function dynare(fname, varargin)
%       This command runs dynare with specified model file in argument
%       Filename.
%       The name of model file begins with an alphabetic character,
%       and has a filename extension of .mod or .dyn.
%       When extension is omitted, a model file with .mod extension
%       is processed.
%
% INPUTS
%   fname:      file name
%   varargin:   list of arguments following fname
%
% OUTPUTS
%   none
%
% SPECIAL REQUIREMENTS
%   none

% Copyright (C) 2001-2020 Dynare Team
%
% This file is part of Dynare.
%
% Dynare 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.
%
% Dynare 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 Dynare.  If not, see <http://www.gnu.org/licenses/>.

if ~nargin || strcmpi(fname,'help')
    skipline()
    disp(['This is Dynare version ' dynare_version() '.'])
    skipline()
    disp('USAGE: dynare FILENAME[.mod,.dyn] [OPTIONS]')
    skipline()
    disp('The dynare command executes instruction included in FILENAME.mod.')
    disp('See the reference manual for the available options.')
    skipline()
    return
end

% The following needs to come early, to avoid spurious warnings (especially under Octave)
warning_config;

% Handle nopathchange option
% Note that it is only handled if it appears on the command-line, and not at
% the top of the .mod file (since the treatment needs to take place very early,
% even before we make the various checks on the filename)
change_path_flag = true;
if nargin>1
    id = ismember(varargin, 'nopathchange');
    if any(id)
        change_path_flag = false;
        varargin(id) = [];
    end
end
check_matlab_path(change_path_flag);

% Detect if MEX files are present; if not, use alternative M-files
dynareroot = dynare_config();

if isoctave
    % The supported_octave_version.m file is not in git nor in the source
    % package, it is manually added in binary packages distributed on dynare.org
    if exist('supported_octave_version', 'file') && ~strcmp(supported_octave_version, version)
        skipline()
        warning(['This version of Octave is not supported. Consider installing ' ...
                 'version %s of Octave\n' ...
                 'from www.octave.org, otherwise m files will be used instead ' ...
                 'of precompiled mex files and some\nfeatures, like solution ' ...
                 'of models approximated at third order, will not be available.'], supported_octave_version())
        skipline()
    elseif octave_ver_less_than('4.2') % Should match the test in mex/build/octave/configure.ac
                                       % and in m4/ax_mexopts.m4
        skipline()
        warning(['This version of Dynare has only been tested on Octave 4.2 and above. Dynare may fail to run or give unexpected result. Consider upgrading your version of Octave.'])
        skipline()
    end
else
    if matlab_ver_less_than('7.9') % Should match the test in mex/build/matlab/configure.ac
        skipline()
        warning('This version of Dynare has only been tested on MATLAB 7.9 (R2009b) and above. Since your MATLAB version is older than that, Dynare may fail to run, or give unexpected results. Consider upgrading your MATLAB installation, or switch to Octave.');
        skipline()
    end
end

% disable output paging (it is on by default on Octave)
more off

% sets default format for save() command
if isoctave
    save_default_options('-mat')
end

if nargin < 1
    error('Dynare: you must provide the name of the .mod file in argument')
end

if ~ischar(fname)
    error('Dynare: argument of dynare must be a text string')
end

% Testing if filename has more than one period (not allowed).
dot_location=strfind(fname,'.');
if length(dot_location)>1
    error('Dynare: Periods in filenames are only allowed for .mod or .dyn extensions')
end

if dot_location==length(fname)
    error('Dynare: Periods in filenames are only allowed for .mod or .dyn extensions')
end

% Add dyn or mod extension to the file name if not already provided.
if isempty(dot_location)
    fnamelength = length(fname);
    fname1 = [fname '.dyn'];
    d = dir(fname1);
    if length(d) == 0
        fname1 = [fname '.mod'];
    end
    fname = fname1;
else
    % Check provided file extension.
    if ~strcmpi(fname(dot_location+1:end), 'mod') && ~strcmpi(fname(dot_location+1:end), 'dyn')
        error('Dynare: argument must be a filename with .mod or .dyn extensions')
    end
    fnamelength = length(fname) - 4;
end

if fnamelength + length('.set_auxiliary_variables') > namelengthmax()
    error('Dynare: the name of your .mod file is too long, please shorten it')
end

% Workaround for a strange bug with Octave: if there is any call to exist(fname)
% before the call to the preprocessor, then Octave will use the old copy of
% the .m instead of the newly generated one. Deleting the .m beforehand
% fixes the problem.
if isoctave && length(dir([fname(1:(end-4)) '.m'])) > 0
    delete([fname(1:(end-4)) '.m'])
end

if ~isempty(strfind(fname,filesep))
    fprintf('\nIt seems you are trying to call a .mod file not located in the "Current Folder". This is not possible (the %s symbol is not allowed in the name of the .mod file).\n', filesep)
    [pathtomodfile,basename] = fileparts(fname);
    if exist(pathtomodfile,'dir')
        filesindirectory = dir(pathtomodfile);
        filesindirectory = struct2cell(filesindirectory);
        filesindirectory = filesindirectory(1,:);
        if ~isempty(strmatch([basename '.mod'],filesindirectory)) || ~isempty(strmatch([basename '.dyn'],filesindirectory))
            fprintf('Please set your "Current Folder" to the folder where the .mod file is located using the following command:\n')
            fprintf('\n  >> cd %s\n\n',pathtomodfile)
        else
            fprintf('The file %s[.mod,.dyn] could not be located!\n\n',basename)
        end
    end
    error(['Dynare: can''t open ' fname, '.'])
end

if ~exist(fname,'file') || isequal(fname,'dir')
    fprintf('\nThe file %s could not be located in the "Current Folder". Check whether you typed in the correct filename\n',fname)
    fprintf('and whether the file is really located in the "Current Folder".\n')
    try
        list_of_mod_files = ls('*.mod');
        fprintf('\nCurrent folder is %s, and contains the following .mod files:\n\n',pwd)
        disp(list_of_mod_files)
    catch
        fprintf('\nCurrent folder is %s, and does not contain any .mod files.\n\n',pwd)
    end
    error(['Dynare: can''t open ' fname])
end

if ~isvarname(fname(1:end-4))
    error('Dynare: argument of dynare must conform to MATLAB''s convention for naming functions, i.e. start with a letter and not contain special characters. Please rename your .mod file.')
end

% pre-dynare-preprocessor-hook
if exist(fname(1:end-4),'dir') && exist([fname(1:end-4) filesep 'hooks'],'dir') && exist([fname(1:end-4) filesep 'hooks/priorprocessing.m'],'file')
    run([fname(1:end-4) filesep 'hooks/priorprocessing'])
end

% Parse some options, either for the command-line or from the top of the .mod file
file_opts = parse_options_line(fname);
preprocessoroutput = ~ismember('nopreprocessoroutput', varargin) && ...
                     ~ismember('nopreprocessoroutput', file_opts);
nolog = ismember('nolog', varargin) || ismember('nolog', file_opts);
onlymacro = ismember('onlymacro', varargin) || ismember('onlymacro', file_opts);
onlyjson = ismember('onlyjson', varargin) || ismember('onlyjson', file_opts);

if ispc
    arch = getenv('PROCESSOR_ARCHITECTURE');
else
    [~, arch] = system('uname -m');
end

if isempty(strfind(arch, '64'))
    arch_ext = '32';
    if preprocessoroutput
        disp('Using 32-bit preprocessor');
    end
else
    arch_ext = '64';
    if preprocessoroutput
        disp('Using 64-bit preprocessor');
    end
end

if preprocessoroutput
    fprintf(['Starting Dynare (version ' dynare_version() ').\n']);
    fprintf('Calling Dynare with arguments: ');
    if isempty(varargin)
        disp('none')
    else
        disp(strjoin(varargin, ' '));
    end
end

command = ['"' dynareroot 'preprocessor' arch_ext filesep 'dynare_m" ' fname] ;
command = [ command ' mexext=' mexext ' "matlabroot=' matlabroot '"'];
% Properly quote arguments before passing them to the shell
if ~isempty(varargin)
    varargincopy = varargin;
    % Escape backslashes and double-quotes
    varargincopy = strrep(varargincopy, '\', '\\');
    varargincopy = strrep(varargincopy, '"', '\"');
    if ~ispc
        % On GNU/Linux and macOS, also escape dollars and backquotes
        varargincopy = strrep(varargincopy, '$', '\$');
        varargincopy = strrep(varargincopy, '`', '\`');
    end
    % Finally, enclose arguments within double quotes
    dynare_varargin = ['"' strjoin(varargincopy, '" "') '"'];
    command = [command ' ' dynare_varargin];
end

% Under Windows, make sure the MEX file is unloaded (in the use_dll case),
% otherwise the preprocessor can't recompile it
if isoctave
    clear([fname(1:end-4) '.static'], [fname(1:end-4) '.dynamic'])
else
    clear(['+' fname(1:end-4) '/static'], ['+' fname(1:end-4) '/dynamic'])
end

[status, result] = system(command);
if status ~= 0 || preprocessoroutput
    disp(result)
end
if onlymacro
    if preprocessoroutput
        disp('Preprocessor stopped after macroprocessing step because of ''onlymacro'' option.');
    end
    return
end

if onlyjson
    if preprocessoroutput
        disp('Preprocessor stopped after preprocessing step because of ''onlyjson'' option.');
    end
    return;
end

% post-dynare-prerocessor-hook
if exist(fname(1:end-4),'dir') && exist([fname(1:end-4) filesep 'hooks'],'dir') && exist([fname(1:end-4) filesep 'hooks/postprocessing.m'],'file')
    run([fname(1:end-4) filesep 'hooks/postprocessing'])
end

% Save preprocessor result in logfile (if `no_log' option not present)
if ~nolog
    logname = [fname(1:end-4) '.log'];
    fid = fopen(logname, 'w');
    fprintf(fid, '%s', result);
    fclose(fid);
end

if status
    % Should not use "error(result)" since message will be truncated if too long
    error('Dynare: preprocessing failed')
end

if ~ isempty(find(abs(fname) == 46))
    fname = fname(:,1:find(abs(fname) == 46)-1) ;
end

% We need to clear the driver (and only the driver, because the "clear all"
% within the driver will clean the rest)
clear(['+' fname '/driver'])

evalin('base',[fname '.driver']) ;

end

% Looks for an options list in the first non-empty line of the .mod file
% Should be kept in sync with the function of the same name in preprocessor/src/DynareMain.cc
%
% Note that separating options with commas is accepted, but is deprecated (and undocumented)
%
% Also, the parser does not handle correctly some corner cases: for example, it
% will fail on something like -Dfoo="a b,c" (will split at whitespace and comma)
function opts = parse_options_line(fname)
    opts = {};
    fid = fopen(fname, 'r');
    while true
        firstline = fgetl(fid);
        if firstline == -1
            fclose(fid);
            return
        end
        if ~isempty(firstline)
            break
        end
    end
    fclose(fid);
    t = regexp(firstline, '^\s*//\s*--\+\s*options:([^\+]*)\+--', 'tokens');
    if isempty(t)
        return
    end

    opts = regexp(t{1}{1}, '[^,\s]+', 'match');

    if ismember(opts, 'nopathchange')
        warning('The ''nopathchange'' option is not taken into account when it appears at the top of ''.mod'' file. You should rather pass it on the command-line.')
    end
end
