# HG changeset patch
# User Yuya Nishihara <yuya@tcha.org>
# Date 1602681048 -32400
# Node ID edfc5820aae700b534189fcbbfb153bf74a20fcd
# Parent  d502caab76bcfc6fb522927d8efd2b175210cd6a
py3: fix stringmatcher() to byte-stringify exception message

Spotted while writing regexp variant of stringmatcher().

diff -r d502caab76bc -r edfc5820aae7 mercurial/utils/stringutil.py
--- a/mercurial/utils/stringutil.py	Mon Oct 05 20:53:34 2020 +0900
+++ b/mercurial/utils/stringutil.py	Wed Oct 14 22:10:48 2020 +0900
@@ -361,7 +361,9 @@
                 flags = remod.I
             regex = remod.compile(pattern, flags)
         except remod.error as e:
-            raise error.ParseError(_(b'invalid regular expression: %s') % e)
+            raise error.ParseError(
+                _(b'invalid regular expression: %s') % forcebytestr(e)
+            )
         return kind, pattern, regex.search
     elif kind == b'literal':
         if casesensitive:
diff -r d502caab76bc -r edfc5820aae7 tests/test-revset.t
--- a/tests/test-revset.t	Mon Oct 05 20:53:34 2020 +0900
+++ b/tests/test-revset.t	Wed Oct 14 22:10:48 2020 +0900
@@ -1448,6 +1448,9 @@
     (string '('))
   hg: parse error: invalid match pattern: (unbalanced parenthesis|missing \),.*) (re)
   [255]
+  $ log 'desc("re:(")'
+  hg: parse error: invalid regular expression: (unbalanced parenthesis|missing \),.*) (re)
+  [255]
   $ try 'grep("\bissue\d+")'
   (func
     (symbol 'grep')