Function findFrontmatterBounds

apps/vscode/src/frontmatter.ts:38–61

(
  text: string
)

 * Returns the line numbers and the YAML text between them, or null if not found.
 */
export function findFrontmatterBounds(
  text: string
): { startLine: number; endLine: number; yamlText: string } | null {
  const lines = text.split("\n");

  // Opening delimiter must be at the very first line
  if (lines.length === 0 || lines[0].trim() !== "---") {
    return null;
  }

  // Find closing delimiter
  for (let i = 1; i < lines.length; i++) {
    if (lines[i].trim() === "---") {
      const yamlLines = lines.slice(1, i);
      return {
        startLine: 0,
        endLine: i,
        yamlText: yamlLines.join("\n"),
      };
    }
  }

  return null; // Unclosed frontmatter
}

/**
 * Parse frontmatter from a markdown document string.