Signature type doesn't have timezone property

[sergei-dyshel]

impl<'a> TryFrom<git2::Signature<'a>> for Signature {
  type Error = crate::Error;

  fn try_from(value: git2::Signature<'a>) -> Result<Self, Self::Error> {
    let name = std::str::from_utf8(value.name_bytes())?.to_string();
    let email = std::str::from_utf8(value.email_bytes())?.to_string();
    let timestamp = value.when().seconds();
    Ok(Self { name, email, timestamp })
  }
}

Looks like Signature only has seconds() part of the timestamp and not the offset (timezone).

AT the same time

pub struct RebaseOperation {
  #[napi(js_name = "type")]
  /// The type of rebase operation
  pub kind: Option<RebaseOperationType>,
  /// The commit ID being cherry-picked. This will be populated for all
  /// operations except those of type `GIT_REBASE_OPERATION_EXEC`.
  pub id: String,
  ///The executable the user has requested be run.  This will only
  /// be populated for operations of type `Exec`.
  pub exec: Option<String>,
}

requires adding committer info when replaying commits during rebase. This means we can't use original committer Signature since it lacks timezone.

Example in typescript code:

const rebase = repo.rebase(null, repo.getAnnotatedCommit(repo.getCommit(process.argv[2])), null);
let op: RebaseOperation | null;
for (;;) {
  op = rebase.next();
  if (op === null) break;

  const commit = repo.getCommit(op.id);
  rebase.commit({
    committer: {
      name: commit.committer().name,
      email: commit.committer().email,
      timeOptions: { timestamp: commit.committer().timestamp, offset: 0 }, // No way to get correct offset!
    },
  });
}
rebase.finish();