% ----------------------------------------------------------------------------
% the XSIM package
% 
%   eXercise Sheets IMproved
% 
% ----------------------------------------------------------------------------
% Clemens Niederberger
% Web:    https://github.com/cgnieder/xsim
% E-Mail: contact@mychemistry.eu
% ----------------------------------------------------------------------------
% Copyright 2017 Clemens Niederberger
% 
% This work may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either version 1.3
% of this license or (at your option) any later version.
% The latest version of this license is in
%   http://www.latex-project.org/lppl.txt
% and version 1.3 or later is part of all distributions of LaTeX
% version 2005/12/01 or later.
% 
% This work has the LPPL maintenance status `maintained'.
% 
% The Current Maintainer of this work is Clemens Niederberger.
% ----------------------------------------------------------------------------
% If you have any ideas, questions, suggestions or bugs to report, please
% feel free to contact me.
% ----------------------------------------------------------------------------
\RequirePackage {expl3,xparse}

\ExplSyntaxOn

\tl_const:Nn \c_xsim_date_tl                 {2017/05/19}
\tl_const:Nn \c_xsim_version_major_number_tl {0}
\tl_const:Nn \c_xsim_version_minor_number_tl {8}
\tl_const:Nn \c_xsim_version_subrelease_tl   {a}
\tl_const:Nx \c_xsim_version_number_tl
  {
    \c_xsim_version_major_number_tl .
    \c_xsim_version_minor_number_tl
  }
\tl_const:Nx \c_xsim_version_tl
  {
    \c_xsim_version_number_tl
    \c_xsim_version_subrelease_tl
  }
\tl_const:Nn \c_xsim_info_tl {eXercise ~ Sheets ~ IMproved}

\ProvidesExplPackage
  {xsim}
  {\c_xsim_date_tl}
  {\c_xsim_version_tl}
  {\c_xsim_info_tl}

% --------------------------------------------------------------------------

% options, information
  
\bool_new:N \g_xsim_final_bool
\bool_new:N \g_xsim_verbose_bool
\bool_new:N \g_xsim_clear_aux_bool

\keys_define:nn {xsim}
  {
    final .bool_gset:N = \g_xsim_final_bool ,
    verbose .bool_gset:N = \g_xsim_verbose_bool ,
    clear-aux .bool_gset:N = \g_xsim_clear_aux_bool
  }

\DeclareOption {final}
  { \bool_gset_true:N \g_xsim_final_bool }

\DeclareOption {verbose}
  { \bool_gset_true:N \g_xsim_verbose_bool }

\DeclareOption {clear-aux}
  { \bool_gset_true:N \g_xsim_clear_aux_bool }

\ProcessOptions \scan_stop:

% --------------------------------------------------------------------------

% messages:
\msg_new:nnn {xsim} {rerun}
  {
    Exercise~ properties~ may~ have~ changed.~ Rerun~ to~ get~ them~
    synchronized.
  }

\msg_new:nnn {xsim} {verbose} { #1 ~(\msg_line_context:) }

% --------------------------------------------------------------------------

\bool_new:N \g__xsim_rerun_bool

\cs_new_protected:Npn \xsim_do_rerun:
  { \xsim_if_rerun:T { \msg_warning:nn {xsim} {rerun} } }

% --------------------------------------------------------------------------

% load module mechanism:
\tl_set:Nn \l_tmpa_tl {code.tex}
\@onefilewithoptions {xsim.modules} [][] \l_tmpa_tl

% --------------------------------------------------------------------------
\xsim_load_modules:n {definitions}

\AtEndDocument { \xsim_do_rerun: }

\tex_endinput:D
