resource/scss: Fix source maps on Windows

I have tested this OK on

* Windows 10 (it did not work before this commit)
* MacOS

Fixes #4968

diff --git a/resource/tocss/scss/tocss.go b/resource/tocss/scss/tocss.go
index d606e9832deabf29a3512b6548af46347b3fe894..ec4685d87ca603f545e3970cce44bba359712beb 100644 (file)
--- a/resource/tocss/scss/tocss.go
+++ b/resource/tocss/scss/tocss.go
@@ -19,6 +19,7 @@ import (
        "fmt"
        "io"
        "path"
+       "path/filepath"
        "strings"
 
        "github.com/bep/go-tocss/scss"
@@ -84,6 +85,10 @@ func (t *toCSSTransformation) Transform(ctx *resource.ResourceTransformationCtx)
                        sourcePath = strings.TrimPrefix(sourcePath, t.c.rs.WorkingDir+helpers.FilePathSeparator)
                }
 
+               // This needs to be Unix-style slashes, even on Windows.
+               // See https://github.com/gohugoio/hugo/issues/4968
+               sourcePath = filepath.ToSlash(sourcePath)
+
                // This is a workaround for what looks like a bug in Libsass. But
                // getting this resolution correct in tools like Chrome Workspaces
                // is important enough to go this extra mile.