fix markdown rendering: protect code blocks/escapes, move links before bold/italic, add task lists and H2-H6 support

src/markdown.ts

@@ -1,40 +1,65 @@
 export function renderMarkdown(text: string): string {
-  // Strip code fences (``` and ```language) — we're already in a terminal
-  let result = text.replace(/^```\w*\n?/gm, "")
+  // Extract fenced code blocks before anything else
+  const codeBlocks: string[] = []
+  let result = text.replace(/^```\w*\n([\s\S]*?)^```\s*$/gm, (_, content) => {
+    codeBlocks.push(content)
+    return `\x00CODEBLOCK${codeBlocks.length - 1}\x00`
+  })
 
-  // Extract code spans first so their contents aren't processed as bold/italic
+  // Extract backslash escapes so they aren't processed as markdown
+  const escapes: string[] = []
+  result = result.replace(/\\([\\`*_~\[\]()#>!-])/g, (_, ch) => {
+    escapes.push(ch)
+    return `\x00ESC${escapes.length - 1}\x00`
+  })
+
+  // Extract code spans so their contents aren't processed as bold/italic
   const codeSpans: string[] = []
   result = result.replace(/`([^`]+)`/g, (_, code) => {
     codeSpans.push(code)
     return `\x00CODE${codeSpans.length - 1}\x00`
   })
 
+  // Links: [text](url) → OSC 8 terminal hyperlink, underlined blue
+  // Must run before H1/bold/italic so ANSI `[` chars don't confuse the link regex
+  result = result.replace(/(?<!!)\[([^\]]+)\]\(([^)]+)\)/g, (_, text, href) => {
+    const url = href.replace(/\s+"[^"]*"$/, "") // strip optional title
+    return `\x1b]8;;${url}\x07\x1b[4;38;5;75m${text}\x1b[24;39m\x1b]8;;\x07`
+  })
+
   // H1: # Header → bold+italic+underline
   result = result.replace(/^# (.+)$/gm, "\x1b[1;3;4m$1\x1b[22;23;24m")
 
   // H2/H3: ## Header / ### Header → bold
-  result = result.replace(/^#{2,3} (.+)$/gm, "\x1b[1m$1\x1b[22m")
+  result = result.replace(/^#{2,6} (.+)$/gm, "\x1b[1m$1\x1b[22m")
 
   // Blockquotes: > text → dim+italic
   result = result.replace(/^> (.+)$/gm, "\x1b[2;3m$1\x1b[22;23m")
 
+  // Bare blockquote lines: > with no text
+  result = result.replace(/^>\s*$/gm, "")
+
+  // Task lists: - [x] → ✓ green, - [ ] → ○ dim
+  result = result.replace(/^(\s*)[-*] \[x\] (.+)$/gm, "$1\x1b[32m✓\x1b[39m $2")
+  result = result.replace(/^(\s*)[-*] \[ \] (.+)$/gm, "$1\x1b[2m☐\x1b[22m $2")
+
   // Bold: **text**
   result = result.replace(/\*\*(.+?)\*\*/g, "\x1b[1m$1\x1b[22m")
 
   // Italic: *text*
   result = result.replace(/\*(.+?)\*/g, "\x1b[3m$1\x1b[23m")
 
-  // Links: [text](url) → OSC 8 terminal hyperlink, underlined blue
-  result = result.replace(/(?<!!)\[([^\]]+)\]\(([^)]+)\)/g, (_, text, href) => {
-    const url = href.replace(/\s+"[^"]*"$/, "") // strip optional title
-    return `\x1b]8;;${url}\x07\x1b[4;38;5;75m${text}\x1b[24;39m\x1b]8;;\x07`
-  })
-
   // Restore code spans as light blue
   result = result.replace(/\x00CODE(\d+)\x00/g, (_, i) => {
     return `\x1b[38;5;147m${codeSpans[parseInt(i)]}\x1b[39m`
   })
 
+  // Restore backslash escapes as literal characters
+  result = result.replace(/\x00ESC(\d+)\x00/g, (_, i) => escapes[parseInt(i)])
+
+  // Restore fenced code blocks as plain text
+  result = result.replace(/\x00CODEBLOCK(\d+)\x00/g, (_, i) => codeBlocks[parseInt(i)])
+
   // Breathe: add blank line before list starts when preceded by non-empty text
   const lines = result.split("\n")
   for (let i = lines.length - 1; i > 0; i--) {