# HG changeset patch
# User Denis Laxalde <denis@laxalde.org>
# Date 2017-04-15 09:26:09
# Node ID 11f501f0a2136126aa4280c29929a246825d5424
# Parent  e6e1884df298da74c2a3ce77ae88483b94ad42d4

revsetlang: add a getboolean helper function

This will be used to parse followlines's "descend" argument.

diff --git a/mercurial/revsetlang.py b/mercurial/revsetlang.py
--- a/mercurial/revsetlang.py
+++ b/mercurial/revsetlang.py
@@ -199,6 +199,12 @@ def getinteger(x, err, default=_notset):
     except ValueError:
         raise error.ParseError(err)
 
+def getboolean(x, err):
+    value = util.parsebool(getsymbol(x))
+    if value is not None:
+        return value
+    raise error.ParseError(err)
+
 def getlist(x):
     if not x:
         return []