Interface for expanding OP contents

app/assets/javascripts/discourse/controllers/topic_controller.js

@@ -216,10 +216,24 @@ Discourse.TopicController = Discourse.ObjectController.extend(Discourse.Selected
           }) + "\n\n" + q);
         });
       });
-    }
-
     },
 
+    expandFirstPost: function(post) {
+      var self = this;
+      this.set('loadingExpanded', true);
+      post.expand().then(function() {
+        self.set('firstPostExpanded', true);
+      }).finally(function() {
+        self.set('loadingExpanded', false);
+      });
+    }
+  },
+
+  showExpandButton: function() {
+    var post = this.get('post');
+    return post.get('post_number') === 1 && post.get('topic.expandable_first_post');
+  }.property(),
+
   slackRatio: function() {
     return Discourse.Capabilities.currentProp('slackRatio');
   }.property(),

app/assets/javascripts/discourse/models/post.js

@@ -176,6 +176,17 @@ Discourse.Post = Discourse.Model.extend({
     }
   },
 
+  /**
+    Expands the first post's content, if embedded and shortened.
+
+    @method expandFirstPost
+  **/
+  expand: function() {
+    var self = this;
+    return Discourse.ajax("/posts/" + this.get('id') + "/expand-embed").then(function(result) {
+      self.set('cooked', result.cooked);
+    });
+  },
 
   /**
     Recover a deleted post

app/assets/javascripts/discourse/templates/post.js.handlebars

@@ -74,6 +74,13 @@
           </div>
         {{/unless}}
         <div class='cooked'>{{{cooked}}}</div>
+        {{#if view.showExpandButton}}
+          {{#if controller.loadingExpanded}}
+            <button class="btn" disabled>{{i18n loading}}</button>
+          {{else}}
+            <button {{action expandFirstPost this}} class='btn'>{{i18n post.show_full}}</button>
+          {{/if}}
+        {{/if}}
         {{view Discourse.PostMenuView postBinding="this" postViewBinding="view"}}
       </div>
       {{view Discourse.RepliesView content=replies postView=view}}

app/assets/javascripts/discourse/views/post_view.js

@@ -27,6 +27,13 @@ Discourse.PostView = Discourse.GroupedView.extend(Ember.Evented, {
     }
   }.property('post.primary_group_name'),
 
+  showExpandButton: function() {
+    if (this.get('controller.firstPostExpanded')) { return false; }
+
+    var post = this.get('post');
+    return post.get('post_number') === 1 && post.get('topic.expandable_first_post');
+  }.property('post.post_number', 'controller.firstPostExpanded'),
+
   // If the cooked content changed, add the quote controls
   cookedChanged: function() {
     var self = this;

app/controllers/posts_controller.rb

@@ -143,6 +143,10 @@ class PostsController < ApplicationController
     render nothing: true
   end
 
+  def expand_embed
+    render json: {cooked: "NEW COOKED CONTENT"}
+  end
+
   def recover
     post = find_post_from_params
     guardian.ensure_can_recover_post!(post)

config/locales/client.en.yml

@@ -891,6 +891,7 @@ en:
       reply_as_new_topic: "Reply as new Topic"
       continue_discussion: "Continuing the discussion from {{postLink}}:"
       follow_quote: "go to the quoted post"
+      show_full: "Show Full Post"
       deleted_by_author:
         one: "(post withdrawn by author, will be automatically deleted in %{count} hour unless flagged)"
         other: "(post withdrawn by author, will be automatically deleted in %{count} hours unless flagged)"

config/routes.rb

@@ -335,6 +335,7 @@ Discourse::Application.routes.draw do
 
   post "t/:topic_id/notifications" => "topics#set_notifications" , constraints: {topic_id: /\d+/}
 
+  get "/posts/:id/expand-embed" => "posts#expand_embed"
   get "raw/:topic_id(/:post_number)" => "posts#markdown"
 
   resources :invites