plugins/explain.py: Added explanation for do not ask to ask

This patch adds response in case a user asks abrupt question.

Closes #389

config.py

@@ -21,6 +21,9 @@
 if not os.environ.get('COBOT_PREFIX'):
     BOT_ALT_PREFIXES = ('cobot ', )
 
+BOT_DEPRECATED_PREFIXES = os.environ.get(
+    'BOT_DEPRECATED_PREFIXES', '').split() or ('cobot ', )
+
 BOT_ADMINS = os.environ.get('BOT_ADMINS', '').split() or ('*@localhost', )
 # Text is a special case
 if BACKEND == 'Text':

plugins/deprecate_bot_prefixes.plug

@@ -0,0 +1,9 @@
+[Core]
+name = deprecate_bot_prefixes
+module = deprecate_bot_prefixes
+
+[Documentation]
+description = A callback for every message that starts with depecrated prefix, hence, leaving a deprecation notice
+
+[Python]
+version = 3

plugins/deprecate_bot_prefixes.py

@@ -0,0 +1,22 @@
+from errbot import BotPlugin
+
+
+class DeprecateBotPrefixes(BotPlugin):
+    """
+    A callback for every message that starts with depecrated prefix, hence,
+    leaving a deprecation notice
+    """
+
+    def callback_message(self, msg):
+        """
+        Notify the user issuing the command that use deprecated prefix.
+        """
+
+        for deprecated_prefix in self.bot_config.BOT_DEPRECATED_PREFIXES:
+            if msg.body.startswith(deprecated_prefix):
+                self.send(
+                    msg.frm,
+                    "@{} usage of {} has been deprecated, please use {} "
+                    "from now on.".format(msg.frm.nick, deprecated_prefix,
+                                          self.bot_config.BOT_PREFIX)
+                )

plugins/explain.py

@@ -83,6 +83,16 @@ class Explain(BotPlugin):
                      'newcomer Pull Request\n- merge a difficulty/low Pull '
                      'Request\n- review at least a difficulty/low or higher '
                      'Pull Request'
+        'do not ask to ask': 'This is a lazy way of asking your question '
+                             'because  you\'re asking for more than what '
+                             'you think you\'re asking. The solution is not '
+                             'to ask to ask, but just to ask by actaully '
+                             'formalizing it in words. Someone who is idling '
+                             'on the channel and only occasionally glances'
+                             'at what\'s going on is unlikely to answer '
+                             'to your "asking to ask" question, but your '
+                             'actual problem description may pique their '
+                             'interest and get them to answer.'
     }
 
     ERROR_MSG = (

tests/deprecate_bot_prefixes_test.py

@@ -0,0 +1,7 @@
+pytest_plugins = ['errbot.backends.test']
+extra_plugin_dir = 'plugins'
+
+def test_deprecated_prefixes_other(testbot):
+    testbot.bot_config.BOT_DEPRECATED_PREFIXES = ('oldbot', 'deprecatedbot')
+    testbot.assertCommand('oldbot just a test', 'has been deprecated')
+    testbot.assertCommand('deprecatedbot just a test', 'has been deprecated')