Allow `ask' action to customize choices prompt

features/recipes/ask.feature

@@ -4,9 +4,9 @@ Feature: `ask' recipe keyword
     Given a recipe with:
       """
       task :ask_letter do
-        letter = ask 'Which letter?', %w[A B]
+        letter = ask 'Which letter?', [[:a, ?A], [:b, ?B]]
 
-        echo letter
+        echo letter.inspect
       end
       """
     When I execute the recipe interactively
@@ -17,6 +17,6 @@ Feature: `ask' recipe keyword
       0: A
       1: B
       Choice:
-      B
+      :b
       """
     And the exit status must be 0

lib/producer/core/prompter.rb

@@ -10,11 +10,11 @@ module Producer
 
       def prompt(question, choices)
         cs = choices.each_with_index.inject('') do |m, (c, i)|
-          m += "#{i}: #{c}\n"
+          m += "#{i}: #{c.last}\n"
         end
         output.puts "#{question}\n#{cs}Choice:"
         choice = input.gets
-        choices[choice.to_i]
+        choices[choice.to_i].first
       end
     end
   end

spec/producer/core/prompter_spec.rb

@@ -19,7 +19,7 @@ module Producer::Core
 
     describe '#prompt' do
       let(:question)  { 'Which letter?' }
-      let(:choices)   { %w[A B] }
+      let(:choices)   { [[:a, ?A], [:b, ?B]] }
 
       it 'prompts choices' do
         prompter.prompt question, choices
@@ -34,7 +34,7 @@ module Producer::Core
       it 'returns value for entry chosen by user' do
         input.puts '1'
         input.rewind
-        expect(prompter.prompt question, choices).to eq 'B'
+        expect(prompter.prompt question, choices).to eq :b
       end
     end
   end

spec/producer/core/task/dsl_spec.rb

@@ -85,7 +85,7 @@ module Producer::Core
 
     describe '#ask' do
       let(:question)        { 'Which letter?' }
-      let(:choices)         { %w[A B] }
+      let(:choices)         { [[:a, ?A], [:b, ?B]] }
       let(:prompter_class)  { double('prompter class').as_null_object }
       subject(:ask)         { dsl.ask question, choices,
                               prompter: prompter_class }