Raise proper error when no compilation rule memory exists

nanoc · Jul 24, 2016 · b255927 · b255927
1 parent 5b2e9a6
commit b255927
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Showing 2 changed files with 65 additions and 45 deletions.
diff --git a/lib/nanoc/rule_dsl/rule_memory_calculator.rb b/lib/nanoc/rule_dsl/rule_memory_calculator.rb
@@ -18,6 +18,12 @@ def initialize(layout)
       end
     end
 
+    class NoRuleMemoryForItemRepException < ::Nanoc::Error
+      def initialize(item)
+        super("There is no compilation rule specified for #{item.inspect}")
+      end
+    end
+
     # @api private
     attr_accessor :rules_collection
 
@@ -63,14 +69,16 @@ def snapshots_defs_for(rep)
     #
     # @return [Nanoc::Int::RuleMemory]
     def new_rule_memory_for_rep(rep)
-      # FIXME: What if #compilation_rule_for returns nil?
-
       dependency_tracker = Nanoc::Int::DependencyTracker::Null.new
       view_context = @site.compiler.create_view_context(dependency_tracker)
 
       executor = Nanoc::RuleDSL::RecordingExecutor.new(rep, @rules_collection, @site)
       rule = @rules_collection.compilation_rule_for(rep)
 
+      unless rule
+        raise NoRuleMemoryForItemRepException.new(rep)
+      end
+
       executor.snapshot(rep, :raw)
       executor.snapshot(rep, :pre, final: false)
       rule.apply_to(rep, executor: executor, site: @site, view_context: view_context)

diff --git a/spec/nanoc/rule_dsl/rule_memory_calculator_spec.rb b/spec/nanoc/rule_dsl/rule_memory_calculator_spec.rb
@@ -21,58 +21,69 @@
       let(:view_context) { double(:view_context) }
 
       before do
-        rules_proc = proc do
-          filter :erb, speed: :over_9000
-          layout '/default.*'
-          filter :typohero
-        end
-        rule = Nanoc::RuleDSL::Rule.new(Nanoc::Int::Pattern.from('/list.*'), :csv, rules_proc)
-        rules_collection.add_item_compilation_rule(rule)
-
         expect(compiler).to receive(:create_view_context).and_return(view_context)
       end
 
-      example do
-        subject
+      context 'no rules exist' do
+        it 'raises error' do
+          error = Nanoc::RuleDSL::RuleMemoryCalculator::NoRuleMemoryForItemRepException
+          expect { subject }.to raise_error(error)
+        end
+      end
 
-        expect(subject.size).to eql(8)
+      context 'rules exist' do
+        before do
+          rules_proc = proc do
+            filter :erb, speed: :over_9000
+            layout '/default.*'
+            filter :typohero
+          end
+          rule = Nanoc::RuleDSL::Rule.new(Nanoc::Int::Pattern.from('/list.*'), :csv, rules_proc)
+          rules_collection.add_item_compilation_rule(rule)
+        end
+
+        example do
+          subject
 
-        expect(subject[0]).to be_a(Nanoc::Int::RuleMemoryActions::Snapshot)
-        expect(subject[0].snapshot_name).to eql(:raw)
-        expect(subject[0]).to be_final
-        expect(subject[0].path).to be_nil
+          expect(subject.size).to eql(8)
 
-        expect(subject[1]).to be_a(Nanoc::Int::RuleMemoryActions::Snapshot)
-        expect(subject[1].snapshot_name).to eql(:pre)
-        expect(subject[1]).not_to be_final
-        expect(subject[1].path).to be_nil
+          expect(subject[0]).to be_a(Nanoc::Int::RuleMemoryActions::Snapshot)
+          expect(subject[0].snapshot_name).to eql(:raw)
+          expect(subject[0]).to be_final
+          expect(subject[0].path).to be_nil
 
-        expect(subject[2]).to be_a(Nanoc::Int::RuleMemoryActions::Filter)
-        expect(subject[2].filter_name).to eql(:erb)
-        expect(subject[2].params).to eql({ speed: :over_9000 })
+          expect(subject[1]).to be_a(Nanoc::Int::RuleMemoryActions::Snapshot)
+          expect(subject[1].snapshot_name).to eql(:pre)
+          expect(subject[1]).not_to be_final
+          expect(subject[1].path).to be_nil
 
-        expect(subject[3]).to be_a(Nanoc::Int::RuleMemoryActions::Snapshot)
-        expect(subject[3].snapshot_name).to eql(:pre)
-        expect(subject[3]).to be_final
-        expect(subject[3].path).to be_nil
+          expect(subject[2]).to be_a(Nanoc::Int::RuleMemoryActions::Filter)
+          expect(subject[2].filter_name).to eql(:erb)
+          expect(subject[2].params).to eql({ speed: :over_9000 })
 
-        expect(subject[4]).to be_a(Nanoc::Int::RuleMemoryActions::Layout)
-        expect(subject[4].layout_identifier).to eql('/default.*')
-        expect(subject[4].params).to be_nil
+          expect(subject[3]).to be_a(Nanoc::Int::RuleMemoryActions::Snapshot)
+          expect(subject[3].snapshot_name).to eql(:pre)
+          expect(subject[3]).to be_final
+          expect(subject[3].path).to be_nil
 
-        expect(subject[5]).to be_a(Nanoc::Int::RuleMemoryActions::Filter)
-        expect(subject[5].filter_name).to eql(:typohero)
-        expect(subject[5].params).to eql({})
+          expect(subject[4]).to be_a(Nanoc::Int::RuleMemoryActions::Layout)
+          expect(subject[4].layout_identifier).to eql('/default.*')
+          expect(subject[4].params).to be_nil
 
-        expect(subject[6]).to be_a(Nanoc::Int::RuleMemoryActions::Snapshot)
-        expect(subject[6].snapshot_name).to eql(:post)
-        expect(subject[6]).to be_final
-        expect(subject[6].path).to be_nil
+          expect(subject[5]).to be_a(Nanoc::Int::RuleMemoryActions::Filter)
+          expect(subject[5].filter_name).to eql(:typohero)
+          expect(subject[5].params).to eql({})
 
-        expect(subject[7]).to be_a(Nanoc::Int::RuleMemoryActions::Snapshot)
-        expect(subject[7].snapshot_name).to eql(:last)
-        expect(subject[7]).to be_final
-        expect(subject[7].path).to be_nil
+          expect(subject[6]).to be_a(Nanoc::Int::RuleMemoryActions::Snapshot)
+          expect(subject[6].snapshot_name).to eql(:post)
+          expect(subject[6]).to be_final
+          expect(subject[6].path).to be_nil
+
+          expect(subject[7]).to be_a(Nanoc::Int::RuleMemoryActions::Snapshot)
+          expect(subject[7].snapshot_name).to eql(:last)
+          expect(subject[7]).to be_final
+          expect(subject[7].path).to be_nil
+        end
       end
     end
 
@@ -81,8 +92,8 @@
 
       context 'no rules exist' do
         it 'raises error' do
-          expect { subject }.to raise_error(
-            Nanoc::RuleDSL::RuleMemoryCalculator::NoRuleMemoryForLayoutException)
+          error = Nanoc::RuleDSL::RuleMemoryCalculator::NoRuleMemoryForLayoutException
+          expect { subject }.to raise_error(error)
         end
       end
 
@@ -105,7 +116,8 @@
       let(:obj) { :donkey }
 
       it 'errors' do
-        expect { subject }.to raise_error(Nanoc::RuleDSL::RuleMemoryCalculator::UnsupportedObjectTypeException)
+        error = Nanoc::RuleDSL::RuleMemoryCalculator::UnsupportedObjectTypeException
+        expect { subject }.to raise_error(error)
       end
     end
   end