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+..
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+
+=========================
+Improve "repeat" function
+=========================
+
+https://blueprints.launchpad.net/heat/+spec/improve-repeat-function
+
+This specification improves the "repeat" intrinsic function.
+
+Problem description
+===================
+
+The "repeat" function now only supports to iterates over all the permutations
+of the elements in the given lists if more than one key/value pair is
+included in the ``for_each`` section. Similar to how nested loops work in
+most programming languages.
+
+There are some user cases that user don't want to loop nested when using
+"repeat" function. For example, there are some list parameters:
+networks, subnets and ips::
+
+    parameters:
+      networks:
+        type: comma_delimited_list
+        default: "net1, net2, net3, ..., netn"
+      subnets:
+        type: comma_delimited_list
+        default: "sub1, sub2, sub3, ..., subn"
+      ips:
+        type: comma_delimited_list
+        default: "ip1, ip2, ip3, ..., ipn"
+
+and user want to create a server with several nics::
+
+  resources:
+    my_server:
+      type: OS::Nova::Server
+      properties:
+        ..... //some properties
+        networks:
+        - network: net1
+          subnet: sub1
+          fixed_ip: ip1
+        - network: net2
+          subnet: sub2
+          fixed_ip: ip2
+        - network: net3
+          subnet: sub3
+          fixed_ip: ip3
+        - ...
+        ...
+
+The "repeat" function is a good choose for this case. But now
+"repeat" function will do nested loops to iterate the over all the
+permutations of the elements in the given lists:
+[[net1, net2, net3, ...],[sub1, sub2, sub3, ...], [ip1, ip2, ip3, ...]]
+Take the example of two items for each list::
+
+   ...
+   networks:
+     repeat:
+       for_each:
+         %net%: [net1, net2]
+         %sub%: [sub1, sub2]
+         %ip%: [ip1, ip2]
+       template:
+         network: %net%
+         subnet: %sub%
+         fixed_ip: %ip%
+
+We will get the result after resolved the function::
+
+   [{'fixed_ip': 'ip1', 'network': 'net1', 'subnet': 'sub1'},
+    {'fixed_ip': 'ip2', 'network': 'net1', 'subnet': 'sub1'},
+    {'fixed_ip': 'ip1', 'network': 'net1', 'subnet': 'sub2'},
+    {'fixed_ip': 'ip2', 'network': 'net1', 'subnet': 'sub2'},
+    {'fixed_ip': 'ip1', 'network': 'net2', 'subnet': 'sub1'},
+    {'fixed_ip': 'ip2', 'network': 'net2', 'subnet': 'sub1'},
+    {'fixed_ip': 'ip1', 'network': 'net2', 'subnet': 'sub2'},
+    {'fixed_ip': 'ip2', 'network': 'net2', 'subnet': 'sub2']
+
+But what the user want is two nics::
+
+    [{'fixed_ip': 'ip1', 'network': 'net1', 'subnet': 'sub1'},
+     {'fixed_ip': 'ip2', 'network': 'net2', 'subnet': 'sub2']
+
+
+Proposed change
+===============
+
+This proposal improves the "repeat" function to support above the user case.
+Add a boolean flag section "permutations" for "repeat", and the default value
+is 'True' to make sure the compatibility. Then the "repeat" function would be
+used as follows::
+
+   resources:
+      my_server:
+        type: OS::Nova::Server
+        properties:
+          (...other properties)
+          networks:
+            repeat:
+              permutations: False
+              for_each:
+                %net%: { get_param: nets }
+                %sub%: { get_param: subnets }
+                %ip%: {get_param: ips}
+              template:
+                network: %net%
+                subnet: %sub%
+                fixed_ip: %ip%
+
+As above, set the section 'permutations' to False, then the result of the
+function will satisfy the user's requirement.
+
+Notes:
+   There is a constraint for it: the length of lists should be equal.
+
+Alternatives
+------------
+
+None
+
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  huangtianhua@huawei.com
+
+Milestones
+----------
+
+Target Milestone for completion:
+  Pike-1
+
+Work Items
+----------
+
+* Add "permutations" section for ``repeat`` function, and
+  implement the new replacement method.
+* Documentation.
+* Add related tests.
+* Add template examples.
+
+Dependencies
+============
+
+None