Implement to cd for Nix injected command

pkgs/posix_shared_functions/default.nix

@@ -34,6 +34,16 @@ pkgs.writeText "posix_shared_functions.sh" ''
     cd "$(${pkgs.coreutils}/bin/mktemp --directory)"
   }
 
+  cdn() {
+    if [ $# -lt 1 ]; then
+      echo "Specify Nix injected command you want to dive"
+      return 2
+    fi
+    # TODO: Check exit code and Nix or not
+    local -r command="$(command -v "$1")"
+    cd "$(dirname "$(dirname "$(readlink "$command")")")"
+  }
+
   gch() {
     fc -nrl 1 | ${lib.getExe fzf-bind-posix-shell-history-to-git-commit-message}
   }