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########################################################################
##
## Copyright (C) 2013-2024 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this
## distribution or <https://octave.org/copyright/>.
##
## This file is part of Octave.
##
## Octave 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.
##
## Octave 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 Octave; see the file COPYING. If not, see
## <https://www.gnu.org/licenses/>.
##
########################################################################
## -*- texinfo -*-
## @deftypefn {} {[filename, ext, cmap, options] =} imwrite_filename (@var{varargin})
##
## The input check for @code{imwrite} needs to be done twice, once when
## @code{imwrite} is called the first time to find where the filename is, and a
## second time by @code{__imwrite__} after imformats decides what function to
## use. Because a user can, and is encouraged to, get a function handle to
## @code{__imwrite__}, the input check is also done there.
##
## In addition, the input check for @code{imwrite} is not that straightforward
## in order to support the multiple ways the function can be called, and
## interpretations of @sc{matlab} documentation.
##
## Anyway, this will only do the input check until it finds the filename
## to be used, the only part that @code{imwrite} actually needs.
## @seealso{imwrite}
## @end deftypefn
function [filename, ext, cmap, options] = imwrite_filename (varargin)
## First, we check if the first argument is a colormap or a filename.
cmap = [];
if (ischar (varargin{1}))
filename_idx = 1;
elseif (numel (varargin) >= 2
&& iscolormap (varargin{1}) && ischar (varargin{2}))
filename_idx = 2;
cmap = varargin{1};
else
error ("imwrite: no FILENAME specified");
endif
filename = tilde_expand (varargin{filename_idx});
## Next, we get the file extension.
## if we have an odd number of leftover arguments, and the next argument
## is a string, we consider it the file extension. Otherwise we will
## extract what we can from the previously found filename.
options_idx = filename_idx + 1;
if (numel (varargin) > filename_idx
&& rem (length (varargin) - filename_idx, 2) != 0
&& ischar (varargin{filename_idx + 1}))
ext = varargin{filename_idx + 1};
options_idx += 1;
else
[~, ~, ext] = fileparts (filename);
if (! isempty (ext))
## remove dot from extension
ext = ext(2:end);
endif
endif
## After all the work finding where the filename was, we might as well
## send the leftovers list (they should be in key value pairs)
options = varargin(options_idx:end);
endfunction
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