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% Bundled source file for the NEEDSPACE package
%--------1---------2---------3---------4---------5---------6
% Please see the accompanying README for author,
% license, documentation and installation information
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%%%%%%%%%%%%%%%%%%%%
%% PACKAGE SOURCE %%
%%%%%%%%%%%%%%%%%%%%

\RequirePackage{filecontents}
\begin{filecontents*}{needspace.sty}

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{needspace}[2010/09/12 v1.3d reserve vertical space]

\newcommand{\needspace}[1]{%
  \begingroup
    \setlength{\dimen@}{#1}%
    \vskip\z@\@plus\dimen@
    \penalty -100\vskip\z@\@plus -\dimen@
    \vskip\dimen@
    \penalty 9999%
    \vskip -\dimen@
    \vskip\z@skip % hide the previous |\vskip| from |\addvspace|
  \endgroup
}

\newcommand{\Needspace}{\@ifstar{\@sneedsp@}{\@needsp@}}

\newcommand{\@sneedsp@}[1]{\par \penalty-100\begingroup
  \setlength{\dimen@}{#1}%
  \dimen@ii\pagegoal \advance\dimen@ii-\pagetotal
  \ifdim \dimen@>\dimen@ii
    \break
  \fi\endgroup}

\newcommand{\@needsp@}[1]{\par \penalty-100\begingroup
  \setlength{\dimen@}{#1}%
  \dimen@ii\pagegoal \advance\dimen@ii-\pagetotal
  \ifdim \dimen@>\dimen@ii
    \ifdim \dimen@ii>\z@
      \vfil
    \fi
    \break
  \fi\endgroup}

\end{filecontents*}
%%%%%%%%%1%%%%%%%%%2%%%%%%%%%3%%%%%%%%%4%%%%%%%%%5


% Conditionally compile the documentation & generate the .ins file:
\providecommand\documentationCompile{Y}
\makeatletter
\if\documentationCompile N
  \expandafter\@@end
\fi


\begin{filecontents*}{needspace.ins}
%&latex
\def\documentationCompile{N}
\input needspace.tex
\csname@@end\endcsname
\end{filecontents*}


%%%%%%%%%%%%%%%%%%%
%% DOCUMENTATION %%
%%%%%%%%%%%%%%%%%%%

\documentclass{ltxdoc}
\usepackage[it,medium]{titlesec}
\usepackage[T1]{fontenc}
\usepackage{microtype}
\usepackage{lmodern}
\usepackage[sc,osf]{mathpazo}
\linespread{1.1}
\frenchspacing

\usepackage{fancyvrb}

\usepackage[svgnames]{xcolor}
\usepackage[colorlinks,linktocpage]{hyperref}
\DeclareRobustCommand\pkg{\textsf}

\usepackage{needspace}
\GetFileInfo{needspace.sty}

\begin{document}

\title{The \pkg{needspace} package}
\author{%
 Author: Peter Wilson, Herries Press\\
 Maintainer: Will Robertson\\
 \texttt{will dot robertson at latex-project dot org}%
}
\date{\fileversion \qquad \filedate}

\maketitle

\section{Documentation}

This packages two commands, \cs{needspace} and \cs{Needspace}, for reserving
space to keep a certain amount of material from being split over a page break.
If there is not enough space, a \verb|\newpage| is automatically inserted.

The \cs{needspace}\meta{length} macro reserves an \emph{approximate} amount of space \meta{length} for
the material following to be kept on the same page. The accuracy of its
calculations depend on what penalties are in effect, but is efficient and
normally adequate. A short page will be ragged bottom even if \cs{flushbottom}
is in effect.

\cs{Needspace}\marg{length} is less efficient but reserves the requested space \meta{length} exactly. It
should only be used between paragraphs. Short pages that are produced by
\cs{Needspace} will be ragged bottom but short pages produced by
\cs{Needspace*}\marg{length} will be flush bottom if \cs{flushbottom} is in
effect.

\section{Examples}

Here, we request that we need next five lines on a single page/column:
\begin{verbatim}
... previous text.

\needspace{5\baselineskip}
The next five lines ...
\end{verbatim}

\newpage
\noindent
In this case, the space is reserved more accurately:
\begin{verbatim}
... previous text.

\Needspace*{4\baselineskip}
   The major principles are:
\begin{itemize}
\item ...
\end{verbatim}


\section*{Licence and copyright}

This work may be modified and/or distributed under the terms and
conditions of the \LaTeX\ Project Public License\footnote{\url{http://www.latex-project.org/lppl.txt}}, version~1.3c or later (your choice).
The current maintainer of this work is Will Robertson.

\bigskip
  \noindent
  Copyright Peter Wilson, 1996--2003 \\
  Copyright Will Robertson, 2010, 2013

\clearpage
\parindent=0pt

\section{Implementation}
\VerbatimInput{needspace.sty}

\end{document}