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mercurial/templatefuncs.py
changeset 37931 faa41fd282d1
parent 37865 da083d9fafab
child 38144 bd7a3fa71a72 
--- a/mercurial/templatefuncs.py	Fri May 04 21:31:34 2018 -0700
+++ b/mercurial/templatefuncs.py	Thu Apr 19 21:00:12 2018 +0900
@@ -113,6 +113,13 @@
         raise error.ParseError(_('extdata expects one argument'))
 
     source = evalstring(context, mapping, args['source'])
+    if not source:
+        sym = templateutil.findsymbolicname(args['source'])
+        if sym:
+            raise error.ParseError(_('empty data source specified'),
+                                   hint=_("did you mean extdata('%s')?") % sym)
+        else:
+            raise error.ParseError(_('empty data source specified'))
     cache = context.resource(mapping, 'cache').setdefault('extdata', {})
     ctx = context.resource(mapping, 'ctx')
     if source in cache:
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