# HG changeset patch
# User Franz Glasner <fzglas.hg@dom66.de>
# Date 1641135935 -3600
# Node ID 4c968c5cfce6c68aedf9e733281c95729d696051
# Parent  79db28e879f8b700f7f528438de9b0879689be1b
Try to interpolate only if the length of the source string exceeds a minimum length

diff -r 79db28e879f8 -r 4c968c5cfce6 configmix/config.py
--- a/configmix/config.py	Sun Jan 02 02:04:07 2022 +0100
+++ b/configmix/config.py	Sun Jan 02 16:05:35 2022 +0100
@@ -869,6 +869,9 @@
 
     def interpolate_variables(self, s):
         """Expand all variables in the single string `s`"""
+        len_s = len(s)
+        if len_s < 4:
+            return s
         start = s.find(_STARTTOK, 0)
         if start < 0:
             return s
@@ -883,7 +886,6 @@
                                "%r (cached)" % (s, ))
             else:
                 return res
-        len_s = len(s)
         res = []
         res_append = res.append
         rest = 0