add headerstyle alias for header_format

add delegates to dsl

Author: thambley

lib/active_admin/xls/builder.rb

@@ -40,6 +40,8 @@ def header_format
         @header_format ||= {}
       end
 
+      alias header_style header_format
+
       # This has can be used to override the default header style for your
       # sheet. Any values you provide will be merged with the default styles.
       # Precidence is given to your hash
@@ -49,6 +51,8 @@ def header_format=(format_hash)
         @header_format = header_format.merge(format_hash)
       end
 
+      alias header_style= header_format=
+
       # Indicates that we do not want to serialize the column headers
       def skip_header
         @skip_header = true

lib/active_admin/xls/dsl.rb

@@ -2,11 +2,13 @@ module ActiveAdmin
   module Xls
     # extends activeadmin dsl to include xls
     module DSL
-      delegate(:ignore_columns,
+      delegate(:after_filter,
+               :before_filter,
                :column,
-               :after_filter,
-               :i18n_scope,
+               :delete_columns,
                :header_format,
+               :header_style,
+               :i18n_scope,
                :skip_header,
                :whitelist,
                to: :xls_builder,