Allow use of filenames in exportPathMap (vercel#2973)

* allow use of filenames in exportPathMap

* add link test and handling for file paths when flattening links for export

* add note about exporting file paths to readme.md

lib/router/index.js

@@ -101,7 +101,12 @@ export function _rewriteUrlForNextExport (url) {
   let [path, qs] = url.split('?')
   path = path.replace(/\/$/, '')
 
-  let newPath = `${path}/`
+  let newPath = path
+  // Append a trailing slash if this path does not have an extension
+  if (!/\.[^/]+\/?$/.test(path)) {
+    newPath = `${path}/`
+  }
+
   if (qs) {
     newPath = `${newPath}?${qs}`
   }

readme.md

@@ -1064,6 +1064,7 @@ module.exports = {
     return {
       '/': { page: '/' },
       '/about': { page: '/about' },
+      '/readme.md': { page: '/readme' },
       '/p/hello-nextjs': { page: '/post', query: { title: 'hello-nextjs' } },
       '/p/learn-nextjs': { page: '/post', query: { title: 'learn-nextjs' } },
       '/p/deploy-nextjs': { page: '/post', query: { title: 'deploy-nextjs' } }
@@ -1072,6 +1073,8 @@ module.exports = {
 }
 ```
 
+> Note that if the path ends with a directory, it will be exported as `/dir-name/index.html`, but if it ends with an extension, it will be exported as the specified filename, e.g. `/readme.md` above. If you use a file extension other than `.html`, you may need to set the `Content-Type` header to `text/html` when serving this content.
+
 In that, you specify what are the pages you need to export as static HTML.
 
 Then simply run these commands:

server/export.js

@@ -2,7 +2,7 @@ import del from 'del'
 import cp from 'recursive-copy'
 import mkdirp from 'mkdirp-then'
 import walk from 'walk'
-import { resolve, join, dirname, sep } from 'path'
+import { extname, resolve, join, dirname, sep } from 'path'
 import { existsSync, readFileSync, writeFileSync } from 'fs'
 import getConfig from './config'
 import { renderToHTML } from './render'
@@ -96,7 +96,14 @@ export default async function (dir, options, configuration) {
     const req = { url: path }
     const res = {}
 
-    const htmlFilename = path === '/' ? 'index.html' : `${path}${sep}index.html`
+    let htmlFilename = `${path}${sep}index.html`
+    if (extname(path) !== '') {
+      // If the path has an extension, use that as the filename instead
+      htmlFilename = path
+    } else if (path === '/') {
+      // If the path is the root, just use index.html
+      htmlFilename = 'index.html'
+    }
     const baseDir = join(outDir, dirname(htmlFilename))
     const htmlFilepath = join(outDir, htmlFilename)
 

test/integration/static/next.config.js

@@ -9,7 +9,8 @@ module.exports = {
       '/dynamic-imports': { page: '/dynamic-imports' },
       '/dynamic': { page: '/dynamic', query: { text: 'cool dynamic text' } },
       '/dynamic/one': { page: '/dynamic', query: { text: 'next export is nice' } },
-      '/dynamic/two': { page: '/dynamic', query: { text: 'zeit is awesome' } }
+      '/dynamic/two': { page: '/dynamic', query: { text: 'zeit is awesome' } },
+      '/file-name.md': { page: '/dynamic', query: { text: 'this file has an extension' } }
     }
   }
 }

test/integration/static/pages/index.js

@@ -44,6 +44,12 @@ export default () => (
       >
         <a id='with-hash'>With Hash</a>
       </Link>
+      <Link
+        href='/dynamic?text=this+file+has+an+extension'
+        as='/file-name.md'
+      >
+        <a id='path-with-extension'>Path with extension</a>
+      </Link>
       <Link href='/level1'>
         <a id='level1-home-page'>Level1 home page</a>
       </Link>

test/integration/static/test/ssr.js

@@ -1,5 +1,6 @@
 /* global describe, it, expect */
 import { renderViaHTTP } from 'next-test-utils'
+import cheerio from 'cheerio'
 
 export default function (context) {
   describe('Render via SSR', () => {
@@ -8,6 +9,15 @@ export default function (context) {
       expect(html).toMatch(/This is the home page/)
     })
 
+    it('should render links correctly', async () => {
+      const html = await renderViaHTTP(context.port, '/')
+      const $ = cheerio.load(html)
+      const dynamicLink = $('#dynamic-1').prop('href')
+      const filePathLink = $('#path-with-extension').prop('href')
+      expect(dynamicLink).toEqual('/dynamic/one/')
+      expect(filePathLink).toEqual('/file-name.md')
+    })
+
     it('should render a page with getInitialProps', async() => {
       const html = await renderViaHTTP(context.port, '/dynamic')
       expect(html).toMatch(/cool dynamic text/)
@@ -20,7 +30,12 @@ export default function (context) {
 
     it('should render pages with dynamic imports', async() => {
       const html = await renderViaHTTP(context.port, '/dynamic-imports')
-      expect(html).toMatch(/Welcome to dynamic imports./)
+      expect(html).toMatch(/Welcome to dynamic imports/)
+    })
+
+    it('should render paths with extensions', async() => {
+      const html = await renderViaHTTP(context.port, '/file-name.md')
+      expect(html).toMatch(/this file has an extension/)
     })
 
     it('should give empty object for query if there is no query', async() => {