Labeled rule in LaTeX

labeled-rule.tex

% \labeledrule[width]{Top}{Bottom}
% 
% Useful for creating forms. The text above the rule is aligned to the
% surrounding baseline. A zero-width box contains the top label. The second
% command takes the bottom label and lowers it by \baselineskip, then packs it
% into a box with width zero, height of 1 em, and depth of \baselineskip plus
% the depth of the bottom label text. The height of the rule (0.4pt) is TeX's
% hard-coded height for \hrule.

\newcommand{\labeledrule}[3][\linewidth]{%
	\makebox[0pt][l]{#2}%
	\makebox[0pt][l]{\raisebox{-\baselineskip}[1em][\dimexpr\baselineskip+\depth\relax]{#3}}%
	\rule[-2pt]{#1}{0.4pt}%
}