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#!/bin/bash
SCR_WIDTH=1980
SCR_HEIGHT=1080
PADDING=50
FONT_SIZE=20
let "SCR_WIDTH -= 2 * $PADDING"
let "SCR_WIDTH /= 2"
let "SCR_HEIGHT -= 2 * $PADDING"
NR=$RANDOM
let "NR %= 524"
wget -qO- "http://pgfplots.sourceforge.net/example_$NR.pdf" | convert -size "x$SCR_HEIGHT" -density 300 - /tmp/bg.png
wget -qO- "http://pgfplots.sourceforge.net/gallery.html" | sed -n "/example_$NR\.pdf/,/<\/div>/p" | tail -n +6 | head -n -1 | pygmentize -l latex -O font_size=$FONT_SIZE -o /tmp/bg-src.png
montage -geometry "+$PADDING+$PADDING" /tmp/bg-src.png /tmp/bg.png "/tmp/bg-$NR.png"
rm /tmp/bg{,-src}.png
feh -B white --bg-max "/tmp/bg-$NR.png"
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