add metadata field for canonical url

src/Main.hs

@@ -101,16 +101,19 @@ postCtx =
     dateField "date" "%B %e, %Y" <>
     constField "active-blog" "y" <>
     ertField "ert"               <>
-    metaKeywordCtx               <>
+    metaKeywordsCtx              <>
+    canonicalUrlCtx              <>
     defaultContext
 
 
-metaKeywordCtx :: Context String
-metaKeywordCtx = field "metaKeywords" $ \item -> do
-    tags <- getMetadataField (itemIdentifier item) "tags"
-    return $ maybe "" showMetaTags tags
-    where
-        showMetaTags t = "<meta name=\"keywords\" content=\"" ++ t ++ "\"/>\n"
+metaKeywordsCtx :: Context String
+metaKeywordsCtx = field "meta-keywords" $ \item -> do
+    getMetadataField' (itemIdentifier item) "tags"
+
+
+canonicalUrlCtx :: Context String
+canonicalUrlCtx = field "canonical-url" $ \item -> do
+    getMetadataField' (itemIdentifier item) "canonical-url"
 
 
 -- estimated reading time

src/templates/default.html

@@ -6,7 +6,11 @@
     <meta name="description" content="" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
     <meta name="author" content="Tomáš Zemanovič" />
-    $if(metaKeywords)$ $metaKeywords$ $endif$
+    $if(meta-keywords)$
+    <meta name="keywords" content="$meta-keywords$" />
+    $endif$ $if(canonical-url)$
+    <link rel="canonical" href="$canonical-url$" />
+    $endif$
     <meta name="theme-color" content="#10151f" />
     <meta
       name="google-site-verification"

src/templates/post.html

@@ -14,7 +14,11 @@
     $ert$
   </div>
 </div>
-<div id="post-body" class="pure-u">$body$</div>
+<div id="post-body" class="pure-u">
+  $if(canonical-url)$
+  <em>Originally posted at <a href="$canonical-url$">$canonical-url$</a>.</em
+  ><br />$endif$ $body$
+</div>
 <div id="post-footer" class="social-share tooltips">
   <a href="/" title="back"><i class="fas fa-arrow-circle-left"></i> back</a>
   <a

src/tzemanovic.cabal

 name:                tzemanovic
-version:             1.0.0.0
+version:             1.0.1.0
 synopsis:            Blog website
 description:         Please see README.md
 homepage:            https://gitlab.com/tzemanovic/tzemanovic.gitlab.io