add safe-rm plugin to prevent mistaken delete

plugins/safe-rm/safe-rm.plugin.zsh

@@ -0,0 +1,50 @@
+function _realdir () {
+
+  TARGET_FILE=$1
+
+  cd `dirname $TARGET_FILE`
+  TARGET_FILE=`basename $TARGET_FILE`
+
+  # Iterate down a (possible) chain of symlinks
+  while [ -L "$TARGET_FILE" ]
+  do
+      TARGET_FILE=`readlink $TARGET_FILE`
+      cd `dirname $TARGET_FILE`
+      TARGET_FILE=`basename $TARGET_FILE`
+  done
+
+  # Compute the canonicalized name by finding the physical path
+  # for the directory we're in and appending the target file.
+  PHYS_DIR=`pwd -P`
+  RESULT=$PHYS_DIR # get asolute dir
+  # RESULT=$PHYS_DIR/$TARGET_FILE #get absolute path
+  echo $RESULT
+}
+
+function rm () {
+  local files
+  local trash=~/.Trash/
+  test ! -d $trash && mkdir $trash
+  for files in "$@"; do
+    # ignore any arguments
+    if [[ "$files" = -* ]]; then :
+    else
+      local dst=${files##*/}
+      local filePath
+      
+      # append the time if necessary
+      while [ -e $trash$dst ]; do
+        dst=$dst_$(date +%H-%M-%S)
+      done
+
+      # if the file is in dustbin or is dustbin itself ,remove it permanently
+      filePath=`_realdir $files`
+      if test $trash -ef $filePath -o $trash -ef $files
+      then
+        \env rm -r $files
+      else
+        \env mv $files $trash$dst
+      fi
+    fi
+  done
+}