Add button template (#7)

README.md

@@ -55,6 +55,7 @@ Some advanced features:
 ├── modules/         # home for various features
 ├── modules/src/     # code goes here
 ├── modules/tests/   # tests go here
+├── templates/       # for sending structured messages
 ├── CONTRIBUTING.md  # contributing guidelines
 └── jarvis.py        # the main bot
 ```

templates/button.py

@@ -0,0 +1,52 @@
+from copy import copy
+
+button = {
+    'type': '',
+    'title': '',
+    'url': '',
+    'payload': ''
+}
+
+def web_url(title, url):
+    web_url_button = copy(button)
+    web_url_button['type'] = 'web_url'
+    web_url_button['title'] = title
+    web_url_button['url'] = url
+    return web_url_button
+
+def postback(title, payload):
+    postback_button = copy(button)
+    postback_button['type'] = 'postback'
+    postback_button['title'] = title
+    postback_button['payload'] = payload
+    return postback_button
+
+template = {
+    'template_type': 'button',
+    'value': {
+        'attachment': {
+            'type': 'template',
+            'payload': {
+                'template_type': 'button',
+                'text': '',
+                'buttons': []
+            }
+        }
+    }
+}
+
+class ButtonTemplate:
+    def __init__(self, text=''):
+        self.template = template['value']
+        self.text = text
+    def add_web_url(self, title='', url=''):
+        web_url_button = web_url(title, url)
+        self.template['attachment']['payload']['buttons'].append(web_url_button)
+    def add_postback(self, title='', payload=''):
+        postback_button = postback(title, payload)
+        self.template['attachment']['payload']['buttons'].append(postback_button)
+    def set_text(self, text=''):
+        self.text = text
+    def get_message(self):
+        self.template['attachment']['payload']['text'] = self.text
+        return self.template