Function isUnifiedDiffFormat

core/edit/lazy/unifiedDiffApply.ts:8–29

(diff: string)

 * 2. Contains valid diff content lines (starting with +, -, or space) which are not header lines
 */
export function isUnifiedDiffFormat(diff: string): boolean {
  const lines = diff.trim().split("\n");

  if (lines.length < 3) {
    return false;
  }

  let hasHunkHeader = false;
  let hasValidContent = false;

  for (const line of lines) {
    if (line.startsWith("---") || line.startsWith("+++")) {
      // ignore file headers - they are not required or useful
    } else if (line.match(/^@@ -\d+,?\d* \+\d+,?\d* @@/)) {
      hasHunkHeader = true;
    } else if (line.match(/^[+ -]/) || line === "") {
      hasValidContent = true;
    }
  }

  return hasHunkHeader && hasValidContent;
}

function extractBeforeLines(hunkLines: string[]): string[] {
  return hunkLines