Working now

template/interpolate/funcs.go

@@ -257,14 +257,14 @@ func funcGenVault(ctx *Context) interface{} {
 }
 
 func funcGenSed(ctx *Context) interface{} {
-	return func(k string, expr string) (string, error) {
-		engine, err := sed.NewQuiet(strings.NewReader(expr))
+	return func(inputString string, expression string) (string, error) {
+		engine, err := sed.New(strings.NewReader(expression))
 
 		if err != nil {
 			return "", err
 		}
 
-		result, err := engine.RunString(k)
+		result, err := engine.RunString(inputString)
 
 		return result, err
 	}

template/interpolate/funcs_test.go

@@ -322,17 +322,17 @@ func TestFuncSed(t *testing.T) {
 		Output string
 	}{
 		{
-			`{{sed "hello" "s/hello/world/"}}`,
+			`{{sed "hello" "s|hello|world|"}}`,
 			`world`,
 		},
 
 		{
-			`{{sed "hello" "s/foo/bar/"}}`,
+			`{{sed "hello" "s|foo|bar|"}}`,
 			`hello`,
 		},
 
 		{
-			`{{user "foo" | sed "s/foo/bar/"}}`,
+			`{{user "foo" | sed "s|foo|bar|"}}`,
 			`bar`,
 		},
 	}