Refactor and simplify recipe DSL evaluation usages:

Remove most of recipe evaluation code in Recipe class, and rely on
Recipe::DSL to get evaluated recipes.

* Remove Recipe#evaluate call from CLI, rely on
  Recipe.evaluate_from_file to get the evaluated recipe;
* Implement Recipe.evaluate_from_file(filepath, env);
* Implement Recipe::DSL.evaluate(code, env);
* Remove code and filepath accessor on Recipe;
* Remove Recipe.from_file and Recipe#evaluate methods;
* Move task evaluations in Recipe::DSL#evaluate;
* Modify Recipe constructor so that it accepts tasks as argument.

lib/producer/core/cli.rb

@@ -12,7 +12,6 @@ module Producer
 
       def run!
         check_arguments!
-        recipe.evaluate(env)
         worker.process recipe.tasks
       end
 
@@ -25,7 +24,7 @@ module Producer
       end
 
       def recipe
-        @recipe ||= Recipe.from_file(@arguments.first)
+        @recipe ||= Recipe.evaluate_from_file(@arguments.first, env)
       end
 
       def worker

lib/producer/core/recipe.rb

@@ -1,22 +1,14 @@
 module Producer
   module Core
     class Recipe
-      attr_reader :code, :filepath, :tasks
+      attr_accessor :tasks
 
-      def self.from_file(filepath)
-        new(File.read(filepath), filepath)
+      def self.evaluate_from_file(filepath, env)
+        DSL.evaluate(File.read(filepath), env)
       end
 
-      def initialize(code, filepath = nil)
-        @code     = code
-        @filepath = filepath
-        @tasks    = []
-      end
-
-      def evaluate(env)
-        dsl = DSL.new(@code).evaluate(env)
-        dsl.tasks.map { |e| e.evaluate env }
-        @tasks = dsl.tasks
+      def initialize(tasks = [])
+        @tasks = tasks
       end
     end
   end

lib/producer/core/recipe/dsl.rb

@@ -4,6 +4,11 @@ module Producer
       class DSL
         attr_reader :tasks
 
+        def self.evaluate(code, env)
+          dsl = new(code).evaluate(env)
+          Recipe.new(dsl.tasks)
+        end
+
         def initialize(code = nil, &block)
           @code   = code
           @block  = block
@@ -17,6 +22,7 @@ module Producer
           else
             instance_eval &@block
           end
+          @tasks.each { |e| e.evaluate env }
           self
         end
 

spec/producer/core/cli_spec.rb

@@ -27,11 +27,6 @@ module Producer::Core
         cli.run!
       end
 
-      it 'evaluates the recipe with the environment' do
-        expect(cli.recipe).to receive(:evaluate).with(cli.env)
-        cli.run!
-      end
-
       it 'processes the tasks with the worker' do
         allow(cli.recipe).to receive(:tasks) { [:some_task] }
         expect(cli.worker).to receive(:process).with([:some_task])
@@ -80,12 +75,12 @@ module Producer::Core
     describe '#recipe' do
       it 'builds a recipe' do
         expect(Recipe)
-          .to receive(:from_file).with(recipe_file)
+          .to receive(:evaluate_from_file).with(recipe_file, cli.env)
         cli.recipe
       end
 
       it 'returns the recipe' do
-        recipe = double('recipe')
+        recipe = double('recipe').as_null_object
         allow(Recipe).to receive(:new) { recipe }
         expect(cli.recipe).to be recipe
       end

spec/producer/core/recipe/dsl_spec.rb

@@ -8,6 +8,35 @@ module Producer::Core
     let(:env)     { double('env').as_null_object }
     subject(:dsl) { Recipe::DSL.new &code }
 
+    describe '.evaluate' do
+      let(:code) { 'nil' }
+
+      it 'builds a new DSL sandbox with given code' do
+        expect(Recipe::DSL).to receive(:new).once.with(code).and_call_original
+        Recipe::DSL.evaluate(code, env)
+      end
+
+      it 'evaluates the DSL sandbox code with given environment' do
+        dsl = double('dsl').as_null_object
+        allow(Recipe::DSL).to receive(:new) { dsl }
+        expect(dsl).to receive(:evaluate).with(env)
+        Recipe::DSL.evaluate(code, env)
+      end
+
+      it 'builds a recipe with evaluated tasks' do
+        dsl = Recipe::DSL.new('task(:some_task) { }')
+        allow(Recipe::DSL).to receive(:new) { dsl }
+        expect(Recipe).to receive(:new).with(dsl.tasks)
+        Recipe::DSL.evaluate(code, env)
+      end
+
+      it 'returns the recipe' do
+        recipe = double('recipe').as_null_object
+        allow(Recipe).to receive(:new) { recipe }
+        expect(Recipe::DSL.evaluate(code, env)).to be recipe
+      end
+    end
+
     describe '#initialize' do
       it 'assigns no task' do
         expect(dsl.instance_eval { @tasks }).to be_empty
@@ -30,7 +59,7 @@ module Producer::Core
     end
 
     describe '#tasks' do
-      let(:code) { proc { task(:some_task) } }
+      let(:code) { proc { task(:some_task) { } } }
 
       it 'returns registered tasks' do
         dsl.evaluate(env)
@@ -44,6 +73,14 @@ module Producer::Core
         expect { dsl.evaluate(env) }.to throw_symbol :recipe_code
       end
 
+      it 'evaluates the registered tasks' do
+        task = double('task')
+        allow(Task).to receive(:new) { task }
+        dsl = Recipe::DSL.new { task(:some_task) }
+        expect(task).to receive(:evaluate).with(env)
+        dsl.evaluate(env)
+      end
+
       it 'returns itself' do
         expect(dsl.evaluate(env)).to eq dsl
       end
@@ -81,11 +118,11 @@ module Producer::Core
       end
 
       describe '#task' do
-        let(:code) { proc { task(:first) { throw :first_task }; task(:last) } }
+        let(:code) { proc { task(:first) { :some_value }; task(:last) { } } }
 
         it 'register a task with its code' do
-          expect(dsl.tasks.first.name).to eq :first
-          expect { dsl.tasks.first.evaluate(env) }.to throw_symbol :first_task
+          expect(dsl.tasks.first.instance_eval { @block.call })
+            .to eq :some_value
         end
 
         it 'registers tasks in declaration order' do

spec/producer/core/recipe_spec.rb

@@ -4,76 +4,39 @@ module Producer::Core
   describe Recipe do
     include FixturesHelpers
 
-    let(:code)        { 'nil' }
-    subject(:recipe)  { Recipe.new(code) }
+    subject(:recipe) { Recipe.new }
 
-    describe '.from_file' do
-      let(:filepath)    { fixture_path_for 'recipes/empty.rb' }
-      subject(:recipe)  { Recipe.from_file(filepath) }
+    describe '.evaluate_from_file' do
+      let(:env)       { double('env') }
+      let(:filepath)  { fixture_path_for 'recipes/empty.rb' }
 
-      it 'builds a recipe whose code is read from given file path' do
-        expect(recipe.code).to eq File.read(filepath)
+      it 'delegates to DSL.evaluate with the recipe file content' do
+        expect(Recipe::DSL)
+          .to receive(:evaluate).with(File.read(filepath), env)
+        Recipe.evaluate_from_file(filepath, env)
       end
 
-      it 'builds a recipe whose file path is set from given file path' do
-        expect(recipe.filepath).to eq filepath
+      it 'returns the evaluated recipe' do
+        recipe = double('recipe')
+        allow(Recipe::DSL).to receive(:evaluate) { recipe }
+        expect(Recipe.evaluate_from_file(filepath, env)).to be recipe
       end
     end
 
     describe '#initialize' do
-      it 'assigns nil as a default filepath' do
-        expect(recipe.filepath).to be nil
+      context 'without arguments' do
+        it 'assigns no task' do
+          expect(recipe.tasks).to be_empty
+        end
       end
 
-      it 'has no task' do
-        expect(recipe.tasks).to be_empty
-      end
-    end
+      context 'when tasks are given as argument' do
+        let(:tasks)   { [Task.new(:some_task)] }
+        let(:recipe)  { Recipe.new(tasks) }
 
-    describe '#code' do
-      it 'returns the assigned code' do
-        expect(recipe.code).to be code
-      end
-    end
-
-    describe '#filepath' do
-      let(:filepath)  { 'some_file_path' }
-      let(:recipe)    { Recipe.new(code, filepath) }
-
-      it 'returns the assigned file path' do
-        expect(recipe.filepath).to eq filepath
-      end
-    end
-
-    describe '#evaluate' do
-      let(:env) { double('env').as_null_object }
-
-      it 'builds a recipe DSL sandbox' do
-        expect(Recipe::DSL).to receive(:new).once.with(code).and_call_original
-        recipe.evaluate(env)
-      end
-
-      it 'evaluates the DSL sandbox with the environment given as argument' do
-        dsl = double('dsl').as_null_object
-        allow(Recipe::DSL).to receive(:new) { dsl }
-        expect(dsl).to receive(:evaluate)
-        recipe.evaluate(env)
-      end
-
-      it 'evaluates the DSL sandbox tasks' do
-        task = double('task')
-        allow(Task).to receive(:new) { task }
-        dsl = Recipe::DSL.new { task(:some_task) }
-        allow(Recipe::DSL).to receive(:new) { dsl }
-        expect(task).to receive(:evaluate).with(env)
-        recipe.evaluate(env)
-      end
-
-      it 'assigns the evaluated tasks' do
-        dsl = Recipe::DSL.new { task(:some_task) { } }
-        allow(Recipe::DSL).to receive(:new) { dsl }
-        recipe.evaluate(env)
-        expect(recipe.tasks.first.name).to eq :some_task
+        it 'assigns the tasks' do
+          expect(recipe.tasks).to eq tasks
+        end
       end
     end
   end