paulo@temperantia profile.d$ cat texlive.sh
#!/bin/bash
pathmunge () {
        if ! echo $PATH | /bin/egrep -q "(^|:)$1($|:)" ; then
           if [ "$2" = "after" ] ; then
              PATH=$PATH:$1
           else
              PATH=$1:$PATH
           fi
        fi
}
pathmunge /opt/texbin
unset pathmunge

! Missing \endcsname inserted.
<to be read again>
                   \protect
l.360 <B>identifier:
                    <A> makefoo
?

\documentclass{memoir}

\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}

\usepackage{listings}
\usepackage{xcolor}

\definecolor{bluekeywords}{rgb}{0.13,0.13,1}
\definecolor{greencomments}{rgb}{0,0.5,0}
\definecolor{redstrings}{rgb}{0.9,0,0}

\lstnewenvironment{yaml}{\lstset{%
   basicstyle=\ttfamily,
   numbers=left,
   xleftmargin=1.5em,
   numberstyle=\color{brown}\ttfamily\small,
   columns=flexible,
   mathescape=false,
   escapechar=|,
   literate={<B>}{\color{bluekeywords}}0
			{<R>}{\color{redstrings}}0

   literate={<B>}{\color{bluekeywords}}1
			{<R>}{\color{redstrings}}1
                {<G>}{\color{greencomments}}1
	           {<A>}{\normalcolor}1,

   literate={<B>}{\color{bluekeywords}}{-1}
			{<R>}{\color{redstrings}}{-1}
            {<G>}{\color{greencomments}}{-1}
	        {<A>}{\normalcolor}{-1}

ifnum\lst@length=\z@\else

\documentclass{article}
\usepackage{listings}
\usepackage{xcolor}

\lstnewenvironment{yaml}{\lstset{%
   basicstyle=\ttfamily,
   columns=flexible,
   literate={<B>}{\color{blue}}0
	        {<A>}{\normalcolor}0
}}{}

\lstnewenvironment{latex}{\lstset{%
%   language=[LaTeX]TeX,
   basicstyle=\ttfamily,
   columns=flexible,
}}{}

\begin{document}

\begin{latex}
\documentclass{article}
\begin{document}
Hello world.
\end{document}
\end{latex}

\begin{yaml}
<B>name:<A> paulo
<B>country:<A> brazil
\end{yaml}

\begin{tikzpicture}[every node/.style={inner sep=0,draw,outer sep=0}]
\node at (0,0) (a) {};
\node at (3,0) (b) {};
\node at (3,3) (c) {};
\node at (0,3) (d) {};
\coordinate (A) at (7,0);
\coordinate (B) at (10,0);
\coordinate (C) at (10,3);
\coordinate (D) at (7,3);
\draw[fill=black!10] (a) -- (b) -- (c) -- (d) -- cycle;
\end{tikzpicture}

\begin{tikzpicture}[every node/.style={inner sep=0,outer sep=0,fill=none}]
\node at (0,0) (a) {};
\node at (3,0) (b) {};
\node at (3,3) (c) {};
\node at (0,3) (d) {};
\draw[fill=black!10] (a) -- (b) -- (c) -- (d) -- (a);
\end{tikzpicture}

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{automata,backgrounds}
\begin{document}
\begin{tikzpicture}
\node[state] at (0,0) (a) {a};
\node[state] at (3,0) (b) {b};
\node[state] at (3,3) (c) {c};
\node[state] at (0,3) (d) {d};

\path[->] (a) edge (b)
(b) edge (c)
(c) edge (d)
(d) edge (a);
\begin{scope}[on background layer]
\fill[black!10] (a.center) -- (b.center) -- (c.center) -- (d.center) -- cycle;
\end{scope}
\end{tikzpicture}
\end{document}

Sort of code:

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{shapes.stix}
\begin{document}
\begin{tikzpicture}
\node[stix=T,draw,fill=gold] (T) {};
\node[stix=i,draw,right=of T,fill=gold] (i) {};
\node[stix/shape=italic,stix=k,draw,right=of i,fill=gold] (k) {};
\node[stix=Z,draw,right=of k,fill=gold] (Z) {};
\end{tikzpicture}
\end{document}