From e6d2d90a1b52079262d1543dffa4046ab17ee1df Mon Sep 17 00:00:00 2001
From: razonyang <razonyang@gmail.com>
Date: Sun, 14 May 2023 12:00:20 +0800
Subject: [PATCH] perf: simplify the hashing method

---
 layouts/partials/search/assets/js-resource.html          | 4 ++--
 layouts/partials/search/functions/pages.html             | 4 ++++
 layouts/partials/search/functions/search-index-hash.html | 9 +++++++++
 layouts/partials/search/functions/search-index-url.html  | 3 ---
 layouts/partials/search/index.json.html                  | 5 ++---
 5 files changed, 17 insertions(+), 8 deletions(-)
 create mode 100644 layouts/partials/search/functions/pages.html
 create mode 100644 layouts/partials/search/functions/search-index-hash.html
 delete mode 100644 layouts/partials/search/functions/search-index-url.html

diff --git a/layouts/partials/search/assets/js-resource.html b/layouts/partials/search/assets/js-resource.html
index bbf399d1455..6fda54a1a92 100644
--- a/layouts/partials/search/assets/js-resource.html
+++ b/layouts/partials/search/assets/js-resource.html
@@ -75,8 +75,8 @@
 {{- range .Sites }}
   {{- $site := . }}
   {{- with .Home.OutputFormats.Get "SearchIndex" }}
-    {{- $idxCtx := dict "Site" $site "Index" . }}
-    {{- $indexURL := partialCached "search/functions/search-index-url" $idxCtx $idxCtx }}
+    {{- $hash := partialCached "search/functions/search-index-hash" $site $site }}
+    {{- $indexURL := printf "%s?v=%s" .RelPermalink $hash }}
     {{- $indices = $indices | append $indexURL }}
   {{- end }}
 {{- end }}
diff --git a/layouts/partials/search/functions/pages.html b/layouts/partials/search/functions/pages.html
new file mode 100644
index 00000000000..f5eb88207b3
--- /dev/null
+++ b/layouts/partials/search/functions/pages.html
@@ -0,0 +1,4 @@
+{{- $indexAllPages := default true .Site.Params.search.index_all_pages -}}
+{{- $pages := cond $indexAllPages .Site.Pages .Site.RegularPages -}}
+{{- $pages = where $pages "Params.noindex" "ne" true -}}
+{{- return $pages }}
diff --git a/layouts/partials/search/functions/search-index-hash.html b/layouts/partials/search/functions/search-index-hash.html
new file mode 100644
index 00000000000..5ade9fcd7be
--- /dev/null
+++ b/layouts/partials/search/functions/search-index-hash.html
@@ -0,0 +1,9 @@
+{{/* This hashing function just calculate the number of pages and the lastmod time. */}}
+{{- $ctx := dict "Site" . }}
+{{- $pages := partialCached "search/functions/pages" $ctx $ctx -}}
+{{- $hash := printf "total=%d" $pages.Len }}
+{{- $latest := first 1 $pages.ByLastmod.Reverse }}
+{{- with index $latest 0 }}
+  {{- $hash = printf "%s&lastmod=%d" $hash .Lastmod.Unix }}
+{{- end }}
+{{- return ($hash | md5) }}
diff --git a/layouts/partials/search/functions/search-index-url.html b/layouts/partials/search/functions/search-index-url.html
deleted file mode 100644
index 05f47a42575..00000000000
--- a/layouts/partials/search/functions/search-index-url.html
+++ /dev/null
@@ -1,3 +0,0 @@
-{{- $ctx := dict "Site" .Site }}
-{{- $hash := partialCached "search/index.json" $ctx $ctx | md5 }}
-{{- return (printf "%s?v=%s" .Index.RelPermalink $hash) }}
diff --git a/layouts/partials/search/index.json.html b/layouts/partials/search/index.json.html
index 0680ab941e2..0ba16ed206e 100644
--- a/layouts/partials/search/index.json.html
+++ b/layouts/partials/search/index.json.html
@@ -1,9 +1,8 @@
 {{- $items := slice -}}
 {{- $indexContent := default false .Site.Params.search.index_content -}}
 {{- $years := true }}
-{{- $indexAllPages := default true .Site.Params.search.index_all_pages -}}
-{{- $pages := cond $indexAllPages .Site.Pages .Site.RegularPages -}}
-{{- $pages = where $pages "Params.noindex" "ne" true -}}
+{{- $pagesCtx := dict "Site" .Site }}
+{{- $pages := partialCached "search/functions/pages" $pagesCtx $pagesCtx -}}
 {{- range $pages -}}
   {{- $page := . -}}
   {{- $item := newScratch -}}