refactor file+matter creation in cucumber steps

features/step_definitions/jekyll_steps.rb

@@ -1,3 +1,25 @@
+def file_content_from_hash(input_hash)
+  matter_hash = {}
+  %w(title layout tag tags category categories published author path date permalink).each do |key|
+    matter_hash[key] = input_hash[key] if input_hash[key]
+  end
+  matter = matter_hash.map { |k, v| "#{k}: #{v}\n" }.join.chomp
+
+  content = if input_hash['input'] && input_hash['filter']
+    "{{ #{input_hash['input']} | #{input_hash['filter']} }}"
+  else
+    input_hash['content']
+  end
+
+  <<EOF
+---
+#{matter}
+---
+#{content}
+EOF
+end
+
+
 Before do
   FileUtils.mkdir(TEST_DIR)
   Dir.chdir(TEST_DIR)
@@ -78,26 +100,8 @@ Given /^I have the following (draft|post)s?(?: (in|under) "([^"]+)")?:$/ do |sta
     end
 
     path = File.join(before, folder_post, after, filename)
-
-    matter_hash = {}
-    %w(title layout tag tags category categories published author path date permalink).each do |key|
-      matter_hash[key] = post[key] if post[key]
-    end
-    matter = matter_hash.map { |k, v| "#{k}: #{v}\n" }.join.chomp
-
-    content = if post['input'] && post['filter']
-      "{{ #{post['input']} | #{post['filter']} }}"
-    else
-      post['content']
-    end
-
     File.open(path, 'w') do |f|
-      f.write <<EOF
----
-#{matter}
----
-#{content}
-EOF
+      f.write file_content_from_hash(post)
     end
   end
 end