Use TOML configuration

lib/up2date.rb

@@ -36,7 +36,7 @@ module SlackBuilder
     GQL
     private_constant :GITHUB_QUERY
 
-    def initialize(owner, name, version_transform = ->(v) { v.delete_prefix 'v' })
+    def initialize(owner, name, version_transform = nil)
       super()
 
       @owner = owner
@@ -45,6 +45,16 @@ module SlackBuilder
     end
 
     def latest
+      if @version_transform.nil?
+        `./bin/slackbuilder github #{@owner} #{@name}`.strip
+      else
+        latest_with_transform
+      end
+    end
+
+    private
+
+    def latest_with_transform
       post_data = {
         'query' => GITHUB_QUERY,
         'variables' => { 'name' => @name, 'owner' => @owner }
@@ -57,8 +67,6 @@ module SlackBuilder
       filter_versions_from_response JSON.parse(response.body)
     end
 
-    private
-
     def filter_versions_from_response(response)
       response['data']['repository']['refs']['nodes']
         .map { |node| @version_transform.call node['name'] }