[api-ref] Added template-function-list

Change-Id: I4a11f2937606131a9dd467ead87f9b6ad8c2df2d
Closes-Bug: #1473814

api-ref/source/v1/parameters.yaml

@@ -70,6 +70,12 @@ type_name:
   in: path
   required: false
   type: string
+template_version:
+  description: |
+    The version of the heat template.
+  in: path
+  required: true
+  type: string
 
 # variables in query
 action_3:

api-ref/source/v1/samples/template-functions-list-response.json

@@ -0,0 +1,44 @@
+{
+    "template_functions": [
+        {
+            "functions": "Fn::Select",
+            "description": "A function for selecting an item from a list or map."
+        },
+        {
+            "functions": "repeat",
+            "description": "A function for iterating over a list of items."
+        },
+        {
+            "functions": "resource_facade",
+            "description": "A function for retrieving data in a parent provider template."
+        },
+        {
+            "functions": "list_join",
+            "description": "A function for joining strings."
+        },
+        {
+            "functions": "str_replace",
+            "description": "A function for performing string substitutions."
+        },
+        {
+            "functions": "get_attr",
+            "description": "A function for resolving resource attributes."
+        },
+        {
+            "functions": "get_param",
+            "description": "A function for resolving parameter references."
+        },
+        {
+            "functions": "get_file",
+            "description": "A function for including a file inline."
+        },
+        {
+            "functions": "digest",
+            "description": "A function for performing digest operations."
+        },
+        {
+            "functions": "get_resource",
+            "description": "A function for resolving resource references."
+        }
+    ]
+}

api-ref/source/v1/stack-templates.inc

@@ -4,6 +4,34 @@
 Templates
 =========
 
+List template functions
+=======================
+
+.. rest_method::  GET /v1/{tenant_id}/template_versions/{template_version}/functions
+
+Lists all available functions for a template version.
+
+
+Normal response codes: 200
+Error response codes:401,400,
+
+
+Request
+-------
+
+.. rest_parameters:: parameters.yaml
+
+   - tenant_id: tenant_id
+   - template_version: template_version
+
+
+Response Example
+----------------
+
+.. literalinclude:: samples/template-functions-list-response.json
+   :language: javascript
+
+