Disable linebreaks in \texttt while using underscore package

Question

The \texttt normally does not lead to automatic hyphenation or linebreaks. However, it apparently does when using the underscore package:

\documentclass{article}
\usepackage[nohyphen]{underscore}
\begin{document}

Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam diam \texttt{_nonumynonumy} eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua.

\end{document}

Results in

The underscore is displayed in the first line, and the rest in the second line. Without the [nohyphen] option, it even adds a hyphen. I need the underscore package, because otherwise LaTeX only allows _ in math mode.

How can I disable line-breaking and still use underscores in \texttt?

Answer 1

That's wanted. After the underscore, \usc@dischyph is inserted, which is, with the nohyphen option, \discretionary{}{}{} (it would be \- without the option).

You can change the meaning of \usc@dischyph, so no line break will be allowed after an underscore.

\documentclass{article}
\usepackage[nohyphen]{underscore}

\makeatletter
\def\usc@dischyph{}
\makeatother

\begin{document}

Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam 
diam \texttt{_nonumynonumy} eirmod tempor invidunt ut labore et 
dolore magna aliquyam erat, sed diam voluptua.

\end{document}