\HeaderA{promptData}{Generate a Shell for Documentation of Data Sets}{promptData}
\keyword{documentation}{promptData}
\begin{Description}\relax
Generates a shell of documentation for a data set.
\end{Description}
\begin{Usage}
\begin{verbatim}
promptData(object, filename = NULL, name = NULL)
\end{verbatim}
\end{Usage}
\begin{Arguments}
\begin{ldescription}
\item[\code{object}] an \R{} object to be documented as a data set.
\item[\code{filename}] usually, a connection or a character string giving the
name of the file to which the documentation shell should be written.
The default corresponds to a file whose name is \code{name} followed
by \code{".Rd"}.  Can also be \code{NA} (see below).
\item[\code{name}] a character string specifying the name of the object.
\end{ldescription}
\end{Arguments}
\begin{Details}\relax
Unless \code{filename} is \code{NA}, a documentation shell for
\code{object} is written to the file specified by \code{filename}, and
a message about this is given.

If \code{filename} is \code{NA}, a list-style representation of the
documentation shell is created and returned.  Writing the shell to a
file amounts to \code{cat(unlist(x), file = filename, sep = "\bsl{}n")},
where \code{x} is the list-style representation.

Currently, only data frames are handled explicitly by the code.
\end{Details}
\begin{Value}
If \code{filename} is \code{NA}, a list-style representation of the
documentation shell.  Otherwise, the name of the file written to is
returned invisibly.
\end{Value}
\begin{Section}{Warning}
This function is still experimental.  Both interface and value might
change in future versions.  In particular, it may be preferable to use
a character string naming the data set and optionally a specification
of where to look for it instead of using \code{object}/\code{name} as
we currently do.  This would be different from \code{\LinkA{prompt}{prompt}},
but consistent with other prompt-style functions in package
\pkg{methods}, and also allow prompting for data set documentation
without explicitly having to load the data set.
\end{Section}
\begin{SeeAlso}\relax
\code{\LinkA{prompt}{prompt}}
\end{SeeAlso}
\begin{Examples}
\begin{ExampleCode}
promptData(sunspots)
unlink("sunspots.Rd")
\end{ExampleCode}
\end{Examples}