Fix nested forbidden engine not being detected (#173)

Co-authored-by: Shane da Silva <shane@dasilva.io>

lib/slim_lint/linter/embedded_engines.rb

@@ -12,7 +12,7 @@ class Linter::EmbeddedEngines < Linter
       dummy_node = Struct.new(:line)
       document.source_lines.each_with_index do |line, index|
         forbidden_engines.each do |forbidden_engine|
-          next unless line =~ /^#{forbidden_engine}.*:\s*$/
+          next unless line =~ /^\s*#{forbidden_engine}.*:\s*$/
 
           report_lint(dummy_node.new(index + 1), MESSAGE % forbidden_engine)
         end

spec/slim_lint/linter/embedded_engines_spec.rb

@@ -41,4 +41,27 @@
     it { should report_lint line: 3 }
     it { should report_lint line: 6 }
   end
+
+  context 'when a file contains nested forbidden embedded engine' do
+    let(:config) do
+      { 'forbidden_engines' => %w[javascript css] }
+    end
+
+    let(:slim) { <<-SLIM }
+      html
+        head
+          javascript:
+            alert('foo')
+
+          css:
+            h1 {
+              font-size: 10px;
+            }
+        body
+          h1 Test
+    SLIM
+
+    it { should report_lint line: 3 }
+    it { should report_lint line: 6 }
+  end
 end