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

PATH="$PATH:.:./dist-tools"; export PATH

tmp=/tmp/fetchmail-growthplot.$$
mkdir $tmp

# 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$$

# gnuplot line styles.  These occasionally change (like beteween 3.5 and 3.7);
# use "echo 'set terminal png; test' | gnuplot | display -" to check.
blue_boxes=3
green_crosses=2
cyan_diamonds=37	# Once purple triangles, but we can't do that anymore
brown_triangles=23

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

EOF

# OK, now write the event labels
(
	count=0
	lastday=0
        breakheight=510
	while read version legend
	do
		if [ "$version" = '%' ]
		then
			echo "# Associate $lastday to '$legend'"
			count=$((count+1))
		        lastday=$(($lastday-5))
			endy=$((breakheight+50+count*50))
			if ((endy>lasttotal))
			then
			    # Label over curve hanging right, arrow down
			    arrowhead=$((lasttotal+50))
			    echo "set label '$legend' at $lastday-10, $endy+15"
			else
			    # Label under curve hanging left, arrow up
			    arrowhead=$((lasttotal-5))
			    strlen=`python -c "print len('$legend')"`
			    lablen=$((strlen*22))
			    echo "set label '$legend' at $lastday-$lablen+10, $endy-15"
			fi
			echo set arrow \
				from $lastday, $endy \
				to $lastday, $arrowhead \
				head
		else
			set -- $legend
			size=$1 
			friends=$2
			announce=$3
			total=$4
			days=$5 
			date=$6
			lastday=$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 $blue_boxes, \
     '$tmp/growthannounce$$' using 6:4 \
		title "fetchmail-announce" with points $cyan_diamonds, \
     '$tmp/growthannounce$$' using 6:3 \
		title "fetchmail-friends" with points $green_crosses, \
     '$tmp/growthnumbers$$' using 6:2 axes x1y2 \
		title "Lines of code" with points $brown_triangles
EOF

gnuplot $tmp/growthimage$$ >growth.png

rm -f $tmp/growth*
rmdir $tmp

# growthplot ends here