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+\ProvidesPackage{overlays}[2016/09/30 v2.0 Incremental slides]
+
+% Copyright (C) 2016 Andreas Nolda
+
+% Author: Andreas Nolda <andreas@nolda.org>
+% Version: 2.0
+
+% This work may be distributed and/or modified under the conditions of the LaTeX
+% Project Public License, either version 1.3 of this license or (at your option)
+% any later version. The latest version of this license is in
+% http://www.latex-project.org/lppl.txt and version 1.3 or later is part of all
+% distributions of LaTeX version 2005/12/01 or later.
+
+% The following code is inspired by Matthias Meister's "present" package. It
+% uses an algorithm by Martin Scharrer for testing numbers in numerical ranges
+% (http://tex.stackexchange.com/q/19000/). The code for processing overlays with
+% verbatim content is taken from the "texpower" package, which in turn took it
+% from Till Tantau's "beamer" package.
+
+\RequirePackage{color}
+\RequirePackage{environ}
+\RequirePackage{pgffor}
+
+\definecolor{background}{rgb}{1,1,1}
+\definecolor{alert}{rgb}{1,0,0}
+
+\newcount\curoverl@y
+\newcount\maxoverl@y
+\newcount\overl@yspeca
+\newcount\overl@yspecb
+\newcount\saveequ@tion
+
+\def\@getoverl@yspecb-#1\relax%
+ {\ifx\relax#1\relax
+ \overl@yspecb=\maxoverl@y
+ \else
+ \overl@yspecb=#1\relax
+ \fi}
+
+\def\getoverl@yspecb%
+ {\@ifnextchar\relax
+ {\overl@yspecb=\overl@yspeca}%
+ {\@getoverl@yspecb}}
+
+\def\ifinoverl@yspec#1#2%
+ {\global\let\inoverl@yspec\@secondoftwo
+ \foreach \i in {#2}
+ {\afterassignment\getoverl@yspecb
+ \overl@yspeca=0\i\relax
+ \pgfmathtruncatemacro\result{(#1>=\overl@yspeca) && (#1<=\overl@yspecb)}%
+ \ifnum\result=1\relax
+ \breakforeach
+ \global\let\inoverl@yspec\@firstoftwo
+ \fi}%
+ \inoverl@yspec}
+
+\long\def\overl@y#1#2#3{\ifinoverl@yspec{\curoverl@y}{#1}{#2}{#3}}
+
+\NewEnviron{overlays}[1]%
+ {\maxoverl@y=#1%
+ \curoverl@y=0%
+ \saveequ@tion=\value{equation}%
+ \loop
+ \advance\curoverl@y by 1%
+ \begingroup
+ \BODY
+ \endgroup
+ \ifnum\curoverl@y<\maxoverl@y%
+ \vfill
+ \clearpage
+ \addtocounter{page}{-1}%
+ \setcounter{equation}{\saveequ@tion}%
+ \repeat}
+
+\newwrite\verb@timfileout
+
+\def\verb@timreadslide
+ {\begingroup%
+ \let\do\@makeother\dospecials%
+ \count@=127%
+ \@whilenum\count@<255 \do
+ {\advance\count@ by 1%
+ \catcode\count@=11}
+ \@makeother\^^L
+ \endlinechar`\^^M \catcode`\^^M=12 \processslidefirstline}
+
+{\catcode`\^^M=12\endlinechar=-1%
+ \long\gdef\processslidefirstline#1^^M%
+ {\def\overl@ystest{#1}%
+ \ifx\overl@ystest\stopslidefirst%
+ \let\next=\endfr@gileoverl@ys%
+ \else
+ \ifx\overl@ystest\@empty%
+ \else%
+ \@temptokena={#1}%
+ \immediate\write\verb@timfileout{\the\@temptokena}%
+ \fi%
+ \let\next=\processslideline%
+ \fi%
+ \next}
+ \long\gdef\processslideline#1^^M%
+ {\def\overl@ystest{#1}%
+ \ifx\overl@ystest\stopslide%
+ \let\next=\endfr@gileoverl@ys%
+ \else
+ \immediate\write\verb@timfileout{#1}%
+ \fi%
+ \next}}
+
+{\escapechar=-1\relax%
+ \xdef\stopslide{\string\\end\string\{fragileoverlays\string\}}
+ \xdef\stopslidefirst{\noexpand\end\string\{fragileoverlays\string\}}}
+
+\newenvironment{fragileoverlays}[1]
+ {\maxoverl@y=#1%
+ \def\verb@timfilen@me{\jobname.vrb}%
+ \immediate\openout\verb@timfileout=\verb@timfilen@me%
+ \verb@timreadslide}
+ {\immediate\closeout\verb@timfileout%
+ \begin{overlays}{\maxoverl@y}
+ \def\verbatim@nolig@list{\do\`\do\<\do\>\do\'} % do not make "," and "-" active
+ \input{\verb@timfilen@me}%
+ \end{overlays}}
+
+\def\endfr@gileoverl@ys{\endgroup\end{fragileoverlays}}
+
+\newcommand{\only}[2]{\overl@y{#1}{#2}{\relax}}
+
+\newcommand{\visible}[2]{\overl@y{#1}{#2}{{\color{background}#2\ifvmode\unskip\fi}}}
+
+\newcommand{\alert}[2]{\overl@y{#1}{{\color{alert}#2\ifvmode\unskip\fi}}{#2}}