Add support for embedded vimeo

app/assets/stylesheets/site/embedded-media.css.sass

@@ -35,6 +35,11 @@
     display: block
     margin: 0 auto
 
+.embedded-vimeo
+  iframe
+    display: block
+    margin: 0 auto
+
 .embedded-poll
   padding: 10px 15px
   max-width: 200px

app/models/post/embedded_media/vimeo_tag.rb

@@ -0,0 +1,34 @@
+class Post
+  class EmbeddedMedia
+    class VimeoTag < EmbeddedMedia::Tag
+
+      def initialize(_embedded_media, vimeo_id)
+        @vimeo_id = vimeo_id
+      end
+
+      def self.parse_url(url)
+        return nil unless url =~ %r[^https?://(?:www\.)?vimeo\.com/]
+        # https://stackoverflow.com/questions/13286785/get-video-id-from-vimeo-url/13286930#13286930
+        vimeo_id = /^.*(?:vimeo.com)\/(?:channels\/|channels\/\w+\/|groups\/[^\/]*\/videos\/|video\/|album\/\d+\/video\/|)(\d+)(?:$|\/|\?)/.match(url)[1]
+        self.new(Post::EmbeddedMedia, vimeo_id)
+      end
+
+      def to_html
+        content_tag(
+          :iframe,
+          nil,
+          frameborder: 0,
+          allowfullscreen: true,
+          width: 606,
+          height: 455,
+          src: "//player.vimeo.com/video/#{@vimeo_id}",
+          allowfullscreen: ''
+        )
+      end
+
+      def to_s
+        "{{Vimeo:#{@vimeo_id}}}"
+      end
+    end
+  end
+end