roadmap/quartz/util/path.ts

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import { slug } from "github-slugger"
// this file must be isomorphic so it can't use node libs (e.g. path)
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export const QUARTZ = "quartz"
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/// Utility type to simulate nominal types in TypeScript
type SlugLike<T> = string & { __brand: T }
/** Cannot be relative and must have a file extension. */
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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}
/** Cannot be relative and may not have leading or trailing slashes. It can have `index` as it's last segment. Use this wherever possible is it's the most 'general' interpretation of a slug. */
export type FullSlug = SlugLike<"full">
export function isFullSlug(s: string): s is FullSlug {
const validStart = !(s.startsWith(".") || s.startsWith("/"))
const validEnding = !s.endsWith("/")
return validStart && validEnding && !_containsForbiddenCharacters(s)
}
/** Shouldn't be a relative path and shouldn't have `/index` as an ending or a file extension. It _can_ however have a trailing slash to indicate a folder path. */
export type SimpleSlug = SlugLike<"simple">
export function isSimpleSlug(s: string): s is SimpleSlug {
const validStart = !(s.startsWith(".") || s.startsWith("/"))
const validEnding = !(s.endsWith("/index") || s === "index")
return validStart && !_containsForbiddenCharacters(s) && validEnding && !_hasFileExtension(s)
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}
/** Can be found on `href`s but can also be constructed for client-side navigation (e.g. search and graph) */
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export type RelativeURL = SlugLike<"relative">
export function isRelativeURL(s: string): s is RelativeURL {
const validStart = /^\.{1,2}/.test(s)
const validEnding = !(s.endsWith("/index") || s === "index")
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return validStart && validEnding && ![".md", ".html"].includes(_getFileExtension(s) ?? "")
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}
export function getFullSlug(window: Window): FullSlug {
const res = window.document.body.dataset.slug! as FullSlug
return res
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}
export function slugifyFilePath(fp: FilePath, excludeExt?: boolean): FullSlug {
fp = _stripSlashes(fp) as FilePath
let ext = _getFileExtension(fp)
const withoutFileExt = fp.replace(new RegExp(ext + "$"), "")
if (excludeExt || [".md", ".html", undefined].includes(ext)) {
ext = ""
}
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let slug = withoutFileExt
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.split("/")
.map((segment) => segment.replace(/\s/g, "-").replace(/%/g, "-percent")) // slugify all segments
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.join("/") // always use / as sep
.replace(/\/$/, "") // remove trailing slash
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// treat _index as index
if (_endsWith(slug, "_index")) {
slug = slug.replace(/_index$/, "index")
}
return (slug + ext) as FullSlug
}
export function simplifySlug(fp: FullSlug): SimpleSlug {
return _stripSlashes(_trimSuffix(fp, "index"), true) as SimpleSlug
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}
export function transformInternalLink(link: string): RelativeURL {
let [fplike, anchor] = splitAnchor(decodeURI(link))
const folderPath = _isFolderPath(fplike)
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let segments = fplike.split("/").filter((x) => x.length > 0)
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let prefix = segments.filter(_isRelativeSegment).join("/")
let fp = segments.filter((seg) => !_isRelativeSegment(seg) && seg !== "").join("/")
// manually add ext here as we want to not strip 'index' if it has an extension
const simpleSlug = simplifySlug(slugifyFilePath(fp as FilePath))
const joined = joinSegments(_stripSlashes(prefix), _stripSlashes(simpleSlug))
const trail = folderPath ? "/" : ""
const res = (_addRelativeToStart(joined) + trail + anchor) as RelativeURL
return res
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}
// resolve /a/b/c to ../..
export function pathToRoot(slug: FullSlug): RelativeURL {
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let rootPath = slug
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.split("/")
.filter((x) => x !== "")
.slice(0, -1)
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.map((_) => "..")
.join("/")
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if (rootPath.length === 0) {
rootPath = "."
}
return rootPath as RelativeURL
}
export function resolveRelative(current: FullSlug, target: FullSlug | SimpleSlug): RelativeURL {
const res = joinSegments(pathToRoot(current), simplifySlug(target as FullSlug)) as RelativeURL
return res
}
export function splitAnchor(link: string): [string, string] {
let [fp, anchor] = link.split("#", 2)
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anchor = anchor === undefined ? "" : "#" + slugAnchor(anchor)
return [fp, anchor]
}
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export function slugAnchor(anchor: string) {
return slug(anchor)
}
export function slugTag(tag: string) {
return tag
.split("/")
.map((tagSegment) => slug(tagSegment))
.join("/")
}
export function joinSegments(...args: string[]): string {
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return args.filter((segment) => segment !== "").join("/")
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}
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export function getAllSegmentPrefixes(tags: string): string[] {
const segments = tags.split("/")
const results: string[] = []
for (let i = 0; i < segments.length; i++) {
results.push(segments.slice(0, i + 1).join("/"))
}
return results
}
export interface TransformOptions {
strategy: "absolute" | "relative" | "shortest"
allSlugs: FullSlug[]
}
export function transformLink(src: FullSlug, target: string, opts: TransformOptions): RelativeURL {
let targetSlug = transformInternalLink(target)
if (opts.strategy === "relative") {
return targetSlug as RelativeURL
} else {
const folderTail = _isFolderPath(targetSlug) ? "/" : ""
const canonicalSlug = _stripSlashes(targetSlug.slice(".".length))
let [targetCanonical, targetAnchor] = splitAnchor(canonicalSlug)
if (opts.strategy === "shortest") {
// if the file name is unique, then it's just the filename
const matchingFileNames = opts.allSlugs.filter((slug) => {
const parts = slug.split("/")
const fileName = parts.at(-1)
return targetCanonical === fileName
})
// only match, just use it
if (matchingFileNames.length === 1) {
const targetSlug = matchingFileNames[0]
return (resolveRelative(src, targetSlug) + targetAnchor) as RelativeURL
}
}
// if it's not unique, then it's the absolute path from the vault root
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return (joinSegments(pathToRoot(src), canonicalSlug) + folderTail) as RelativeURL
}
}
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function _isFolderPath(fplike: string): boolean {
return (
fplike.endsWith("/") ||
_endsWith(fplike, "index") ||
_endsWith(fplike, "index.md") ||
_endsWith(fplike, "index.html")
)
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}
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function _endsWith(s: string, suffix: string): boolean {
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return s === suffix || s.endsWith("/" + suffix)
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}
function _trimSuffix(s: string, suffix: string): string {
if (_endsWith(s, suffix)) {
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s = s.slice(0, -suffix.length)
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}
return s
}
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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-z0-9]+$/)?.[0]
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}
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function _isRelativeSegment(s: string): boolean {
return /^\.{0,2}$/.test(s)
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}
export function _stripSlashes(s: string, onlyStripPrefix?: boolean): string {
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if (s.startsWith("/")) {
s = s.substring(1)
}
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if (!onlyStripPrefix && s.endsWith("/")) {
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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
}