ar.falsy.cat/assets/js/search.js
2022-05-02 09:04:36 -07:00

264 lines
7.1 KiB
JavaScript

// code from https://github.com/danestves/markdown-to-text
const removeMarkdown = (
markdown,
options = {
listUnicodeChar: false,
stripListLeaders: true,
gfm: true,
useImgAltText: false,
preserveLinks: false,
}
) => {
let output = markdown || '';
output = output.replace(/^(-\s*?|\*\s*?|_\s*?){3,}\s*$/gm, '');
try {
if (options.stripListLeaders) {
if (options.listUnicodeChar)
output = output.replace(
/^([\s\t]*)([\*\-\+]|\d+\.)\s+/gm,
options.listUnicodeChar + ' $1'
);
else output = output.replace(/^([\s\t]*)([\*\-\+]|\d+\.)\s+/gm, '$1');
}
if (options.gfm) {
output = output
.replace(/\n={2,}/g, '\n')
.replace(/~{3}.*\n/g, '')
.replace(/~~/g, '')
.replace(/`{3}.*\n/g, '');
}
if (options.preserveLinks) {
output = output.replace(/\[(.*?)\][\[\(](.*?)[\]\)]/g, '$1 ($2)');
}
output = output
.replace(/<[^>]*>/g, '')
.replace(/^[=\-]{2,}\s*$/g, '')
.replace(/\[\^.+?\](\: .*?$)?/g, '')
.replace(/\s{0,2}\[.*?\]: .*?$/g, '')
.replace(/\!\[(.*?)\][\[\(].*?[\]\)]/g, options.useImgAltText ? '$1' : '')
.replace(/\[(.*?)\][\[\(].*?[\]\)]/g, '$1')
.replace(/^\s{0,3}>\s?/g, '')
.replace(/(^|\n)\s{0,3}>\s?/g, '\n\n')
.replace(/^\s{1,2}\[(.*?)\]: (\S+)( ".*?")?\s*$/g, '')
.replace(
/^(\n)?\s{0,}#{1,6}\s+| {0,}(\n)?\s{0,}#{0,} {0,}(\n)?\s{0,}$/gm,
'$1$2$3'
)
.replace(/([\*_]{1,3})(\S.*?\S{0,1})\1/g, '$2')
.replace(/([\*_]{1,3})(\S.*?\S{0,1})\1/g, '$2')
.replace(/(`{3,})(.*?)\1/gm, '$2')
.replace(/`(.+?)`/g, '$1')
.replace(/\n{2,}/g, '\n\n');
} catch (e) {
console.error(e);
return markdown;
}
return output;
};
// -----
(async function () {
const encoder = (str) => str.toLowerCase().split(/([^a-z]|[^\x00-\x7F])+/);
const contentIndex = new FlexSearch.Document({
cache: true,
charset: 'latin:extra',
optimize: true,
index: [
{
field: 'content',
tokenize: 'reverse',
encode: encoder,
},
{
field: 'title',
tokenize: 'forward',
encode: encoder,
},
],
});
const { content } = await fetchData;
for (const [key, value] of Object.entries(content)) {
contentIndex.add({
id: key,
title: value.title,
content: removeMarkdown(value.content),
});
}
const highlight = (content, term) => {
const highlightWindow = 20;
const tokenizedTerm = term.split(/\s+/).filter((t) => t !== '');
const splitText = content.split(/\s+/).filter((t) => t !== '');
const includesCheck = (token) =>
tokenizedTerm.some((term) =>
token.toLowerCase().startsWith(term.toLowerCase())
);
const occurrencesIndices = splitText.map(includesCheck);
// calculate best index
let bestSum = 0;
let bestIndex = 0;
for (
let i = 0;
i < Math.max(occurrencesIndices.length - highlightWindow, 0);
i++
) {
const window = occurrencesIndices.slice(i, i + highlightWindow);
const windowSum = window.reduce((total, cur) => total + cur, 0);
if (windowSum >= bestSum) {
bestSum = windowSum;
bestIndex = i;
}
}
const startIndex = Math.max(bestIndex - highlightWindow, 0);
const endIndex = Math.min(
startIndex + 2 * highlightWindow,
splitText.length
);
const mappedText = splitText
.slice(startIndex, endIndex)
.map((token) => {
if (includesCheck(token)) {
return `<span class="search-highlight">${token}</span>`;
}
return token;
})
.join(' ')
.replaceAll('</span> <span class="search-highlight">', ' ');
return `${startIndex === 0 ? '' : '...'}${mappedText}${
endIndex === splitText.length ? '' : '...'
}`;
};
const resultToHTML = ({ url, title, content, term }) => {
const text = removeMarkdown(content);
const resultTitle = highlight(title, term);
const resultText = highlight(text, term);
return `<button class="result-card" id="${url}">
<h3>${resultTitle}</h3>
<p>${resultText}</p>
</button>`;
};
const redir = (id, term) => {
// SPA navigation
window.navigate(
new URL(
`${BASE_URL.slice(0, -1)}${id}#:~:text=${encodeURIComponent(term)}/`
),
'.singlePage'
);
closeSearch();
};
const formatForDisplay = (id) => ({
id,
url: id,
title: content[id].title,
content: content[id].content,
});
const source = document.getElementById('search-bar');
const results = document.getElementById('results-container');
let term;
source.addEventListener('keyup', (e) => {
if (e.key === 'Enter') {
const anchor = document.getElementsByClassName('result-card')[0];
redir(anchor.id, term);
}
});
source.addEventListener('input', (e) => {
term = e.target.value;
const searchResults = contentIndex.search(term, [
{
field: 'content',
limit: 10,
},
{
field: 'title',
limit: 5,
},
]);
const getByField = (field) => {
const results = searchResults.filter((x) => x.field === field);
if (results.length === 0) {
return [];
} else {
return [...results[0].result];
}
};
const allIds = new Set([...getByField('title'), ...getByField('content')]);
const finalResults = [...allIds].map(formatForDisplay);
// display
if (finalResults.length === 0) {
results.innerHTML = `<button class="result-card">
<h3>No results.</h3>
<p>Try another search term?</p>
</button>`;
} else {
results.innerHTML = finalResults
.map((result) =>
resultToHTML({
...result,
term,
})
)
.join('\n');
const anchors = document.getElementsByClassName('result-card');
[...anchors].forEach((anchor) => {
anchor.onclick = () => redir(anchor.id, term);
});
}
});
const searchContainer = document.getElementById('search-container');
function openSearch() {
if (
searchContainer.style.display === 'none' ||
searchContainer.style.display === ''
) {
source.value = '';
results.innerHTML = '';
searchContainer.style.display = 'block';
source.focus();
} else {
searchContainer.style.display = 'none';
}
}
function closeSearch() {
searchContainer.style.display = 'none';
}
document.addEventListener('keydown', (event) => {
if (event.key === 'k' && (event.ctrlKey || event.metaKey)) {
event.preventDefault();
openSearch();
}
if (event.key === 'Escape') {
event.preventDefault();
closeSearch();
}
});
const searchButton = document.getElementById('search-icon');
searchButton.addEventListener('click', (evt) => {
openSearch();
});
searchButton.addEventListener('keydown', (evt) => {
openSearch();
});
searchContainer.addEventListener('click', (evt) => {
closeSearch();
});
document.getElementById('search-space').addEventListener('click', (evt) => {
evt.stopPropagation();
});
})();