#!/bin/ksh
#set -x
opt=$1
if [ "${opt#-}" != "$opt" ]; then
	shift 1
else
	opt=
fi

dir1=$1
if [ "${dir1#/}" = "$dir1" ]; then
	# relative path
	dir1=$PWD/$dir1
fi
	
dir2=$2
if [ "${dir2#/}" = "$dir2" ]; then
	# relative path
	dir2=$PWD/$dir2
fi
	
interactive=1
tempres=/tmp/tempres.$$
if [ ! -d $dir1 ]; then
	echo "$dir1 not a directory"
	exit 1
fi
if [ ! -d $dir2 ]; then
	echo "$dir1 not a directory"
	exit 1
fi

cd $dir1
let i=0
for line in `find * -type f -print |\
	egrep 'akefile|\.(pc|c|h|y|l|sql|cpp|inc|hpp)$' |\
	egrep -v '/\.[a-zA-Z]' |\
	egrep -v 'tags|ID'`
do
	diff $opt $line $dir2/$line > $tempres
	if [ $? = 0 ]; then
		result[i]="identical"
	else
		if [ ! -f $line ]; then
			result[i]="invalid, $dir1/$line missing"
		elif [ ! -f $dir2/$line ]; then
			result[i]="invalid, $dir2/$line missing"
		else
			line_diff=`sed -n '2,$p' $tempres | egrep -v 'SCCS_LONGVERSION|SCCS_VERSION|---' | wc -l`
			result[i]="different with $line_diff lines different"
		fi
	fi
	
	fname[i]=$line
	
	let i=i+1
done
rm -f $tempres
let j=0
while (( j < i )); do
	echo "${fname[j]} is ${result[j]}"
	let j=j+1
done

echo "Would you like to see the differences?(y|Y)"
read resp
if [ "$resp" = "Y" ] || [ "$resp" = "y" ]; then
	let j=0
	while (( j < i )); do
		if [ "${result[j]}" != "identical" ] &&
		   [ "${result[j]%missing}" = "${result[j]}" ]; then
			echo "${fname[j]}"
			diff $opt ${fname[j]} $dir2/${fname[j]}
			echo ""
			echo ""
			if [ "$interactive" = "1" ]; then
				echo "next file?"
				read
			fi
		fi
		let j=j+1
	done
else
	let j=0
	while (( j < i )); do
		if ([ "${result[j]}" != "different with 0 lines different" ] || 
		[ "${result[j]}" != "identical" ]) &&
		   [ "${result[j]%missing}" = "${result[j]}" ]; then
			echo "diff $opt $dir1/${fname[j]} $dir2/${fname[j]}"
		fi
		let j=j+1
	done
fi