make sure it works for jruby as well

Author: titusfortner

rb/.envrc

@@ -6,13 +6,13 @@ if command -v rbenv >/dev/null 2>&1; then
 
   RBENV_ROOT_DEFAULT="$(rbenv root 2>/dev/null || echo "$HOME/.rbenv")"
   RUBY_SYMLINK="${RBENV_ROOT_DEFAULT}/versions/${LABEL}"
-  RUBY_BIN="${RUBY_SYMLINK}/bin/ruby"
+  BIN_DIR="${RUBY_SYMLINK}/bin"
 
-  # Always track the binary, even if missing now
-  watch_file "${RUBY_BIN}"
+  # Always track the directory, even if missing now
+  watch_file "${BIN_DIR}"
 
-  # Only set environment variable if active
-  if [ -x "${RUBY_BIN}" ]; then
+  # Only set environment variable if directory currently present
+  if [ -d "${BIN_DIR}" ]; then
     export RBENV_VERSION="${LABEL}"
   fi
 fi