From 10141e278ef0289f5c82cc70c1d276f1675c007b Mon Sep 17 00:00:00 2001
From: "Daniel F. Dickinson"
 <20735818+danielfdickinson@users.noreply.github.com>
Date: Fri, 22 Oct 2021 10:29:36 -0400
Subject: [PATCH] Add webp to processable formats (#540)

* Add webp format only if using Hugo extended

This keeps PaperMod from having a hard dependency on Hugo extended.
---
 layouts/partials/cover.html | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/layouts/partials/cover.html b/layouts/partials/cover.html
index 6c7d1ae..8ba2cd3 100644
--- a/layouts/partials/cover.html
+++ b/layouts/partials/cover.html
@@ -9,7 +9,10 @@
         {{- if $addLink }}<a href="{{ (path.Join .RelPermalink .Params.cover.image) | absURL }}" target="_blank"
             rel="noopener noreferrer">{{ end -}}
         {{- $sizes := (slice "360" "480" "720" "1080" "1500") }}
-        {{- $processableFormats := (slice "jpg" "jpeg" "png" "tif" "bmp" "gif") }}
+        {{- $processableFormats := (slice "jpg" "jpeg" "png" "tif" "bmp" "gif") -}}
+        {{- if hugo.IsExtended -}}
+            {{- $processableFormats = $processableFormats | append "webp" -}}
+        {{- end -}}
         {{- $prod := (hugo.IsProduction | or (eq .Site.Params.env "production")) }}
         {{- if (and (in $processableFormats $cover.MediaType.SubType) ($responsiveImages) (eq $prod true)) }}
         <img loading="lazy" srcset="{{- range $size := $sizes -}}