Add fallback for unstructured Jamie Oliver recipes

Note: misses proper white-space handling.

services/jamie-oliver/properties/recipeInstructions.js

@@ -1,6 +1,41 @@
 const createQuerySelectorAll = require('utils/createQuerySelectorAll');
+const withFallback = require('utils/withFallback');
+const sanitizeHTML = require('sanitize-html');
 
-module.exports = createQuerySelectorAll(
+// Tested with: https://www.jamieoliver.com/news-and-features/features/make-roast-parsnips/
+const unstructuredRecipe = createQuerySelectorAll(
+  '.entry-content',
+  container => {
+    // Clean up some known noise element.
+    const galleries = container.querySelector('.galleries');
+    if (galleries) {
+      // Remove galleries and all nodes after the galleries.
+      while (galleries.nextSibling) {
+        galleries.nextSibling.parentNode.removeChild(galleries.nextSibling);
+      }
+      galleries.parentNode.removeChild(galleries);
+    }
+
+    const shareBar = container.querySelector('#share-bar-hz');
+    if (shareBar) {
+      shareBar.parentNode.removeChild(shareBar);
+    }
+
+    return sanitizeHTML(
+    	container.innerHTML
+        // Strip <p> tags
+	      .replace(/\<p.*?\>/gi, '')
+    	  // Replace </p> with <br>, will later be converted to \n in cleanup
+        .replace(/\<\/p\>/g, '<br>'),
+      {
+			  // Allow <br> tags, see above
+        allowedTags: ['br']
+		  }
+	  );
+  }
+);
+
+const structuredRecipe = createQuerySelectorAll(
   '.recipeSteps > li',
   instructions => {
     if (
@@ -15,3 +50,5 @@ module.exports = createQuerySelectorAll(
     return instructions.innerHTML;
   }
 );
+
+module.exports = withFallback(unstructuredRecipe)(structuredRecipe);

utils/withFallback.js

@@ -0,0 +1,8 @@
+/**
+ * Higher-order function, creating a function that will execute its given fallback in case it yields
+ * no results.
+ */
+module.exports = fallbackFn => primaryFn => (...args) => {
+  const result = primaryFn(...args);
+  return result.length ? result : fallbackFn(...args);
+};