Avoid calls to stat() in find_matches

Instead of stating every directory to check if its realpath is the
current directory, only do so for any potential matches.

bin/autojump

@@ -368,10 +368,6 @@ def find_matches(db, patterns, max_matches=1, ignore_case=False, fuzzy=False):
             return []
 
     for path, _ in dirs:
-        # avoid jumping to current directory
-        if current_dir == decode(os.path.realpath(path)) :
-            continue
-
         found, tmp = True, path
         for n, p in enumerate(patterns):
             # for single/last pattern, only check end of path
@@ -382,6 +378,11 @@ def find_matches(db, patterns, max_matches=1, ignore_case=False, fuzzy=False):
             if not found: break
 
         if found and (os.path.exists(path) or TESTING):
+            # avoid jumping to current directory
+            # (call out to realpath this late to not stat all dirs)
+            if current_dir == decode(os.path.realpath(path)) :
+                continue
+
             if path not in results:
                 results.append(path)
             if len(results) >= max_matches: