dartsass: Enable deprecation, @warn and @debug logging

* @warn and Sass deprecations are printed as WARN
* @debug is currently logged as INFO (needs the `--verbose` flag). We may adjust this if it gets too chatty.

Fixes #9683

6 files changed, 66 insertions, 12 deletions

diff --git a/go.mod b/go.mod
index 9a5e1179e..b797586be 100644
--- a/go.mod
+++ b/go.mod
@@ -9,7 +9,7 @@ require (
 	github.com/bep/debounce v1.2.0
 	github.com/bep/gitmap v1.1.2
 	github.com/bep/goat v0.5.0
-	github.com/bep/godartsass v0.12.0
+	github.com/bep/godartsass v0.14.0
 	github.com/bep/golibsass v1.0.0
 	github.com/bep/gowebp v0.1.0
 	github.com/bep/tmc v0.5.1
diff --git a/go.sum b/go.sum
index 1027742c1..545ba1085 100644
--- a/go.sum
+++ b/go.sum
@@ -140,8 +140,8 @@ github.com/bep/gitmap v1.1.2 h1:zk04w1qc1COTZPPYWDQHvns3y1afOsdRfraFQ3qI840=
 github.com/bep/gitmap v1.1.2/go.mod h1:g9VRETxFUXNWzMiuxOwcudo6DfZkW9jOsOW0Ft4kYaY=
 github.com/bep/goat v0.5.0 h1:S8jLXHCVy/EHIoCY+btKkmcxcXFd34a0Q63/0D4TKeA=
 github.com/bep/goat v0.5.0/go.mod h1:Md9x7gRxiWKs85yHlVTvHQw9rg86Bm+Y4SuYE8CTH7c=
-github.com/bep/godartsass v0.12.0 h1:VvGLA4XpXUjKvp53SI05YFLhRFJ78G+Ybnlaz6Oul7E=
-github.com/bep/godartsass v0.12.0/go.mod h1:nXQlHHk4H1ghUk6n/JkYKG5RD43yJfcfp5aHRqT/pc4=
+github.com/bep/godartsass v0.14.0 h1:pPb6XkpyDEppS+wK0veh7OXDQc4xzOJI9Qcjb743UeQ=
+github.com/bep/godartsass v0.14.0/go.mod h1:6LvK9RftsXMxGfsA0LDV12AGc4Jylnu6NgHL+Q5/pE8=
 github.com/bep/golibsass v1.0.0 h1:gNguBMSDi5yZEZzVZP70YpuFQE3qogJIGUlrVILTmOw=
 github.com/bep/golibsass v1.0.0/go.mod h1:DL87K8Un/+pWUS75ggYv41bliGiolxzDKWJAq3eJ1MA=
 github.com/bep/gowebp v0.1.0 h1:4/iQpfnxHyXs3x/aTxMMdOpLEQQhFmF6G7EieWPTQyo=
@@ -219,7 +219,6 @@ github.com/fortytw2/leaktest v1.3.0 h1:u8491cBMTQ8ft8aeV+adlcytMZylmA5nnwwkRZjI8
 github.com/fortytw2/leaktest v1.3.0/go.mod h1:jDsjWgpAGjm2CA7WthBh/CdZYEPF31XHquHwclZch5g=
 github.com/frankban/quicktest v1.4.1/go.mod h1:36zfPVQyHxymz4cH7wlDmVwDrJuljRB60qkgn7rorfQ=
 github.com/frankban/quicktest v1.7.2/go.mod h1:jaStnuzAqU1AJdCO0l53JDCJrVDKcS03DbaAcR7Ks/o=
-github.com/frankban/quicktest v1.11.2/go.mod h1:K+q6oSqb0W0Ininfk863uOk1lMy69l/P6txr3mVT54s=
 github.com/frankban/quicktest v1.13.0/go.mod h1:qLE0fzW0VuyUAJgPU19zByoIr0HtCHN/r/VLSOOIySU=
 github.com/frankban/quicktest v1.14.2 h1:SPb1KFFmM+ybpEjPUhCCkZOM5xlovT5UbrMvWnXyBns=
 github.com/frankban/quicktest v1.14.2/go.mod h1:mgiwOwqx65TmIk1wJ6Q7wvnVMocbUorkibMOrVTHZps=
diff --git a/hugolib/integrationtest_builder.go b/hugolib/integrationtest_builder.go
index 1bfa194bd..d49e29763 100644
--- a/hugolib/integrationtest_builder.go
+++ b/hugolib/integrationtest_builder.go
@@ -6,6 +6,7 @@ import (
 	"io"
 	"os"
 	"path/filepath"
+	"regexp"
 	"strings"
 	"sync"
 	"testing"
@@ -98,6 +99,12 @@ func (s *IntegrationTestBuilder) AssertLogContains(text string) {
 	s.Assert(s.logBuff.String(), qt.Contains, text)
 }
 
+func (s *IntegrationTestBuilder) AssertLogMatches(expression string) {
+	s.Helper()
+	re := regexp.MustCompile(expression)
+	s.Assert(re.MatchString(s.logBuff.String()), qt.IsTrue, qt.Commentf(s.logBuff.String()))
+}
+
 func (s *IntegrationTestBuilder) AssertBuildCountData(count int) {
 	s.Helper()
 	s.Assert(s.H.init.data.InitCount(), qt.Equals, count)
diff --git a/resources/resource_transformers/tocss/dartsass/client.go b/resources/resource_transformers/tocss/dartsass/client.go
index b5d05b30b..647cf86aa 100644
--- a/resources/resource_transformers/tocss/dartsass/client.go
+++ b/resources/resource_transformers/tocss/dartsass/client.go
@@ -18,6 +18,7 @@ package dartsass
 import (
 	"fmt"
 	"io"
+	"strings"
 
 	"github.com/gohugoio/hugo/helpers"
 	"github.com/gohugoio/hugo/hugolib/filesystems"
@@ -41,7 +42,19 @@ func New(fs *filesystems.SourceFilesystem, rs *resources.Spec) (*Client, error)
 		return nil, err
 	}
 
-	transpiler, err := godartsass.Start(godartsass.Options{})
+	transpiler, err := godartsass.Start(godartsass.Options{
+		LogEventHandler: func(event godartsass.LogEvent) {
+			message := strings.ReplaceAll(event.Message, stdinPrefix, "")
+			switch event.Type {
+			case godartsass.LogEventTypeDebug:
+				// Log as Info for now, we may adjust this if it gets too chatty.
+				rs.Logger.Infof("Dart Sass: %s", message)
+			default:
+				// The rest are either deprecations or @warn statements.
+				rs.Logger.Warnf("Dart Sass: %s", message)
+			}
+		},
+	})
 	if err != nil {
 		return nil, err
 	}
diff --git a/resources/resource_transformers/tocss/dartsass/integration_test.go b/resources/resource_transformers/tocss/dartsass/integration_test.go
index 9434b1d52..a1ac1d59f 100644
--- a/resources/resource_transformers/tocss/dartsass/integration_test.go
+++ b/resources/resource_transformers/tocss/dartsass/integration_test.go
@@ -18,6 +18,7 @@ import (
 
 	"github.com/gohugoio/hugo/hugolib"
 	"github.com/gohugoio/hugo/resources/resource_transformers/tocss/dartsass"
+	jww "github.com/spf13/jwalterweatherman"
 )
 
 func TestTransformIncludePaths(t *testing.T) {
@@ -164,3 +165,34 @@ zoo {
 
 	b.AssertFileContent("public/index.html", `T1: moo{color:#ccc}boo{color:green}zoo{color:pink}`)
 }
+
+func TestTransformLogging(t *testing.T) {
+	if !dartsass.Supports() {
+		t.Skip()
+	}
+
+	files := `
+-- assets/scss/main.scss --
+@warn "foo";
+@debug "bar";
+
+-- config.toml --
+disableKinds = ["term", "taxonomy", "section", "page"]
+-- layouts/index.html --
+{{ $cssOpts := (dict  "transpiler" "dartsass" ) }}
+{{ $r := resources.Get "scss/main.scss" |  toCSS $cssOpts   }}
+T1: {{ $r.Content }}
+	`
+
+	b := hugolib.NewIntegrationTestBuilder(
+		hugolib.IntegrationTestConfig{
+			T:           t,
+			TxtarString: files,
+			NeedsOsFS:   true,
+			LogLevel:    jww.LevelInfo,
+		}).Build()
+
+	b.AssertLogMatches(`WARN.*Dart Sass: foo`)
+	b.AssertLogMatches(`INFO.*Dart Sass: .*assets.*main.scss:1:0: bar`)
+
+}
diff --git a/resources/resource_transformers/tocss/dartsass/transform.go b/resources/resource_transformers/tocss/dartsass/transform.go
index 57d9feadb..aaf9d4bf8 100644
--- a/resources/resource_transformers/tocss/dartsass/transform.go
+++ b/resources/resource_transformers/tocss/dartsass/transform.go
@@ -39,7 +39,8 @@ import (
 
 const (
 	// See https://github.com/sass/dart-sass-embedded/issues/24
-	stdinPlaceholder           = "HUGOSTDIN"
+	// Note: This prefix must be all lower case.
+	stdinPrefix                = "hugostdin:"
 	dartSassEmbeddedBinaryName = "dart-sass-embedded"
 )
 
@@ -75,9 +76,14 @@ func (t *transform) Transform(ctx *resources.ResourceTransformationCtx) error {
 	}
 
 	baseDir := path.Dir(ctx.SourcePath)
+	filename := stdinPrefix
+
+	if ctx.SourcePath != "" {
+		filename += t.c.sfs.RealFilename(ctx.SourcePath)
+	}
 
 	args := godartsass.Args{
-		URL:          stdinPlaceholder,
+		URL:          filename,
 		IncludePaths: t.c.sfs.RealDirs(baseDir),
 		ImportResolver: importResolver{
 			baseDir: baseDir,
@@ -106,11 +112,8 @@ func (t *transform) Transform(ctx *resources.ResourceTransformationCtx) error {
 			start := sassErr.Span.Start
 			context := strings.TrimSpace(sassErr.Span.Context)
 			filename, _ := urlToFilename(sassErr.Span.Url)
-			if filename == stdinPlaceholder {
-				if ctx.SourcePath == "" {
-					return sassErr
-				}
-				filename = t.c.sfs.RealFilename(ctx.SourcePath)
+			if strings.HasPrefix(filename, stdinPrefix) {
+				filename = filename[len(stdinPrefix):]
 			}
 
 			offsetMatcher := func(m herrors.LineMatcher) bool {