#!/bin/sh

# DiffDirs.sh
# 2006-06-16
# Chieh Cheng
# http://www.CynosureX.com/

# GNU General Public License (GPL), Version 2, June 1991

scriptname=`echo $0 | sed s/\\\\/.*\\\\///g`

if [ $# -ne 3 ]
then
  echo "  Usage:   $scriptname \"dir1\" \"dir2\" recurse?"
  echo
  echo "           recurse? - Recurse into sub-directories."
  echo "                      Yes or no response."
  echo "                      \"yes\" or \"y\" evaluates to true."
  exit
fi

dir1="$1"
dir2="$2"
recurse="$3"

sleep 1
tag=`date`
compareSet="DiffDirs_Compare_${tag}"
processedSet="DiffDirs_Processed"

diffFiles ()
{
  d1="$1"
  d2="$2"

  exec < `Set_GetFileName.sh "${compareSet}"`

  while read file
  do
    if [ -d "${d1}/${file}" -a -d "${d2}/${file}" ]
    then
      if [ "${recurse}" == "yes" -o "${recurse}" == "y" ]
      then
        "${scriptname}" "${d1}/${file}" "${d2}/${file}" "${recurse}"
      else
        echo "${d1}/${file} and ${d2}/${file} are directories."
      fi
    else
      if [ -d "${d1}/${file}" -o -d "${d2}/${file}" ]
      then
        echo "${d1}/${file} and ${d2}/${file} do not match."
      else
        result=`Set_Has.sh "${processedSet}" "${d1}/${file}"`
        if [ "${result}" == "false" ]
        then
          diff -q "${d1}/${file}" "${d2}/${file}"
          Set_Add.sh "${processedSet}" "${d1}/${file}"
          Set_Add.sh "${processedSet}" "${d2}/${file}"
        fi
      fi
    fi
  done
}

makeCompareSet ()
{
  tempSet="DiffDirs_Temp"
  d1="$1"
  d2="$2"
  cwd=`pwd`

  Set_New.sh "${tempSet}"

  cd "${d1}"

  for file in *
  do
    if [ "${file}" != "*" ]
    then
      Set_Add.sh "${tempSet}" "${file}"
    fi
  done

  cd "${cwd}"
  cd "${d2}"
  
  for file in *
  do
    if [ "${file}" != "*" ]
    then
      Set_Add.sh "${tempSet}" "${file}"
    fi
  done

  cd "${cwd}"

  Set_Unique.sh "${tempSet}" "${compareSet}"
  Set_Delete.sh "${tempSet}"
}

result=`Set_Exists.sh "${processedSet}"`
if [ "${result}" = "true" ]
then
  parent="false"
else
  parent="true"
  Set_New.sh "${processedSet}"
fi

if [ -d "${dir1}" -a -d "${dir2}" ]
then
  Set_New.sh "${compareSet}"
  makeCompareSet "${dir1}" "${dir2}"
  diffFiles "${dir1}" "${dir2}"
  Set_Delete.sh "${compareSet}"
else
  echo "${dir1} and/or ${dir2} are not directories!"
fi

if [ "${parent}" = "true" ]
then
  Set_Delete.sh "${processedSet}"
fi