Getting \rule to automatically break across lines

Question

I am currently using \rule to insert blank lines into paragraphs of text in a document though the lines often go past the document margins. I know I can use \hrulefill to stay within the margins, but often I do not want the line to stretch across the entire page. Does anybody know a way to either have \rule break between lines or display wholly on the next line if it does not fit within the margins?

For example:

If I have:

Lorem ipsum dolor sit amet, \rule{6em}{.5pt} consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea \rule{6em}{.5pt} commodo consequat. Duis aute irure dolor in reprehenderit in \rule{6em}{.5pt} voluptate velit esse cillum dolore eu fugiat nulla \rule{6em}{.5pt} pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum

How can I ensure that the \rules do not cross into my document margins?

Answer 1

To amend the short comment of cgnieder:

\documentclass{article}
\usepackage{exsheets}

\begin{document}
Some people are really modest. Guess who wrote the exsheets package:
The nick of the author is \blank[width=4cm]{cgnieder}, and his full
name is \blank[width=7cm]{Clemens Niederberger}.

\end{document}