From 27bf980036f72a7ed00227c057279aa4728bf915 Mon Sep 17 00:00:00 2001
From: Ahmad Faizal B H <ab4953@columbia.edu>
Date: Sat, 1 Aug 2020 17:12:41 +0530
Subject: [PATCH] fix register_call function

---
 README.md           | 20 +++++++++++++++++++-
 chatbot/__init__.py |  8 ++++++--
 2 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index a12c1a5d..417fcef8 100644
--- a/README.md
+++ b/README.md
@@ -102,6 +102,7 @@ In think mode
 ```
 
 ## Get matched group
+for grouping in regex refer [Python regular expression docs](https://docs.python.org/3/howto/regex.html#non-capturing-and-named-groups)
 #### Get N<sup>th</sup> matched group of client pattern
 ```
 %N
@@ -110,8 +111,16 @@ Example to get first matched
 ```
 %1
 ```
+#### Get matching named group of client pattern
+```
+%Client_pattern_group_name
+```
+Example to get matching named group `person`
+```
+%person
+```
 
-#### Get N<sup>th</sup> matched group of bots pattern
+#### Get N<sup>th</sup> matched group of bots message pattern
 ```
 %!N
 ```
@@ -120,6 +129,15 @@ Example to get first matched
 %!1
 ```
 
+#### Get matching named group of bots message pattern
+```
+%!Bot_pattern_group_name
+```
+Example to get matching named group `region`
+```
+%!region
+```
+
 ## Recursion
 Get response as if client said this new statement
 ```
diff --git a/chatbot/__init__.py b/chatbot/__init__.py
index 18f6c6dc..4ab8a699 100644
--- a/chatbot/__init__.py
+++ b/chatbot/__init__.py
@@ -44,7 +44,7 @@ def call(self, string, session_id):
 _function_call = MultiFunctionCall()
 
 
-def register_call(function_name):
+def register_call(function_name=None):
     def wrap(function):
         if type(function).__name__ != 'function':
             raise TypeError("function expected found %s" % type(function).__name__)
@@ -54,10 +54,14 @@ def wrap(function):
         mapper[name] = function
         return function
 
+    if function_name is None:
+        return register_call
     if type(function_name).__name__ in ('unicode', 'str'):
         name = function_name
         return wrap
-    name = function.__name__
+    if type(function_name).__name__ != 'function':
+        raise TypeError("String is expected for function name found %s" % type(function).__name__)
+    name = function_name.__name__
     return wrap(function_name)