Implement scssify

README.md

@@ -6,6 +6,8 @@
 
 Gojekyll is a clone of the [Jekyll](https://jekyllrb.com) static site generator, written in the [Go](https://golang.org) programming language. It provides `build` and `serve` commands, with directory watch and live reload.
 
+Gojekyll is intended as an homage to Jekyll, and as a possible alternative in situations (such as iterative development of sites that don't use unsupported features) where speed is more important than total compatibility.
+
 |                    | Gojekyll                                  | Jekyll | Hugo         |
 |-------------------------|-------------------------------------------|--------|--------------|
 | Stable                  |                                           | ✓      | ✓            |
@@ -86,8 +88,7 @@ Missing features:
 - Pagination
 - Math
 - Plugin system. ([Some plugins](./docs/plugins.md) are emulated.)
-- Liquid tag `tablerow`.
-- Liquid filter `scssify`
+- Liquid filter `sassify`
 - Markdown features: [attribute lists](https://kramdown.gettalong.org/syntax.html#attribute-list-definitions), [`markdown=1`](https://kramdown.gettalong.org/syntax.html#html-blocks).
 - `site.data` is not sorted.
 - Undefined Liquid tags and filters are errors, not warnings.

filters/filters.go

@@ -18,6 +18,7 @@ import (
 	"github.com/osteele/liquid/evaluator"
 	"github.com/osteele/liquid/expressions"
 	"github.com/russross/blackfriday"
+	libsass "github.com/wellington/go-libsass"
 )
 
 // AddJekyllFilters adds the Jekyll filters to the Liquid engine.
@@ -118,7 +119,8 @@ func AddJekyllFilters(e *liquid.Engine, c *config.Config) {
 
 	// string escapes
 	e.RegisterFilter("cgi_escape", url.QueryEscape)
-	e.RegisterFilter("scssify", unimplementedFilter("scssify"))
+	e.RegisterFilter("sassify", unimplementedFilter("sassify"))
+	e.RegisterFilter("scssify", scssifyFilter)
 	e.RegisterFilter("smartify", smartifyFilter)
 	e.RegisterFilter("uri_escape", func(s string) string {
 		return regexp.MustCompile(`\?(.+?)=([^&]*)(?:\&(.+?)=([^&]*))*`).ReplaceAllStringFunc(s, func(m string) string {
@@ -281,3 +283,21 @@ func whereFilter(array []map[string]interface{}, key string, value interface{})
 	}
 	return result
 }
+
+// string filters
+
+func scssifyFilter(s string) (string, error) {
+	// this doesn't try to share context or setup with the rendering pipeline,
+	// and it doesn't minify
+	buf := new(bytes.Buffer)
+	comp, err := libsass.New(buf, bytes.NewBufferString(s))
+	if err != nil {
+		return "", err
+	}
+	// err = comp.Option(libsass.WithSyntax(libsass.SassSyntax))
+	if err != nil {
+		return "", err
+	}
+	err = comp.Run()
+	return buf.String(), err
+}

filters/filters_test.go

@@ -62,6 +62,9 @@ var filterTests = []struct{ in, expected string }{
 	{`{{ "The _config.yml file" | slugify: 'default' }}`, "the-config-yml-file"},
 	{`{{ "The _config.yml file" | slugify: 'pretty' }}`, "the-_config.yml-file"},
 
+	// {`{{ "nav\n\tmargin: 0" | sassify }}`, "nav {\n  margin: 0; }"},
+	{`{{ "nav {margin: 0}" | scssify }}`, "nav {\n  margin: 0; }"},
+
 	{`{{ "smartify single 'quotes' here" | smartify }}`, "smartify single ‘quotes’ here"},
 	{`{{ 'smartify double "quotes" here' | smartify }}`, "smartify double “quotes” here"},
 	{"{{ \"smartify ``backticks''\" | smartify }}", "smartify “backticks”"},