From d9d4735c64af7394112a6121084b48a959103659 Mon Sep 17 00:00:00 2001
From: Test User <steele@osteele.com>
Date: Sun, 23 Nov 2025 07:47:30 +0800
Subject: [PATCH] feat: Implement sassify filter for indented Sass syntax

Adds support for the `sassify` Liquid filter to convert indented Sass
syntax to CSS, complementing the existing `scssify` filter.

Implementation:
- Added sassifyFilter function using Dart Sass with SourceSyntaxSASS
- Reuses existing Sass transpiler singleton for efficiency
- Removed now-unused unimplementedFilter helper and logger import
- Added test case with proper indented Sass syntax
- Updated README to remove sassify from missing features list

Addresses #10
---
 README.md               |  1 -
 filters/filters.go      | 27 +++++++++++++--------------
 filters/filters_test.go |  3 ++-
 3 files changed, 15 insertions(+), 16 deletions(-)

diff --git a/README.md b/README.md
index 822cd734..2c7c6151 100644
--- a/README.md
+++ b/README.md
@@ -120,7 +120,6 @@ Missing features:
 - Pagination
 - Math
 - Plugin system. ([Some individual plugins](./docs/plugins.md) are emulated.)
-- Liquid filter `sassify` is not implemented
 - Liquid is run in strict mode: undefined filters and variables are errors.
 - Missing markdown features:
   - [attribute lists](https://kramdown.gettalong.org/syntax.html#attribute-list-definitions)
diff --git a/filters/filters.go b/filters/filters.go
index 20b96006..b506bb92 100644
--- a/filters/filters.go
+++ b/filters/filters.go
@@ -17,7 +17,6 @@ import (
 	blackfriday "github.com/danog/blackfriday/v2"
 	"github.com/osteele/gojekyll/config"
 	"github.com/osteele/gojekyll/internal/sasserrors"
-	"github.com/osteele/gojekyll/logger"
 	"github.com/osteele/gojekyll/utils"
 	"github.com/osteele/liquid"
 	"github.com/osteele/liquid/evaluator"
@@ -122,7 +121,7 @@ func AddJekyllFilters(e *liquid.Engine, c *config.Config) {
 
 	// string escapes
 	e.RegisterFilter("cgi_escape", url.QueryEscape)
-	e.RegisterFilter("sassify", unimplementedFilter("sassify"))
+	e.RegisterFilter("sassify", sassifyFilter)
 	e.RegisterFilter("scssify", scssifyFilter)
 	e.RegisterFilter("smartify", smartifyFilter)
 	e.RegisterFilter("uri_escape", func(s string) string {
@@ -154,18 +153,6 @@ func requireNonEmptyArray(fn func([]interface{}) interface{}) func([]interface{}
 	}
 }
 
-func unimplementedFilter(name string) func(value interface{}) interface{} {
-	warned := false
-	log := logger.Default()
-	return func(value interface{}) interface{} {
-		if !warned {
-			log.Warn("unimplemented filter: %s", name)
-			warned = true
-		}
-		return value
-	}
-}
-
 // array filters
 
 func arrayToSentenceStringFilter(array []string, conjunction func(string) string) string {
@@ -308,6 +295,18 @@ func getScssifyTranspiler() (*sass.Transpiler, error) {
 	return scssifyTranspiler, scssifyTranspilerErr
 }
 
+func sassifyFilter(s string) (string, error) {
+	comp, err := getScssifyTranspiler()
+	if err != nil {
+		return "", err
+	}
+	res, err := comp.Execute(sass.Args{
+		Source:       s,
+		SourceSyntax: sass.SourceSyntaxSASS,
+	})
+	return res.CSS, err
+}
+
 func scssifyFilter(s string) (string, error) {
 	comp, err := getScssifyTranspiler()
 	if err != nil {
diff --git a/filters/filters_test.go b/filters/filters_test.go
index acd24c91..8972acfb 100644
--- a/filters/filters_test.go
+++ b/filters/filters_test.go
@@ -60,7 +60,7 @@ 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; }"},
+	{`{{ sass_code | sassify }}`, "nav {\n  margin: 0;\n}"},
 	{`{{ "nav {margin: 0}" | scssify }}`, "nav {\n  margin: 0;\n}"},
 
 	{`{{ "smartify single 'quotes' here" | smartify }}`, "smartify single ‘quotes’ here"},
@@ -86,6 +86,7 @@ var filterTestBindings = liquid.Bindings{
 	"page": map[string]interface{}{
 		"tags": []string{"Seattle", "Tacoma"},
 	},
+	"sass_code": "nav\n  margin: 0",
 	"site": map[string]interface{}{
 		"members": []map[string]interface{}{
 			{"name": "Alonzo", "graduation_year": 2013},