# HG changeset patch
# User Jun Wu <quark@fb.com>
# Date 1463178081 -3600
# Node ID d6cec13b4bb00a39e2681715f6ba172aa0fa1902
# Parent  99bc6003ac56d7c37e6d424acffebe0c2e5ecbf0
svnmeta: add the "revmapexists" method

This is a part of the bigger plan to get rid of reading or writing rev_map
directly without going through the RevMap class.

The revset functions "fromsvn" and "svnrev" will read the rev_map file
directly, and throw an exception if the file does not exist. This makes
the check possible via svnmeta.

diff --git a/hgsubversion/svnmeta.py b/hgsubversion/svnmeta.py
--- a/hgsubversion/svnmeta.py
+++ b/hgsubversion/svnmeta.py
@@ -348,6 +348,10 @@ class SVNMeta(object):
             self._revmap = maps.RevMap(self)
         return self._revmap
 
+    @property
+    def revmapexists(self):
+        return maps.RevMap.exists(self)
+
     def fixdate(self, date):
         if date is not None:
             date = date.replace('T', ' ').replace('Z', '').split('.')[0]