Function computeFileModifications

app/utils/diff.ts:17–52

(files: FileMap, modifiedFiles: Map<string, string>)

type FileModifications = Record<string, ModifiedFile>;

export function computeFileModifications(files: FileMap, modifiedFiles: Map<string, string>) {
  const modifications: FileModifications = {};

  let hasModifiedFiles = false;

  for (const [filePath, originalContent] of modifiedFiles) {
    const file = files[filePath];

    if (file?.type !== 'file') {
      continue;
    }

    const unifiedDiff = diffFiles(filePath, originalContent, file.content);

    if (!unifiedDiff) {
      // files are identical
      continue;
    }

    hasModifiedFiles = true;

    if (unifiedDiff.length > file.content.length) {
      // if there are lots of changes we simply grab the current file content since it's smaller than the diff
      modifications[filePath] = { type: 'file', content: file.content };
    } else {
      // otherwise we use the diff since it's smaller
      modifications[filePath] = { type: 'diff', content: unifiedDiff };
    }
  }

  if (!hasModifiedFiles) {
    return undefined;
  }

  return modifications;
}

/**
 * Computes a diff in the unified format. The only difference is that the header is omitted