logout link and prevent people from entering in inline ruby code

app/helpers/helper_helper.rb

@@ -18,12 +18,8 @@ def extract_helper_options(params)
 
   def helper_invocation(prefix, params, suffix = ")")
     options = extract_helper_options(params)
-    '<%= ' + 
-    prefix + 
-    (', ' unless options.blank?).to_s + 
-    options.map {|e| ":#{e.first} => #{e.last}" }.join(', ') + 
-    suffix + 
-    ' %>'
+    invocation = '<%= ' + prefix + (', ' unless options.blank?).to_s + options.map {|e| ":#{e.first} => #{e.last}" }.join(', ') + suffix + ' %>'
+    invocation.gsub(/\#{.*?}/, '{SORRY}')
   end
 
 end

app/views/helper/_fb_logout_link.html.erb

@@ -0,0 +1,29 @@
+<% form_tag do %>
+
+  <b><%= @helper_name %>(</b>
+    <blockquote>
+      <%= text_field_tag :link_text, (params[:link_text] || 'Logout'), :title => "Clickable text for logout link" %>,
+      <br />
+      <%= text_field_tag :redirect_url, (params[:redirect_url] || request.url), :size => 70, :title => "URL to redirect to upon logout" %>
+      <br />
+    </blockquote>
+  <b>)</b>
+
+  <%= submit_tag 'Go' %>
+
+<% end %>
+
+
+<% if request.post? %>
+  <% invocation = helper_invocation("#{@helper_name}(\"#{params[:link_text]}\", \"#{h params[:redirect_url]}\"", {}) %>
+
+  <h3>Invocation</h3>
+  <div class='boxed'>
+    <%= h invocation %>
+  </div>
+
+  <h3>Result</h3>
+  <div class='boxed'>
+    <%= render :inline => invocation %>
+  </div>
+<% end %>

app/views/home/index.html.erb

@@ -32,6 +32,7 @@
     <li>
       <h2>Explore the links on the right.</h2>
       <p>The links to the right will let you play with the various Facebooker helper methods, see their invocation, and their output.</p>
+      <p>If an argument to a helper isn't named (ie. via a hash) and isn't clear from it's context, try hovering the mouse over it for a short description.</p>
     </li>
   </ol>
 </div>

config/application_config.yml

@@ -13,6 +13,11 @@ development: &defaults
       :description: Renders a Facebook Connect login button image on your site.
       :wiki_url: http://wiki.developers.facebook.com/index.php/Fb:login-button
       :not_in_fb: true
+    :fb_logout_link: 
+      :description: Log user out from this session and Facebook, then redirect to the specified url.
+      :wiki_url: http://wiki.developers.facebook.com/index.php/JS_API_M_FB.Connect.LogoutAndRedirect
+      :not_in_fb: true
+
 
 test:
   <<: *defaults

public/stylesheets/application.css

@@ -207,6 +207,11 @@ small, .small {
   font-family: "Monaco", "Courier New";
 }
 
+#helper form blockquote {
+  padding: 0;
+  margin: 0 0 0 1em;
+}
+
 #helper form label {
   width: 33%;
   display: inline-block;