[Tex/LaTex] minipage within fullwidth

fullwidthindentationminipage

I'm using Marco Daniel's fullwidth package, detailed in this answer. I want all of my text in fullwidth to be inseparable (and to begin and end with long black lines), so I am currently doing the following:

\documentclass[11pt,a4paper]{memoir}

\usepackage[outermargin=-4cm,]{fullwidth}

\begin{document}

\begin{minipage}{\linewidth}
\begin{fullwidth}[width=\linewidth+4cm]
\medskip

This is very long, but because it is in the fullwidth environment,
it extends into the full length of the page
before a line break occurs.

\medskip
\end{fullwidth}
\end{minipage}

\end{document}

This works, but it does give me the following warnings:

" fullwidth uses option nobreak Warning: \def on input line 15"

"Package fullwidth Warning: The environment is empty
(fullwidth) on input line 15."

along with an

"Overfull \hbox"…

These warning do not occur when I remove the minipage command. What is causing these warning, and how can I get rid of them?

Also, can I define a macro so that whenever I just write \begin{fullwidth}, LaTeX will automatically do \begin{minipage}{\linewidth} \begin{fullwidth}[width=\linewidth+4cm] \medskip?

UPDATE:

@cmhughes provided a perfect solution to the "define a macro" question. However, his use of the nobreak option in fullwidth instead of using minipage doesn't work. Here's the gist of the problem with it:

If I use [leftmargin = -4cm] OR [outermargin = -4cm], then the fullwidth text extends into the correct margin (the outer margin) on odd pages, and the incorrect margin (the inner margin) on even pages. If I use [rightmargin = -4cm] OR [innermargin = -4cm], then the fullwidth text extends into the correct margin (the outer margin) on even pages, and the incorrect margin (the inner margin) on odd pages. Herein lies the problem: the nobreak option messes up relative positioning, so that outermargin and innermargin only behave like leftmargin and rightmargin.

Please read the comments on his answer for a more detailed discussion. As of now, I'm looking for something that can fix the warnings given by using minipage, or that can use the nobreak option correctly…

Best Answer

I'm not sure I really understand the problem, but if you want to put some unbreakable stuff in fullpage (or anything) I'd have expected the minipage to be inside the environment rather than outside it.

\begin{fullwidth}[width=\linewidth+4cm]
\noindent\begin{minipage}{\linewidth}

generates no warnings and produces a plausible output.

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