Function buildEditDiffLines

apps/kimi-web/src/lib/toolDiff.ts:25–42

(tool: { name: string; arg: string })

 * (replace_all, append), or when the inputs are too large to diff cheaply.
 */
export function buildEditDiffLines(tool: { name: string; arg: string }): DiffViewLine[] | null {
  const kind = normalizeToolName(tool.name);
  if (kind !== 'edit' && kind !== 'write') return null;
  const d = parseArg(tool.arg);
  if (!d) return null;
  if (kind === 'edit') {
    if (d.replace_all === true) return null;
    const before = typeof d.old_string === 'string' ? d.old_string : undefined;
    const after = typeof d.new_string === 'string' ? d.new_string : undefined;
    if (before === undefined || after === undefined) return null;
    return buildDiffLines(before, after);
  }
  // Write only reports the new content (and whether it appended); the client
  // cannot tell a new file from an overwrite of an existing one. A from-empty
  // diff would show an overwrite as "all additions, no deletions", which is
  // misleading — so fall back to the tool output for every Write.
  return null;
}

/** Pull the file path out of an Edit/Write tool call's input, if present. */
export function extractEditPath(arg: string): string | undefined {