Allow only_if/when_* on task includes and apply it on all tasks within

lib/ansible/utils/__init__.py

@@ -476,4 +476,57 @@ def boolean(value):
     else:
         return False
 
+def compile_when_to_only_if(expression):
+    ''' 
+    when is a shorthand for writing only_if conditionals.  It requires less quoting
+    magic.  only_if is retained for backwards compatibility.
+    '''
+
+    # when: set $variable
+    # when: unset $variable
+    # when: int $x >= $z and $y < 3
+    # when: int $x in $alist
+    # when: float $x > 2 and $y <= $z
+    # when: str $x != $y
+
+    if type(expression) not in [ str, unicode ]:
+        raise errors.AnsibleError("invalid usage of when_ operator: %s" % expression)
+    tokens = expression.split()
+    if len(tokens) < 2:
+        raise errors.AnsibleError("invalid usage of when_ operator: %s" % expression)
+
+    # when_set / when_unset
+    if tokens[0] in [ 'set', 'unset' ]:
+        if len(tokens) != 2:
+            raise errors.AnsibleError("usage: when: <set|unset> <$variableName>")
+        return "is_%s('''%s''')" % (tokens[0], tokens[1])
+
+    # when_integer / when_float / when_string
+    elif tokens[0] in [ 'integer', 'float', 'string' ]:
+        cast = None
+        if tokens[0] == 'integer':
+            cast = 'int'
+        elif tokens[0] == 'string':
+            cast = 'str'
+        elif tokens[0] == 'float':
+            cast = 'float'
+        tcopy = tokens[1:]
+        for (i,t) in enumerate(tokens[1:]):
+            if t.find("$") != -1:
+                # final variable substitution will happen in Runner code
+                tcopy[i] = "%s('''%s''')" % (cast, t)
+            else:
+                tcopy[i] = t
+        return " ".join(tcopy)
+
+    # when_boolean
+    elif tokens[0] in [ 'bool', 'boolean' ]:
+        tcopy = tokens[1:]
+        for (i, t) in enumerate(tcopy):
+            if t.find("$") != -1:
+                tcopy[i] = "(is_set('''%s''') and '''%s'''.lower() not in ('false', 'no', 'n', 'none', '0', ''))" % (t, t)
+        return " ".join(tcopy)
+
+    else:
+        raise errors.AnsibleError("invalid usage of when_ operator: %s" % expression)