Get meta keys from config, if defined

source/scripts/controllers/comparison.js.coffee

@@ -30,7 +30,7 @@ angular.module("sideBySide").controller "ComparisonController",
 		headingKey = poems.config.heading or "Author"
 		$scope.headings = (version[headingKey] for version in transformed.meta)
 
-		$scope.metaKeys = poems.getMetaKeys()
+		$scope.metaKeys = poems.config.metaKeys or poems.getMetaKeys()
 		$scope.all = poems.all
 		scroll()
 

source/tests/the_raven/config.json

@@ -19,5 +19,6 @@
 		"1910-barbara-beaupre.md",
 		"1970-baranczak.md"
 	],
-	"display": { "Language": [ "cs" ] }
+	"display": { "Language": [ "cs" ] },
+	"metaKeys": [ "Author", "Title", "Year", "Language" ]
 }