mirror of
https://github.com/McShelby/hugo-theme-relearn.git
synced 2024-11-30 11:13:06 +00:00
314 lines
12 KiB
JavaScript
314 lines
12 KiB
JavaScript
window.relearn = window.relearn || {};
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window.relearn.runInitialSearch = function(){
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if( window.relearn.isSearchInit && window.relearn.isLunrInit ){
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var input = document.querySelector('#R-search-by-detail');
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if( !input ){
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return;
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}
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var value = input.value;
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searchDetail( value );
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}
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}
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var lunrIndex, pagesIndex;
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function initLunrIndex( index ){
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pagesIndex = index;
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// Set up Lunr by declaring the fields we use
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// Also provide their boost level for the ranking
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lunrIndex = lunr(function() {
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this.use(lunr.multiLanguage.apply(null, contentLangs));
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this.ref('index');
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this.field('title', {
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boost: 15
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});
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this.field('tags', {
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boost: 10
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});
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this.field('content', {
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boost: 5
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});
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this.pipeline.remove(lunr.stemmer);
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this.searchPipeline.remove(lunr.stemmer);
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// Feed Lunr with each file and let LUnr actually index them
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pagesIndex.forEach(function(page, idx) {
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page.index = idx;
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this.add(page);
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}, this);
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});
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window.relearn.isLunrInit = true;
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window.relearn.runInitialSearch();
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}
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function triggerSearch(){
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var input = document.querySelector('#R-search-by-detail');
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if( !input ){
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return;
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}
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var value = input.value;
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searchDetail( value );
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// add a new entry to the history after the user
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// changed the term; this does not reload the page
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// but will add to the history and update the address bar URL
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var url = new URL( window.location );
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var oldValue = url.searchParams.get( 'search-by' );
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if( value != oldValue ){
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var state = window.history.state || {};
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state = Object.assign( {}, ( typeof state === 'object' ) ? state : {} );
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url.searchParams.set( 'search-by', value );
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state.search = url.toString();
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// with normal pages, this is handled by the 'pagehide' event, but this
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// doesn't fire in case of pushState, so we have to do the same thing
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// here, too
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state.contentScrollTop = +elc.scrollTop;
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window.history.pushState( state, '', url );
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}
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}
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window.addEventListener( 'popstate', function ( event ){
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// restart search if browsed thru history
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if( event.state ){
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var state = window.history.state || {};
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state = Object.assign( {}, ( typeof state === 'object' ) ? state : {} );
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if( state.search ) {
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var url = new URL( state.search );
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if( url.searchParams.has('search-by') ){
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var search = url.searchParams.get( 'search-by' );
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// we have to insert the old search term into the inputs
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var inputs = document.querySelectorAll( 'input.search-by' );
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inputs.forEach( function( e ){
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e.value = search;
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var event = document.createEvent( 'Event' );
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event.initEvent( 'input', false, false );
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e.dispatchEvent( event );
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});
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// recreate the last search results and eventually
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// restore the previous scrolling position
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searchDetail( search );
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}
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}
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}
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});
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var input = document.querySelector('#R-search-by-detail');
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if( input ){
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input.addEventListener( 'keydown', function(event) {
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// if we are pressing ESC in the searchdetail our focus will
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// be stolen by the other event handlers, so we have to refocus
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// here after a short while
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if (event.key == "Escape") {
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setTimeout( function(){ input.focus(); }, 0 );
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}
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});
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}
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function initLunrJson() {
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// old way to load the search index via XHR;
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// this does not work if pages are served via
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// file:// protocol; this is only left for
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// backward compatiblity if the user did not
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// define the `search` output format for the homepage
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if( window.index_json_url && !window.index_js_url ){
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xhr = new XMLHttpRequest;
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xhr.onreadystatechange = function(){
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if( xhr.readyState == 4 ){
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if( xhr.status == 200 ){
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initLunrIndex( JSON.parse( xhr.responseText ) );
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}
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else{
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var err = xhr.status;
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console.error( 'Error getting Hugo index file: ', err );
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}
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}
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}
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xhr.open( 'GET', index_json_url );
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xhr.send();
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}
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}
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function initLunrJs() {
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// new way to load our search index
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if( window.index_js_url ){
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var js = document.createElement("script");
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js.src = index_js_url;
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js.setAttribute("async", "");
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js.onload = function(){
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initLunrIndex(relearn_search_index);
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};
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js.onerror = function(e){
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console.error('Error getting Hugo index file');
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};
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document.head.appendChild(js);
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}
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}
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/**
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* Trigger a search in Lunr and transform the result
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*
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* @param {String} term
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* @return {Array} results
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*/
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function search(term) {
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// Find the item in our index corresponding to the Lunr one to have more info
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// Remove Lunr special search characters: https://lunrjs.com/guides/searching.html
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term = term.replace( /[*:^~+-]/g, ' ' );
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var searchTerm = lunr.tokenizer( term ).reduce( function(a,token){return a.concat(searchPatterns(token.str))}, []).join(' ');
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return !searchTerm || !lunrIndex ? [] : lunrIndex.search(searchTerm).map(function(result) {
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return { index: result.ref, matches: Object.keys(result.matchData.metadata) }
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});
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}
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function searchPatterns(word) {
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// for short words high amounts of typos doesn't make sense
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// for long words we allow less typos because this largly increases search time
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var typos = [
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{ len: -1, typos: 1 },
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{ len: 60, typos: 2 },
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{ len: 40, typos: 3 },
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{ len: 20, typos: 4 },
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{ len: 16, typos: 3 },
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{ len: 12, typos: 2 },
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{ len: 8, typos: 1 },
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{ len: 4, typos: 0 },
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];
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return [
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word + '^100',
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word + '*^10',
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'*' + word + '^10',
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word + '~' + typos.reduce( function( a, c, i ){ return word.length < c.len ? c : a; } ).typos + '^1'
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];
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}
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function resolvePlaceholders( s, args ) {
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var args = args || [];
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// use replace to iterate over the string
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// select the match and check if the related argument is present
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// if yes, replace the match with the argument
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return s.replace(/{([0-9]+)}/g, function (match, index) {
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// check if the argument is present
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return typeof args[index] == 'undefined' ? match : args[index];
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});
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};
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function searchDetail( value ) {
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var results = document.querySelector('#R-searchresults');
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var hint = document.querySelector('.searchhint');
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hint.innerText = '';
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results.textContent = '';
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var a = search( value );
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if( a.length ){
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hint.innerText = resolvePlaceholders( window.T_N_results_found, [ value, a.length ] );
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a.forEach( function(item){
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var page = pagesIndex[item.index];
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var numContextWords = 10;
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var contextPattern = '(?:\\S+ +){0,' + numContextWords + '}\\S*\\b(?:' +
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item.matches.map( function(match){return match.replace(/\W/g, '\\$&')} ).join('|') +
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')\\b\\S*(?: +\\S+){0,' + numContextWords + '}';
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var context = page.content.match(new RegExp(contextPattern, 'i'));
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var divsuggestion = document.createElement('a');
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divsuggestion.className = 'autocomplete-suggestion';
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divsuggestion.setAttribute('data-term', value);
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divsuggestion.setAttribute('data-title', page.title);
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divsuggestion.setAttribute('href', window.relearn.relBaseUri + page.uri);
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divsuggestion.setAttribute('data-context', context);
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var divtitle = document.createElement('div');
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divtitle.className = 'title';
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divtitle.innerText = '» ' + page.title;
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divsuggestion.appendChild( divtitle );
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var divbreadcrumb = document.createElement('div');
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divbreadcrumb.className = 'breadcrumbs';
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divbreadcrumb.innerText = (page.breadcrumb || '');
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divsuggestion.appendChild( divbreadcrumb );
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if( context ){
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var divcontext = document.createElement('div');
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divcontext.className = 'context';
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divcontext.innerText = (context || '');
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divsuggestion.appendChild( divcontext );
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}
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results.appendChild( divsuggestion );
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});
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window.relearn.markSearch();
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}
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else if( value.length ) {
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hint.innerText = resolvePlaceholders( window.T_No_results_found, [ value ] );
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}
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input.focus();
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setTimeout( adjustContentWidth, 0 );
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// if we are initiating search because of a browser history
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// operation, we have to restore the scrolling postion the
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// user previously has used; if this search isn't initiated
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// by a browser history operation, it simply does nothing
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var state = window.history.state || {};
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state = Object.assign( {}, ( typeof state === 'object' ) ? state : {} );
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if( state.hasOwnProperty( 'contentScrollTop' ) ){
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window.setTimeout( function(){
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elc.scrollTop = +state.contentScrollTop;
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}, 10 );
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return;
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}
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}
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initLunrJson();
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initLunrJs();
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function startSearch(){
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var input = document.querySelector('#R-search-by-detail');
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if( input ){
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var state = window.history.state || {};
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state = Object.assign( {}, ( typeof state === 'object' ) ? state : {} );
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state.search = window.location.toString();
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window.history.replaceState( state, '', window.location );
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}
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var searchList = new autoComplete({
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/* selector for the search box element */
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selectorToInsert: '#R-header-wrapper',
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selector: '#R-search-by',
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/* source is the callback to perform the search */
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source: function(term, response) {
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response(search(term));
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},
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/* renderItem displays individual search results */
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renderItem: function(item, term) {
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var page = pagesIndex[item.index];
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var numContextWords = 2;
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var contextPattern = '(?:\\S+ +){0,' + numContextWords + '}\\S*\\b(?:' +
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item.matches.map( function(match){return match.replace(/\W/g, '\\$&')} ).join('|') +
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')\\b\\S*(?: +\\S+){0,' + numContextWords + '}';
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var context = page.content.match(new RegExp(contextPattern, 'i'));
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var divsuggestion = document.createElement('div');
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divsuggestion.className = 'autocomplete-suggestion';
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divsuggestion.setAttribute('data-term', term);
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divsuggestion.setAttribute('data-title', page.title);
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divsuggestion.setAttribute('data-uri', window.relearn.relBaseUri + page.uri);
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divsuggestion.setAttribute('data-context', context);
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var divtitle = document.createElement('div');
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divtitle.className = 'title';
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divtitle.innerText = '» ' + page.title;
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divsuggestion.appendChild( divtitle );
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if( context ){
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var divcontext = document.createElement('div');
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divcontext.className = 'context';
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divcontext.innerText = (context || '');
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divsuggestion.appendChild( divcontext );
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}
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return divsuggestion.outerHTML;
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},
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/* onSelect callback fires when a search suggestion is chosen */
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onSelect: function(e, term, item) {
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location.href = item.getAttribute('data-uri');
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e.preventDefault();
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}
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});
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};
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ready( startSearch );
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