# non-commercial use provided that this notice appears in
# all copies of the file.  There is no warranty, either
# expressed or implied, supplied with this code.
#
# NAME
#    DirCmp - compare the files in two directories
#
# SYNOPSIS
#    DirCmp [-v] [dir1] dir2
#
# DESCRIPTION
#    This command compares the files in two directories and
#    lists the files that are not the same.  There will be
#    three separate lists for: 
#
#    1. Files not in the first directory, but in the second
#    2. Files not in the second directory, but in the first
#    3. Files in both directories, but not the same
#
#    -v   Verbose option.  This option prints the lines that
#         are different rather than just the name of the
#         file when the file is in both directories, but the
#         files are not the same.
#
# RETURN VALUE
#    0    The directories are the same
#    1    Usage error or abnormal termination
#    2    The directories are not the same
#
############################################################
CMDNAME=`basename $0`
USAGE="Usage: $CMDNAME [-v] [dir1] dir2"

CURDIR=`pwd`                  # Current directory
DIR1=                         # Source directory
DIR2=                         # Target directory
DIR1_FILES=/tmp/files1.$$     # Files in dir1
DIR2_FILES=/tmp/files2.$$     # Files in dir2
ALL_FILES=/tmp/allfiles.$$    # Files in dir1 or dir2
COMMON_FILES=/tmp/comfiles.$$ # Files in dir1 and dir2
TMP=/tmp/tmp.$$               # Temporary file
FOUND=FALSE                   # Differences found?
FIRST=
VERBOSE=FALSE

trap 'rm -f /tmp/*.$$; exit 1' 1 2 3 15

#
# Parse the command options.
#
while :
do

#
# Get command line arguments.
#
if [ $# -eq 1 ]; then
     DIR1="."
     DIR2="$1"
elif [ $# -eq 2 ]; then
     DIR1="$1"
     DIR2="$2"
else
     echo "$USAGE" 1>&2
     exit 1
fi

#
# Check the directories.
#
if [ ! -d $DIR1 ]; then
     echo "$DIR1 is not a directory." 1>&2
     exit2
fi

if [ ! -d $DIR2 ]; then
     echo "$DIR2 is not a directory." 1>&2
     exit2
fi

#
# Find the files to compare.
#
cd $DIR1
find . \( -type f -o -type l \) -print | sort >$DIR1_FILES
cd $CURDIR

cd $DIR2
find . \( -type f -o -type l \) -print | sort >$DIR2_FILES
cd $CURDIR

#
# Build a list of all files.
#
cat $DIR1_FILES $DIR2_FILES | sort | uniq    >$ALL_FILES
cat $DIR1_FILES $DIR2_FILES | sort | uniq -d >$COMMON_FILES

#
# Print the files that are in dir2, but not in dir1.
#
cat $DIR1_FILES $ALL_FILES | sort | uniq -u >$TMP
if [ -s $TMP ]; then
     FOUND=TRUE
     echo ""
     echo ""
     echo "Files missing from $DIR2:"
     for f in `cat $TMP`
     do
          f=`expr $f : '..\(.*\)'`
          echo "    $f"
     done
fi

#
# Print the files that are in dir1 and dir2, but are not
# the same.
#
FIRST=TRUE
for f in `cat $COMMON_FILES`
do
     cmp -s $DIR1/$f $DIR2/$f
     if [ $? -ne 0 ]; then
          FOUND=TRUE
          f=`expr $f : '..\(.*\)'`
          if [ "$FIRST" = "TRUE" ]; then
               FIRST=FALSE
               echo ""
               echo "Files that are not the same:"
          fi

          if [ "$VERBOSE" = "TRUE" ]; then
               echo ""
               echo "File: $f"
               diff $DIR1/$f $DIR2/$f
          else
               echo "   $f"
          fi
     fi
done

rm -f /tmp/*.$$
if [ $FOUND = TRUE ]; then
     exit 2
else
     echo "The directories are the same."
     exit 0
fi