quartz-research-note/quartz/path.ts

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import { slug as slugAnchor } from 'github-slugger'
import { trace } from './trace'
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// Quartz Paths
// Things in boxes are not actual types but rather sources which these types can be acquired from
//
// ┌────────────┐
// ┌───────────┤ Browser ├────────────┐
// │ └────────────┘ │
// │ │
// ▼ ▼
// ┌────────┐ ┌─────────────┐
// ┌───────────────────┤ Window │ │ LinkElement │
// │ └────┬───┘ └──────┬──────┘
// │ │ │
// │ getClientSlug() │ .href │
// │ ▼ ▼
// │
// │ Client Slug ┌───► Relative URL
// getCanonicalSlug() │ https://test.ca/note/abc#anchor?query=123 │ ../note/def#anchor
// │ │
// │ canonicalizeClient() │ │ ▲ ▲
// │ ▼ │ │ │
// │ pathToRoot() │ │ │
// └───────────────► Canonical Slug ────────────────┘ │ │
// note/abc │ │
// ──────────────────────────┘ │
// ▲ resolveRelative() │
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// canonicalizeServer() │ │
// │
// HTML File Server Slug │
// note/abc/index.html ◄───────────── note/abc/index │
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// │
// ▲ ┌────────┴────────┐
// slugifyFilePath() │ transformLink() │ │
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// │ │ │
// ┌─────────┴──────────┐ ┌─────┴─────┐ ┌────────┴──────┐
// │ File Path │ │ Wikilinks │ │ Markdown Link │
// │ note/abc/index.md │ └───────────┘ └───────────────┘
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// └────────────────────┘ ▲ ▲
// ▲ │ │
// │ ┌─────────┐ │ │
// └────────────┤ MD File ├─────┴─────────────────┘
// └─────────┘
const STRICT_TYPE_CHECKS = true
const HARD_EXIT_ON_FAIL = true
function conditionCheck<T>(name: string, label: 'pre' | 'post', s: T, chk: (x: any) => x is T) {
if (STRICT_TYPE_CHECKS && !chk(s)) {
trace(`${name} failed ${label}-condition check: ${s} does not pass ${chk.name}`, new Error())
if (HARD_EXIT_ON_FAIL) {
process.exit(1)
}
}
}
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/// Utility type to simulate nominal types in TypeScript
type SlugLike<T> = string & { __brand: T }
/** Client-side slug, usually obtained through `window.location` */
export type ClientSlug = SlugLike<"client">
export function isClientSlug(s: string): s is ClientSlug {
const res = /^https?:\/\/.+/.test(s)
return res
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}
/** Canonical slug, should be used whenever you need to refer to the location of a file/note.
* On the client, this is normally stored in `document.body.dataset.slug`
*/
export type CanonicalSlug = SlugLike<"canonical">
export function isCanonicalSlug(s: string): s is CanonicalSlug {
const validStart = !(s.startsWith(".") || s.startsWith("/"))
const validEnding = !(s.endsWith("/") || s.endsWith("/index") || s === "index")
return validStart && !_containsForbiddenCharacters(s) && validEnding && !_hasFileExtension(s)
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}
/** A relative link, can be found on `href`s but can also be constructed for
* client-side navigation (e.g. search and graph)
*/
export type RelativeURL = SlugLike<"relative">
export function isRelativeURL(s: string): s is RelativeURL {
const validStart = /^\.{1,2}/.test(s)
const validEnding = !(s.endsWith("/") || s.endsWith("/index") || s === "index")
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return validStart && validEnding && !_hasFileExtension(s)
}
/** A server side slug. This is what Quartz uses to emit files so uses index suffixes */
export type ServerSlug = SlugLike<"server">
export function isServerSlug(s: string): s is ServerSlug {
const validStart = !(s.startsWith(".") || s.startsWith("/"))
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const validEnding = !s.endsWith("/")
return validStart && validEnding && !_containsForbiddenCharacters(s) && !_hasFileExtension(s)
}
/** The real file path to a file on disk */
export type FilePath = SlugLike<"filepath">
export function isFilePath(s: string): s is FilePath {
const validStart = !s.startsWith(".")
return validStart && _hasFileExtension(s)
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}
export function getClientSlug(window: Window): ClientSlug {
const res = window.location.href as ClientSlug
conditionCheck(getClientSlug.name, 'post', res, isClientSlug)
return res
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}
export function getCanonicalSlug(window: Window): CanonicalSlug {
const res = window.document.body.dataset.slug! as CanonicalSlug
conditionCheck(getCanonicalSlug.name, 'post', res, isCanonicalSlug)
return res
}
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export function canonicalizeClient(slug: ClientSlug): CanonicalSlug {
conditionCheck(canonicalizeClient.name, 'pre', slug, isClientSlug)
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const { pathname } = new URL(slug)
let fp = pathname.slice(1)
fp = fp.replace(new RegExp(_getFileExtension(fp) + '$'), '')
const res = _canonicalize(fp) as CanonicalSlug
conditionCheck(canonicalizeClient.name, 'post', res, isCanonicalSlug)
return res
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}
export function canonicalizeServer(slug: ServerSlug): CanonicalSlug {
conditionCheck(canonicalizeServer.name, 'pre', slug, isServerSlug)
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let fp = slug as string
const res = _canonicalize(fp) as CanonicalSlug
conditionCheck(canonicalizeServer.name, 'post', res, isCanonicalSlug)
return res
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}
export function slugifyFilePath(fp: FilePath): ServerSlug {
conditionCheck(slugifyFilePath.name, 'pre', fp, isFilePath)
fp = _stripSlashes(fp) as FilePath
const withoutFileExt = fp.replace(new RegExp(_getFileExtension(fp) + '$'), '')
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const slug = withoutFileExt
.split('/')
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.map((segment) => segment.replace(/\s/g, '-')) // slugify all segments
.join('/') // always use / as sep
.replace(/\/$/, '') // remove trailing slash
conditionCheck(slugifyFilePath.name, 'post', slug, isServerSlug)
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return slug as ServerSlug
}
export function transformInternalLink(link: string): RelativeURL {
let [fplike, anchor] = splitAnchor(decodeURI(link))
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let segments = fplike.split("/").filter(x => x.length > 0)
let prefix = segments.filter(_isRelativeSegment).join("/")
let fp = segments.filter(seg => !_isRelativeSegment(seg)).join("/")
// implicit markdown
if (!_hasFileExtension(fp)) {
fp += ".md"
}
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fp = canonicalizeServer(slugifyFilePath(fp as FilePath))
if (fp.endsWith("index")) {
fp = fp.slice(0, -"index".length)
}
let joined = joinSegments(_stripSlashes(prefix), _stripSlashes(fp))
const res = _addRelativeToStart(joined) + anchor as RelativeURL
conditionCheck(transformInternalLink.name, 'post', res, isRelativeURL)
return res
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}
// resolve /a/b/c to ../../
export function pathToRoot(slug: CanonicalSlug): RelativeURL {
conditionCheck(pathToRoot.name, 'pre', slug, isCanonicalSlug)
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let rootPath = slug
.split('/')
.filter(x => x !== '')
.map(_ => '..')
.join('/')
const res = _addRelativeToStart(rootPath) as RelativeURL
conditionCheck(pathToRoot.name, 'post', res, isRelativeURL)
return res
}
export function resolveRelative(current: CanonicalSlug, target: CanonicalSlug): RelativeURL {
conditionCheck(resolveRelative.name, 'pre', current, isCanonicalSlug)
conditionCheck(resolveRelative.name, 'pre', target, isCanonicalSlug)
const res = joinSegments(pathToRoot(current), target) as RelativeURL
conditionCheck(resolveRelative.name, 'post', res, isRelativeURL)
return res
}
export function splitAnchor(link: string): [string, string] {
let [fp, anchor] = link.split("#", 2)
anchor = anchor === undefined ? "" : '#' + slugAnchor(anchor)
return [fp, anchor]
}
export function joinSegments(...args: string[]): string {
return args.filter(segment => segment !== "").join('/')
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}
export const QUARTZ = "quartz"
function _canonicalize(fp: string): string {
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if (fp.endsWith("index")) {
fp = fp.slice(0, -"index".length)
}
return _stripSlashes(fp)
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}
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function _containsForbiddenCharacters(s: string): boolean {
return s.includes(" ") || s.includes("#") || s.includes("?")
}
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function _hasFileExtension(s: string): boolean {
return _getFileExtension(s) !== undefined
}
function _getFileExtension(s: string): string | undefined {
return s.match(/\.[A-Za-z]+$/)?.[0]
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}
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function _isRelativeSegment(s: string): boolean {
return /^\.{0,2}$/.test(s)
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}
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function _stripSlashes(s: string): string {
if (s.startsWith("/")) {
s = s.substring(1)
}
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if (s.endsWith("/")) {
s = s.slice(0, -1)
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}
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return s
}
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function _addRelativeToStart(s: string): string {
if (s === "") {
s = "."
}
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if (!s.startsWith(".")) {
s = joinSegments(".", s)
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}
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return s
}