Open graph tag generation for posts

lib/Atom.rakumod

@@ -2,25 +2,15 @@ use v6.e.PREVIEW;
 
 use DB::Post;
 use DB::BlogMeta;
+use Render::Util;
 
 use XML;
 
 unit module Atom;
 
-# get the link for a post
-sub post-link(BlogMeta:D $meta, Int:D $id, Post:D $post --> Str:D) {
-    my @slugs = $post.all-slugs;
-    my $base = $meta.get-base-url;
-    if @slugs.elems {
-       "$base/posts/by-slug/{@slugs[*-1]}.html"
-    } else {
-       "$base/posts/by-id/$id.html"
-    }
-}
-
 #| Convert a single post to an atom item
 sub post-to-item(BlogMeta:D $meta, Int:D $id, Post:D $post --> XML::Element) {
-    my $link = post-link $meta, $id, $post;
+    my $link = post-link-abs $meta, $id, $post;
     my $desc = $post.description;
     my $xml = XML::Element.new(:name<entry>);
     $xml.append:

lib/Config.rakumod

@@ -13,7 +13,18 @@ unit class Config;
 method generate-post(Int:D $id, Post:D $post, $db) {
     my $meta = $db.meta;
     my $content = $post.render-html;
-    my $head = generate-head($meta, $post.title, $post.description);
+    my $head =
+        head [
+            generate-head($meta, $post.title, $post.description);
+            meta :property<og:title>, :content($post.title);
+            meta :property<og:url>, :content(post-link-abs $db.meta, $id, $post);
+            meta :property<og:site_name>, :content($db.meta.title);
+            meta :property<og:type>, :content<article>;
+            meta :property<article:published_time>, :content($post.posted-at);
+            $post.tags.map(-> $tag {
+                                  meta :property<article:tag>, :content($tag)
+                              });
+        ];
     my $body =
     body [
        site-header $meta;
@@ -45,7 +56,7 @@ method generate-index($db) {
             generate-blurb $pair.key, $db
         });
 
-    my $head = generate-head($db.meta);
+    my $head = head [generate-head($db.meta);];
     my $body = body [
         site-header $db.meta;
         div :class<post-blurbs>, [
@@ -70,7 +81,7 @@ method generate-archive($db) {
             generate-blurb $pair.key, $db
         });
 
-    my $head = generate-head($db.meta);
+    my $head = head [generate-head($db.meta);];
     my $body = body [
         site-header $db.meta;
         div :class<post-blurbs>, [
@@ -128,7 +139,7 @@ method generate-tag-blurb($db, $tag, $limit?) {
 }
 
 method generate-tags-page($db, @tags) {
-    my $head = generate-head($db.meta);
+    my $head = head [generate-head($db.meta);];
     my $body = body [
         site-header $db.meta;
         div :class<tags>, [
@@ -146,7 +157,7 @@ method generate-tags-page($db, @tags) {
 }
 
 method generate-tag-page($db, $tag) {
-    my $head = generate-head($db.meta);
+    my $head = head [generate-head($db.meta);];
     my $body = body [
         site-header $db.meta;
         self.generate-tag-blurb($db, $tag, 4);

lib/Render/Head.rakumod

@@ -7,17 +7,18 @@ use Render::Util;
 use DB::BlogMeta;
 
 sub generate-head(BlogMeta:D $meta, $title?, $description?) is export {
-    head [
+    my $final-title = do if $title ~~ Str:D {
+        "$title — {$meta.title}"
+    } else {
+        $meta.title
+    };
+    [
         meta :charset<utf-8>;
         meta :name<viewport>, :content<width=device-width, initial-scale=1>;
         meta :author :content<Nathan McCarty>;
-        do if $title ~~ Str:D {
-            title "$title — {$meta.title}";
-        } else {
-            title $meta.title;
-        }
+        title $final-title;
         # Add description, if one exists
-        optl $description ~~ Str:D, -> {meta :description :content($description)};
+        optl $description ~~ Str:D, -> {meta :description :content(^ $description)};
         # Preconnect to all our resource sources
         link :rel<preconnect> :href<https://static.stranger.systems>;
         link :rel<preconnect> :href<https://fonts.googleapis.com>;

lib/Render/Series.rakumod

@@ -85,7 +85,7 @@ sub series-header(Series:D $series, $db) is export {
 sub series-page(Int:D $series-id, $db) is export {
     my $meta = $db.meta;
     my $series = $db.series{$series-id};
-    my $head = generate-head($meta, $series.title, $series.desc);
+    my $head = head [generate-head($meta, $series.title, $series.desc);];
     my $body =
     body [
         site-header $meta;
@@ -127,7 +127,7 @@ sub series-list-page($db) is export {
            series-blurb $id, $series, $db;
    }
 
-   my $head = generate-head($db.meta);
+   my $head = head [generate-head($db.meta);];
    my $body = body [
        site-header $db.meta;
        div :class<series-list>, [

lib/Render/Util.rakumod

@@ -2,6 +2,7 @@ use v6.e.PREVIEW;
 unit module Render::Util;
 
 use DB::Post;
+use DB::BlogMeta;
 
 use HTML::Functional;
 
@@ -68,3 +69,14 @@ sub intersperse (\element, +list) is export {
         take slip element, $_;
     }
 }
+
+# get the link for a post
+sub post-link-abs(BlogMeta:D $meta, Int:D $id, Post:D $post --> Str:D) is export {
+    my @slugs = $post.all-slugs;
+    my $base = $meta.get-base-url;
+    if @slugs.elems {
+       "$base/posts/by-slug/{@slugs[*-1]}.html"
+    } else {
+       "$base/posts/by-id/$id.html"
+    }
+}