Update to LibSass v3.6.3

Fixes #6862

resources/resource_transformers/tocss/scss/client_extended.go

@@ -0,0 +1,58 @@
+// Copyright 2018 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build extended
+
+package scss
+
+import (
+	"github.com/bep/golibsass/libsass"
+	"github.com/gohugoio/hugo/resources"
+	"github.com/gohugoio/hugo/resources/internal"
+	"github.com/gohugoio/hugo/resources/resource"
+)
+
+type options struct {
+	// The options we receive from the end user.
+	from Options
+
+	// The options we send to the SCSS library.
+	to libsass.Options
+}
+
+func (c *Client) ToCSS(res resources.ResourceTransformer, opts Options) (resource.Resource, error) {
+	internalOptions := options{
+		from: opts,
+	}
+
+	// Transfer values from client.
+	internalOptions.to.Precision = opts.Precision
+	internalOptions.to.OutputStyle = libsass.ParseOutputStyle(opts.OutputStyle)
+
+	if internalOptions.to.Precision == 0 {
+		// bootstrap-sass requires 8 digits precision. The libsass default is 5.
+		// https://github.com/twbs/bootstrap-sass/blob/master/README.md#sass-number-precision
+		internalOptions.to.Precision = 8
+	}
+
+	return res.Transform(&toCSSTransformation{c: c, options: internalOptions})
+}
+
+type toCSSTransformation struct {
+	c       *Client
+	options options
+}
+
+func (t *toCSSTransformation) Key() internal.ResourceTransformationKey {
+	return internal.NewResourceTransformationKey(transformationName, t.options.from)
+}