#! /bin/sh
# Carlos Duarte, 021229/030825

# usage: dir-diff dir1 dir2

SEDCMD=""
while :; do 
	case $1 in
	-e)	SEDCMD="$SEDCMD;$2"; shift 2; continue ;; 
	-*)	echo "$1: unknown flag, usage: dir-diff [-e sedcmds] dir1 dir2"; exit ;;
	*)	break ;;
	esac
done
SEDCMD="$(echo "$SEDCMD" | sed 's/^;*//; s/;*$//')"
#echo "$SEDCMD"; exit

if test $# -ne 2; then
	echo "usage: dir-diff [-e sed-cmds] dir1 dir2"
	exit 1
fi

for dir 
do
	test -d "$dir" && continue
	echo "$dir does not exist."
	exit 1
done

if test "$RANDOM" = "$RANDOM"; then	
	echo '$RANDOM var must work for this script to run'
	exit 1
fi

temp=/tmp/dd.$$
d1=$temp.$RANDOM
while test -f $d1 || test -d $d1 ; do
	d1=$temp.$RANDOM
done
d2=$temp.$RANDOM
while test -f $d2 || test -d $d2 ; do
	d2=$temp.$RANDOM
done

# when dir diffing these /tmp/1 /usr/tmp/1, must strip heading path 
# from find output. eg: /tmp/1/a.txt  => a.txt ; /usr/tmp/1/dir/A => dir/A
#
x1=`echo "$1"|sed 's/\/*$//'`; n1=`expr length "$x1" + 2`
x2=`echo "$2"|sed 's/\/*$//'`; n2=`expr length "$x2" + 2`
if test "$SEDCMD" != ""; then 
	find "$x1" -print | cut -c$n1- | sed 's/\.\(gz\|bz2\)$//' | sed -e "$SEDCMD" | sort > $d1
else
	find "$x1" -print | cut -c$n1- | sed 's/\.\(gz\|bz2\)$//' | sort > $d1
fi
find "$x2" -print | cut -c$n2- | sed 's/\.\(gz\|bz2\)$//' | sort > $d2
diff $d1 $d2
rm $d1 $d2