allow set to take a proc

README.md

@@ -22,12 +22,12 @@ TODO:
   - [x] support set/fetch/role configuration
   - [x] basic deploy
   - [x] ask
-  - [ ] support existing significant configuration variables
   - [ ] prefer `roles(:all)` over `all_roles`
   - [ ] support primary servers `on primary(:db)`
   - [ ] basic rollback
-  - [ ] add examples to README
+  - [ ] support existing significant configuration variables
   - [ ] set configuration defaults, add commented out examples to templates
+  - [ ] add examples to README
 
 ## Installation
 

lib/capistrano/configuration.rb

@@ -103,9 +103,6 @@ module Capistrano
         @response ||= $stdin.gets.chomp
       end
 
-      def set(key, value)
-      end
-
       def question
         I18n.t(:question, key: key, default_value: default, scope: :capistrano)
       end

spec/lib/capistrano/configuration_spec.rb

@@ -97,7 +97,14 @@ module Capistrano
         end
       end
 
-      context 'block is passed' do
+      context 'value is a proc' do
+        subject { config.fetch(:key, Proc.new { :proc } ) }
+        it 'calls the proc' do
+          expect(subject).to eq :proc
+        end
+      end
+
+      context 'block is passed to fetch' do
         subject { config.fetch(:key, :default) { fail 'we need this!' } }
 
         it 'returns the block value' do