shithub: hugo

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resource: Add instruction to install PostCSS when missing

Fixes #5111

--- a/resource/transform.go

+++ b/resource/transform.go

@@ -391,7 +391,11 @@

 				// If a prepared bundle for this transformation chain is available, use that.

 				f := r.tryTransformedFileCache(key)

 				if f == nil {

-					return fmt.Errorf("%s: failed to transform %q (%s): %s", strings.ToUpper(tr.transformation.Key().name), tctx.InPath, tctx.InMediaType.Type(), err)

+					errMsg := err.Error()

+					if tr.transformation.Key().name == "postcss" {

+						errMsg = "PostCSS not found; install with \"npm install postcss-cli\". See https://gohugo.io/hugo-pipes/postcss/"

+					}

+					return fmt.Errorf("%s: failed to transform %q (%s): %s", strings.ToUpper(tr.transformation.Key().name), tctx.InPath, tctx.InMediaType.Type(), errMsg)

 				}

 				transformedContentr = f

 				defer f.Close()