FEATURE: custom html and text can be added to summary emails

app/views/user_notifications/digest.html.erb

@@ -1,5 +1,10 @@
 <table style="border: 20px solid #eee;" cellspacing="0" cellpadding="0">
 <tr>
+  <%- if I18n.t('user_notifications.digest.custom.html.header').present? %>
+  <td style="padding: 10px 10px;">
+    <%= raw(t 'user_notifications.digest.custom.html.header') %>
+  </td>
+  <%- else %>
   <td style="padding: 10px 10px; background-color: #<%= @header_color %>;">
     <a href="<%= Discourse.base_url %>" style='color: #<%= @anchor_color %>'>
     <%- if logo_url.blank? %>
@@ -9,6 +14,7 @@
     <%- end %>
     </a>
   </td>
+  <%- end %>
 </tr>
 <tr>
   <td style="background-color: #fff; padding: 10px 10px; font-family: Arial, Helvetica, sans-serif; font-size: 14px;">
@@ -32,11 +38,15 @@
           </div>
         <%- end %>
 
+        <%= digest_custom_html("below_post_#{i+1}") %>
+
         <%- if i < @featured_topics.size - 1 %><% end %>
 
       <%- end %>
     <%- end %>
 
+    <%= digest_custom_html("above_popular_topics") %>
+
     <%- if @new_topics.present? %>
       <hr/>
       <h3><%=t 'user_notifications.digest.other_new_topics' %></h3>
@@ -53,6 +63,8 @@
 
     <%- end -%>
 
+    <%= digest_custom_html("below_popular_topics") %>
+
     <%- if @new_topics_since_seen > 0 %>
       <%- if @new_by_category.present? %>
         <p><%= t('user_notifications.digest.more_topics_category', last_seen_at: @last_seen_at, new_topics_since_seen: @new_topics_since_seen) %></p>
@@ -71,8 +83,12 @@
 </tr>
 </table>
 
+<%= digest_custom_html("above_footer") %>
+
 <div class='footer'>
   <%=raw(t 'user_notifications.digest.unsubscribe',
            site_link: html_site_link(@anchor_color),
            unsubscribe_link: link_to(t('user_notifications.digest.click_here'), email_unsubscribe_url(host: Discourse.base_url_no_prefix, key: @unsubscribe_key), {:style=>"color: ##{@anchor_color}"}))  %>
 </div>
+
+<%= digest_custom_html("below_footer") %>

app/views/user_notifications/digest.text.erb

@@ -6,7 +6,7 @@
 <%- if @featured_topics.present? %>
 ### <%=t 'user_notifications.digest.top_topics' %>
 
-<%- @featured_topics.each do |t| %>
+<%- @featured_topics.each_with_index do |t,i| %>
 <%= raw(@markdown_linker.create(t.title, t.relative_url)) %>
 
 <%- if t.best_post.present? %>
@@ -14,10 +14,10 @@
 --------------------------------------------------------------------------------
 
 <%- end %>
-
+<%= digest_custom_text("below_post_#{i+1}") %>
 <%- end %>
 <%- end %>
-
+<%= digest_custom_text("above_popular_topics") %>
 <%- if @new_topics.present? %>
 **<%=t 'user_notifications.digest.other_new_topics' %>**
 
@@ -27,12 +27,15 @@
 
 <%- end -%>
 
-
+<%= digest_custom_text("below_popular_topics") %>
 
 <%= raw(@markdown_linker.references) %>
 
+<%= digest_custom_text("above_footer") %>
 <%=raw(t :'user_notifications.digest.unsubscribe',
      site_link: site_link,
      unsubscribe_link: raw(@markdown_linker.create(t('user_notifications.digest.click_here'), email_unsubscribe_url(key: @unsubscribe_key, only_path: true))))  %>
 
 <%= raw(@markdown_linker.references) %>
+
+<%= digest_custom_text("below_footer") %>