From 01a25ecaecdd075fbd2333c69c4a794a2da6283f Mon Sep 17 00:00:00 2001
From: George Cushen <gcushen@users.noreply.github.com>
Date: Tue, 1 Jun 2021 19:35:57 +0100
Subject: [PATCH] feat: delay PostCSS processing with resources.PostProcess

resources.PostProcess delays processing of a resource until the rest of the build has finished.

This allows the public folder or Hugo's hugo_stats.json file to be used as the content for PurgeCSS, so that only CSS that is used on the final website will be included.

Close #2318
---
 wowchemy/layouts/partials/site_head.html | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/wowchemy/layouts/partials/site_head.html b/wowchemy/layouts/partials/site_head.html
index 24428505..2f48b227 100644
--- a/wowchemy/layouts/partials/site_head.html
+++ b/wowchemy/layouts/partials/site_head.html
@@ -198,6 +198,10 @@
   {{- if hugo.IsProduction -}}
     {{- $style = $style | fingerprint "md5" -}}
   {{- end -}}
+  {{- if eq (getenv "WC_POST_CSS") "true" -}}
+    {{/* PostProcess must be last action in the pipeline */}}
+    {{- $style = $style | resources.PostProcess -}}
+  {{- end -}}
   <link rel="stylesheet" href="{{ $style.RelPermalink }}" />
 
   {{ partial "marketing/google_analytics" . }}