Add Configuration#dig() and ConfigView#dig()

lib/nanoc/base/entities/configuration.rb

@@ -96,6 +96,11 @@ def [](key)
       @wrapped[key]
     end
 
+    contract C::Args[C::Any] => C::Any
+    def dig(*keys)
+      @wrapped.dig(*keys)
+    end
+
     contract C::Any, C::Maybe[C::Any], C::Maybe[C::Func[C::None => C::Any]] => C::Any
     def fetch(key, fallback = NONE, &_block)
       @wrapped.fetch(key) do

lib/nanoc/base/views/config_view.rb

@@ -47,5 +47,11 @@ def each(&block)
       @context.dependency_tracker.bounce(unwrap, attributes: true)
       @config.each(&block)
     end
+
+    # @see Hash#dig
+    def dig(*keys)
+      @context.dependency_tracker.bounce(unwrap, attributes: keys)
+      @config.dig(*keys)
+    end
   end
 end

spec/nanoc/base/views/config_view_spec.rb

@@ -5,7 +5,7 @@
     Nanoc::Int::Configuration.new(hash: hash)
   end
 
-  let(:hash) { { amount: 9000, animal: 'donkey' } }
+  let(:hash) { { amount: 9000, animal: 'donkey', foo: { bar: :baz } } }
 
   let(:view) { described_class.new(config, view_context) }
 
@@ -41,12 +41,12 @@
       expect(dependency_tracker).to receive(:bounce).with(config, attributes: [key])
     end
 
-    context 'with existant key' do
+    context 'with existing key' do
       let(:key) { :animal }
       it { is_expected.to eql('donkey') }
     end
 
-    context 'with non-existant key' do
+    context 'with non-existing key' do
       let(:key) { :weapon }
       it { is_expected.to eql(nil) }
     end
@@ -57,15 +57,15 @@
       expect(dependency_tracker).to receive(:bounce).with(config, attributes: [key])
     end
 
-    context 'with existant key' do
+    context 'with existing key' do
       let(:key) { :animal }
 
       subject { view.fetch(key) }
 
       it { is_expected.to eql('donkey') }
     end
 
-    context 'with non-existant key' do
+    context 'with non-existing key' do
       let(:key) { :weapon }
 
       context 'with fallback' do
@@ -95,12 +95,12 @@
       expect(dependency_tracker).to receive(:bounce).with(config, attributes: [key])
     end
 
-    context 'with existant key' do
+    context 'with existing key' do
       let(:key) { :animal }
       it { is_expected.to eql(true) }
     end
 
-    context 'with non-existant key' do
+    context 'with non-existing key' do
       let(:key) { :weapon }
       it { is_expected.to eql(false) }
     end
@@ -115,7 +115,25 @@
       res = []
       view.each { |k, v| res << [k, v] }
 
-      expect(res).to eql([[:amount, 9000], [:animal, 'donkey']])
+      expect(res).to eql([[:amount, 9000], [:animal, 'donkey'], [:foo, { bar: :baz }]])
+    end
+  end
+
+  describe '#dig' do
+    subject { view.dig(*keys) }
+
+    before do
+      expect(dependency_tracker).to receive(:bounce).with(config, attributes: keys)
+    end
+
+    context 'with existing keys' do
+      let(:keys) { %i[foo bar] }
+      it { is_expected.to eql(:baz) }
+    end
+
+    context 'with non-existing keys' do
+      let(:keys) { %i[foo baz bar] }
+      it { is_expected.to eql(nil) }
     end
   end