Added UrlHelper#link_to_if/link_to_unless to enable other conditions that just link_to_unless_current #757 [mindel]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@852 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* Added UrlHelper#link_to_if/link_to_unless to enable other conditions that just link_to_unless_current #757 [mindel]
+
 * Fixed that single quote was not escaped in a UrlHelper#link_to javascript confirm #549 [Scott Barron]
 
 * Removed the default border on link_image_to (it broke xhtml strict) -- can be specified with :border => 0 #517 [?/caleb]

actionpack/lib/action_view/helpers/url_helper.rb

@@ -86,14 +86,28 @@ module ActionView
       # request uri is the same as the link's, in which case only the name is returned (or the
       # given block is yielded, if one exists). This is useful for creating link bars where you don't want to link
       # to the page currently being viewed.
-      def link_to_unless_current(name, options = {}, html_options = {}, *parameters_for_method_reference)
-        if current_page?(options)
-          block_given? ?
-            yield(name, options, html_options, *parameters_for_method_reference) :
+      def link_to_unless_current(name, options = {}, html_options = {}, *parameters_for_method_reference, &block)
+        link_to_unless current_page?(options), name, options, html_options, *parameters_for_method_reference, &block
+      end
+
+      # Create a link tag of the given +name+ using an URL created by the set of +options+, unless +condition+
+      # is true, in which case only the name is returned (or the given block is yielded, if one exists). 
+      def link_to_unless(condition, name, options = {}, html_options = {}, *parameters_for_method_reference, &block)
+        if condition
+          if block_given?
+            block.arity <= 1 ? yield(name) : yield(name, options, html_options, *parameters_for_method_reference)
+          else
             html_escape(name)
+          end
         else
           link_to(name, options, html_options, *parameters_for_method_reference)
-        end
+        end  
+      end
+      
+      # Create a link tag of the given +name+ using an URL created by the set of +options+, if +condition+
+      # is true, in which case only the name is returned (or the given block is yielded, if one exists). 
+      def link_to_if(condition, name, options = {}, html_options = {}, *parameters_for_method_reference, &block)
+        link_to_unless !condition, name, options, html_options, *parameters_for_method_reference, &block
       end
 
       # Creates a link tag for starting an email to the specified <tt>email_address</tt>, which is also used as the name of the

actionpack/test/template/url_helper_test.rb

@@ -50,6 +50,28 @@ class UrlHelperTest < Test::Unit::TestCase
                  link_image_to("rss.gif", "http://www.example.com", :size => "30x45", :alt => "Feed", :class => "admin")
   end
 
+  def test_link_to_unless
+    assert_equal "Showing", link_to_unless(true, "Showing", :action => "show", :controller => "weblog")
+    assert "<a href=\"http://www.example.com\">Listing</a>", link_to_unless(false, "Listing", :action => "list", :controller => "weblog")
+    assert_equal "Showing", link_to_unless(true, "Showing", :action => "show", :controller => "weblog", :id => 1)
+    assert_equal "<strong>Showing</strong>", link_to_unless(true, "Showing", :action => "show", :controller => "weblog", :id => 1) { |name, options, html_options, *parameters_for_method_reference|
+      "<strong>#{name}</strong>"
+    }
+    assert_equal "<strong>Showing</strong>", link_to_unless(true, "Showing", :action => "show", :controller => "weblog", :id => 1) { |name|
+      "<strong>#{name}</strong>"
+    }    
+    assert_equal "test", link_to_unless(true, "Showing", :action => "show", :controller => "weblog", :id => 1) {
+      "test"
+    }    
+  end
+  
+  def test_link_to_if
+    assert_equal "Showing", link_to_if(false, "Showing", :action => "show", :controller => "weblog")
+    assert "<a href=\"http://www.example.com\">Listing</a>", link_to_if(true, "Listing", :action => "list", :controller => "weblog")
+    assert_equal "Showing", link_to_if(false, "Showing", :action => "show", :controller => "weblog", :id => 1)
+  end
+
+
   def test_link_unless_current
     @request = RequestMock.new("http://www.example.com")
     assert_equal "Showing", link_to_unless_current("Showing", :action => "show", :controller => "weblog")