%---- preamble-chunk.tex -----------------------------------------------

% Knitr.

% ATTENTION: this needs `\usepackage{xcolor}'.
\definecolor{color_line}{HTML}{333333}
\definecolor{color_back}{HTML}{DDDDDD}

% R input.
\ifcsmacro{Highlighting}{
  % Statment if it exists. ------------------
  \DefineVerbatimEnvironment{Highlighting}{Verbatim}{
    frame=lines,
    framesep=1ex,
    framerule=0.5pt,
    rulecolor=\color{color_line},
    numbers=right,
    fontsize=\footnotesize,
    baselinestretch=0.75,
    commandchars=\\\{\}}
  % Margens do ambiente `Shaded'.
  % \fvset{listparameters={\setlength{\topsep}{-1em}}}
  \renewenvironment{Shaded}{\vspace{-1ex}}{\vspace{-2ex}}
  }{
  % Statment if it not exists. --------------
}

% R output e todo `verbatim'.
\makeatletter
\def\verbatim@font{\linespread{0.75}\normalfont\ttfamily\footnotesize}
\makeatother

% Cor de fundo e margens do `vertabim'.
\let\oldv\verbatim
\let\oldendv\endverbatim

\def\verbatim{%
  \par\setbox0\vbox\bgroup
  \vspace{-1.5\topsep}
  \oldv
}
\def\endverbatim{%
  \oldendv
  \vspace{-0.9\topsep}
  \egroup\fboxsep0pt
  \noindent{\colorbox{color_back}{\usebox0}}\par
}

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