Function closeOpenSyntax

src/lib/markdown.ts:72–102

(content: string)

}

function closeOpenSyntax(content: string): string {
  let result = content;

  // Detect open fence by counting fence-opening lines vs fence-closing lines.
  // A line that starts with ``` is a fence marker. Odd count = still open.
  const fenceLines = result.split('\n').filter(l => l.trim().startsWith('```'));
  const inFence = fenceLines.length % 2 === 1;

  // If we're inside a fence, close it so the parser renders what's there
  if (inFence) {
    result += '\n```';
    return result; // Don't mess with inline markers inside a code block
  }

  // Close open inline backtick (single `)
  // Count single backticks that are NOT part of triple backticks
  const withoutFences = result.replace(/```[\s\S]*?```/g, '').replace(/```/g, '');
  const singleTicks = (withoutFences.match(/(?<!\\)`/g) ?? []).length;
  if (singleTicks % 2 === 1) result += '`';

  // Close open bold **
  const boldCount = (result.match(/\*\*/g) ?? []).length;
  if (boldCount % 2 === 1) result += '**';

  // Close open italic * (excluding ** pairs)
  const withoutBold = result.replace(/\*\*/g, '');
  const italicCount = (withoutBold.match(/\*/g) ?? []).length;
  if (italicCount % 2 === 1) result += '*';

  return result;
}