#!/bin/bash
# This script leaves one of duplicated files unchanged and changes the other duplicated files to symbolic links to the left file.
# The modified time of the generated symbolic link is adjusted to the round-up minutes of the modified time of its original file (not the left file).
# The name of the generated symbolic link is that of its originial file (not the left file).
# Written by Kiyoshi SUZUKI ("kiyop" in Debian forum and Ubuntu forum and Ubuntu Japanese Team Forum) 

scroll () {
 a=0
 while [ $a -lt $1 ];do
  echo
  a=$(expr $a + 1)
 done
}

width=$(dialog --print-maxsize 2>&1|head -n1|cut -d " " -f3)
height=$(dialog --print-maxsize 2>&1|head -n1|cut -d " " -f2|tr -d ,)
if [ -e fdupes2.log ];then
 scroll $height
 dialog --msgbox "This script will delete fdupes2.log. Please use this script on the directory which does not contain fdupes2.log" $height $width
 exit 1
fi
if [ -e fdupes2.log2 ];then
 scroll $height
 dialog --msgbox "This script will delete fdupes2.log. Please use this script on the directory which does not contain fdupes2.log2" $height $width
 exit 1
fi
if [ -n "$(pwd|grep ' ')" ];then
 scroll $height
 dialog --msgbox "This script cannot work correctly on a directory the name of which involves space." $height $width
 exit 1
fi

makelink () {
# $1 must not be a directory, but must be a file.
# $2 must not be a directory, but must be a file.
# $1 is the path (name) of a destination file of the symbolic link to be generated.
# $currentdir is the full path of the current directory.
# $2 is the path (name) of the symbolic link to be generated.
 savedir=$(echo $2|sed -e "s@[^/]*\$@@")
 if [ -z "$savedir" ];then savedir="$currentdir";fi
 savedir=$(readlink -e "$savedir")
 if [ -n "$(echo "$savedir"|tr "/" '\n'|tail -n1)" ];then
  savedir="${savedir}/"
 fi
 cd "$savedir"
 savedir1=$savedir
 savedir1=$(echo $savedir1|cut -c2-)
 link=$(echo "${currentdir}/${1}")
 link=$(readlink -e "$link"|cut -c2-)
 until [ a"$(echo $link|grep \/)" = "a" -o a"${savedir1}" = "a" ];do
  if [ a"$(echo $link|sed -e 's@/@\n@'|head -n 1)" = a"$(echo $savedir1|sed -e 's@/@\n@'|head -n 1)" ];then
   num=$(expr $(echo $link|sed -e "s@/@\n@"|head -n 1|wc -c) + 1)
   link=$(echo $link|cut -c${num}-)
   savedir1=$(echo $savedir1|cut -c${num}-)
  else
   break
  fi
 done
 if [ a"$savedir1" = "a" ];then
  num=0
 else
  num=$(echo $savedir1|sed -e "s@/@\n@g"|wc -l)
 fi
 while [ $num -gt 1 ];do
  link="../$link"
  num=$(expr $num - 1)
 done
 echo "link is tried to be made for $link with the name $(basename $2) in $savedir" >> $logfilename
 linkname=$(basename "$2")
 ln -s "$link" "$linkname"
 if [ $? = 1 ];then
  scroll $height
  dialog --title "" --msgbox "${savedir}/${linkname} cannot be made.\nMaybe there is not write permission of ${savedir}.\nPlease select a directory with write permission.\nThe link is not generated." $height $width
  echo "${savedir}/${linkname} cannot be made.\nMaybe there is not write permission of ${savedir}.\nPlease select a directory with write permission.\nThe link is not generated." >> $logfilename
# Return to original directory after the above task finished.
  cd "$currentdir"
  exit 1
 else
  echo "The above is succeeded." >> $logfilename
 fi
 cd "$currentdir"
}

currentdir="$PWD"
echo $currentdir
logbegindate="$(date +%C%y%m%d%k%M|tr -d ' ')"
logfilename="$currentdir/fdupes.log_$logbegindate"
touch "$logfilename"
fdupes -rn . > fdupes2.log2
echo "The below is the result of \"fdupes -rn .\" at $(pwd) at $logbegindate
=====" >> $logfilename
cat fdupes2.log2 >> $logfilename
sed -e "s@^./@@" fdupes2.log2 > fdupes2.log
rm fdupes2.log2
logfilename="$currentdir/fdupes2.log_$logbegindate"
touch $logfilename
echo "The below is the log of fdupes2 at $(pwd) at $logbegindate
=====" >> $logfilename

while [ $(wc -l fdupes2.log|cut -d " " -f1) -gt 1 ];do
 dealtlines="$(sed -e "/^$/q" fdupes2.log|grep -v ^$)"
 if [ -z "$dealtlines" ];then
  mv fdupes2.log fdupes2.log2
  sed -e "1d" fdupes2.log2 > fdupes2.log
  rm fdupes2.log2
  continue
 fi
 echo "" >> $logfilename
 if [ -n "$(echo "$dealtlines"|grep ' ')" ];then
  scroll $height
  dialog --msgbox "This script cannot deal files with full path involving ' '. Skip
$dealtlines" $height $width
  echo "This script cannot deal files with full path involving ' '. The following files are skipped.
$dealtlines" >> $logfilename
  mv fdupes2.log fdupes2.log2
  num=$(echo "$dealtlines"|wc -l|cut -d " " -f1)
  num=$(expr $num + 1)
  sed -e 1,${num}d fdupes2.log2 > fdupes2.log
  rm fdupes2.log2
  continue
 fi
 strings=$(echo "$dealtlines"|sed -n -e = -e p)
 scroll $height
 selected=$(dialog --no-shadow --colors --stdout --menu "Select the file to keep. The others will be changed to symbolic links" $height $width 10 $strings)
 if [ $? = 1 ];then
  echo "The following files are skipped according to the request.
$dealtlines" >> $logfilename
  mv fdupes2.log fdupes2.log2
  num=$(echo "$dealtlines"|wc -l|cut -d " " -f1)
  num=$(expr $num + 1)
  sed -e 1,${num}d fdupes2.log2 > fdupes2.log
  rm fdupes2.log2
  continue
 fi
 originalfile=$(echo "$dealtlines"|sed -n -e ${selected}p)
 dealtlines=$(echo "$dealtlines"|grep -v ^$originalfile\$)
 for dealt in $dealtlines;do
  time=$(ls --full-time $dealt|cut -d " " -f 6-7|tr -d " "|tr -d :|tr -d -|sed -e "s/\..*//")
  time=$(echo $time|cut -c 1-12)
  filedata=$(ls -l $dealt)
  rm $dealt
  if [ $? = 1 ];then
   scroll $height
   dialog --title "" --msgbox "$dealt cannot be deleted.\nMaybe we do not have write permission of it.\nPlease select a directory with write permission.\nThe link is not generated." $height $width
   echo "$dealt cannot be deleted.\nMaybe we do not have write permission of it.\nPlease select a directory with write permission.\nThe link is not generated.
--" >> $logfilename
   continue
  else
   echo "The following file is deleted.
$filedata" >> $logfilename
  fi
  makelink "$originalfile" "$dealt"
  touch -c -h -t ${time}.60 $dealt
  if [ $? = 1 ];then
   echo "The modified time of $dealt is failed to be changed." >> $logfilename
  else
   echo "The modified time of $dealt is successfully changed to ${time}.60" >> $logfilename
  fi
# The minutes is round up so that the original file is overwritten by the generated symbolic link if "cp -au" is used to synchronize.
  echo "--" >> $logfilename
 done
 mv fdupes2.log fdupes2.log2
 num=$(echo "$dealtlines"|wc -l|cut -d " " -f1)
 num=$(expr $num + 1)
 sed -e 1,${num}d fdupes2.log2 > fdupes2.log
 rm fdupes2.log2
done

rm fdupes2.log
exit 0