#!/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"

# Test internet
timeout 4 wget -q --spider http://cloogle.org || setbg-backup || exit 1

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"