add fuse.js for search box

9 files changed, 191 insertions, 49 deletions

diff --git a/README.md b/README.md
index 1b85333..6e3a882 100644
--- a/README.md
+++ b/README.md
@@ -95,6 +95,7 @@ npm run build
 * Fonts. `杨任东竹石体` was used for the banner in the beginning. This font is okay for commercial usage. However, I wonder if it is compatible with ~~GPL~~ MIT, so I replaced it with an `exampleFont` in the `exampleSite`. See `config.toml`.
 * And the open, warm-hearted [Noto Serif CN](https://www.google.com/get/noto/help/cjk/). Always a good choice for Chinese words. Under [OFL 1.1](https://github.com/googlefonts/noto-cjk/blob/master/LICENSE). 
 * Beautiful icons made by [Remix-Design](https://github.com/Remix-Design/remixicon). Under [Apache 2.0](https://raw.githubusercontent.com/Remix-Design/RemixIcon/master/License).
+* [fuse.js](https://fusejs.io/) for fuzzy search, and a [blog post](https://ttys3.net/post/hugo/hugo-fast-search/) (in Chinese) about how to use it. 
 
 Thanks.
 
diff --git a/exampleSite/config.toml b/exampleSite/config.toml
index 97bcd46..7882c07 100644
--- a/exampleSite/config.toml
+++ b/exampleSite/config.toml
@@ -20,6 +20,7 @@ Tokiwa-iro is the theme color of this site.
 """
 favicon = "img/favicon-32x32.png"
 math = true # for introducing $KaTEX$
+fuse = true # for searchbox. "JSON" must added to output contents. See [outputs].
 env = "production" # for Google Analytics and DISQUS.
 useChineseFonts = true
 bannerFont = "fonts/exampleFont"
@@ -63,3 +64,6 @@ mail="mailto:anon@example.com"
 youtube="http://youtube.com/"
 github="http://github.com/"
 # any icon in layouts/partials/svg can be used by the name without the "-line.svg"
+
+[outputs]
+  home = ["HTML", "RSS", "JSON"]
diff --git a/layouts/_default/index.json b/layouts/_default/index.json
new file mode 100644
index 0000000..cafad40
--- /dev/null
+++ b/layouts/_default/index.json
@@ -0,0 +1,5 @@
+{{- $.Scratch.Add "index" slice -}}
+{{- range .Site.RegularPages -}}
+    {{- $.Scratch.Add "index" (dict "title" .Title "tags" .Params.tags "categories" .Params.categories "contents" .Plain "permalink" .Permalink "date" .Date "section" .Section) -}}
+{{- end -}}
+{{- $.Scratch.Get "index" | jsonify -}}
diff --git a/layouts/partials/site-scripts.html b/layouts/partials/site-scripts.html
index 4e3b0ea..03c3d73 100644
--- a/layouts/partials/site-scripts.html
+++ b/layouts/partials/site-scripts.html
@@ -1,4 +1,8 @@
 {{ $script := .Site.Data.webpack_assets.app }}
 {{ with $script.js }}
 <script src="{{ relURL (printf "%s%s" "dist/" .) }}"></script>
+{{ end }}
+{{ if .Site.Params.fuse }}
+<script src="/lib/fuse.min.js"></script> <!-- download and copy over fuse.min.js file from fusejs.io -->
+<script src="/lib/fastsearch.js"></script>
 {{ end }}
\ No newline at end of file
diff --git a/layouts/partials/social-follow.html b/layouts/partials/social-follow.html
index 17d3d1f..70c47b6 100644
--- a/layouts/partials/social-follow.html
+++ b/layouts/partials/social-follow.html
@@ -1,6 +1,6 @@
 
 {{ $count := len .Site.Social}}
-<div class="flex flex-wrap-reverse md:justify-end content-end md:content-start justify-start items-start {{if gt $count 4}}md:flex-col{{end}} pb-2 max-h-16">
+<div class="flex flex-wrap-reverse md:justify-end content-end md:content-start justify-start items-start {{if gt $count 4}}md:flex-col{{end}}  max-h-16">
 	{{ range $key,$value:=.Site.Social }}
 	<a href='{{$value}}' target="_blank" class="{{- $key}} icon pl-1 text-eucalyptus-400 hover:text-java-400" title="{{- $key}} link" rel="noopener"
 		aria-label="follow on {{$key}}——Opens in a new window">
@@ -11,4 +11,11 @@
 		</div>
 	</a>
 	{{ end }}
-</div>
\ No newline at end of file
+</div>
+{{ if .Site.Params.fuse }}
+<div id="fastSearch" class="mb-2">
+    <ul id="searchResults" class="bg-gray-200 px-2 my-2">
+    </ul>
+    <input id="searchInput" class="bg-gray-100 border-b border-b-1 focus:border-eucalyptus-500 md:text-right px-2" tabindex="0" placeholder="search..." size="10">
+</div>
+{{ end }}
\ No newline at end of file
diff --git a/src/sass/style.scss b/src/sass/style.scss
index a432957..7bfa967 100644
--- a/src/sass/style.scss
+++ b/src/sass/style.scss
@@ -296,10 +296,11 @@ a {
 // }
 @supports (-webkit-backdrop-filter:none) or (backdrop-filter:none) {
     .bg-opacity-custom {
-        -webkit-backdrop-filter: blur(3px);    
-        backdrop-filter: blur(3px);   
+        -webkit-backdrop-filter: blur(3px);
+        backdrop-filter: blur(3px);
     }
 }
+
 /******************Table of Contents' Style***********************/
 
 details.toc {
@@ -318,62 +319,62 @@ details.toc {
             list-style-position: inside;
             margin-right: 1em;
         }
-        }
+    }
 
-        nav ul>li {
-            @apply font-light;
+    nav ul>li {
+        @apply font-light;
 
-            @apply text-java-700;
+        @apply text-java-700;
 
-            a {
-                @apply text-java-700;
-            }
+        a {
+            @apply text-java-700;
         }
+    }
 
-        nav ul ul>li {
-            @apply leading-normal;
-            @apply text-sm;
+    nav ul ul>li {
+        @apply leading-normal;
+        @apply text-sm;
 
-            @apply text-java-600;
+        @apply text-java-600;
 
-            a {
-                @apply text-java-600;
-            }
+        a {
+            @apply text-java-600;
         }
+    }
 
-        >summary {
-            cursor: pointer;
-            list-style: none;
-            outline: none;
-        }
+    >summary {
+        cursor: pointer;
+        list-style: none;
+        outline: none;
+    }
 
-        >summary::-webkit-details-marker {
-            display: none;
-        }
+    >summary::-webkit-details-marker {
+        display: none;
+    }
 
-        hr {
-            border-top: 1px dotted theme("colors.java.400");
-            border-bottom: 1px dotted #fff;
-            margin-top: 0.8em;
-            margin-bottom: 0.4em;
-            text-align: center;
-        }
+    hr {
+        border-top: 1px dotted theme("colors.java.400");
+        border-bottom: 1px dotted #fff;
+        margin-top: 0.8em;
+        margin-bottom: 0.4em;
+        text-align: center;
+    }
 
-        hr:after {
-            content: 'Table of Contents';
-            display: inline-block;
-            position: relative;
-            top: -19px;
-            padding: 0 5px;
-            @apply bg-opacity-75;
-            background: theme("colors.gray.100");
-            color: theme("colors.java.700");
-            font-size: 16px;
-            font-family: theme("fontFamily.serif");
-        }
+    hr:after {
+        content: 'Table of Contents';
+        display: inline-block;
+        position: relative;
+        top: -19px;
+        padding: 0 5px;
+        @apply bg-opacity-75;
+        background: theme("colors.gray.100");
+        color: theme("colors.java.700");
+        font-size: 16px;
+        font-family: theme("fontFamily.serif");
+    }
 
-        }
+}
 
-        /*! purgecss end ignore */
+/*! purgecss end ignore */
 
-        @import "tailwindcss/utilities";
\ No newline at end of file
+@import "tailwindcss/utilities";
\ No newline at end of file
diff --git a/static/dist/app.css b/static/dist/app.css
index 3093ddf..e0dd7a6 100644
--- a/static/dist/app.css
+++ b/static/dist/app.css
@@ -1 +1 @@
-/*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */html{line-height:1.15;-webkit-text-size-adjust:100%}body{margin:0}main{display:block}h1{font-size:2em;margin:.67em 0}hr{box-sizing:content-box;height:0;overflow:visible}pre{font-family:monospace,monospace;font-size:1em}a{background-color:transparent}abbr[title]{border-bottom:none;text-decoration:underline;-webkit-text-decoration:underline dotted;text-decoration:underline dotted}b,strong{font-weight:bolder}code,kbd,samp{font-family:monospace,monospace;font-size:1em}small{font-size:80%}sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}img{border-style:none}button,input,optgroup,select,textarea{font-family:inherit;font-size:100%;line-height:1.15;margin:0}button,input{overflow:visible}button,select{text-transform:none}[type=button],[type=reset],[type=submit],button{-webkit-appearance:button}[type=button]::-moz-focus-inner,[type=reset]::-moz-focus-inner,[type=submit]::-moz-focus-inner,button::-moz-focus-inner{border-style:none;padding:0}[type=button]:-moz-focusring,[type=reset]:-moz-focusring,[type=submit]:-moz-focusring,button:-moz-focusring{outline:1px dotted ButtonText}fieldset{padding:.35em .75em .625em}legend{box-sizing:border-box;color:inherit;display:table;max-width:100%;padding:0;white-space:normal}progress{vertical-align:baseline}textarea{overflow:auto}[type=checkbox],[type=radio]{box-sizing:border-box;padding:0}[type=number]::-webkit-inner-spin-button,[type=number]::-webkit-outer-spin-button{height:auto}[type=search]{-webkit-appearance:textfield;outline-offset:-2px}[type=search]::-webkit-search-decoration{-webkit-appearance:none}::-webkit-file-upload-button{-webkit-appearance:button;font:inherit}details{display:block}summary{display:list-item}[hidden],template{display:none}blockquote,dd,dl,figure,h1,h2,h3,h4,h5,h6,hr,p,pre{margin:0}button{background-color:transparent;background-image:none;padding:0}button:focus{outline:1px dotted;outline:5px auto -webkit-focus-ring-color}fieldset,ol,ul{margin:0;padding:0}ol,ul{list-style:none}html{font-family:Source Han Sans SC,Source Han Sans CN,Noto Sans CJK SC,Noto Sans,-apple-system,Helvetica Neue,Helvetica,Nimbus Sans 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diff --git a/static/lib/fastsearch.js b/static/lib/fastsearch.js
new file mode 100644
index 0000000..52dfdc1
--- /dev/null
+++ b/static/lib/fastsearch.js
@@ -0,0 +1,111 @@
+var fuse; // holds our search engine
+var fuseIndex;
+var searchVisible = false;
+var firstRun = true; // allow us to delay loading json data unless search activated
+var list = document.getElementById('searchResults'); // targets the <ul>
+var first = list.firstChild; // first child of search list
+var last = list.lastChild; // last child of search list
+var maininput = document.getElementById('searchInput'); // input box for search
+var resultsAvailable = false; // Did we get any search results?
+
+
+// ==========================================
+// execute search as each character is typed
+//
+document.getElementById("searchInput").onfocus = function (e) {
+  if (firstRun) {
+    loadSearch()
+    firstRun = false
+  }
+}
+document.getElementById("searchInput").onkeyup = function (e) {
+  if (firstRun) {
+    loadSearch()
+    firstRun = false
+  }
+  executeSearch(this.value);
+}
+
+
+// ==========================================
+// fetch some json without jquery
+//
+function fetchJSONFile(path, callback) {
+  var httpRequest = new XMLHttpRequest();
+  httpRequest.onreadystatechange = function () {
+    if (httpRequest.readyState === 4) {
+      if (httpRequest.status === 200) {
+        var data = JSON.parse(httpRequest.responseText);
+        if (callback) callback(data);
+      }
+    }
+  };
+  httpRequest.open('GET', path);
+  httpRequest.send();
+}
+
+
+// ==========================================
+// load our search index, only executed once
+// on first call of search box (CMD-/)
+//
+function loadSearch() {
+  console.log('loadSearch()')
+  fetchJSONFile('/index.json', function (data) {
+
+    var options = { // fuse.js options; check fuse.js website for details
+      shouldSort: true,
+      location: 0,
+      distance: 100,
+      threshold: 0.4,
+      minMatchCharLength: 2,
+      keys: [
+        'permalink',
+        'title',
+        'tags',
+        'contents'
+      ]
+    };
+    // Create the Fuse index
+    fuseIndex = Fuse.createIndex(options.keys, data)
+    fuse = new Fuse(data, options, fuseIndex); // build the index from the json file
+  });
+}
+
+
+// ==========================================
+// using the index we loaded on CMD-/, run 
+// a search query (for "term") every time a letter is typed
+// in the search box
+//
+function executeSearch(term) {
+  let results = fuse.search(term); // the actual query being run using fuse.js
+  let searchitems = ''; // our results bucket
+
+  if (results.length === 0) { // no results based on what was typed into the input box
+    resultsAvailable = false;
+    searchitems = '';
+  } else { // build our html
+    // console.log(results)
+    permalinks = [];
+    numLimit = 5;
+    for (let item in results) { // only show first 5 results
+      if (item > numLimit) {
+        break;
+      }
+      if (permalinks.includes(results[item].item.permalink)) {
+        continue;
+      }
+      //   console.log('item: %d, title: %s', item, results[item].item.title)
+      searchitems = searchitems + '<li><a href="' + results[item].item.permalink + '" tabindex="0">' + '<span class="title">' + results[item].item.title + '</span></a></li>';
+      permalinks.push(results[item].item.permalink);
+    }
+    resultsAvailable = true;
+  }
+
+  document.getElementById("searchResults").innerHTML = searchitems;
+  if (results.length > 0) {
+    first = list.firstChild.firstElementChild; // first result container — used for checking against keyboard up/down location
+    last = list.lastChild.firstElementChild; // last result container — used for checking against keyboard up/down location
+  }
+}
diff --git a/static/lib/fuse.min.js b/static/lib/fuse.min.js
new file mode 100644
index 0000000..cf145db
--- /dev/null
+++ b/static/lib/fuse.min.js
@@ -0,0 +1,9 @@
+/**
+ * Fuse.js v6.4.0 - Lightweight fuzzy-search (http://fusejs.io)
+ *
+ * Copyright (c) 2020 Kiro Risk (http://kiro.me)
+ * All Rights Reserved. Apache Software License 2.0
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ */
+var e,t;e=this,t=function(){"use strict";function e(t){return(e="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(t)}function t(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function n(e,t){for(var n=0;n<t.length;n++){var r=t[n];r.enumerable=r.enumerable||!1,r.configurable=!0,"value"in r&&(r.writable=!0),Object.defineProperty(e,r.key,r)}}function r(e,t,r){return t&&n(e.prototype,t),r&&n(e,r),e}function i(e,t,n){return t in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}function o(e,t){var n=Object.keys(e);if(Object.getOwnPropertySymbols){var r=Object.getOwnPropertySymbols(e);t&&(r=r.filter((function(t){return Object.getOwnPropertyDescriptor(e,t).enumerable}))),n.push.apply(n,r)}return n}function c(e){for(var t=1;t<arguments.length;t++){var 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