utils/src/path.ts
saberzero1 4dda81bc82
feat(path)!: lowercase slugs for Obsidian-parity case-insensitive matching
slugifyPath now lowercases its output, which cascades through
slugifyFilePath, slugTag, and transformInternalLink (all of which
funnel through _sluggify).

This matches Obsidian's case-insensitive link and tag matching:
[[MyNote]], [[mynote]], and [[MYNOTE]] all resolve to the slug
'my-note', and the tags #MyTag, #mytag, and #MYTAG collapse into a
single tag page.

BREAKING CHANGE: all generated URLs are now lowercase. Users
upgrading with mixed-case source filenames will see their URLs
change (e.g. /MyNote -> /my-note). Also eliminates silent data
loss on case-insensitive filesystems (macOS APFS, Windows NTFS)
where Apple.md and apple.md previously produced conflicting HTML
outputs that overwrote each other without warning.
2026-04-16 21:12:37 +02:00

333 lines
10 KiB
TypeScript

import { slug as slugAnchor } from "github-slugger";
import type { FilePath, FullSlug } from "@quartz-community/types";
export type { FilePath, FullSlug };
/** No '/index' ending, no file extension, can have trailing slash for folders. */
export type SimpleSlug = string & { _brand: "SimpleSlug" };
/** Starts with './' or '../', used for navigation. */
export type RelativeURL = string & { _brand: "RelativeURL" };
export interface TransformOptions {
strategy: "absolute" | "relative" | "shortest";
allSlugs: FullSlug[];
}
export function isFilePath(s: string): s is FilePath {
const validStart = !s.startsWith(".");
return validStart && _hasFileExtension(s);
}
export function isFullSlug(s: string): s is FullSlug {
const validStart = !(s.startsWith(".") || s.startsWith("/"));
const validEnding = !s.endsWith("/");
return validStart && validEnding && !_containsForbiddenCharacters(s);
}
export function isSimpleSlug(s: string): s is SimpleSlug {
const validStart = !(s.startsWith(".") || (s.length > 1 && s.startsWith("/")));
const validEnding = !endsWith(s, "index");
return validStart && !_containsForbiddenCharacters(s) && validEnding && !_hasFileExtension(s);
}
export function isRelativeURL(s: string): s is RelativeURL {
const validStart = /^\.{1,2}/.test(s);
const validEnding = !endsWith(s, "index");
return validStart && validEnding && ![".md", ".html"].includes(getFileExtension(s) ?? "");
}
export function isAbsoluteURL(s: string): boolean {
try {
new URL(s);
} catch {
return false;
}
return true;
}
export function simplifySlug(fp: FullSlug | string): SimpleSlug {
const res = stripSlashes(trimSuffix(fp, "index"), true);
return (res.length === 0 ? "/" : res) as SimpleSlug;
}
export function getFullSlug(window: Window): FullSlug {
const res = window.document.body.dataset.slug! as FullSlug;
return res;
}
export function getFullSlugFromUrl(): FullSlug {
let rawSlug = window.location.pathname;
if (rawSlug.endsWith("/")) rawSlug = rawSlug.slice(0, -1);
if (rawSlug.startsWith("/")) rawSlug = rawSlug.slice(1);
return rawSlug as FullSlug;
}
export function slugifyFilePath(fp: FilePath, excludeExt?: boolean): FullSlug {
fp = stripSlashes(fp) as FilePath;
const ext = getFileExtension(fp);
const withoutFileExt = fp.replace(new RegExp(ext + "$"), "");
const finalExt = excludeExt || [".md", ".html", undefined].includes(ext) ? "" : ext;
let slug = _sluggify(withoutFileExt);
if (endsWith(slug, "_index")) {
slug = slug.replace(/_index$/, "index");
}
// Obsidian "Folder Notes" convention (insideFolder storage): a file named the
// same as its parent folder is treated as the folder's landing page. Rewrite
// `folder/folder` → `folder/index` so every downstream consumer (trie, link
// resolver, simplifySlug, isFolderPath) sees the canonical Quartz slug shape
// and Just Works. A top-level single-segment slug is NOT rewritten — that
// represents Obsidian's `parentFolder` storage mode, which Quartz already
// routes as a regular top-level page.
const segments = slug.split("/");
if (segments.length >= 2 && segments[segments.length - 1] === segments[segments.length - 2]) {
segments[segments.length - 1] = "index";
slug = segments.join("/");
}
return (slug + (finalExt ?? "")) as FullSlug;
}
export function joinSegments(...args: string[]): string {
if (args.length === 0) {
return "";
}
let joined = args
.filter((segment) => segment !== "" && segment !== "/")
.map((segment) => stripSlashes(segment))
.join("/");
const first = args[0];
const last = args[args.length - 1];
if (first?.startsWith("/")) {
joined = "/" + joined;
}
if (last?.endsWith("/")) {
joined = joined + "/";
}
return joined;
}
export function resolvePath(to: string): string {
if (to.startsWith("/")) return to;
return "/" + to;
}
/** Read the base path injected at build time via `data-basepath` on `<body>`.
* Returns `""` for root deployments, e.g. `"/repository"` for subdirectory. */
export function getBasePath(): string {
if (typeof document === "undefined") return "";
return document.body?.dataset?.basepath ?? "";
}
/** Resolve a slug to an absolute URL path, prepending the site's base path.
* e.g. `resolveBasePath("features/Callouts")` → `"/repository/features/Callouts"` */
export function resolveBasePath(to: string, basePath?: string): string {
const base = basePath ?? getBasePath();
const slug = to.startsWith("/") ? to : "/" + to;
return base + slug;
}
export function endsWith(s: string, suffix: string): boolean {
return s === suffix || s.endsWith("/" + suffix);
}
export function trimSuffix(s: string, suffix: string): string {
if (endsWith(s, suffix)) {
s = s.slice(0, -suffix.length);
}
return s;
}
export function stripSlashes(s: string, onlyStripPrefix?: boolean): string {
if (s.startsWith("/")) {
s = s.substring(1);
}
if (!onlyStripPrefix && s.endsWith("/")) {
s = s.slice(0, -1);
}
return s;
}
export function getFileExtension(s: string): string | undefined {
return s.match(/\.[A-Za-z0-9]+$/)?.[0];
}
export function isFolderPath(fplike: string): boolean {
return (
fplike.endsWith("/") ||
endsWith(fplike, "index") ||
endsWith(fplike, "index.md") ||
endsWith(fplike, "index.html")
);
}
export function getAllSegmentPrefixes(path: string): string[] {
const segments = path.split("/");
const results: string[] = [];
for (let i = 0; i < segments.length; i++) {
results.push(segments.slice(0, i + 1).join("/"));
}
return results;
}
export function pathToRoot(slug: FullSlug): RelativeURL {
let rootPath = slug
.split("/")
.filter((x) => x !== "")
.slice(0, -1)
.map((_) => "..")
.join("/");
if (rootPath.length === 0) {
rootPath = ".";
}
return rootPath as RelativeURL;
}
export function resolveRelative(current: FullSlug, target: FullSlug | SimpleSlug): RelativeURL {
const res = joinSegments(pathToRoot(current), simplifySlug(target as FullSlug)) as RelativeURL;
return res;
}
export function splitAnchor(link: string): [string, string] {
const [fp, anchor] = link.split("#", 2);
if (fp!.endsWith(".pdf")) {
return [fp!, anchor === undefined ? "" : `#${anchor}`];
}
const slugged = anchor === undefined ? "" : "#" + slugAnchor(anchor);
return [fp!, slugged];
}
export function slugTag(tag: string): string {
return tag
.split("/")
.map((tagSegment) => _sluggify(tagSegment))
.join("/");
}
export function transformInternalLink(link: string): RelativeURL {
const [fplike, anchor] = splitAnchor(decodeURI(link));
const folderPath = isFolderPath(fplike);
const segments = fplike.split("/").filter((x) => x.length > 0);
const prefix = segments.filter(_isRelativeSegment).join("/");
const fp = segments.filter((seg) => !_isRelativeSegment(seg) && seg !== "").join("/");
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;
}
export function transformLink(src: FullSlug, target: string, opts: TransformOptions): RelativeURL {
const targetSlug = transformInternalLink(target);
if (opts.strategy === "relative") {
return targetSlug as RelativeURL;
} else {
// When src is a folder page (e.g. "Compendium/Spells" backed by index.md),
// the browser serves it at "/Compendium/Spells/" with a trailing slash.
// pathToRoot needs the "/index" suffix to compute the correct depth.
const effectiveSrc =
!endsWith(src, "index") && opts.allSlugs.includes(`${src}/index` as FullSlug)
? (`${src}/index` as FullSlug)
: src;
const folderTail = isFolderPath(targetSlug) ? "/" : "";
const canonicalSlug = stripSlashes(targetSlug.slice(".".length));
const [targetCanonical, targetAnchor] = splitAnchor(canonicalSlug);
if (opts.strategy === "shortest") {
const isMultiSegment = targetCanonical.includes("/");
const isFolderTarget = isFolderPath(targetSlug);
const matchingFileNames = opts.allSlugs.filter((slug) => {
if (isMultiSegment) {
// Multi-segment partial path: match by suffix
if (slug === targetCanonical || slug.endsWith("/" + targetCanonical)) {
return true;
}
// Folder targets have "/index" stripped — also match the "/index" variant
if (isFolderTarget) {
const withIndex = targetCanonical + "/index";
return slug === withIndex || slug.endsWith("/" + withIndex);
}
return false;
}
const parts = slug.split("/");
const fileName = parts.at(-1);
return targetCanonical === fileName;
});
if (matchingFileNames.length === 1) {
const matchedSlug = matchingFileNames[0]!;
return (resolveRelative(effectiveSrc, matchedSlug) + targetAnchor) as RelativeURL;
}
}
return (joinSegments(pathToRoot(effectiveSrc), canonicalSlug) + folderTail) as RelativeURL;
}
}
/**
* Slugify a file path for use as an href.
* Replaces whitespace→hyphens, &→-and-, %→-percent, removes ? and #, and
* lowercases the result so that link matching is case-insensitive (matching
* Obsidian's link-resolution semantics). Operates per segment so directory
* separators are preserved.
*/
export function slugifyPath(s: string): string {
return s
.split("/")
.map((segment) =>
segment
.replace(/\s/g, "-")
.replace(/&/g, "-and-")
.replace(/%/g, "-percent")
.replace(/\?/g, "")
.replace(/#/g, "")
.toLowerCase(),
)
.join("/")
.replace(/\/$/, "");
}
/** @internal */
function _sluggify(s: string): string {
return slugifyPath(s);
}
function _containsForbiddenCharacters(s: string): boolean {
return s.includes(" ") || s.includes("#") || s.includes("?") || s.includes("&");
}
function _hasFileExtension(s: string): boolean {
return getFileExtension(s) !== undefined;
}
function _isRelativeSegment(s: string): boolean {
return /^\.{0,2}$/.test(s);
}
function _addRelativeToStart(s: string): string {
if (s === "") {
s = ".";
}
if (!s.startsWith(".")) {
s = joinSegments(".", s);
}
return s;
}