roadmap/quartz/components/Breadcrumbs.tsx

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import { QuartzComponentConstructor, QuartzComponentProps } from "./types"
import breadcrumbsStyle from "./styles/breadcrumbs.scss"
import { FullSlug, SimpleSlug, resolveRelative } from "../util/path"
import { QuartzPluginData } from "../plugins/vfile"
type CrumbData = {
displayName: string
path: string
}
interface BreadcrumbOptions {
/**
* Symbol between crumbs
*/
spacerSymbol: string
/**
* Name of first crumb
*/
rootName: string
/**
* wether to look up frontmatter title for folders (could cause performance problems with big vaults)
*/
resolveFrontmatterTitle: boolean
/**
* Wether to display breadcrumbs on root `index.md`
*/
hideOnRoot: boolean
}
const defaultOptions: BreadcrumbOptions = {
spacerSymbol: ">",
rootName: "Home",
resolveFrontmatterTitle: false,
hideOnRoot: true,
}
function formatCrumb(displayName: string, baseSlug: FullSlug, currentSlug: SimpleSlug): CrumbData {
return {
displayName: displayName.replaceAll("-", " "),
path: resolveRelative(baseSlug, currentSlug),
}
}
// given a folderName (e.g. "features"), search for the corresponding `index.md` file
function findCurrentFile(allFiles: QuartzPluginData[], folderName: string) {
return allFiles.find((file) => {
if (file.slug?.endsWith("index")) {
const folderParts = file.filePath?.split("/")
if (folderParts) {
const name = folderParts[folderParts?.length - 2]
if (name === folderName) {
return true
}
}
}
})
}
export default ((opts?: Partial<BreadcrumbOptions>) => {
// Merge options with defaults
const options: BreadcrumbOptions = { ...defaultOptions, ...opts }
function Breadcrumbs({ fileData, allFiles, displayClass }: QuartzComponentProps) {
// Hide crumbs on root if enabled
if (options.hideOnRoot && fileData.slug === "index") {
return <></>
}
// Format entry for root element
const firstEntry = formatCrumb(options.rootName, fileData.slug!, "/" as SimpleSlug)
const crumbs: CrumbData[] = [firstEntry]
// Split slug into hierarchy/parts
const slugParts = fileData.slug?.split("/")
if (slugParts) {
// full path until current part
let currentPath = ""
for (let i = 0; i < slugParts.length - 1; i++) {
let currentTitle = slugParts[i]
// TODO: performance optimizations/memoizing
// Try to resolve frontmatter folder title
if (options?.resolveFrontmatterTitle) {
// try to find file for current path
const currentFile = findCurrentFile(allFiles, currentTitle)
if (currentFile) {
currentTitle = currentFile.frontmatter!.title
}
}
// Add current slug to full path
currentPath += slugParts[i] + "/"
// Format and add current crumb
const crumb = formatCrumb(currentTitle, fileData.slug!, currentPath as SimpleSlug)
crumbs.push(crumb)
}
// Add current file to crumb (can directly use frontmatter title)
crumbs.push({
displayName: fileData.frontmatter!.title,
path: "",
})
}
return (
<nav class={`breadcrumb-container ${displayClass ?? ""}`} aria-label="breadcrumbs">
{crumbs.map((crumb, index) => (
<div class="breadcrumb-element">
<a href={crumb.path}>{crumb.displayName}</a>
{index !== crumbs.length - 1 && <p>{` ${options.spacerSymbol} `}</p>}
</div>
))}
</nav>
)
}
Breadcrumbs.css = breadcrumbsStyle
return Breadcrumbs
}) satisfies QuartzComponentConstructor