Function listChangedFiles

packages/ci/src/lib/git.ts:39–88

(
  refs: {
    base: string;
    head: string;
  },
  git = simpleGit(),
)

}

export async function listChangedFiles(
  refs: {
    base: string;
    head: string;
  },
  git = simpleGit(),
): Promise<ChangedFiles> {
  const statuses: DiffNameStatus[] = [
    DiffNameStatus.ADDED,
    DiffNameStatus.COPIED,
    DiffNameStatus.MODIFIED,
    DiffNameStatus.RENAMED,
  ];
  const { files } = await git.diffSummary([
    refs.base,
    refs.head,
    `--diff-filter=${statuses.join('')}`,
    '--find-renames',
    '--find-copies',
  ]);

  const entries = await Promise.all(
    files
      .filter(({ binary }) => !binary)
      .map(({ file }) => {
        const rename = parseFileRename(file);
        if (rename) {
          return { file: rename.curr, originalFile: rename.prev };
        }
        return { file };
      })
      .map(async ({ file, originalFile }) => {
        const diff = await git.diff([
          '--unified=0',
          refs.base,
          refs.head,
          '--',
          file,
          ...(originalFile ? [originalFile] : []),
        ]);
        const lineChanges = parseDiff(diff);
        return [
          file,
          { ...(originalFile && { originalFile }), lineChanges },
        ] as const;
      }),
  );

  return Object.fromEntries(entries);
}

function parseFileRename(file: string): { prev: string; curr: string } | null {
  const partialRenameMatch = file.match(/^(.*){(.*) => (.*)}(.*)$/);