hugo-theme-relearn/static/js/search.js
2023-01-30 17:59:28 +01:00

251 lines
8.8 KiB
JavaScript

window.relearn = window.relearn || {};
window.relearn.runInitialSearch = function(){
if( window.relearn.isSearchInit && window.relearn.isLunrInit ){
searchDetail();
}
}
var lunrIndex, pagesIndex;
function initLunrIndex( index ){
pagesIndex = index;
// Set up Lunr by declaring the fields we use
// Also provide their boost level for the ranking
lunrIndex = lunr(function() {
this.use(lunr.multiLanguage.apply(null, contentLangs));
this.ref('index');
this.field('title', {
boost: 15
});
this.field('tags', {
boost: 10
});
this.field('content', {
boost: 5
});
this.pipeline.remove(lunr.stemmer);
this.searchPipeline.remove(lunr.stemmer);
// Feed Lunr with each file and let LUnr actually index them
pagesIndex.forEach(function(page, idx) {
page.index = idx;
this.add(page);
}, this);
});
window.relearn.isLunrInit = true;
window.relearn.runInitialSearch();
}
function triggerSearch(){
searchDetail();
var input = document.querySelector('#search-by-detail');
if( !input ){
return;
}
var value = input.value;
var url = new URL( window.location );
var oldValue = url.searchParams.get('search-by');
if( value != oldValue ){
url.searchParams.set('search-by', value);
window.history.pushState(url.toString(), '', url);
}
}
window.addEventListener('popstate', function ( event ) {
// restart search if browsed thru history
if (event.state && event.state.indexOf('search.html?search-by=') >= 0) {
window.location.reload();
}
});
var input = document.querySelector('#search-by-detail');
if( input ){
input.addEventListener( 'keydown', function(event) {
// if we are pressing ESC in the searchdetail our focus will
// be stolen by the other event handlers, so we have to refocus
// here after a short while
if (event.key == "Escape") {
setTimeout( function(){ input.focus(); }, 0 );
}
});
}
function initLunrJson() {
// old way to load the search index via XHR;
// this does not work if pages are served via
// file:// protocol; this is only left for
// backward compatiblity if the user did not
// define the SEARCH output format for the homepage
if( window.index_json_url && !window.index_js_url ){
xhr = new XMLHttpRequest;
xhr.onreadystatechange = function(){
if( xhr.readyState == 4 ){
if( xhr.status == 200 ){
initLunrIndex( JSON.parse( xhr.responseText ) );
}
else{
var err = xhr.status;
console.error( 'Error getting Hugo index file: ', err );
}
}
}
xhr.open( 'GET', index_json_url );
xhr.send();
}
}
function initLunrJs() {
// new way to load our search index
if( window.index_js_url ){
var js = document.createElement("script");
js.src = index_js_url;
js.setAttribute("async", "");
js.onload = function(){
initLunrIndex(relearn_search_index);
};
js.onerror = function(e){
console.error('Error getting Hugo index file');
};
document.head.appendChild(js);
}
}
/**
* Trigger a search in Lunr and transform the result
*
* @param {String} term
* @return {Array} results
*/
function search(term) {
// Find the item in our index corresponding to the Lunr one to have more info
// Remove Lunr special search characters: https://lunrjs.com/guides/searching.html
var searchTerm = lunr.tokenizer(term.replace(/[*:^~+-]/, ' ')).reduce( function(a,token){return a.concat(searchPatterns(token.str))}, []).join(' ');
return !searchTerm || !lunrIndex ? [] : lunrIndex.search(searchTerm).map(function(result) {
return { index: result.ref, matches: Object.keys(result.matchData.metadata) }
});
}
function searchPatterns(word) {
// for short words high amounts of typos doesn't make sense
// for long words we allow less typos because this largly increases search time
var typos = [
{ len: -1, typos: 1 },
{ len: 60, typos: 2 },
{ len: 40, typos: 3 },
{ len: 20, typos: 4 },
{ len: 16, typos: 3 },
{ len: 12, typos: 2 },
{ len: 8, typos: 1 },
{ len: 4, typos: 0 },
];
return [
word + '^100',
word + '*^10',
'*' + word + '^10',
word + '~' + typos.reduce( function( a, c, i ){ return word.length < c.len ? c : a; } ).typos + '^1'
];
}
function resolvePlaceholders( s, args ) {
var args = args || [];
// use replace to iterate over the string
// select the match and check if the related argument is present
// if yes, replace the match with the argument
return s.replace(/{([0-9]+)}/g, function (match, index) {
// check if the argument is present
return typeof args[index] == 'undefined' ? match : args[index];
});
};
function searchDetail() {
var input = document.querySelector('#search-by-detail');
if( !input ){
return;
}
var value = input.value;
var results = document.querySelector('#searchresults');
var hint = document.querySelector('.searchhint');
hint.innerText = '';
results.textContent = '';
var a = search( value );
if( a.length ){
hint.innerText = resolvePlaceholders( window.T_N_results_found, [ value, a.length ] );
a.forEach( function(item){
var page = pagesIndex[item.index];
var numContextWords = 10;
var contextPattern = '(?:\\S+ +){0,' + numContextWords + '}\\S*\\b(?:' +
item.matches.map( function(match){return match.replace(/\W/g, '\\$&')} ).join('|') +
')\\b\\S*(?: +\\S+){0,' + numContextWords + '}';
var context = page.content.match(new RegExp(contextPattern, 'i'));
var divcontext = document.createElement('div');
divcontext.className = 'context';
divcontext.innerText = (context || '');
var divsuggestion = document.createElement('a');
divsuggestion.className = 'autocomplete-suggestion';
divsuggestion.setAttribute('data-term', value);
divsuggestion.setAttribute('data-title', page.title);
divsuggestion.setAttribute('href', baseUri + page.uri);
divsuggestion.setAttribute('data-context', context);
divsuggestion.innerText = '» ' + page.title;
divsuggestion.appendChild(divcontext);
results.appendChild( divsuggestion );
});
window.relearn.markSearch();
}
else if( value.length ) {
hint.innerText = resolvePlaceholders( window.T_No_results_found, [ value ] );
}
input.focus();
setTimeout( adjustContentWidth, 0 );
}
initLunrJson();
initLunrJs();
function startSearch(){
var url = new URL( window.location );
window.history.replaceState(url.toString(), '', url);
var searchList = new autoComplete({
/* selector for the search box element */
selectorToInsert: '#header-wrapper',
selector: '#search-by',
/* source is the callback to perform the search */
source: function(term, response) {
response(search(term));
},
/* renderItem displays individual search results */
renderItem: function(item, term) {
var page = pagesIndex[item.index];
var numContextWords = 2;
var contextPattern = '(?:\\S+ +){0,' + numContextWords + '}\\S*\\b(?:' +
item.matches.map( function(match){return match.replace(/\W/g, '\\$&')} ).join('|') +
')\\b\\S*(?: +\\S+){0,' + numContextWords + '}';
var context = page.content.match(new RegExp(contextPattern, 'i'));
var divcontext = document.createElement('div');
divcontext.className = 'context';
divcontext.innerText = (context || '');
var divsuggestion = document.createElement('div');
divsuggestion.className = 'autocomplete-suggestion';
divsuggestion.setAttribute('data-term', term);
divsuggestion.setAttribute('data-title', page.title);
divsuggestion.setAttribute('data-uri', baseUri + page.uri);
divsuggestion.setAttribute('data-context', context);
divsuggestion.innerText = '» ' + page.title;
divsuggestion.appendChild(divcontext);
return divsuggestion.outerHTML;
},
/* onSelect callback fires when a search suggestion is chosen */
onSelect: function(e, term, item) {
location.href = item.getAttribute('data-uri');
e.preventDefault();
}
});
};
ready( startSearch );