -----------------------
    text_new   = g.guistring;
    comcomment = ['tmpuserdat = get(gcbf, ''userdata'');' ...
				  'tmpuserdat = pop_comments(tmpuserdat, ''Edit dataset comments'');' ...
				  'set(gcbf, ''userdata'', tmpuserdat); clear tmpuserdat;'];
	comsavenew   = ['[tmpfile tmppath] = uiputfile(''*.set'', ''Enter filename''); drawnow;' ...
				  'if tmpfile ~= 0,' ...
				  '    set(findobj(''parent'', gcbf, ''tag'', ''filenamenew''), ''string'', fullfile(tmppath, tmpfile));' ...
				  'end;' ...
				  'clear tmpuserdat tmpfile tmppath;'];
    cb_savenew   = [ 'set(findobj(gcbf, ''userdata'', ''filenamenew''), ''enable'', fastif(get(gcbo, ''value''), ''on'', ''off''));' ];
    cb_saveold   = [ 'set(findobj(gcbf, ''userdata'', ''filenameold''), ''enable'', fastif(get(gcbo, ''value''), ''on'', ''off''));' ];
	comsaveold   = ['[tmpfile tmppath] = uiputfile(''*.set'', ''Enter filename''); drawnow;' ...
				  'if tmpfile ~= 0,' ...
				  '    set(findobj(''parent'', gcbf, ''tag'', ''filenameold''), ''string'', fullfile(tmppath, tmpfile));' ...
				  'end;' ...
				  'clear tmpuserdat tmpfile tmppath;'];
    enable_saveold = 'off';
    enable_savenew = 'off';
    value_saveold  = 0;
    value_savenew  = 0;
    value_owrt   = 0;
    cb_owrt      = '';
	userdat = EEG.comments;
    
    % status of parent dataset etc...
    saved = 1;
    filenameold = '';
    filenamenew = '';
    if ~isempty(ALLEEG) && any(OLDSET ~= 0) && length(OLDSET) == 1
        if strcmpi(ALLEEG(OLDSET).saved, 'no')
            saved = 0;
            if ~isempty(ALLEEG(OLDSET).filename)
                filenameold = fullfile(ALLEEG(OLDSET).filepath, ALLEEG(OLDSET).filename);
            end
        end
    end
    overwrite_or_save = 0;
    have_to_save_new  = 0;

    % ***************************************************
    % case 5 -> single dataset, has to be saved, one dataset to retrieve and study present or several dataset to retrieve
    % ***************************************************
    if length(g.retrieve) > 1 || ( g.study && ~isempty(g.retrieve)) % selecting several datasets or a study is present
        if verbose, disp('Case 5'); end
        text_new = 'Current dataset has not been saved. Saved it or reload it from disk.';
        text_old = '';
        have_to_save_new = 1;
        value_savenew    = 1;
        enable_savenew = 'on';
        filenamenew    = fullfile(EEG.filepath, EEG.filename);
        cb_savenew     = [ 'if ~get(gcbo, ''value'') & ~get(findobj(gcbf, ''tag'', ''cb_loadold''), ''value''),' ...
                       '   set(gcbo, ''value'', 1);' ...
                       '   warndlg2(strvcat(''You must enter a filename for the dataset or use the copy on disk!'','' '',' ...
                       '   ''It must be saved or you must use the old dataset on disk because, by your current memory'',' ...
                       '   ''option, only one full dataset or study can be kept in memory. Note that if you choose to'',' ...
                       '   ''save the dataset, this will be taken into account in the study.''));' ...
                       'else, ' cb_savenew ...
                       'end;' ];
    % ***************************************************
    % case 6 -> single dataset modified or not, study is present (the old
    %           dataset has to be replaced to preserve study consistency)
    % ***************************************************
    elseif g.study == 1 && isempty(g.retrieve)
        if verbose, disp('Case 6'); end
        if saved
            text_old       = 'The old dataset has not been modified since last saved. What do you want to do with it?';
            cb_saveold     = '';
        else
            text_old = 'Some changes have not been saved. What do you want to do with the old dataset?';
        end
        cb_owrt      = [ ...
                       '   set(gcbo, ''value'', 1);' ...
                       '    warndlg2(strvcat(''Cannot unset the overwrite checkbox!'','' '',' ...
                           '''The old dataset must be overwritten since all datasets'',' ...
                           '''must be in the STUDY.''), ''warning'');' ];
        value_owrt   = 1;
        filenamenew    = fullfile(EEG.filepath, EEG.filename);
    % ***************************************************
    % case 7 -> single dataset modified, study is absent, old copy has to
    %           be flush to disk or overwritten 
    % ***************************************************
    elseif ~saved && option_storedisk
        if verbose, disp('Case 7'); end
        text_old = 'Some changes have not been saved. What do you want to do with the old dataset?';
        cb_saveold     = [ 'if ~get(findobj(gcbf, ''tag'', ''cb_owrt''), ''value''),' ...
                       '   set(gcbo, ''value'', 1);' ...
                       '    warndlg2(strvcat(''Cannot unset the save checkbox!'','' '',' ...
                           '''By your selected memory option, only one full dataset'',' ...
                           '''can be kept in memory. Thus, you must either'',' ...
                           '''save or delete/overwrite the old dataset.''));' ... 
                       'else, ' cb_saveold ...
                       'end;' ];
        cb_owrt      = [ 'if ~get(findobj(gcbf, ''tag'', ''cb_saveold''), ''value''),' ...
                       '   set(gcbo, ''value'', 1);' ...
                       '    warndlg2(strvcat(''Cannot unset the overwrite checkbox!'','' '',' ...
                           '''By your memory option, only one full dataset'',' ...
                           '''can be kept in memory. Thus, you must either'',' ...
                           '''save or delete/overwrite the old dataset.''));' ... 
                       'end;' ];
        enable_saveold = 'on';
        value_owrt   = 1;
        overwrite_or_save = 1;
    elseif ~saved
    % ***************************************************
    % case 8 -> single dataset modified, study is absent, no constraint on saving
    % ***************************************************
        if verbose, disp('Case 8'); end
        text_old = 'Some changes have not been saved. What do you want to do with the old dataset?';
    else
    % ***************************************************
    % case 9 -> single dataset not modified, study is absent, no constraint on saving
    % ***************************************************
        if verbose, disp('Case 9'); end
        text_old       = 'What do you want to do with the old dataset (not modified since last saved)?';
        cb_saveold     = '';
        cb_overwrite   = 'Overwrite current dataset|New dataset';
    end
        
    geometry    = { [1] [0.15 0.5 1 0.5] [0.15 0.5 1 0.5] [1] [1] [0.15 1.8 0.1 0.1] [0.15 0.5 1 0.5] };
    geomvert    = [ ];
    uilist = { ...
         { 'style', 'text',       'string', text_new, 'fontweight', 'bold' } ...
         {} ...
         { 'Style', 'text',       'string', 'Name it:' } ...
		 { 'Style', 'edit',       'string', EEG.setname 'tag' 'namenew' } ...
		 { 'Style', 'pushbutton', 'string', 'Edit description', 'callback', comcomment } ...
         { 'Style', 'checkbox'  , 'string', '', 'callback', cb_savenew 'value' value_savenew 'tag' 'cb_savenew' } ...
         { 'Style', 'text',       'string', 'Save it as file:' } ...
         { 'Style', 'edit',       'string', filenamenew, 'tag', 'filenamenew' 'userdata' 'filenamenew'  'enable' enable_savenew } ...
         { 'Style', 'pushbutton', 'string', 'Browse', 'callback', comsavenew 'userdata' 'filenamenew' 'enable' enable_savenew } ...
         { } ...
         { 'style', 'text',       'string', text_old 'fontweight' 'bold' } ...
         { 'Style', 'checkbox'  , 'string', '' 'tag' 'cb_owrt' 'callback' cb_owrt 'value' value_owrt } ...
         { 'Style', 'text'      , 'string', 'Overwrite it in memory (set=yes; unset=create a new dataset)' } {} ...
         { } ...
         { 'Style', 'checkbox'  , 'string', '', 'callback', cb_saveold 'value' value_saveold 'tag' 'cb_saveold' } ...
         { 'Style', 'text'      , 'string', 'Save it as file:' } ...
         { 'Style', 'edit'      , 'string', filenameold, 'tag', 'filenameold'   'userdata' 'filenameold' 'enable' enable_saveold } ...
         { 'Style', 'pushbutton', 'string', 'Browse', 'callback', comsaveold 'userdata' 'filenameold' 'enable' enable_saveold } };
    
    % remove old dataset if not present
    % ---------------------------------
    if OLDSET == 0
        uilist = uilist(1:9);
        geometry = geometry(1:3);
    end
    if isempty(cb_saveold)
        uilist(end-3:end) = [];
        geometry(end)     = [];
    end
    
    % update GUI for selecting multiple datasets
    % ------------------------------------------
    if length(g.retrieve) > 1 || ( g.study && ~isempty(g.retrieve)) % selecting several datasets or a study is present
        uilist = uilist(1:9);
        geometry = geometry(1:3);
        if ~isempty(EEG.filename)
            cb_loadold = [ 'if ~get(gcbo, ''value'') & ~get(findobj(gcbf, ''tag'', ''cb_savenew''), ''value''),' ...
                           '   set(gcbo, ''value'', 1);' ...
                           '   warndlg2(strvcat(''You must enter a filename for the dataset or use the copy on disk!'','' '',' ...
                           '   ''It must be saved or you must use the old dataset on disk because, by your current memory option, only one full'',' ...
                           '   ''dataset or study can be kept in memory. This will also affect the'',' ...
                           '   ''dataset at this position in the study.''));' ...
                           'end;' ];
            uilist{end+1} = { 'Style', 'checkbox'  , 'string', '', 'callback', cb_loadold 'tag' 'cb_loadold' };
            uilist{end+1} = { 'Style', 'text',       'string', 'Reload copy from disk (will be done after optional saving above)' };
            uilist{end+1} = {};
            uilist{end+1} = {};
             geometry = { geometry{:} [0.2 1.6 0.12 0.2] };
        end
    end
            
    % remove new dataset if already saved
    % -----------------------------------
    if ~isfield(EEG, 'saved')
        EEG = eeg_checkset(EEG);
    end
    if strcmpi(EEG.saved, 'justloaded') || ~isempty(g.retrieve)
        if overwrite_or_save % only pop-up a window if some action has to be taken
            uilist = uilist(11:end);
            geometry = geometry(5:end);
            uilist(3) = {{ 'Style', 'text'      , 'string', 'Delete it from memory (set=yes)' }};
        elseif isempty(g.retrieve) % just loaded from disk
            
            % remove data from file for old dataset
            % -------------------------------------
            if option_storedisk && ~isempty(ALLEEG) && OLDSET ~= 0
                if ~isfield(ALLEEG(OLDSET), 'datfile'), ALLEEG(OLDSET).datfile = ''; end
                ALLEEG(OLDSET) = update_datafield(ALLEEG(OLDSET));
            end
            
            [ALLEEG, EEG, CURRENTSET] = eeg_store( ALLEEG, EEG, 0); % 0 means that it is saved on disk
            com = '[ALLEEG, EEG, CURRENTSET] = eeg_store( ALLEEG, EEG, 0 );';
            return;
        end
    end
    
    % show GUI (do not return if old dataset has to be saved or overwritten)
    % ----------------------------------------------------------------------
    cont = 1;
    while cont
        [result userdat tmp tags] = inputgui( 'geometry', geometry, 'uilist', uilist, 'helpcom', 'pophelp(''pop_newset'');', ...
                                     'title', 'Dataset info -- pop_newset()', ...
                                     'userdata', userdat, 'geomvert', geomvert);
        try, tags.cb_owrt;      catch, tags.cb_owrt = 0;    end
        try, tags.cb_savenew;   catch, tags.cb_savenew = 0; end
        try, tags.cb_saveold;   catch, tags.cb_saveold = 0; end
        try, tags.cb_loadold;   catch, tags.cb_loadold = 0; end
        try, tags.namenew;      catch, tags.namenew = EEG.setname; end
        try, tags.filenamenew;  catch, tags.filenamenew = ''; end
        cont = 0;
        if ~isempty(result)
            if overwrite_or_save && tags.cb_saveold % save but not overwrite
                if isempty(tags.filenameold)
                    warndlg2(strvcat('Error: You must enter a filename for the old dataset!',' ', ...
                           'The old dataset must be saved because, by your', ...
                           'current memory option, only one full dataset', ...
                           'can be kept in memory. Thus, you must either', ...
                           'save or overwrite the old dataset.'));
                    cont = 1;
                end
            end
        end
        if have_to_save_new
            if isempty(result) % cancel
                com = '';
                drawnow;
                return;
            else
                if isempty(tags.filenamenew) && tags.cb_savenew
                    warndlg2(strvcat('Error: You must enter a filename for the dataset!',' ', ...
                           'It must be saved because, by your current memory option, only one full', ...
                           'dataset or study can be kept in memory. Note that all changes will be', ...
                           'taken into account when processing the STUDY.'));
                    cont = 1;
                end
            end
        end
    end
    drawnow;

    % decode parameters
    % -----------------
    args = {};
    if length(result) == 0,
        if isempty(g.retrieve)
            if isempty(OLDSET), error('Cancel operation'); end
            args = { 'retrieve', OLDSET }; % cancel
        else
            com = '';
            return;
        end
	else 
        % new dataset
        % -----------
        if ~strcmp(EEG.setname, tags.namenew )       
            args = { 'setname', tags.namenew };
        end
        if tags.cb_savenew 
            if ~isempty(tags.filenamenew) 
                args = { args{:} 'savenew', tags.filenamenew };
            else
                disp('Warning: no filename given for new dataset, so it will not be saved to disk.');
            end
        end
        if ~strcmp(EEG.comments, userdat)
            args = { args{:} 'comments', userdat };
        end
        if tags.cb_loadold    
            args = { args{:} 'reload' 'on' };
        end
        
        % old dataset
        % -----------
        if tags.cb_owrt
            args = { args{:} 'overwrite' 'on' };
        end
        if tags.cb_saveold 
            if ~isempty(tags.filenameold) 
                args = { args{:} 'saveold', tags.filenameold };
            else
                disp('Warning: no file name given for the old dataset, so it will not be saved to disk.');
            end
        end
    end
elseif length(EEG) > 1
    % processing multiple datasets
    % ----------------------------
    [ALLEEG, EEG, CURRENTSET] = eeg_store( ALLEEG, EEG, OLDSET ); % it is possible to undo the operation here
    com = '[ALLEEG, EEG, CURRENTSET] = eeg_store( ALLEEG, EEG, CURRENTSET );';
    return;
else
    % no interactive inputs
    args = varargin;
end

% assigning values
% ----------------
overWflag    = 0;
if isempty(g.retrieve) && ~isempty(EEG)
    if strcmpi(EEG.saved, 'justloaded')
        EEG.saved = 'yes';
    else
        EEG.saved = 'no';
    end
end

for ind = 1:2:length(args)
    switch lower(args{ind})
	 case 'setname'   , EEG.setname = args{ind+1}; EEG = eeg_hist(EEG, [ 'EEG.setname=''' EEG.setname ''';' ]); 
	 case 'comments'  , EEG.comments = args{ind+1};
	 case 'reload'    , EEG = pop_loadset('filename', EEG.filename, 'filepath', EEG.filepath, 'loadmode', 'info');
                        [ALLEEG EEG] = eeg_store(ALLEEG, EEG, OLDSET);
                        ALLEEG(OLDSET).saved = 'yes';
	 case 'retrieve'  , if ~isempty(ALLEEG) & args{ind+1} ~= 0
                            EEG = eeg_retrieve(ALLEEG, args{ind+1}); 
                        else
                            EEG = eeg_emptyset;
                        end
                        com = ''; return;
	 case { 'save' 'savenew' }, [filepath filename ext] = fileparts( args{ind+1} );
                        EEG = pop_saveset(EEG, [ filename ext ], filepath);
	 case 'saveold',    [filepath filename ext] = fileparts( args{ind+1} );
                        TMPEEG = pop_saveset(ALLEEG(OLDSET), [ filename ext ], filepath);
                        [ALLEEG] = eeg_store(ALLEEG, TMPEEG, OLDSET);
                        ALLEEG(OLDSET).saved = 'yes';
	 case 'overwrite' , if strcmpi(args{ind+1}, 'on') | strcmpi(args{ind+1}, 'yes')
                            overWflag = 1; % so it can be done at the end
                        end
	 otherwise, error(['pop_newset error: unrecognized key ''' args{ind} '''']); 
    end
end

% remove data from file if necessary
% ----------------------------------
if option_storedisk && ~isempty(ALLEEG) && OLDSET(1) ~= 0 && length(OLDSET) == 1
    if ~isfield(ALLEEG, 'datfile'), ALLEEG(OLDSET).datfile = ''; end
    ALLEEG(OLDSET) = update_datafield(ALLEEG(OLDSET));
end

% moving/erasing/creating datasets
% --------------------------------
if ~isempty(g.retrieve)
    
    % in case the old dataset was modified
    % ------------------------------------
    if strcmpi(EEG.saved, 'yes')
        [ALLEEG, EEG] = eeg_store( ALLEEG, EEG, OLDSET);
        ALLEEG(OLDSET).saved = 'yes';
        EEG.saved            = 'yes';
    else
        [ALLEEG, EEG] = eeg_store( ALLEEG, EEG, OLDSET);
    end

    % dataset retrieval
    % -----------------
    if overWflag % delete old dataset
        ALLEEG = pop_delset( ALLEEG, OLDSET);
    end
    [EEG, ALLEEG, CURRENTSET] = eeg_retrieve( ALLEEG, g.retrieve);
else
    % new dataset
    % -----------
    if overWflag
        if strcmpi(EEG.saved, 'yes')
            [ALLEEG, EEG] = eeg_store( ALLEEG, EEG, OLDSET);
            ALLEEG(OLDSET).saved = 'yes';
            EEG.saved            = 'yes';
        else
            [ALLEEG, EEG] = eeg_store( ALLEEG, EEG, OLDSET);
        end
    else
        if strcmpi(EEG.saved, 'yes') || strcmpi(EEG.saved, 'justloaded')
            [ALLEEG, EEG, CURRENTSET] = eeg_store( ALLEEG, EEG, 0); % 0 means that it is saved on disk
        else
            [ALLEEG, EEG, CURRENTSET] = eeg_store( ALLEEG, EEG);
        end
    end
end

com = sprintf('[ALLEEG EEG CURRENTSET] = pop_newset(ALLEEG, EEG, %s); ', vararg2str( { OLDSET args{:} 'gui' 'off' } ));
return;

function num = popask( text )
	 ButtonName=questdlg2( text, ...
	        'Confirmation', 'Cancel', 'Yes','Yes');
	 switch lower(ButtonName)
	      case 'cancel', num = 0;
	      case 'yes',    num = 1;
	 end

function EEG = update_datafield(EEG)
    if ~isfield(EEG, 'datfile'), EEG.datfile = ''; end
    if ~isempty(EEG.datfile)
        EEG.data = EEG.datfile;
    else 
        EEG.data = 'in set file';
    end
    EEG.icaact = [];