From fd732f8d3b2546ed15e6e7f1df7dcd2353397a16 Mon Sep 17 00:00:00 2001
From: Daniel Hokka Zakrisson <daniel@hozac.com>
Date: Thu, 22 Nov 2012 23:10:11 +0100
Subject: [PATCH] Add when_boolean

Fixes #1567.
---
 lib/ansible/playbook/task.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/ansible/playbook/task.py b/lib/ansible/playbook/task.py
index fb74d6032d..3e3393e95c 100644
--- a/lib/ansible/playbook/task.py
+++ b/lib/ansible/playbook/task.py
@@ -227,6 +227,14 @@ class Task(object):
                 else:
                     tcopy[i] = t
             return " ".join(tcopy)
+
+        # when_boolean
+        elif tokens[0] in [ 'bool', 'boolean' ]:
+            tcopy = tokens[1:]
+            for (i, t) in enumerate(tcopy):
+                if t.find("$") != -1:
+                    tcopy[i] = "(is_set('''%s''') and '''%s'''.lower() not in ('false', 'none', '0', ''))" % (t, t)
+            return " ".join(tcopy)
  
         else:
             raise errors.AnsibleError("invalid usage of when_ operator: %s" % expression)