Add cache on executables-in

news/cache-executables-in.rst

@@ -0,0 +1,23 @@
+**Added:**
+
+* Added cache on finding executable files, to speedup command-not-found suggestions
+
+**Changed:**
+
+* <news item>
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* <news item>
+
+**Fixed:**
+
+* <news item>
+
+**Security:**
+
+* <news item>

xonsh/tools.py

@@ -802,6 +802,7 @@ def _executables_in_windows(path):
         return
 
 
+# @functools.lru_cache(128)
 def executables_in(path):
     """Returns a generator of files in path that the user could execute. """
     if ON_WINDOWS: