\subsection{Grabbing an Environment Verbatim}
\begin{function}{\enverb}
  \begin{syntax}
    \cs{enverb}\marg{key=value}\oarg{key=value}
    \cs{enverb}\meta{*}\marg{key=value}
  \end{syntax}
  This function will store the contents of the enclosing environment verbatim
  inside of \cs{enverbBody}. It should be the last thing you invoke inside the
  |\begin| code of your environment and mustn't be enclosed in any nested
  environment. Both the mandatory and the optional \meta{key=value} argument are
  parsed by \cs{enverb} -- see \autoref{sec:keys} about the specifics of this.
  The mandatory argument is meant for a package/code developer to assign the
  sensible default values for the envisioned functionality and always parsed
  inside the keyset of \cs{enverb}, while the optional one is meant to be used
  by the user and as such should be the first thing inside the enclosing
  environment (if the user wants to use an optional argument).\par
  \cs{enverb} sets the special characters
  \begingroup
    \def\do#1%
      {%
        \ifx\ #1\else
          , \texttt{\csname @gobble\expandafter\endcsname\string#1}%
        \fi
      }%
    \csname @secondoftwo\expandafter\endcsname\romannumeral`\^^@\dospecials
  \endgroup
  \ to the category code 12 (other), and makes both spaces and tabulators active
  tokens. By default each line break will be a category code 12 carriage return
  (character code 13), but see the |eol| option in \autoref{sec:keys}.\par
  A line that contains only whitespace on input will be output as an empty
  line.\par
  The \cs{enverb} syntax of the optional argument has a few peculiarities. It is
  scanned for the opening bracket either on the same line as the |\begin|
  statement of the enclosing environment, or on any subsequent line until a
  non-whitespace character is found. The optional argument is read using the
  \enquote{normal} (so surrounding) category code regime, but it is scanned for
  it in a way that the first token is still read verbatim if no optional
  argument was given.\par
  The first non-whitespace token that's not an opening bracket must not be found
  on the same line as the |\begin| statement, and if there was an optional
  argument there shouldn't be any non-whitespace token trailing it in that line.
  Additionally there should be no non-whitespace material following the |\end|
  statement (anything preceding it in the same line is for the most part
  ignored; |\begin| and |\end| are not balanced, the first |\end| with the
  correct environment as argument terminates scanning).\par
  The starred version of \cs{enverb} doesn't search for an optional argument.
\end{function}