#!/bin/sh

dir=/home/dpavlin/zc/gnuplot/

echo "Content-type: image/svg+xml"
echo

pn=$( basename $0 | sed 's/.cgi//' )
offset=$( grep "^$pn" $dir/offset.txt )
offset_x=$( echo $offset | cut -d' ' -f2 )
offset_y=$( echo $offset | cut -d' ' -f3 )
test -z "$offset_x" && offset_x=0
test -z "$offset_y" && offset_y=0

test -z "$QUERY_STRING" && QUERY_STRING='.'
gnuplot_sed='';

yrange=$( echo $QUERY_STRING | grep '^yrange=[0-9]*\.[0-9]*$' | cut -d= -f2 )
test -z "$yrange" && yrange=0.2

voltage=0
echo $HTTP_REFERER | grep -q voltage && voltage=1
echo $QUERY_STRING | grep -q voltage && voltage=1

set > /dev/shm/$pn.env

cat $dir/template.sql | sed -e "s/2008050087/$pn/" -e "s/x_axis_angle/x_axis_angle + $offset_x/" -e "s/y_axis_angle/y_axis_angle + $offset_y/" | psql --username=dpavlin -A -F "," -t zc > /dev/shm/$pn.txt
if [ -s /dev/shm/$pn.txt ] ; then
cat $dir/template.gnuplot | sed -e "s,axes.txt,/dev/shm/$pn.txt," -e "s,^set terminal.*$,set terminal svg," -e "s,^set output.*$,set output," -e "s,-0.3 : 0.3,-$yrange : $yrange," > /dev/shm/$pn.gnuplot
gnuplot -e "voltage=$voltage" /dev/shm/$pn.gnuplot
else
cat << __SVG__
<?xml version="1.0" encoding="utf-8"  standalone="no"?>
<svg 
 width="600" height="1"
 viewBox="0 0 600 480"
 xmlns="http://www.w3.org/2000/svg"
 xmlns:xlink="http://www.w3.org/1999/xlink"
>
</svg>
__SVG__
fi

#rm /dev/shm/axes.txt.$$ /dev/shm/axes.gnuplot.$$