feat: improve task note markdown editor

frontend/src/lib/task-utils.ts

@@ -17,6 +17,38 @@ const escapeHtml = (value: string) =>
     .replace(/"/g, '"')
     .replace(/'/g, ''')
 
+export type MarkdownFormat = 'heading' | 'bold' | 'italic' | 'bullet' | 'ordered' | 'task' | 'link' | 'code' | 'codeblock' | 'quote'
+
+export function applyMarkdownFormat(value: string, start: number, end: number, format: MarkdownFormat) {
+  const selected = value.slice(start, end)
+  const replace = (replacement: string, selectionStart: number, selectionEnd: number) => ({
+    value: value.slice(0, start) + replacement + value.slice(end),
+    start: start + selectionStart,
+    end: start + selectionEnd,
+  })
+  const wrap = (before: string, after = before, fallback = '文字') => {
+    const content = selected || fallback
+    return replace(`${before}${content}${after}`, before.length, before.length + content.length)
+  }
+  const prefixLines = (prefix: string, fallback = '列表项') => {
+    const content = selected || fallback
+    const replacement = content.split('\n').map((line) => `${prefix}${line}`).join('\n')
+    return replace(replacement, prefix.length, replacement.length)
+  }
+  if (format === 'heading') return prefixLines('## ', '标题')
+  if (format === 'bold') return wrap('**')
+  if (format === 'italic') return wrap('*')
+  if (format === 'bullet') return prefixLines('- ')
+  if (format === 'ordered') return prefixLines('1. ')
+  if (format === 'task') return prefixLines('- [ ] ')
+  if (format === 'link') return selected
+    ? replace(`[${selected}](https://)`, 1, 1 + selected.length)
+    : replace('[链接文字](https://)', 1, 5)
+  if (format === 'code') return wrap('`', '`', '代码')
+  if (format === 'codeblock') return wrap('```\n', '\n```', '代码')
+  return prefixLines('> ', '引用')
+}
+
 const renderInline = (value: string) => {
   let out = escapeHtml(value)
   out = out.replace(/`([^`]+)`/g, '<code>$1</code>')
@@ -32,17 +64,45 @@ const renderInline = (value: string) => {
 export function renderMarkdown(markdown = '') {
   const lines = markdown.replace(/\r\n/g, '\n').split('\n')
   const html: string[] = []
-  let inList = false
+  let listType: 'ul' | 'ol' | null = null
+  let inCode = false
+  let codeLanguage = ''
+  const codeLines: string[] = []
 
   const closeList = () => {
-    if (inList) {
-      html.push('</ul>')
-      inList = false
+    if (listType) {
+      html.push(`</${listType}>`)
+      listType = null
     }
   }
+  const openList = (type: 'ul' | 'ol') => {
+    if (listType === type) return
+    closeList()
+    html.push(`<${type}>`)
+    listType = type
+  }
 
   for (const raw of lines) {
     const line = raw.trimEnd()
+    const fence = line.match(/^```([\w-]*)\s*$/)
+    if (fence) {
+      closeList()
+      if (inCode) {
+        const languageClass = codeLanguage ? ` class="language-${escapeHtml(codeLanguage)}"` : ''
+        html.push(`<pre><code${languageClass}>${escapeHtml(codeLines.join('\n'))}</code></pre>`)
+        codeLines.length = 0
+        codeLanguage = ''
+        inCode = false
+      } else {
+        inCode = true
+        codeLanguage = fence[1]
+      }
+      continue
+    }
+    if (inCode) {
+      codeLines.push(raw)
+      continue
+    }
     if (!line.trim()) {
       closeList()
       continue
@@ -53,18 +113,29 @@ export function renderMarkdown(markdown = '') {
     } else if (line.startsWith('## ')) {
       closeList()
       html.push(`<h2>${renderInline(line.slice(3))}</h2>`)
+    } else if (line.startsWith('> ')) {
+      closeList()
+      html.push(`<blockquote>${renderInline(line.slice(2))}</blockquote>`)
+    } else if (/^\d+\. /.test(line)) {
+      openList('ol')
+      html.push(`<li>${renderInline(line.replace(/^\d+\. /, ''))}</li>`)
+    } else if (/^[-*] \[[ xX]\] /.test(line)) {
+      openList('ul')
+      const checked = /^[-*] \[[xX]\] /.test(line)
+      html.push(`<li class="task-list-item"><input type="checkbox" disabled${checked ? ' checked' : ''}>${renderInline(line.replace(/^[-*] \[[ xX]\] /, ''))}</li>`)
     } else if (/^[-*] /.test(line)) {
-      if (!inList) {
-        html.push('<ul>')
-        inList = true
-      }
+      openList('ul')
       html.push(`<li>${renderInline(line.slice(2))}</li>`)
+    } else if (/^(---|\*\*\*)$/.test(line.trim())) {
+      closeList()
+      html.push('<hr>')
     } else {
       closeList()
       html.push(`<p>${renderInline(line)}</p>`)
     }
   }
   closeList()
+  if (inCode) html.push(`<pre><code>${escapeHtml(['```' + codeLanguage, ...codeLines].join('\n'))}</code></pre>`)
   return html.join('')
 }