Implement target recipe keyword feature

features/cli/target.feature

@@ -0,0 +1,12 @@
+Feature: target recipe keyword
+
+  Scenario: registers the target host on which tasks should be evaluated
+    Given a recipe with:
+      """
+      target 'some_host.example'
+
+      puts env.target
+      """
+    When I execute the recipe
+    Then the exit status must be 0
+    And the output must contain exactly "some_host.example\n"

lib/producer/core/env.rb

@@ -1,10 +1,12 @@
 module Producer
   module Core
     class Env
-      attr_reader :current_recipe
+      attr_reader   :current_recipe
+      attr_accessor :target
 
       def initialize(recipe)
         @current_recipe = recipe
+        @target         = nil
       end
     end
   end

spec/producer/core/env_spec.rb

@@ -5,10 +5,25 @@ module Producer::Core
     let(:recipe)  { Recipe.new(proc { nil }) }
     subject(:env) { Env.new(recipe) }
 
+    describe '#initialize' do
+      it 'has no target' do
+        expect(env.target).not_to be
+      end
+    end
+
     describe '#current_recipe' do
       it 'returns the assigned current recipe' do
         expect(env.current_recipe).to eq recipe
       end
     end
+
+    describe '#target' do
+      let(:target) { Object.new }
+
+      it 'returns the defined target' do
+        env.target = target
+        expect(env.target).to eq target
+      end
+    end
   end
 end

spec/producer/core/recipe/dsl_spec.rb

@@ -87,6 +87,15 @@ module Producer::Core
         end
       end
 
+      describe '#target' do
+        let(:code) { proc { target 'some_host.example' } }
+
+        it 'registers the target host in the env' do
+          expect(env).to receive(:target=).with('some_host.example')
+          dsl.evaluate(env)
+        end
+      end
+
       describe '#tasks' do
         let(:code) { proc { task(:some_task) } }