Add the url_encode filter (#50)

twig/filter/filter.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"math"
+	"net/url"
 	"sort"
 	"strings"
 	"unicode/utf8"
@@ -503,6 +504,5 @@ func filterUpper(ctx stick.Context, val stick.Value, args ...stick.Value) stick.
 }
 
 func filterURLEncode(ctx stick.Context, val stick.Value, args ...stick.Value) stick.Value {
-	// TODO: Implement Me
-	return val
+	return url.QueryEscape(stick.CoerceString(val))
 }

twig/filter/filter_test.go

@@ -129,6 +129,7 @@ func TestFilters(t *testing.T) {
 				return
 			},
 		},
+		{"urlencode", func() stick.Value { return filterURLEncode(nil, "http://test.com/dude?sweet=33&1=2") }, "http%3A%2F%2Ftest.com%2Fdude%3Fsweet%3D33%261%3D2"},
 	}
 	for _, test := range tests {
 		matches := false