Function createUnifiedDiff

core/nextEdit/context/diffFormatting.ts:48–81

(
  beforeContent: string,
  afterContent: string,
  filePath: string,
  contextLines: number,
  workspaceDir?: string,
)

};

const createUnifiedDiff = (
  beforeContent: string,
  afterContent: string,
  filePath: string,
  contextLines: number,
  workspaceDir?: string,
) => {
  const normalizedBefore = beforeContent.endsWith("\n")
    ? beforeContent
    : beforeContent + "\n";
  const normalizedAfter = afterContent.endsWith("\n")
    ? afterContent
    : afterContent + "\n";

  // Use relative path if workspace directory is provided
  let displayPath = filePath;
  if (workspaceDir && filePath.startsWith(workspaceDir)) {
    displayPath = filePath.slice(workspaceDir.length).replace(/^[\/]/, "");
  } else if (workspaceDir) {
    // Fallback to just the basename if we can't determine relative path
    displayPath = getUriPathBasename(filePath);
  }

  const patch = createPatch(
    displayPath,
    normalizedBefore,
    normalizedAfter,
    undefined,
    undefined,
    { context: contextLines },
  );

  return patch;
};

export const createBeforeAfterDiff = (
  beforeContent: string,