#! /bin/sh

ROA_IN=${1:-~/.roaming}
ROA_OUT=${2:-~}
ROA_BK="$ROA_OUT/.roaming-bk"

echo "Link roaming space $ROA_IN to $ROA_OUT. Are you sure? <y,n>"
read REPLYST
if [ ! "x$REPLYST" = "xy" ]
then
    exit 1
fi

#Treat all files, inclugind hidden file, but excluding the current script.
for FILE in $(ls -A $ROA_IN | grep -v -e "^$0$" )
do
  #echo $ROA_IN/$FILE
  
  #Skip existing correct links
  if [ -h $ROA_OUT/$FILE ]
  then
     if [ "x$( readlink '$ROA_OUT/$FILE')" = "x$( readlink -f '$ROA_IN/$FILE')" ]
     then
       continue
     fi
  fi

  # Move existing files to backup
  if [ -e $ROA_OUT/$FILE ]
  then
    # Create backup folder
    if [ ! -d $ROA_BK ]
    then
      if [ -e $ROA_BK ]
      then
        echo "[ERROR] $ROA_BK exists but is not a folder. Please fix this."
	exit 2
      fi
      mkdir -p $ROA_BK
    fi
    # If destination exists, ask if the user want to remove it
    if [ -e $ROA_BK/$FILE ]
    then
       echo "[?] Backup already exists in $ROA_BK/$FILE; replace it? [y,n]" 
       read REPLYBK
       if [ "x$REPLYBK" = "xy" ]
       then
         echo "Removing $ROA_BK/$FILE"
         rm -Rf "$ROA_BK/$FILE"
       else
         echo "[ERROR] Cannot backup existing file $ROA_BK/$FILE. Please fix this."
	 exit 3
       fi
    fi
    # Move file
    echo "Backuping $ROA_OUT/$FILE to $ROA_BK/$FILE"
    mv "$ROA_OUT/$FILE" "$ROA_BK/$FILE"
  fi
  
  # Link roaming file
  echo "Link $ROA_IN/$FILE to $ROA_OUT/$FILE"
  ln -s "$ROA_IN/$FILE" "$ROA_OUT/$FILE"
  
done