#!/bin/bash

tmp=$(mktemp -d /tmp/pdfnup-slides-XXXXX)
[ -z "$tmp" ] && exit 1

# put 2x3 slides (pdf) on one page
#pdfnup --nup 2x3 --frame true \
#  --delta "0.5cm 3cm" --offset "0cm 1cm" \
#  --scale 0.85 \
#  "$@" \
#  --outfile "$tmp/1.pdf"

# put 2x2 slides (pdf) on one page
pdfnup --nup 2x2 --frame true \
  --delta "0.5cm 0.5cm" \
  --scale 0.9 \
  "$@" \
  --outfile "$tmp/1.pdf"

# scale up to a4 - now works for beamer slides, too.
# hackhackhack
cat > "$tmp/2.tex" <<EOF
\documentclass[a4paper,landscape]{article}
\usepackage{pdfpages}
\begin{document}
\includepdf[pages=-,nup=1x1,frame=false,trim=0 0 0 0,delta=0 0,offset=0 0,scale=1.0,turn=true,noautoscale=false,column=false,columnstrict=false,openright=false]{$tmp/1.pdf}
\end{document}
EOF
pdflatex -output-directory "$tmp" "$tmp/2.tex" 
mv -v "$tmp/2.pdf" "$1.2x2.pdf"

# cleanup
rm -f "$tmp"/*.pdf "$tmp"/*.tex "$tmp"/*.aux "$tmp"/*.log
rmdir "$tmp"