Merge pull request #658 from Shopify/url_decode-filter

Merge pull request 658

lib/liquid/standardfilters.rb

@@ -45,6 +45,10 @@ module Liquid
       CGI.escape(input) unless input.nil?
     end
 
+    def url_decode(input)
+      CGI.unescape(input) unless input.nil?
+    end
+
     def slice(input, offset, length = nil)
       offset = Utils.to_integer(offset)
       length = length ? Utils.to_integer(length) : 1

test/integration/standard_filter_test.rb

@@ -130,6 +130,13 @@ class StandardFiltersTest < Minitest::Test
     assert_equal nil, @filters.url_encode(nil)
   end
 
+  def test_url_decode
+    assert_equal 'foo bar', @filters.url_decode('foo+bar')
+    assert_equal 'foo bar', @filters.url_decode('foo%20bar')
+    assert_equal '[email protected]', @filters.url_decode('foo%2B1%40example.com')
+    assert_equal nil, @filters.url_decode(nil)
+  end
+
   def test_truncatewords
     assert_equal 'one two three', @filters.truncatewords('one two three', 4)
     assert_equal 'one two...', @filters.truncatewords('one two three', 2)