roadmap/quartz/components/scripts/search.inline.ts

183 lines
5.8 KiB
TypeScript

import { Document } from "flexsearch"
import { ContentDetails } from "../../plugins/emitters/contentIndex"
import { registerEscapeHandler, relative, removeAllChildren } from "./util"
interface Item {
slug: string,
title: string,
content: string,
}
let index: Document<Item> | undefined = undefined
const contextWindowWords = 30
function highlight(searchTerm: string, text: string, trim?: boolean) {
// try to highlight longest tokens first
const tokenizedTerms = searchTerm.split(/\s+/).filter(t => t !== "").sort((a, b) => b.length - a.length)
let tokenizedText = text
.split(/\s+/)
.filter(t => t !== "")
let startIndex = 0
let endIndex = tokenizedText.length - 1
if (trim) {
const includesCheck = (tok: string) => tokenizedTerms.some((term) => tok.toLowerCase().startsWith(term.toLowerCase()))
const occurencesIndices = tokenizedText.map(includesCheck)
let bestSum = 0
let bestIndex = 0
for (let i = 0; i < Math.max(tokenizedText.length - contextWindowWords, 0); i++) {
const window = occurencesIndices.slice(i, i + contextWindowWords)
const windowSum = window.reduce((total, cur) => total + (cur ? 1 : 0), 0)
if (windowSum >= bestSum) {
bestSum = windowSum
bestIndex = i
}
}
startIndex = Math.max(bestIndex - contextWindowWords, 0)
endIndex = Math.min(startIndex + 2 * contextWindowWords, tokenizedText.length - 1)
tokenizedText = tokenizedText.slice(startIndex, endIndex)
}
const slice = tokenizedText.map(tok => {
// see if this tok is prefixed by any search terms
for (const searchTok of tokenizedTerms) {
if (tok.toLowerCase().includes(searchTok.toLowerCase())) {
const regex = new RegExp(searchTok.toLowerCase(), "gi")
return tok.replace(regex, `<span class="highlight">$&</span>`)
}
}
return tok
})
.join(" ")
return `${startIndex === 0 ? "" : "..."}${slice}${endIndex === tokenizedText.length - 1 ? "" : "..."}`
}
const encoder = (str: string) => str.toLowerCase().split(/([^a-z]|[^\x00-\x7F])/)
document.addEventListener("nav", async (e: unknown) => {
const currentSlug = (e as CustomEventMap["nav"]).detail.url
// setup index if it hasn't been already
const data = await fetchData
if (!index) {
index = new Document({
cache: true,
charset: 'latin:extra',
optimize: true,
encode: encoder,
document: {
id: "slug",
index: [
{
field: "title",
tokenize: "forward",
},
{
field: "content",
tokenize: "reverse",
},
]
},
})
for (const [slug, fileData] of Object.entries<ContentDetails>(data)) {
await index.addAsync(slug, {
slug,
title: fileData.title,
content: fileData.content
})
}
}
const container = document.getElementById("search-container")
const searchIcon = document.getElementById("search-icon")
const searchBar = document.getElementById("search-bar") as HTMLInputElement | null
const results = document.getElementById("results-container")
function hideSearch() {
container?.classList.remove("active")
if (searchBar) {
searchBar.value = "" // clear the input when we dismiss the search
}
if (results) {
removeAllChildren(results)
}
}
function showSearch() {
container?.classList.add("active")
searchBar?.focus()
}
function shortcutHandler(e: HTMLElementEventMap["keydown"]) {
if (e.key === "k" && (e.ctrlKey || e.metaKey)) {
e.preventDefault()
const searchBarOpen = container?.classList.contains("active")
searchBarOpen ? hideSearch() : showSearch()
} else if (e.key === "Enter") {
const anchor = document.getElementsByClassName("result-card")[0] as HTMLInputElement | null
if (anchor) {
anchor.click()
}
}
}
const formatForDisplay = (term: string, slug: string) => ({
slug,
title: highlight(term, data[slug].title ?? ""),
content: highlight(term, data[slug].content ?? "", true),
})
const resultToHTML = ({ slug, title, content }: Item) => {
const button = document.createElement("button")
button.classList.add("result-card")
button.id = slug
button.innerHTML = `<h3>${title}</h3><p>${content}</p>`
button.addEventListener('click', () => {
const targ = relative(currentSlug, slug)
window.spaNavigate(new URL(targ))
})
return button
}
function displayResults(finalResults: Item[]) {
if (!results) return
removeAllChildren(results)
if (finalResults.length === 0) {
results.innerHTML = `<button class="result-card">
<h3>No results.</h3>
<p>Try another search term?</p>
</button>`
} else {
results.append(...finalResults.map(resultToHTML))
}
}
function onType(e: HTMLElementEventMap["input"]) {
const term = (e.target as HTMLInputElement).value
const searchResults = index?.search(term, 5) ?? []
const getByField = (field: string): string[] => {
const results = searchResults.filter((x) => x.field === field)
return results.length === 0 ? [] : [...results[0].result] as string[]
}
// order titles ahead of content
const allIds: Set<string> = new Set([...getByField("title"), ...getByField("content")])
const finalResults = [...allIds].map(id => formatForDisplay(term, id))
displayResults(finalResults)
}
document.removeEventListener("keydown", shortcutHandler)
document.addEventListener("keydown", shortcutHandler)
searchIcon?.removeEventListener("click", showSearch)
searchIcon?.addEventListener("click", showSearch)
searchBar?.removeEventListener("input", onType)
searchBar?.addEventListener("input", onType)
// register handlers
registerEscapeHandler(container, hideSearch)
})