#!/bin/bash

gen_file()
{
	typeset field=$1
	for fs in $FS
	do
		cat ${DIR}/$fs
	done | awk 'BEGIN {count=0.5}/^'$field' /{ print count" "$2;count++; }'
}

get_fields()
{
	typeset dir=$1
	awk '{ print $1 }' $dir/*|sort -u
}

getbase()
{
	typeset file=$1
	awk 'BEGIN { base=-1 } { if (base == -1) base=$2; if ($2 < base) base = $2 } END { print base}' $file
}

gen_gnuplot()
{
	typeset -i count=0
	field=$1
	base=$2
	for fs in $FS
	do
		echo "set label \"$fs\" at first $count+0.5,$base left rotate by 90 front"
		let count=$count+1
	done
cat <<!EOF
set ylabel "Time in seconds"
set terminal png picsize 640 480
set boxwidth 0.80
set nokey
set noxtics
set grid ytics
set title '$field'
set output '$field.png'
plot '$field' with boxes fs solid 1
!EOF
}

DIR="$1"

if [ "$DIR" = "" ] || [ ! -d "$DIR" ]
then
	echo "Usage: $0 <directory>"
	exit 1
fi

FIELDS=$(get_fields $DIR)
FS=$(ls $DIR)

rm -fr ./gnuplot
mkdir gnuplot

for field in $FIELDS
do
	gen_file $field > gnuplot/$field
done

cd gnuplot
for field in $FIELDS
do
	base=$(getbase $field)
	echo "Generating ${field}.png"
	gen_gnuplot $field $base | gnuplot
done