function Struct = ini2struct(filename)
% Parses .ini file
% Returns a structure with section names and keys as fields.
%
% Based on init2struct.m by Andriy Nych
% 2014/02/01
%
% robustified by Michael Hirsch 2020
arguments
  filename (1,1) string {mustBeFile}
end

f = fopen(filename,'r');                    % open file

while ~feof(f)                              % and read until it ends
  s = strtrim(fgetl(f));                  % remove leading/trailing spaces
  if is_comment(s) % skip empty & comments lines
    continue
  end
  if s(1)=='['                            % section header
    Section = matlab.lang.makeValidName(strtok(s(2:end), ']'));
    Struct.(Section) = [];              % create field
    continue
  end

  [Key,Val] = strtok(s, '=');             % Key = Value ; comment
  Val = strtrim(Val(2:end));              % remove spaces after =

  if is_comment(Val) % empty entry
    Val = [];
  elseif Val(1)=='"'                      % double-quoted string
    Val = strtok(Val, '"');
  elseif Val(1)==''''                     % single-quoted string
    Val = strtok(Val, '''');
  else
    Val = strtok(Val, ';');             % remove inline comment
    Val = strtok(Val, '#');             % remove inline comment
    Val = strtrim(Val);                 % remove spaces before comment

    [val, status] = str2num(Val);
    if status, Val = val; end           % convert string to number(s)
  end

  if ~exist('Section', 'var')             % No section found before
    Struct.(matlab.lang.makeValidName(Key)) = Val;
  else                                    % Section found before, fill it
    Struct.(Section).(matlab.lang.makeValidName(Key)) = Val;
  end

end

fclose(f);

end % function


function i = is_comment(line)
% a comment line detected

i = isempty(line) || any(startsWith(line, [";", "#"]));

end

% Copyright (c) 2014, freeb
% Copyright (c) 2008, Andriy Nych
% Copyright (c) 2009-2010, Evgeny Prilepin aka Iroln
% All rights reserved.

% Redistribution and use in source and binary forms, with or without
% modification, are permitted provided that the following conditions are
% met:

%     * Redistributions of source code must retain the above copyright
%       notice, this list of conditions and the following disclaimer.
%     * 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
%     * Neither the name of the  nor the names
%       of its contributors may be used to endorse or promote products derived
%       from this software without specific prior written permission.

% 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 OWNER 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.
