Add block support for the helper

actionpack/CHANGELOG.md

@@ -1,5 +1,9 @@
 ## Rails 4.0.0 (unreleased) ##
 
+*   Add block support for the `mail_to` helper, similar to the `link_to` helper.
+
+    *Sam Pohlenz*
+
 *   Automatically configure cookie-based sessions to be encrypted if
     `secret_key_base` is set, falling back to signed if only `secret_token`
     is set. Automatically upgrade existing signed cookie-based sessions from

actionpack/lib/action_view/helpers/url_helper.rb

@@ -439,18 +439,29 @@ def link_to_if(condition, name, options = {}, html_options = {}, &block)
       #   mail_to "me@domain.com", "My email", cc: "ccaddress@domain.com",
       #            subject: "This is an example email"
       #   # => <a href="mailto:me@domain.com?cc=ccaddress@domain.com&subject=This%20is%20an%20example%20email">My email</a>
-      def mail_to(email_address, name = nil, html_options = {})
-        email_address = ERB::Util.html_escape(email_address)
-
+      #
+      # You can use a block as well if your link target is hard to fit into the name parameter. ERB example:
+      #
+      #   <%= mail_to "me@domain.com" do %>
+      #     <strong>Email me:</strong> <span>me@domain.com</span>
+      #   <% end %>
+      #   # => <a href="mailto:me@domain.com">
+      #          <strong>Email me:</strong> <span>me@domain.com</span>
+      #        </a>
+      def mail_to(email_address, name = nil, html_options = {}, &block)
+        html_options, name = name, nil if block_given?
+        html_options ||= {}
         html_options.stringify_keys!
 
+        email_address = ERB::Util.html_escape(email_address)
+
         extras = %w{ cc bcc body subject }.map { |item|
           option = html_options.delete(item) || next
           "#{item}=#{Rack::Utils.escape_path(option)}"
         }.compact
         extras = extras.empty? ? '' : '?' + ERB::Util.html_escape(extras.join('&'))
-        
-        content_tag "a", name || email_address.html_safe, html_options.merge("href" => "mailto:#{email_address}#{extras}".html_safe)
+
+        content_tag(:a, name || email_address.html_safe, html_options.merge("href" => "mailto:#{email_address}#{extras}".html_safe), &block)
       end
 
       # True if the current request URI was generated by the given +options+.

actionpack/test/template/url_helper_test.rb

@@ -538,6 +538,16 @@ def test_mail_to_returns_html_safe_string
     assert mail_to("david@loudthinking.com").html_safe?
   end
 
+  def test_mail_to_with_block
+    assert_dom_equal %{<a href="mailto:me@example.com"><span>Email me</span></a>},
+      mail_to('me@example.com') { content_tag(:span, 'Email me') }
+  end
+
+  def test_link_tag_with_block_and_options
+    assert_dom_equal %{<a class="special" href="mailto:me@example.com?cc=ccaddress%40example.com"><span>Email me</span></a>},
+      mail_to('me@example.com', cc: "ccaddress@example.com", class: "special") { content_tag(:span, 'Email me') }
+  end
+
   def protect_against_forgery?
     self.request_forgery
   end