fix($markdown): Snippets should allow spaces in file path (closes #1505) (#1517)

Author: nie7321

packages/@vuepress/markdown/__tests__/__snapshots__/snippet.spec.js.snap

@@ -1,5 +1,15 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`snippet import snipets when the file has a space in the file path 1`] = `
+<div class="highlight-lines">
+  <div class="highlighted">&nbsp;</div>
+  <div class="highlighted">&nbsp;</div>
+  <div class="highlighted">&nbsp;</div><br>
+</div>export default function () {
+// ..
+}
+`;
+
 exports[`snippet import snippet 1`] = `
 <pre><code class="language-js">export default function () {
   // ..

packages/@vuepress/markdown/__tests__/fragments/code-snippet-with-space-in-path.md

@@ -0,0 +1 @@
+<<< @/packages/@vuepress/markdown/__tests__/fragments/snippet with spaces.js {1-3}

packages/@vuepress/markdown/__tests__/fragments/snippet with spaces.js

@@ -0,0 +1,3 @@
+export default function () {
+  // ..
+}

packages/@vuepress/markdown/__tests__/snippet.spec.js

@@ -24,4 +24,10 @@ describe('snippet', () => {
     const output = mdH.render(input)
     expect(output).toMatchSnapshot()
   })
+
+  test('import snipets when the file has a space in the file path', () => {
+    const input = getFragment(__dirname, 'code-snippet-with-space-in-path.md')
+    const output = mdH.render(input)
+    expect(output).toMatchSnapshot()
+  })
 })

packages/@vuepress/markdown/lib/snippet.js

@@ -44,7 +44,7 @@ module.exports = function snippet (md, options = {}) {
     const start = pos + 3
     const end = state.skipSpacesBack(max, pos)
     const rawPath = state.src.slice(start, end).trim().replace(/^@/, root)
-    const filename = rawPath.split(/[{\s]/).shift()
+    const filename = rawPath.split(/{/).shift().trim()
     const meta = rawPath.replace(filename, '')
 
     state.line = startLine + 1