feat: add Algolia Search support (#329)

updates #222

Co-authored-by: reuixiy <reuixiy@gmail.com>

20 files changed, 211 insertions, 94 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e43b0f9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.DS_Store
diff --git a/assets/js/algolia-search.js b/assets/js/algolia-search.js
new file mode 100644
index 0000000..1c67f38
--- /dev/null
+++ b/assets/js/algolia-search.js
@@ -0,0 +1,109 @@
+window.addEventListener("DOMContentLoaded", event => {
+    let origContent = null;
+
+    const search = instantsearch({
+        appId: "{{ .Site.Params.algoliaAppId }}",
+        apiKey: "{{ .Site.Params.algoliaApiKey }}",
+        indexName: "{{ .Site.Params.algoliaIndexName }}",
+    });
+
+    search.addWidget({
+        init: function (opts) {
+            const helper = opts.helper;
+            const input = document.getElementById("search-input");
+
+            input.addEventListener("input", function (e) {
+                helper
+                .setQuery(e.currentTarget.value) // update the parameters
+                .search(); // launch the query
+          });
+        },
+    });
+
+    search.addWidget({
+        render: function (opts) {
+            let term = opts.state.query
+            if (!term) {
+                return
+            }
+
+            const results = opts.results.hits;
+
+            let target = document.querySelector(".main-inner") || document.querySelector("main.home");
+            let replaced = [];
+
+            while (target.firstChild) {
+                replaced.push(target.firstChild);
+                target.removeChild(target.firstChild);
+            }
+
+            if (!origContent) {
+                origContent = replaced;
+            }
+
+            let title = document.createElement("h1");
+
+            title.id = "search-results";
+            title.className = "list-title";
+
+            if (results.length == 0) {
+                title.textContent = "{{ i18n "searchResultsNone" (dict "Term" "{}") }}".replace("{}", term);
+            } else if (results.length == 1) {
+                title.textContent = "{{ i18n "searchResultsTitle" (dict "Count" 1 "Term" "{}") }}".replace("{}", term);
+            } else {
+                title.textContent = "{{ i18n "searchResultsTitle" (dict "Count" 13579 "Term" "{}") }}".replace("{}", term).replace("13579", results.length);
+            }
+
+            target.appendChild(title);
+            document.title = title.textContent;
+
+            let template = document.getElementById("search-result");
+            for (let result of results) {
+                let element = template.content.cloneNode(true);
+                element.querySelector(".summary-title-link").href = element.querySelector(".read-more-link").href = result.url;
+                element.querySelector(".summary-title-link").textContent = result.title;
+                element.querySelector(".summary").textContent = truncateToEndOfSentence(result.summary, 70);
+                target.appendChild(element);
+            }
+            title.scrollIntoView(true);
+
+            {{ if .Site.Params.enableNavToggle }}
+                let navToggleLabel = document.querySelector('.nav-toggle');
+                if (navToggleLabel && navToggleLabel.classList.contains("open")) {
+                    document.getElementById(navToggleLabel.getAttribute("for")).click();
+                }
+            {{ end }}
+        },
+    });
+
+    search.start();
+
+    // This matches Hugo's own summary logic:
+    // https://github.com/gohugoio/hugo/blob/b5f39d23b86f9cb83c51da9fe4abb4c19c01c3b7/helpers/content.go#L543
+    function truncateToEndOfSentence(text, minWords)
+    {
+        let match;
+        let result = "";
+        let wordCount = 0;
+        let regexp = /(\S+)(\s*)/g;
+        while (match = regexp.exec(text)) {
+            wordCount++;
+            if (wordCount <= minWords) {
+                result += match[0];
+            }
+            else
+            {
+                let char1 = match[1][match[1].length - 1];
+                let char2 = match[2][0];
+                if (/[.?!"]/.test(char1) || char2 == "\n") {
+                    result += match[1];
+                    break;
+                }
+                else {
+                    result += match[0];
+                }
+            }
+        }
+        return result;
+    }
+}, {once: true});
diff --git a/assets/js/lunr-search.js b/assets/js/lunr-search.js
index 47d5434..0a7b91f 100644
--- a/assets/js/lunr-search.js
+++ b/assets/js/lunr-search.js
@@ -114,7 +114,7 @@ window.addEventListener("DOMContentLoaded", event => {
         try {
             let results = index.search(term);
 
-            let target = document.querySelector(".main-inner");
+            let target = document.querySelector(".main-inner") || document.querySelector("main.home");
             let replaced = [];
             while (target.firstChild) {
                 replaced.push(target.firstChild);
diff --git a/assets/scss/base/_responsive.scss b/assets/scss/base/_responsive.scss
index 35fa0a3..a54e11e 100644
--- a/assets/scss/base/_responsive.scss
+++ b/assets/scss/base/_responsive.scss
@@ -128,7 +128,7 @@
             #langs li {
                 width: auto;
             }
-            @if ($enableLunrSearch) {
+            @if ($enableSearch) {
                 .search-item {
                     grid-column: 1 / -1;
                 }
diff --git a/assets/scss/main.scss b/assets/scss/main.scss
index 97f0512..d6960b8 100644
--- a/assets/scss/main.scss
+++ b/assets/scss/main.scss
@@ -449,11 +449,11 @@ $fofPoster: url({{ $fofPoster }});
 
 // Lunr search
 
-{{ if and (eq .Site.Params.headerLayout "flex") .Site.Params.enableLunrSearch }}
-    $enableLunrSearch: true;
+{{ if and (eq .Site.Params.headerLayout "flex") (or .Site.Params.enableLunrSearch .Site.Params.enableAlgoliaSearch) }}
+    $enableSearch: true;
     @import "components/search";
 {{ else }}
-    $enableLunrSearch: false;
+    $enableSearch: false;
 {{ end }}
 
 
diff --git a/config-examples/en/config.toml b/config-examples/en/config.toml
index baf7212..e59bbee 100644
--- a/config-examples/en/config.toml
+++ b/config-examples/en/config.toml
@@ -141,9 +141,17 @@ uglyURLs = false
     mediaType = "application/json"
     baseName = "search"
 
+# Search index for Algolia
+[outputFormats.Algolia]
+    mediaType = "application/json"
+    baseName = "algolia"
+    isPlainText = true
+    notAlternative = true
+
 # Hugo’s output control
 [outputs]
     page = ["HTML"]
+    # home = ["HTML", "SectionsAtom", "SectionsRSS", "SearchIndex", "Algolia"]
     home = ["HTML", "SectionsAtom", "SectionsRSS", "SearchIndex"]
     section = ["HTML"]
     taxonomy = ["HTML"]
@@ -1360,13 +1368,31 @@ uglyURLs = false
     # Lunr search
 
     # Note: This requires SearchIndex
-    # output to be enabled.
+    #       output to be enabled.
 
     enableLunrSearch = true
     # Note: https://lunrjs.com/
 
 
     ######################################
+    # Algolia search
+
+    # Note: This requires Algolia
+    #       output to be enabled.
+    #       And you need to upload the
+    #       generated algolia.json to
+    #       Algolia every time you rebuild
+    #       your site.
+
+    enableAlgoliaSearch = false
+
+    algoliaAppId = ""
+    algoliaApiKey = ""
+    algoliaIndexName = ""
+    # Note: https://www.algolia.com/
+
+
+    ######################################
     # 404 Page
 
     fofPoster = ""
diff --git a/config-examples/zh-cn/config.toml b/config-examples/zh-cn/config.toml
index e7c7082..bf66768 100644
--- a/config-examples/zh-cn/config.toml
+++ b/config-examples/zh-cn/config.toml
@@ -135,14 +135,21 @@ uglyURLs = false
     baseName = "rss"
 
 # lunr.js 的搜索索引
-# [outputFormats.SearchIndex]
-#     mediaType = "application/json"
-#     baseName = "search"
+[outputFormats.SearchIndex]
+    mediaType = "application/json"
+    baseName = "search"
+
+# Algolia 的搜索索引
+[outputFormats.Algolia]
+    mediaType = "application/json"
+    baseName = "algolia"
+    isPlainText = true
+    notAlternative = true
 
 # Hugo 的输出控制
 [outputs]
     page = ["HTML"]
-    # home = ["HTML", "SectionsAtom", "SectionsRSS", "SearchIndex"]
+    # home = ["HTML", "SectionsAtom", "SectionsRSS", "SearchIndex", "Algolia"]
     home = ["HTML", "SectionsAtom", "SectionsRSS"]
     section = ["HTML"]
     taxonomy = ["HTML"]
@@ -1339,6 +1346,21 @@ uglyURLs = false
 
 
     ######################################
+    # Algolia search
+
+    # 说明：需要开启 `Algolia` 的输出，且需要每
+    #      次将生成的 algolia.json 文件上传到
+    #      Algolia
+
+    enableAlgoliaSearch = false
+
+    algoliaAppId = ""
+    algoliaApiKey = ""
+    algoliaIndexName = ""
+    # 说明：https://www.algolia.com/
+
+
+    ######################################
     # 404 页面
 
     # 视频封面
diff --git a/config-examples/zh-tw/config.toml b/config-examples/zh-tw/config.toml
index 3651d89..7a66eb0 100644
--- a/config-examples/zh-tw/config.toml
+++ b/config-examples/zh-tw/config.toml
@@ -135,14 +135,21 @@ uglyURLs = false
     baseName = "rss"
 
 # lunr.js 的搜尋索引
-# [outputFormats.SearchIndex]
-#     mediaType = "application/json"
-#     baseName = "search"
+[outputFormats.SearchIndex]
+    mediaType = "application/json"
+    baseName = "search"
+
+# Algolia 的搜尋索引
+[outputFormats.Algolia]
+    mediaType = "application/json"
+    baseName = "algolia"
+    isPlainText = true
+    notAlternative = true
 
 # Hugo 的輸出控制
 [outputs]
     page = ["HTML"]
-    # home = ["HTML", "SectionsAtom", "SectionsRSS", "SearchIndex"]
+    # home = ["HTML", "SectionsAtom", "SectionsRSS", "SearchIndex", "Algolia"]
     home = ["HTML", "SectionsAtom", "SectionsRSS"]
     section = ["HTML"]
     taxonomy = ["HTML"]
@@ -1339,6 +1346,21 @@ uglyURLs = false
 
 
     ######################################
+    # Algolia 搜尋
+
+    # 說明：需要開啟 `Algolia` 的輸出，且需要每
+    #      次將生成的 algolia.json 文件上傳到
+    #      Algolia
+
+    enableAlgoliaSearch = false
+
+    algoliaAppId = ""
+    algoliaApiKey = ""
+    algoliaIndexName = ""
+    # 說明：https://www.algolia.com/
+
+
+    ######################################
     # 404 頁面
 
     # 影片封面
diff --git a/images/screenshot.png b/images/screenshot.png
index d1bc7fa..415ff02 100644
--- a/images/screenshot.png
+++ b/images/screenshot.png
diff --git a/images/tn.png b/images/tn.png
index 73ada5e..8bb4f51 100644
--- a/images/tn.png
+++ b/images/tn.png
diff --git a/layouts/index.algolia.json b/layouts/index.algolia.json
new file mode 100644
index 0000000..d46134d
--- /dev/null
+++ b/layouts/index.algolia.json
@@ -0,0 +1,5 @@
+{{- $.Scratch.Add "index" slice -}}
+{{- range (where .Site.RegularPages "Section" "in" .Site.Params.mainSections) -}}
+    {{- $.Scratch.Add "index" (dict "objectID" .File.UniqueID "date" .Date.UTC.Unix "description" .Description "fuzzywordcount" .FuzzyWordCount "kind" .Kind "lang" .Lang "lastmod" .Lastmod.UTC.Unix "publishdate" .PublishDate.UTC.Unix "relpermalink" .RelPermalink "summary" .Summary "title" .Title "url" .Permalink "wordcount" .WordCount "section" .Section "tags" .Params.tags "categories" .Section "content" .Content)}}
+{{- end -}}
+{{- $.Scratch.Get "index" | jsonify -}}
diff --git a/layouts/index.searchindex.json b/layouts/index.searchindex.json
index df5e9d7..34a740c 100644
--- a/layouts/index.searchindex.json
+++ b/layouts/index.searchindex.json
@@ -1,5 +1,5 @@
 [
-    {{- range $index, $page := where .Site.Pages "Content" "ne" ("" | safeHTML)  -}}
+    {{- range $index, $page := where .Site.RegularPages "Section" "in" .Site.Params.mainSections -}}
         {{- if gt $index 0 -}}
             ,
         {{- end -}}
diff --git a/layouts/partials/menu.html b/layouts/partials/menu.html
index 91e9101..cd02605 100644
--- a/layouts/partials/menu.html
+++ b/layouts/partials/menu.html
@@ -29,7 +29,7 @@
                     {{ end }}
                 {{ end }}
             {{ else if eq .Identifier "search" }}
-                {{ if and $.Site.Params.enableLunrSearch (eq $.Site.Params.headerLayout "flex") }}
+                {{ if and (eq $.Site.Params.headerLayout "flex") (or $.Site.Params.enableLunrSearch $.Site.Params.enableAlgoliaSearch) }}
                     {{- $iconName := (string .Post) -}}
                     <li class="menu-item search-item">
                         {{ partial "components/search.html" (dict "$" $ctx "iconName" $iconName) }}
diff --git a/layouts/partials/pages/post.html b/layouts/partials/pages/post.html
index e48bd70..fb68107 100644
--- a/layouts/partials/pages/post.html
+++ b/layouts/partials/pages/post.html
@@ -35,7 +35,7 @@
             {{- end -}}
 
             <div class="post-body e-content">
-              {{ partial "utils/content.html" . }}
+                {{ partial "utils/content.html" . }}
             </div>
 
             {{ partial "components/post-copyright.html" . }}
diff --git a/layouts/partials/script.html b/layouts/partials/script.html
index 9ffb573..c7f6053 100644
--- a/layouts/partials/script.html
+++ b/layouts/partials/script.html
@@ -36,6 +36,10 @@
     {{- $scripts = union $scripts (partial "third-party/lunr-search.html" .) -}}
 {{- end -}}
 
+{{- if .Site.Params.enableAlgoliaSearch -}}
+    {{- $scripts = union $scripts (partial "third-party/algolia-search.html" .) -}}
+{{- end -}}
+
 {{- $scripts = union $scripts (slice "js/custom.js") -}}
 
 {{- $processedScripts := slice ("" | resources.FromString "dummy.js") -}}
diff --git a/layouts/partials/third-party/algolia-search.html b/layouts/partials/third-party/algolia-search.html
new file mode 100644
index 0000000..9507fdb
--- /dev/null
+++ b/layouts/partials/third-party/algolia-search.html
@@ -0,0 +1,4 @@
+{{- $scripts := slice "https://cdn.jsdelivr.net/npm/instantsearch.js@2/dist/instantsearch.min.js" -}}
+
+{{- $scripts = union $scripts (slice "js/algolia-search.js") -}}
+{{- return $scripts -}}
diff --git a/static/icons/android-chrome-512x512.png b/static/icons/android-chrome-512x512.png
index 44e4c06..b5f6299 100644
--- a/static/icons/android-chrome-512x512.png
+++ b/static/icons/android-chrome-512x512.png
diff --git a/static/icons/apple-touch-icon.png b/static/icons/apple-touch-icon.png
index 64be0f9..a244fb4 100644
--- a/static/icons/apple-touch-icon.png
+++ b/static/icons/apple-touch-icon.png
diff --git a/static/icons/mstile-150x150.png b/static/icons/mstile-150x150.png
index ff392eb..95ed2a6 100644
--- a/static/icons/mstile-150x150.png
+++ b/static/icons/mstile-150x150.png
diff --git a/static/icons/safari-pinned-tab.svg b/static/icons/safari-pinned-tab.svg
index 3471ca8..1a8adb4 100644
--- a/static/icons/safari-pinned-tab.svg
+++ b/static/icons/safari-pinned-tab.svg
@@ -1,77 +1 @@
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