[WIP] Join messages are removed from any channel @hackbot is part of

app/models/hackbot/dispatcher.rb

@@ -7,6 +7,7 @@ class Dispatcher
       Hackbot::Interactions::Gifs,
       Hackbot::Interactions::Help,
       Hackbot::Interactions::Lookup,
+      Hackbot::Interactions::RemoveJoinMessage,
       Hackbot::Interactions::SetPoc,
       Hackbot::Interactions::Sql,
       Hackbot::Interactions::Stats,

app/models/hackbot/interactions/remove_join_message.rb

@@ -0,0 +1,13 @@
+module Hackbot
+  module Interactions
+    class RemoveJoinMessage < TextConversation
+      def should_start?
+        super && event[:subtype] == 'channel_join'
+      end
+
+      def start
+        del_msg(event[:channel], event[:ts])
+      end
+    end
+  end
+end

app/models/hackbot/slack_interaction.rb

@@ -18,6 +18,10 @@ def send_msg(channel, msg)
       ::SlackClient::Chat.send_msg(channel, nil, access_token, opts)
     end
 
+    def del_msg(channel, ts)
+      ::SlackClient::Chat.delete(channel, ts, access_token)
+    end
+
     def attach(channel, *attachments)
       send_msg(channel, attachments: attachments)
     end

lib/slack_client/chat.rb

@@ -15,5 +15,9 @@ def self.send_msg(channel, text, access_token, extra_params = {})
 
       SlackClient.rpc('chat.postMessage', access_token, extra_params)
     end
+
+    def self.delete(channel, ts, access_token)
+      SlackClient.rpc('chat.delete', access_token, channel: channel, ts: ts)
+    end
   end
 end