export type GitObjectFormat = "sha1" | "sha256";

export const FULL_GIT_OBJECT_ID_RE = /^(?:[0-9a-f]{40}|[0-9a-f]{64})$/;

export function isFullGitObjectId(value: unknown): value is string {
  return typeof value === "string" && FULL_GIT_OBJECT_ID_RE.test(value);
}

export function gitObjectIdWidth(format: GitObjectFormat): 40 | 64 {
  return format === "sha1" ? 40 : 64;
}