fix fdr function for relative and non-existent paths

Examples.md

@@ -67,16 +67,15 @@ fda() {
 fdr() {
   local declare dirs=()
   get_parent_dirs() {
-    dirs+=("$1")
-    if [[ ${1} == '/' ]]; then
-      for _dir in ${dirs[@]}; do
-        echo $_dir
-      done
+    if [[ -d "${1}" ]]; then dirs+=("$1"); else return; fi
+    if [[ "${1}" == '/' ]]; then
+      for _dir in "${dirs[@]}"; do echo $_dir; done
     else
-      get_parent_dirs $(dirname $1)
+      get_parent_dirs $(dirname "$1")
     fi
   }
-  DIR=$(get_parent_dirs ${1:-$(pwd)} | fzf-tmux --tac) && cd "$DIR"
+  local DIR=$(get_parent_dirs $(realpath "${1:-$(pwd)}") | fzf-tmux --tac)
+  cd "$DIR"
 }
 ```