Merge pull request #37 from github/add_attachment_support

Add support for "attachment" feature

docs/protocol-description.md

@@ -70,6 +70,7 @@ but it is important that `result` be sufficient on its own.
     * `image_url`: An image URL to display as the button, will generally take precedence
     * `command`: The command to use when the button is clicked
  * `image_url`: An image URL to be included with the response
+ * `attachment`: Optional boolean which hints the recipient to format the message as an attachment, if supported by its protocol. Because this is a hint, it may be ignored by clients. If not specified, it defaults to false.
 
 CRPC may also produce error JSON according to the JSON-RPC spec, consisting of
 an object containing an `error` object with a `message` string. This is

lib/chatops/controller.rb

@@ -56,8 +56,13 @@ module Chatops
       params["params"] || {}
     end
 
-    def jsonrpc_success(message)
-      jsonrpc_response :result => message.to_s
+    # `options` supports any of the optional fields documented
+    # in the [protocol](../../docs/protocol-description.md).
+    def jsonrpc_success(message, options: {})
+      response = { :result => message.to_s }
+      # do not allow options to override message
+      options.delete(:result)
+      jsonrpc_response response.merge(options)
     end
     alias_method :chatop_send, :jsonrpc_success