%%%==============================================================================
%% Copyright 2022-present by Alceu Frigeri
%%
%% This work may be distributed and/or modified under the conditions of
%%
%% * The [LaTeX Project Public License](http://www.latex-project.org/lppl.txt),
%%   version 1.3c (or later), and/or
%% * The [GNU Affero General Public License](https://www.gnu.org/licenses/agpl-3.0.html),
%%   version 3 (or later)
%%
%% This work has the LPPL maintenance status *maintained*.
%%
%% The Current Maintainer of this work is Alceu Frigeri
%%
%% This is version {2.13a} {2026/07/04}
%%
%% The list of files that compose this work can be found in the README.md file at
%% https://ctan.org/pkg/ufrgscca
%%
%%%==============================================================================
%% UFRGS stands for "Federal University of Rio Grande do Sul" in south Brazil
%% EE    stands for "Engineering School"
%% CCA   stands for "Control and Automation Engineering Course" (Portuguese acronym)
%%%==============================================================================
\NeedsTeXFormat{LaTeX2e}[2026/06/01]

%%%%%%%
%%%
%%% Just an attempt at having my package's info in a regular way
%%%   \pkginfograb_set:nn { <pkg-name>} { props } sets package info
%%%
%%%   \pkginfograbProvidesExplPackage { <pkg-name>} { props } sets package info
%%%     and calls \ProvidesExplPackage
%%%
%%%%%%%
\RequirePackage{pkginfograb}
\pkginfograbProvidesExplPackage {ufrgscca-abnt}
  { 
     name        = {ufrgscca-abnt} ,
     prefix      = {ufrgscca} ,
     date        = {2026/07/04},
     version     = {2.13a} ,
     description = {UFRGS/CCA abnt layout}
  }
%%%%%%%
%%% End of cut-n-paste
%%%%%%%

\keys_define:nn { ufrgscca.abnt }
  { 
        strict-abnt   .usage:n          = load ,
		strict-abnt   .bool_set:N       = \l__ufrgscca_strictabnt_bool ,

        pretextontoc  .usage:n          = load ,
        pretextontoc  .bool_set:N       = \l__ufrgscca_pretextontoc_bool ,

        yearsonly     .usage:n          = load ,
        yearsonly     .bool_set:N       = \l__ufrgscca_yearsonly_bool ,

		chapternopagenum  .usage:n      = load ,
		chapternopagenum  .bool_set:N   = \l__ufrgscca_chapternopagenum_bool ,

%		english       .usage:n          = load ,
%		english       .bool_set:N       = \l__ufrgscca_english_bool ,

		relnum        .usage:n          = load ,
		relnum        .bool_set:N       = \l__ufrgscca_relnum_bool ,

		repeatfields  .usage:n          = load ,
		repeatfields  .bool_set:N       = \l__ufrgscca_repeatfields_bool ,

		showframes    .usage:n          = load ,
		showframes    .bool_set:N       = \l__ufrgscca_showframes_bool ,

		showlabels    .usage:n          = load ,
		showlabels    .bool_set:N       = \l__ufrgscca_showlabels_bool ,

		tocdepth      .usage:n          = load ,
		tocdepth      .tl_set:N         = \l__ufrgscca_tocdepth_tl ,

		secdepth      .usage:n          = load ,
		secdepth      .tl_set:N         = \l__ufrgscca_secdepth_tl ,

		nomicrotype   .usage:n          = load ,
		nomicrotype   .bool_set:N       = \l__ufrgscca_nomicrotype_bool ,

		article       .usage:n          = load ,
		article       .bool_set:N       = \l__ufrgscca_article_bool ,
  }

\tl_set:Nn \l__ufrgscca_tocdepth_tl { 3 }
\tl_set:Nn \l__ufrgscca_secdepth_tl { 4 }

\ProcessKeyOptions[ufrgscca.abnt]\relax


%%%%%%%%%%%%%%%%%%%%%
%%% Packages Loading
%%%%%%%%%%%%%%%%%%%%%
\bool_if:NTF \l__ufrgscca_english_bool
  { 
    \RequirePackage[brazilian,main=english]{ babel }% see ufrgscca.cls in case of newtx* being loaded!
    %\addto\extraenglish{ \input{ ufrgscca-base-en.def }}
    \AtBeginDocument{ \selectlanguage{ english }\input{ ufrgscca-base-en.def }}%
  }
  { 
    \RequirePackage[english,main=brazilian]{ babel }% see ufrgscca.cls in case of newtx* being loaded!
    %\addto\extrabrazilian{ \input{ ufrgscca-base-ptBR.def }}
    \AtBeginDocument{ \selectlanguage{ brazilian }\input{ ufrgscca-base-ptBR.def }}%
  }
  
\RequirePackage{ csquotes }%

\bool_if:NTF \l__ufrgscca_strictabnt_bool
  { 
    \RequirePackage[a4paper,inner=2cm,outer=3cm,top=3cm,bottom=2cm,twoside]{ geometry }
  }
  { 
    \bool_if:NF \l__ufrgscca_nogeometry_bool
      { 
        \RequirePackage[a4paper,inner=2.5cm,outer=2.5cm,top=3cm,bottom=2cm,twoside]{ geometry }
      }
  }

\RequirePackage[toc,page,title]{ appendix }
\RequirePackage[pagestyles,clearempty]{ titlesec }
\RequirePackage{ titletoc }
\RequirePackage[inline]{ enumitem }

\RequirePackage{ chngcntr }


%
% using Expl3
\SetConsts{ %
    caption.width   = 0.75\textwidth ,
    note.width      =  0.635\textwidth ,
}

\RequirePackage[position=above,font=small,labelfont=bf,textfont=md,textfont+=sl,width=\UseConst{ caption.width }]{ caption }%

%%%
%%% commands for 'floats'
%%%
%
\NewDocumentCommand{ \sourcecitation }{ m }{ { \small{ \sourcename\ #1 }}}%
%
\newlength{ \noteindent }%%auxiliary length
\NewDocumentCommand{ \note }{ O{ }+m }
  { 
    { 
      \footnotesize
      \settowidth{ \noteindent }{ \notename#1:}
      \addtolength{ \noteindent }{ 3pt }
      \begin{ center }
        \begin{ minipage }{ \UseConst{ note.width }}
          { \parindent=-\the\noteindent\notename#1:\hspace{ 2.9pt }#2 }
        \end{ minipage }
      \end{ center }
    }
  }%%
%
%


%%%%%%%%%%%%%%%%%%%%%
%%% Packages Loading
%%%%%%%%%%%%%%%%%%%%%
\RequirePackage{ array }
\RequirePackage{ nicematrix }
\NiceMatrixOptions{ cell-space-limits = 1pt }

\newcolumntype{ P }[1]{ >{ \raggedleft\arraybackslash }p{ #1 }}
\newcolumntype{ B }[1]{ >{ \raggedleft\arraybackslash\bfseries }p{ #1 }}
\newcolumntype{ C }[1]{ >{ \centering\arraybackslash }p{ #1 }}
\newcolumntype{ R }[1]{ >{ \raggedleft\arraybackslash }p{ #1 }}
\newcolumntype{ L }[1]{ >{ \raggedright\arraybackslash }p{ #1 }}
\newcolumntype{ J }[1]{ >{ \arraybackslash }p{ #1 }}


%%%%%%%%%%%%%%%%%%%%%
%%% Packages Loading
%%%%%%%%%%%%%%%%%%%%%
\WarningFilter{ biblatex }{ File 'brazilian-abnt-abnt.lbx'}%
\WarningFilter{ biblatex }{ Conflicting options }%

\bool_if:NTF \l__ufrgscca_repeatfields_bool
  { 
    \RequirePackage[backend=biber,style=abnt,pretty,giveninits,extrayear,repeatfields]{ biblatex }%
  }
  { 
    \RequirePackage[backend=biber,style=abnt,pretty,giveninits,extrayear]{ biblatex }%
  }


%%



%%%
%%% typeset adjusting { package microtype }
%%%
\bool_if:NF \l__ufrgscca_timesroman_bool
  { 
    \bool_if:NF \l__ufrgscca_nomicrotype_bool
      { 
        \RequirePackage[tracking,kerning,spacing,babel]{ microtype }
      }
  }


% pdftex native protruding
%
\pdfprotrudechars=2
\pdfadjustspacing=2

%%%
%%% \so \ul command { package soul }... contour is just to make a fancy underline
%%%
\RequirePackage{ contour }
\RequirePackage{ soul }


\bool_if:NT \l__ufrgscca_showframes_bool
  { 
    \RequirePackage{ showframe }
  }
\bool_if:NT \l__ufrgscca_showlabels_bool
  { 
	\RequirePackage{ showlabels }
	\showlabels{ cite }
	\showlabels{ textcite }
	\RenewDocumentCommand{ \showlabelfont }{ }{ \tiny\ttfamily\color{ blue }}
  }




%%%
%%% ToC and Headings format. { package titlesec/titletoc/titleps }
%%%

\setcounter{ tocdepth }{ \l__ufrgscca_tocdepth_tl }  % Table of Contents depth
\setcounter{ secnumdepth }{ \l__ufrgscca_secdepth_tl } % Sectioning numbers depth (3 -> subsubsection)

\NewDocumentEnvironment{ tocless }{ }
   { 
     \setcounter{ secnumdepth }{ -1 }
     \addtocontents{ toc }{ \protect\setcounter{ tocdepth }{ -1 }\ignorespaces }
   }
   { 
     \setcounter{ secnumdepth }{ \l__ufrgscca_secdepth_tl }
     \addtocontents{ toc }{ \protect\setcounter{ tocdepth }{ \l__ufrgscca_tocdepth_tl }\ignorespaces }
   }
   
\def\notoc#1#2{ \begin{ tocless }#1{ #2 }\end{ tocless }}


\NewDocumentEnvironment{ numberless }{ }
  { 
    \setcounter{ secnumdepth }{ -1 }
  }
  { 
    \setcounter{ secnumdepth }{ \l__ufrgscca_secdepth_tl }
  }
  
\def\nonum#1#2{ \begin{ numberless }#1{ #2 }\end{ numberless }}



%%%
%%% Relative/Absolute numbering... argh !!!
%%%
  
  \def\l__ufrgscca_chapter_spacing_tl{ \vspace{ 2.5mm }}
  \def\l__ufrgscca_section_spacing_tl{ \vspace{ 0.75mm }}
  
  
\makeatletter  
\bool_if:NF \l__ufrgscca_article_bool
  { 
    \bool_if:NF \l__ufrgscca_relnum_bool
      { 
        \patchcmd{ \@chapter }{ \addtocontents{ lof }{ \protect\addvspace{ 10\p@}}}{ }{ }{ { PATCH ~FAILED }}% LoF ... to supress extra space (figures of diverse chapters)
        \patchcmd{ \@chapter }{ \addtocontents{ lot }{ \protect\addvspace{ 10\p@}}}{ }{ }{ { PATCH ~FAILED }}% LoT
      }
  }  



%%%
%%% ToC definitions { package titletoc }
%%%
\def\tc@lblmargin{ 22mm }
\contentsmargin{ 2.2em }
\def\tc@dotspacing{ 0.5pc }

%%%\def\tc@lblmargin{ 22mm }
%%%\contentsmargin{ 2.2em }
%%%\def\tc@dotspacing{ 0.5pc }


\titlecontents{ chapter }[\tc@lblmargin]
  { \l__ufrgscca_chapter_spacing_tl\normalfont\scshape\selectfont }
  { \contentslabel{ \tc@lblmargin }}
  { \hspace{ -\tc@lblmargin }}
  { \titlerule*[\tc@dotspacing]{ .}\normalsize\normalfont\contentspage }
  
\titlecontents{ section }[\tc@lblmargin]
  { \l__ufrgscca_section_spacing_tl }
  { \contentslabel{ \tc@lblmargin }}
  { \hspace{ -\tc@lblmargin }}
  { \titlerule*[\tc@dotspacing]{ .}\contentspage }

\dottedcontents{ subsection }[\tc@lblmargin]
  { }
  { \tc@lblmargin }
  { \tc@dotspacing }

\dottedcontents{ subsubsection }[\tc@lblmargin]
  { }
  { \tc@lblmargin }
  { \tc@dotspacing }

\dottedcontents{ figure }[\tc@lblmargin]
  { }
  { \tc@lblmargin }
  { \tc@dotspacing }
  
\dottedcontents{ table }[\tc@lblmargin]
  { }
  { \tc@lblmargin }
  { \tc@dotspacing }





\renewcommand{ \restoreapp }{ } % to reset appendix counters each time (from appendix doc)
\RenewDocumentEnvironment{ appendix }{ O{ \defappendixpagename }O{ \defappendixname }}
    { 
      \titleformat{ \chapter }
        { \bfseries\Large\sffamily }
        { #2~ \thechapter\hspace{ 1.5ex }-}
        { 2ex }
        { \MakeUppercase }%
			\titlecontents{ chapter }[\tc@lblmargin]
        { \vspace{ 3mm }\sc }
        { \hspace{ -\tc@lblmargin }{ #2\ ~\thecontentslabel\ ~ -\enspace }}
        { \hspace{ -\tc@lblmargin }}
        { \titlerule*[\tc@dotspacing]{ .}\normalsize\normalfont\contentspage }
		  \def\appendixname{ #2 }%
			\def\appendixpagename{ #1 }%
			\def\appendixtocname{ #1 }%
			\begin{ appendices }%
			  \let\tc@appendixautorefname@tmp\appendixautorefname
			  \def\appendixautorefname{ #2 }
		}
		{ 
        \let\appendixautorefname\tc@appendixautorefname@tmp
      \end{ appendices }
    }

\NewDocumentEnvironment{ annex }{ O{ \defannexpagename }O{ \defannexname }}
    { \begin{ appendix }[#1][#2]}
    { \end{ appendix }}


\makeatother



%%%
%%% Headings definitions { package titlesec }
%%%
%%%%\def\tc@chapbefore{ 70pt plus 12pt minus 8pt }
%%%%\def\tc@chapafter{ 36pt plus 8pt minus 8pt }
%%%%\def\tc@secbefore{ 27pt plus 6pt minus 6pt }
%%%%\def\tc@secafter{ 18pt plus 4pt minus 4pt }

\def\l__ufrgscca_chapter_before_skip{ 70pt plus 12pt minus 8pt }
\def\l__ufrgscca_chapter_after_skip{ 36pt plus 8pt minus 8pt }
\def\l__ufrgscca_section_before_skip{ 27pt plus 6pt minus 6pt }
\def\l__ufrgscca_section_after_skip{ 18pt plus 4pt minus 4pt }


%\RenewDocumentCommand{ \thechapter }{ }{ \arabic{ chapter }}
\titleformat{ \chapter }
    { \sffamily\bfseries\selectfont\Large }
    { \thechapter }
    { 2ex }
    { \MakeUppercase }
    
\titleformat{ name=\chapter,numberless }
    { \sffamily\bfseries\selectfont\Large\center }
    { }
    { 0pt }
    { \MakeUppercase }
    
\titlespacing{ \chapter }
    { 0pt }
    { \l__ufrgscca_chapter_before_skip }
    { \l__ufrgscca_chapter_after_skip }

%\def\l__ufrgscca_chapter_before_skip{ 18pt plus 3pt minus 6pt }
%\def\l__ufrgscca_chapter_after_skip{ 9pt plus 3pt minus 3pt }
%\def\l__ufrgscca_section_before_skip{ 12pt plus 6pt minus 3pt }
%\def\l__ufrgscca_section_after_skip{ 6pt plus 2pt minus 2pt }


\titleformat{ \section }[hang]
    { \normalfont\scshape\selectfont\large }
    { \thesection }
    { .5em }
    { }
    
\titlespacing{ \section }
    { 0pt }
    { \l__ufrgscca_section_before_skip }
    { \l__ufrgscca_section_after_skip }

\titleformat{ name=\section,numberless }[hang]
    { \normalfont\large\bfseries\scshape\selectfont\center }
    { }
    { 0pt }
    { }
    
\titlespacing{ name=\section,numberless }
    { 0pt }
    { \l__ufrgscca_section_before_skip }
    { \l__ufrgscca_section_after_skip }

\titleformat{ \subsection }[hang]
    { \normalfont\sffamily\bfseries\slshape\selectfont }
    { \thesubsection }
    { .5em }
    { }
    
\titlespacing{ \subsection }
    { 0pt }
    { \l__ufrgscca_section_before_skip }
    { \l__ufrgscca_section_after_skip }

\titleformat{ \subsubsection }[hang]
    { \normalfont\sffamily\slshape\selectfont }
    { \thesubsubsection }
    { .5em }
    { }
    
\titlespacing{ \subsubsection }
    { 0pt }
    { \l__ufrgscca_section_before_skip }
    { \l__ufrgscca_section_after_skip }

\titleformat{ \paragraph }[hang]
    { \normalfont\sffamily\selectfont }
    { \theparagraph }
    { .5em }
    { \tightul }
    
\titlespacing{ \paragraph }
    { 0pt }
    { \l__ufrgscca_section_before_skip }
    { \l__ufrgscca_section_after_skip }

\titleformat{ \subparagraph }[hang]
    { \normalfont\sffamily\selectfont }
    { \thesubparagraph }
    { .5em }
    { \tightul }
    
\titlespacing{ \subparagraph }
    { 0pt }
    { \l__ufrgscca_section_before_skip }
    { \l__ufrgscca_section_after_skip }

%%%
%%% Relative/Absolute counters... { package chngcntr }
%%%
\bool_if:NF \l__ufrgscca_article_bool
  { 
    \bool_if:NTF \l__ufrgscca_relnum_bool
      { 
          \counterwithin{ figure }{ chapter }
          \counterwithin{ table }{ chapter }
          \counterwithin{ equation }{ chapter }
      }
      { 
          \counterwithout{ figure }{ chapter }
          \counterwithout{ table }{ chapter }
          \counterwithout{ equation }{ chapter }
      }
  }



%%%
%%% Page Heading format { titlesec/titleps }
%%%
\renewpagestyle{ plain }
    { 
      \sethead[\ifthechapter{ \sffamily\thepage }{ }]  []  []
          { }
          { }
          {  
            \ifthechapter{ \sffamily\thepage }
              { }  
          }
    }
    
\newpagestyle{ main }
    { 
      \sethead[\ifthechapter{ \sffamily\thepage }{ }]  []  []
          { }
          { }
          { 
            \ifthechapter{ \sffamily\thepage }
              { }
          }
    }
    
\newpagestyle{ bibliography }
    { 
      \sethead[\sffamily\thepage]  []  []
          { }
          { }
          { 
            \sffamily\thepage
          }
    }
    
\pagestyle{ main }


\bool_if:NF \l__ufrgscca_chapternopagenum_bool
  { 
    \renewpagestyle{ plain }{ \sethead[][][]{ }{ }{ }}
  }

%%\iftcif@chapternopagenum\renewpagestyle{ plain }{ \sethead[][][]{ }{ }{ }}\fi

%% ????
%\let\tc@temp@printbibliography\printbibliography

\defbibheading{ bibliography }[\refname]{ \nonum\chapter{ #1 }\pagestyle{ bibliography }}


\bool_if:NT \l__ufrgscca_pretextontoc_bool
  { 
    \gappto{ \listoffigures }{ \addcontentsline{ toc }{ chapter }{ \textsc\listfigurename }}
    \gappto{ \listoftables }{ \addcontentsline{ toc }{ chapter }{ \textsc\listtablename }}
  }



\newlength{ \l__ufrgscca_label_width_dim }
\NewDocumentCommand{ \NewChapListEnv }{ mm }{ 
    \NewDocumentEnvironment{ #1 }{ O{ }m }{ %
        \settowidth{ \l__ufrgscca_label_width_dim }{ ##2***}%
        \bool_if:NTF \l__ufrgscca_pretextontoc_bool
          { 
            \nonum\chapter{ \textsc{ #2 }}
          }
          { 
            \notoc\chapter{ \textsc{ #2 }}
          }
        \begin{ description }[tcc,noindent,leftmargin=\l__ufrgscca_label_width_dim,labelwidth=!,##1]%
		}{ \end{ description }}
}

\NewChapListEnv{ listofabbrv }{ \listabbrvname }
\NewChapListEnv{ listofsymbols }{ \listsymbolname }


%%%
%%% lists formating { package enumitem }
%%%


\def\l__ufrgscca_enum_base_dim{ 6mm }
\def\l__ufrgscca_enum_margin_dim{ 12mm }
\def\l__ufrgscca_enum_margin_dimB{ 18mm }
\def\l__ufrgscca_enum_label_sep_dim{ 2.5mm }
\setlength{ \parindent }{ \l__ufrgscca_enum_margin_dim }

\SetEnumitemValue{ label }{ arabic }{ \arabic*.}
\SetEnumitemValue{ label }{ roman }{ \roman*.}
\SetEnumitemValue{ label }{ alpha }{ \alph*.}
\SetEnumitemValue{ label }{ bullet }{ \hfill\textopenbullet }

\SetEnumitemKey{ ppc }
    { leftmargin=\l__ufrgscca_enum_margin_dim,labelindent=\l__ufrgscca_enum_base_dim,labelsep=\l__ufrgscca_enum_label_sep_dim,labelwidth=!,style=nextline }
\SetEnumitemKey{ tcc }
    { leftmargin=\l__ufrgscca_enum_margin_dim,labelindent=\l__ufrgscca_enum_base_dim,labelsep=\l__ufrgscca_enum_label_sep_dim,labelwidth=!,style=nextline }
%
\SetEnumitemKey{ parindent }
    { leftmargin=\l__ufrgscca_enum_margin_dimB,labelindent=\l__ufrgscca_enum_margin_dim,labelwidth=!}
\SetEnumitemKey{ noindent }
    { labelindent=0pt,labelwidth=!}
\SetEnumitemKey{ tight }
    { leftmargin=0pt,listparindent=5mm,labelwidth=5mm }
%
\SetEnumitemKey{ miditemsep }
    { parsep=0ex,itemsep=0.4ex }

%\SetEnumitemKey{ ppctight }{ leftmargin=0pt,listparindent=5mm,labelwidth=5mm }


\SetEnumitemKey{ arabic }{ label=\arabic*.}
\SetEnumitemKey{ arabic)}{ label=\arabic*)}
\SetEnumitemKey{ (arabic)}{ label=(\arabic*)}
\SetEnumitemKey{ arabic*}{ label*=\arabic*.}
\SetEnumitemKey{ arabic*)}{ label*=\arabic*)}
\SetEnumitemKey{ roman }{ label=\roman*.}
\SetEnumitemKey{ roman)}{ label=\roman*)}
\SetEnumitemKey{ (roman)}{ label=(\roman*)}
\SetEnumitemKey{ roman*}{ label*=\roman*.}
\SetEnumitemKey{ roman*)}{ label*=\roman*)}
\SetEnumitemKey{ Roman }{ label=\Roman*.}
\SetEnumitemKey{ Roman)}{ label=\Roman*)}
\SetEnumitemKey{ (Roman)}{ label=(\Roman*)}
\SetEnumitemKey{ Roman*}{ label*=\Roman*.}
\SetEnumitemKey{ Roman*)}{ label*=\Roman*)}
\SetEnumitemKey{ alpha }{ label=\alph*.}
\SetEnumitemKey{ alpha)}{ label=\alph*)}
\SetEnumitemKey{ (alpha)}{ label=(\alph*)}
\SetEnumitemKey{ alpha*}{ label*=\alph*.}
\SetEnumitemKey{ alpha*)}{ label*=\alph*)}
\SetEnumitemKey{ Alpha }{ label=\Alph*.}
\SetEnumitemKey{ Alpha)}{ label=\Alph*)}
\SetEnumitemKey{ (Alpha)}{ label=(\Alph*)}
\SetEnumitemKey{ Alpha*}{ label*=\Alph*.}
\SetEnumitemKey{ Alpha*)}{ label*=\Alph*)}
\SetEnumitemKey{ bullet }{ label=\hfill\textopenbullet }

%%%
%%% tight underline { packages soul, countour }
%%%
\contourlength{ 0.17ex }%
\contournumber{ 96 }%

\NewDocumentCommand{ \tightul }{ m }{ %
  \setul{ 0.355ex }{ 0.075ex }%
  \ul{ { \phantom{ { #1 }}}}%
  \llap{ \contour{ white }{ #1 }}%
}

%%%
%%% keyword command definition (for abstract)
%%%

\seq_new:N \l__ufrgscca_keywords_seq
\seq_new:N \l__ufrgscca_other_keywords_seq
\seq_new:N \l__ufrgscca_keywords_tmpa_seq
\seq_new:N \l__ufrgscca_keywords_tmpb_seq

\NewDocumentCommand{ \mainkeywords }{ m }
  { 
    \seq_set_from_clist:Nn \l__ufrgscca_keywords_tmpa_seq { #1 }
    \seq_set_eq:NN \l__ufrgscca_keywords_tmpb_seq \l__ufrgscca_keywords_seq
    \seq_gconcat:NNN \l__ufrgscca_keywords_seq \l__ufrgscca_keywords_tmpb_seq \l__ufrgscca_keywords_tmpa_seq
  }
\let\keyword\mainkeywords

\NewDocumentCommand{ \lstkeywords }{ O{ ,~ }}
  { 
    \seq_sort:Nn \l__ufrgscca_keywords_seq 
      { 
        \str_compare:nNnTF { ##1 } > { ##2 }
          { \sort_return_swapped: }
          { \sort_return_same: }
      }
    \seq_use:Nn \l__ufrgscca_keywords_seq { #1 }
  }

\NewDocumentCommand{ \otherkeywords }{ m }
  { 
    \seq_set_from_clist:Nn \l__ufrgscca_keywords_tmpa_seq { #1 }
    \seq_set_eq:NN \l__ufrgscca_keywords_tmpb_seq \l__ufrgscca_other_keywords_seq
    \seq_gconcat:NNN \l__ufrgscca_other_keywords_seq \l__ufrgscca_keywords_tmpb_seq \l__ufrgscca_keywords_tmpa_seq
  }

\NewDocumentCommand{ \lstotherkeywords }{ O{ ,~ }}
  { 
    \seq_sort:Nn \l__ufrgscca_other_keywords_seq 
      { 
        \str_compare:nNnTF { ##1 } > { ##2 }
          { \sort_return_swapped: }
          { \sort_return_same: }
      }
    \seq_use:Nn \l__ufrgscca_other_keywords_seq { #1 }
  }


\bool_if:NTF \l__ufrgscca_oldrenews_bool
  { 
    \RenewDocumentEnvironment{ abstract }{ }
      { 
        \notoc\chapter{ \abstractname }
      }
      { 
        \par\vspace{ 2ex }
        \noindent\textbf{ \keywordsname :\ ~} \lstkeywords
      }
  }
  { 
    \NewDocumentEnvironment{ mainabstract }{ }
      { 
        \notoc\chapter{ \abstractname }
      }
      { 
        \par\vspace{ 2ex }
        \noindent\textbf{ \keywordsname :\ ~} \lstkeywords
      }
  }

\NewDocumentEnvironment{ otherabstract }{ O{ english }}
  { 
    \begin{ otherlanguage }{ #1 }
      \notoc\chapter{ \abstractname }
  }
  { 
      \par\vspace{ 2ex }
      \noindent\textbf{ \keywordsname :\ ~} \lstotherkeywords
    \end{ otherlanguage }%
  }



%%
%% if needed to be, double side.
%%
\cs_new_protected:Npn \__ufrgscca_clearpage: 
  { 
    \if@openright
      \cleardoublepage
    \else
      \clearpage  %TODO: why \@openright test is (sometimes) failing ?
    \fi 
  }

%
\bool_if:NTF \l__ufrgscca_yearsonly_bool
  { 
    \SetConsts
      { 
        publ.date = { \UseConst{ publ.year }} ,
        publ.monthyear = { \UseConst{ publ.month } ~ - ~ \UseConst{ publ.year }} ,
      }
  }
  { 
    \SetConsts
      { 
        publ.date = { \UseConst{ publ.month } ~ - ~ \UseConst{ publ.year }} ,
        publ.monthyear = { \UseConst{ publ.month } ~ - ~ \UseConst{ publ.year }} ,
      }
  }

%==============================================================================%
% date redefinition (separated month and year)
%==============================================================================%
\NewDocumentCommand{ \pubdate }{ O{ \number\day }mm }{ %
  \int_compare:nNnTF { #1 } < { 10 }
    { 
      \SetConsts{ %
        publ.month = { #2 } ,
        publ.year = { #3 } ,
        publ.day = { 0#1 } ,
      }
    }
    { 
      \SetConsts{ %
        publ.month = { #2 } ,
        publ.year = { #3 } ,
        publ.day = { #1 } ,
      }
    }
}%
\pubdate{ \monthname }{ \number\year }%
\bool_if:NT \l__ufrgscca_oldrenews_bool
  { 
    \RenewDocumentCommand{ \date }{ O{ \number\day }mm }{ \pubdate[#1]{ #2 }{ #3 }}%
  }


\bool_if:NTF \l__ufrgscca_english_bool
  { 
  	\def\today{ \monthname\space\number\day,\space\number\year }
  	\def\monthname{ 
  		\ifcase\month\or
  			January\or February\or March\or April\or
  			May\or June\or July\or August\or September\or
  			October\or November\or December
  		\fi
    }
    \cs_new_protected:Npn \__ufrgscca_weekday:n #1 
      { 
        \int_case:nnF { #1 }
          { 
            { 0 }{ Monday }
            { 1 }{ Tuesday }
            { 2 }{ Wednsday }
            { 3 }{ Thursday }
            { 4 }{ Friday }
            { 5 }{ Saturday }
            { 6 }{ Sunday }
          }
          { -none-}
      }
  }
  { 
  	\def\today{ \number\day\space de\space\monthname\space de\space\number\year }
  	\def\monthname{ 
  		\ifcase\month\or
  			Janeiro\or Fevereiro\or Março\or Abril\or
  			Maio\or Junho\or Julho\or Agosto\or Setembro\or
  			Outubro\or Novembro\or Dezembro
  		\fi
    }
    \cs_new_protected:Npn \__ufrgscca_weekday:n #1 
      { 
        \int_case:nnF { #1 }
          { 
            { 0 }{ Segunda }
            { 1 }{ Terça }
            { 2 }{ Quarta }
            { 3 }{ Quinta }
            { 4 }{ Sexta }
            { 5 }{ Sábado }
            { 6 }{ Domingo }
          }
          { -none-}
      }
  }