\documentclass[11pt]{article}{% load tex_tools %}{% autoescape off %}
\begin{document}

% Here are two ways to deal with curly braces, if you don't want spaces around the variable.
\title{\relax {{ title }}}
\author{% templatetag openbrace %}{{ author|texify }}}
\date{\today}
\maketitle

Blah blah blah!

$$
\log x = \int_1^x\frac{dt}{t}
$$

\input{aninput.tex}

\end{document}
{% endautoescape %}