Implement `-t' CLI option switch to specify target

features/cli_target.feature

@@ -0,0 +1,15 @@
+Feature: CLI target option
+
+  Background:
+    Given a recipe with:
+      """
+      target 'some_host.example'
+
+      task :some_task do
+        echo env.target
+      end
+      """
+
+  Scenario: prints tasks name
+    When I successfully execute the recipe with option -t other_host.example
+    Then the output must contain exactly "other_host.example\n"

features/steps/recipe_steps.rb

@@ -11,7 +11,7 @@ When /^I successfully execute the recipe$/ do
   assert_exit_status 0
 end
 
-When /^I successfully execute the recipe with option (-\w)$/ do |option|
+When /^I successfully execute the recipe with option (-.+)$/ do |option|
   run_simple "producer #{option} recipe.rb", false
   assert_exit_status 0
 end

lib/producer/core/cli.rb

@@ -34,12 +34,14 @@ module Producer
       end
 
       def parse_arguments!
-        @arguments = arguments.inject([]) do |m, e|
+        @arguments = arguments.each_with_index.inject([]) do |m, (e, i)|
           case e
           when '-v'
             env.verbose = true
           when '-n'
             env.dry_run = true
+          when '-t'
+            env.target = arguments.delete_at i + 1
           else
             m << e
           end

lib/producer/core/recipe/dsl.rb

@@ -25,7 +25,7 @@ module Producer
         end
 
         def target(hostname)
-          env.target = hostname
+          env.target ||= hostname
         end
 
         def task(name, *args, &block)

spec/producer/core/cli_spec.rb

@@ -122,7 +122,7 @@ module Producer::Core
 
     describe '#parse_arguments!' do
       context 'with options' do
-        let(:options) { %w[-v] }
+        let(:options) { %w[-v -t some_host.example] }
 
         before { cli.parse_arguments! }
 
@@ -131,6 +131,8 @@ module Producer::Core
         end
 
         context 'verbose' do
+          let(:options) { %w[-v] }
+
           it 'enables env verbose mode' do
             expect(cli.env).to be_verbose
           end
@@ -143,6 +145,14 @@ module Producer::Core
             expect(cli.env).to be_dry_run
           end
         end
+
+        context 'target' do
+          let(:options) { %w[-t some_host.example] }
+
+          it 'assigns the given target to the env' do
+            expect(cli.env.target).to eq 'some_host.example'
+          end
+        end
       end
 
       context 'without arguments' do

spec/producer/core/recipe/dsl_spec.rb

@@ -65,9 +65,19 @@ module Producer::Core
       describe '#target' do
         let(:host) { 'some_host.example' }
 
-        it 'registers the target host in the env' do
-          dsl.target host
-          expect(env.target).to eq host
+        context 'when env has no assigned target' do
+          it 'registers the target host in the env' do
+            dsl.target host
+            expect(env.target).to eq host
+          end
+        end
+
+        context 'when env has an assigned target' do
+          before { env.target = 'already_assigned_host.example' }
+
+          it 'does not change env target' do
+            expect { dsl.target host }.not_to change { env.target }
+          end
         end
       end