Markdown: parse partial links as they are streaming (#256)

Author: platypii

src/components/Markdown/Markdown.test.tsx

@@ -80,6 +80,14 @@ describe('Markdown', () => {
     expect(getByRole('link').getAttribute('href')).toBe('https://hyperparam.app')
   })
 
+  it('renders a partial link', () => {
+    const text = 'Check out [Hyp](https://hyper'
+    const { getByText, queryByText } = render(<Markdown text={text} />)
+    expect(getByText('Hyp')).toBeDefined()
+    expect(queryByText('hyper')).toBeNull()
+    expect(getByText('Hyp').tagName).toBe('A')
+  })
+
   it('renders multiple links in one line', () => {
     const text = 'Check out [Hyp](https://hyperparam.app) on [GitHub](https://github.com/hyparam).'
     const { getAllByRole, getByText } = render(<Markdown text={text} />)

src/components/Markdown/Markdown.tsx

@@ -302,7 +302,10 @@ function parseInlineRecursive(text: string, stop?: string): [Token[], number] {
         i++ // skip '('
         const endParen = text.indexOf(')', i)
         if (endParen === -1) {
-          tokens.push({ type: 'text', content: text.slice(start, i) })
+          // No closing ")": assume in-flight href
+          const href = text.slice(i).trim()
+          i = text.length // consume to EOI so loop terminates
+          tokens.push({ type: 'link', href, children: linkTextTokens })
           continue
         }
         const href = text.slice(i, endParen).trim()