From 651bfc5cd284a259f429b50839c619dd1b94498a Mon Sep 17 00:00:00 2001
From: Jacky Zhao <j.zhao2k19@gmail.com>
Date: Mon, 07 Mar 2022 18:45:07 +0000
Subject: [PATCH] Merge pull request #62 from claudio4/hugo
---
assets/js/search.js | 247 +++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 247 insertions(+), 0 deletions(-)
diff --git a/assets/js/search.js b/assets/js/search.js
new file mode 100644
index 0000000..34b7b62
--- /dev/null
+++ b/assets/js/search.js
@@ -0,0 +1,247 @@
+// 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, "$1")
+ .replace(/\n{2,}/g, "\n\n");
+ } catch (e) {
+ console.error(e);
+ return markdown;
+ }
+ return output;
+};
+// -----
+
+(async function () {
+ const contentIndex = new FlexSearch.Document({
+ cache: true,
+ charset: "latin:extra",
+ optimize: true,
+ worker: true,
+ document: {
+ index: [{
+ field: "content",
+ tokenize: "strict",
+ context: {
+ resolution: 5,
+ depth: 3,
+ bidirectional: true
+ },
+ suggest: true,
+ }, {
+ field: "title",
+ tokenize: "forward",
+ }]
+ }
+ })
+
+ const { content } = await fetchData
+ for (const [key, value] of Object.entries(content)) {
+ contentIndex.add({
+ id: key,
+ title: value.title,
+ content: removeMarkdown(value.content),
+ })
+ }
+
+ const highlight = (content, term) => {
+ const highlightWindow = 20
+ const tokenizedTerm = term.split(/\s+/).filter(t => t !== "")
+ const splitText = content.split(/\s+/).filter(t => t !== "")
+ const includesCheck = (token) => tokenizedTerm.some(term => token.toLowerCase().startsWith(term.toLowerCase()))
+
+ const occurrencesIndices = splitText
+ .map(includesCheck)
+
+ // calculate best index
+ let bestSum = 0
+ let bestIndex = 0
+ for (let i = 0; i < Math.max(occurrencesIndices.length - highlightWindow, 0); i++) {
+ const window = occurrencesIndices.slice(i, i + highlightWindow)
+ const windowSum = window.reduce((total, cur) => total + cur, 0)
+ if (windowSum >= bestSum) {
+ bestSum = windowSum
+ bestIndex = i
+ }
+ }
+
+ const startIndex = Math.max(bestIndex - highlightWindow, 0)
+ const endIndex = Math.min(startIndex + 2 * highlightWindow, splitText.length)
+ const mappedText = splitText
+ .slice(startIndex, endIndex)
+ .map(token => {
+ if (includesCheck(token)) {
+ return `<span class="search-highlight">${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) => {
+ window.location.href = BASE_URL + `${id}#:~:text=${encodeURIComponent(term)}`
+ }
+
+ 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
+ contentIndex.search(term, [
+ {
+ field: "content",
+ limit: 10,
+ suggest: true,
+ },
+ {
+ field: "title",
+ limit: 5,
+ }
+ ]).then(searchResults => {
+ 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 === "/") {
+ 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()
+ })
+})()
+
--
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