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## Copyright (C) 2003-2018 Tomer Altman <taltman@lbl.gov>
##
## This program is free software; you can redistribute it and/or modify it under
## the terms of the GNU General Public License as published by the Free Software
## Foundation; either version 3 of the License, or (at your option) any later
## version.
##
## This program is distributed in the hope that it will be useful, but WITHOUT
## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
## details.
##
## You should have received a copy of the GNU General Public License along with
## this program; if not, see <http://www.gnu.org/licenses/>.
## append_save M-file function
##
## Objective: be able to add variables to existing save files. Works for
## all the types of save files that "save" supports.
##
## Input:
## 1) A string which specifies the existing save file.
## 2) The options you need to pass to the 'save' function to save to the
## file type that you want.
## 3) A 1x2 cell, with the first element being a string representation
## of the variable/symbol that you're trying to add, followed by the
## actual variable/symbol itself.
## 4) Any number of additional 1x2 cells, following the same format as
## the 3rd argument specified immediately before this one.
##
## Output:
## Currently, none. But there might be some debugging / error-code
## messages in the future.
##
## Example:
## octave> B = ones(2,2);
## octave> append_save( "test.txt", "-binary", {"B", B } )
function [ return_value ] = append_save ( filename,
option,
var_val_cell,
varargin )
## Input checking:
if ( nargin < 3 )
error("append_save: needs three arguments.");
elseif ( !ischar(filename) )
error("append_save: filename must be a string.");
elseif ( !ischar(option) )
error("append_save: option must be a string." );
elseif ( !iscell(var_val_cell) )
error("append_save: variable-value pairs must be cells.")
elseif ( nargin > 3 )
for i=1:(nargin-3)
current_cell = varargin(i);
if ( !iscell(current_cell) )
error("append_save: variable-value pairs must be cells.");
elseif ( ( columns( current_cell ) != 2 )
|| ( rows( current_cell ) != 1 ) )
error("append_save: variable-value pairs must be 1x2 cells.")
elseif ( !ischar(current_cell{1} ) )
error("append_save: variable in pair must be a string." )
endif
endfor
endif
## First step: load into the environment what is already stuffed in
## the target file. Then, add their name to the list for "save".
env1 = who;
eval([ "load -force ", ...
option, " ", ...
filename ] );
env2 = who;
num_orig_vars = rows(env1);
# Not really 'current' env...
num_current_vars = rows(env2);
num_new_vars = num_current_vars - num_orig_vars;
var_str = "";
## This double 'for loop' weeds out only the loaded vars for
## inclusion.
if ( num_new_vars )
for i=1:num_current_vars
current_var = env2{i,1};
old_bool = 0;
for j=1:num_orig_vars
if ( strcmp( env1{j,1}, env2{i,1} )
||
strcmp( env2{i,1}, "env1" ) )
old_bool = 1;
endif
endfor
if ( old_bool == 0 )
var_name = env2{i,1};
var_str = [ var_str, " ", var_name, " " ];
endif
endfor
endif
## Second step: load into the environment the variable pairs. Then,
## add the name to the string for "save".
var_name = var_val_cell{1};
var_val = var_val_cell{2};
temp = var_val;
eval([ var_name, "=temp;" ]);
var_str = [ var_str, " ", var_name, " " ];
## Third step: do the same as step two, but loop through the possible
## variable arguments.
for i=1:(nargin-3)
current_cell = varargin(i);
var_name = current_cell{1};
var_val = current_cell{2};
temp = var_val;
eval([ var_name, "=temp;" ]);
var_str = [ var_str, " ", var_name, " " ];
var_str
endfor
## Finally, save all of the variables into the target file:
eval( [ "save ", ...
option, " ", ...
filename, " ", var_str; ] );
endfunction
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