#!/bin/sh
#
# growthplot -- plot the fetchmail project's growth as a function of time
#

# Get data from the NEWS file
timeseries >/tmp/growthplot$$
grep "^[0-9]" /tmp/growthplot$$ >/tmp/growthnumbers$$
grep "^[0-9.]*.[05].0	" /tmp/growthplot$$ >/tmp/growthmajors$$
sed '/^4.2.9/,$d' </tmp/growthnumbers$$ >/tmp/growthannounce$$

cat >/tmp/growthimage$$ <<EOF
set title "Fetchmail project growth history"
set xlabel 'Days since baseline'
set ylabel 'Participants'
set y2label 'Lines of code'
set ytics nomirror
set y2tics
set tics out
set autoscale y
set y2range [5000:50000]
set key bottom right box
set terminal png color

EOF

# OK, now write the event labels
(
	echo "count=0"
	echo "breakheight=510"
	while read version size friends announce total days date
	do
		if [ "$version" = '%' ]
		then
			legend="$size $friends $announce $total $days $date"
			echo "# Associate $lastday to '$legend'"
			echo "count = count + 1"
			echo "lastday = $lastday - 5"
			echo "lasttotal = $lasttotal"
			echo "endy = breakheight + 50 + count * 50"
			echo "if (endy > lasttotal) arrowhead = lasttotal+50"
			echo "if (endy <= lasttotal) arrowhead = lasttotal-5"
			echo set arrow \
				from lastday, endy \
				to lastday, arrowhead \
				head
			echo "if (endy > lasttotal) set label '$legend' at lastday-10, endy+15"
			echo "if (endy <= lasttotal) set label '$legend' at lastday-500, endy-15"
		else
			lastday=$days
			lasttotal=$total
		fi
	done
) </tmp/growthplot$$ >>/tmp/growthimage$$ 

# OK, now write the major-release labels
(
	while read version size friends announce total days date
	do
	    echo "set arrow from $days, $total - 55 to $days, $total - 15 head"
	    echo "set label '$version' at $days - 5, $total - 65"
	done
) </tmp/growthmajors$$ >>/tmp/growthimage$$ 

cat >>/tmp/growthimage$$ <<EOF
plot [] [0:] '/tmp/growthnumbers$$' using 6:5 \
		title "Both lists" with points 3, \
     '/tmp/growthannounce$$' using 6:4 \
		title "fetchmail-announce" with points 5, \
     '/tmp/growthannounce$$' using 6:3 \
		title "fetchmail-friends" with points 2, \
     '/tmp/growthnumbers$$' using 6:2 axes x1y2 \
		title "Lines of code" with points 7
EOF

gnuplot /tmp/growthimage$$ >growth.png

rm -f /tmp/growth*

# growthplot ends here