Function applyEdits

apps/opencode-plugin/plan-edits.ts:31–49

(existingLines: string[], edits: PlanEdit[])

 *     state BEFORE any edits in this batch (offsets are adjusted internally)
 */
export function applyEdits(existingLines: string[], edits: PlanEdit[]): string[] {
  const sorted = [...edits].sort((a, b) => a.start - b.start);
  const lines = [...existingLines];
  let offset = 0;

  for (const edit of sorted) {
    const start = edit.start - 1 + offset;
    const end = edit.end != null
      ? edit.end + offset
      : lines.length;

    const newLines = edit.content ? edit.content.split("\n") : [];
    const removedCount = end - start;
    lines.splice(start, removedCount, ...newLines);
    offset += newLines.length - removedCount;
  }

  return lines;
}

/**
 * Validate a batch of edits against the current file state.