implement client side site search

see https://gist.github.com/eddiewebb/735feb48f50f0ddd65ae5606a1cb41ae

content/search.md

@@ -0,0 +1,9 @@
+---
+title: "Search Results"
+sitemap:
+  priority : 0.1
+layout: "search"
+---
+
+dummy page
+howto for search: https://gist.github.com/eddiewebb/735feb48f50f0ddd65ae5606a1cb41ae

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) -}}
+{{- end -}}
+{{- $.Scratch.Get "index" | jsonify -}}

layouts/_default/search.html

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+{{ define "content" }}
+<script src="/jquery-3.4.0.js"></script>
+<script src="/fuse.js"></script>
+<script src="/jquery.mark.js"></script>
+<script src="/search.js"></script>
+
+  <div class="my-auto" >
+    <form action="{{ "search" | absURL }}">
+      <input id="search-query" name="s"/>
+    </form>
+    <div id="search-results">
+     <h3>Matching pages</h3>
+    </div>
+  </div>
+
+<!-- this template is sucked in by search.js and appended to the search-results div above. So editing here will adjust style -->
+<script id="search-result-template" type="text/x-js-template">
+    <div id="summary-${key}">
+      <h4><a href="${link}">${title}</a></h4>
+      <p>${snippet}</p>
+      ${ isset tags }<p>Tags: ${tags}</p>${ end }
+      ${ isset categories }<p>Categories: ${categories}</p>${ end }
+    </div>
+</script>
+{{ end }}

static/search.js

@@ -0,0 +1,108 @@
+summaryInclude=60;
+var fuseOptions = {
+  shouldSort: true,
+  includeMatches: true,
+  threshold: 0.0,
+  tokenize:true,
+  location: 0,
+  distance: 100,
+  maxPatternLength: 32,
+  minMatchCharLength: 1,
+  keys: [
+    {name:"title",weight:0.8},
+    {name:"contents",weight:0.5},
+    {name:"tags",weight:0.3},
+    {name:"categories",weight:0.3}
+  ]
+};
+
+
+var searchQuery = param("s");
+if(searchQuery){
+  $("#search-query").val(searchQuery);
+  executeSearch(searchQuery);
+}else {
+  $('#search-results').append("<p>Please enter a word or phrase above</p>");
+}
+
+
+
+function executeSearch(searchQuery){
+  $.getJSON( "/index.json", function( data ) {
+    var pages = data;
+    var fuse = new Fuse(pages, fuseOptions);
+    var result = fuse.search(searchQuery);
+    console.log({"matches":result});
+    if(result.length > 0){
+      populateResults(result);
+    }else{
+      $('#search-results').append("<p>No matches found</p>");
+    }
+  });
+}
+
+function populateResults(result){
+  $.each(result,function(key,value){
+    var contents= value.item.contents;
+    var snippet = "";
+    var snippetHighlights=[];
+    var tags =[];
+    if( fuseOptions.tokenize ){
+      snippetHighlights.push(searchQuery);
+    }else{
+      $.each(value.matches,function(matchKey,mvalue){
+        if(mvalue.key == "tags" || mvalue.key == "categories" ){
+          snippetHighlights.push(mvalue.value);
+        }else if(mvalue.key == "contents"){
+          start = mvalue.indices[0][0]-summaryInclude>0?mvalue.indices[0][0]-summaryInclude:0;
+          end = mvalue.indices[0][1]+summaryInclude<contents.length?mvalue.indices[0][1]+summaryInclude:contents.length;
+          snippet += contents.substring(start,end);
+          snippetHighlights.push(mvalue.value.substring(mvalue.indices[0][0],mvalue.indices[0][1]-mvalue.indices[0][0]+1));
+        }
+      });
+    }
+
+    if(snippet.length<1){
+      snippet += contents.substring(0,summaryInclude*2);
+    }
+    //pull template from hugo templarte definition
+    var templateDefinition = $('#search-result-template').html();
+    //replace values
+    var output = render(templateDefinition,{key:key,title:value.item.title,link:value.item.permalink,tags:value.item.tags,categories:value.item.categories,snippet:snippet});
+    $('#search-results').append(output);
+
+    $.each(snippetHighlights,function(snipkey,snipvalue){
+      $("#summary-"+key).mark(snipvalue);
+    });
+
+  });
+}
+
+function param(name) {
+    return decodeURIComponent((location.search.split(name + '=')[1] || '').split('&')[0]).replace(/\+/g, ' ');
+}
+
+function render(templateString, data) {
+  var conditionalMatches,conditionalPattern,copy;
+  conditionalPattern = /\$\{\s*isset ([a-zA-Z]*) \s*\}(.*)\$\{\s*end\s*}/g;
+  //since loop below depends on re.lastInxdex, we use a copy to capture any manipulations whilst inside the loop
+  copy = templateString;
+  while ((conditionalMatches = conditionalPattern.exec(templateString)) !== null) {
+    if(data[conditionalMatches[1]]){
+      //valid key, remove conditionals, leave contents.
+      copy = copy.replace(conditionalMatches[0],conditionalMatches[2]);
+    }else{
+      //not valid, remove entire section
+      copy = copy.replace(conditionalMatches[0],'');
+    }
+  }
+  templateString = copy;
+  //now any conditionals removed we can do simple substitution
+  var key, find, re;
+  for (key in data) {
+    find = '\\$\\{\\s*' + key + '\\s*\\}';
+    re = new RegExp(find, 'g');
+    templateString = templateString.replace(re, data[key]);
+  }
+  return templateString;
+}