feat(shared): support relative links in normalizeRoutePath

packages/shared/src/utils/index.ts

@@ -2,6 +2,7 @@ export * from './dedupeHead.js'
 export * from './ensureLeadingSlash.js'
 export * from './ensureEndingSlash.js'
 export * from './formatDateString.js'
+export * from './inferRoutePath.js'
 export * from './isLinkExternal.js'
 export * from './isLinkHttp.js'
 export * from './isLinkWithProtocol.js'

packages/shared/src/utils/inferRoutePath.ts

@@ -0,0 +1,26 @@
+/**
+ * Infer route path according to the given (markdown file) path
+ */
+export const inferRoutePath = (path: string): string => {
+  // if the pathname is empty or ends with `/`, return as is
+  if (!path || path.endsWith('/')) return path
+
+  // convert README.md to index.html
+  let routePath = path.replace(/(^|\/)README.md$/i, '$1index.html')
+
+  // convert /foo/bar.md to /foo/bar.html
+  if (routePath.endsWith('.md')) {
+    routePath = routePath.substring(0, routePath.length - 3) + '.html'
+  }
+  // convert /foo/bar to /foo/bar.html
+  else if (!routePath.endsWith('.html')) {
+    routePath = routePath + '.html'
+  }
+
+  // convert /foo/index.html to /foo/
+  if (routePath.endsWith('/index.html')) {
+    routePath = routePath.substring(0, routePath.length - 10)
+  }
+
+  return routePath
+}

packages/shared/src/utils/normalizeRoutePath.ts

@@ -1,30 +1,21 @@
+import { inferRoutePath } from './inferRoutePath.js'
+
+const FAKE_HOST = 'http://.'
+
 /**
  * Normalize the given path to the final route path
  */
-export const normalizeRoutePath = (path: string): string => {
-  // split pathname and query/hash
-  const [pathname, ...queryAndHash] = path.split(/(\?|#)/)
-
-  // if the pathname is empty or ends with `/`, return as is
-  if (!pathname || pathname.endsWith('/')) return path
+export const normalizeRoutePath = (path: string, current?: string): string => {
+  if (!path.startsWith('/') && current) {
+    // the relative path should be resolved against the current path
+    const loc = current.slice(0, current.lastIndexOf('/'))
 
-  // convert README.md to index.html
-  let routePath = pathname.replace(/(^|\/)README.md$/i, '$1index.html')
+    const { pathname, search, hash } = new URL(`${loc}/${path}`, FAKE_HOST)
 
-  // convert /foo/bar.md to /foo/bar.html
-  if (routePath.endsWith('.md')) {
-    routePath = routePath.substring(0, routePath.length - 3) + '.html'
-  }
-  // convert /foo/bar to /foo/bar.html
-  else if (!routePath.endsWith('.html')) {
-    routePath = routePath + '.html'
+    return inferRoutePath(pathname) + search + hash
   }
 
-  // convert /foo/index.html to /foo/
-  if (routePath.endsWith('/index.html')) {
-    routePath = routePath.substring(0, routePath.length - 10)
-  }
+  const [pathname, ...queryAndHash] = path.split(/(\?|#)/)
 
-  // add query and hash back
-  return routePath + queryAndHash.join('')
+  return inferRoutePath(pathname) + queryAndHash.join('')
 }

packages/shared/tests/inferRoutePath.spec.ts

@@ -0,0 +1,62 @@
+import { describe, expect, it } from 'vitest'
+import { inferRoutePath } from '../src/index.js'
+
+const testCases = [
+  // absolute index
+  ['/', '/'],
+  ['/README.md', '/'],
+  ['/readme.md', '/'],
+  ['/index.md', '/'],
+  ['/index.html', '/'],
+  ['/index', '/'],
+  ['/foo/', '/foo/'],
+  ['/foo/README.md', '/foo/'],
+  ['/foo/readme.md', '/foo/'],
+  ['/foo/index.md', '/foo/'],
+  ['/foo/index.html', '/foo/'],
+  ['/foo/index', '/foo/'],
+  ['README.md', 'index.html'],
+  ['readme.md', 'index.html'],
+  ['index.md', 'index.html'],
+  ['index.html', 'index.html'],
+  ['index', 'index.html'],
+
+  // absolute non-index
+  ['/foo', '/foo.html'],
+  ['/foo.md', '/foo.html'],
+  ['/foo.html', '/foo.html'],
+  ['/foo/bar', '/foo/bar.html'],
+  ['/foo/bar.md', '/foo/bar.html'],
+  ['/foo/bar.html', '/foo/bar.html'],
+
+  // relative index without current
+  ['foo/', 'foo/'],
+  ['foo/README.md', 'foo/'],
+  ['foo/readme.md', 'foo/'],
+  ['foo/index.md', 'foo/'],
+  ['foo/index.html', 'foo/'],
+  ['foo/index', 'foo/'],
+
+  // relative non index without current
+  ['foo', 'foo.html'],
+  ['foo.md', 'foo.html'],
+  ['foo.html', 'foo.html'],
+  ['foo/bar', 'foo/bar.html'],
+  ['foo/bar.md', 'foo/bar.html'],
+  ['foo/bar.html', 'foo/bar.html'],
+
+  // unexpected corner cases
+  ['', ''],
+  ['.md', '.html'],
+  ['foo/.md', 'foo/.html'],
+  ['/.md', '/.html'],
+  ['/foo/.md', '/foo/.html'],
+]
+
+describe('should normalize clean paths correctly', () => {
+  testCases.forEach(([path, expected]) =>
+    it(`"${path}" -> "${expected}"`, () => {
+      expect(inferRoutePath(path)).toBe(expected)
+    }),
+  )
+})