vfs

pub(open) trait FileSystem {
  async fn mkdir_p(Self, String) -> Unit raise VfsError
  async fn write_file(Self, String, Bytes) -> Unit raise VfsError
  async fn write_string(Self, String, String) -> Unit raise VfsError
  async fn remove_file(Self, String) -> Unit raise VfsError
  async fn remove_dir(Self, String) -> Unit raise VfsError
}

pub(open) trait Flushable {
  async fn flush(Self) -> Unit raise VfsError
  async fn sync(Self) -> Unit raise VfsError
  fn dirty(Self) -> Bool
}

pub(open) trait ReadableFileSystem {
  async fn read_file(Self, String) -> Bytes raise VfsError
  async fn readdir(Self, String) -> Array[String] raise VfsError
  async fn is_dir(Self, String) -> Bool
  async fn is_file(Self, String) -> Bool
}

pub(open) trait Snapshottable {
  async fn export_snapshot(Self) -> Snapshot
  async fn replace_snapshot(Self, Snapshot) -> Unit raise VfsError
}

pub suberror VfsError {
  VfsError(String)
}

pub struct Snapshot {
  dirs : Array[String]
  files : Array[SnapshotFile]
} derive(Eq, 
@moonbitlang/core/debug.Debug
Debug)

pub struct SnapshotFile {
  path : String
  data : Bytes
} derive(Eq, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) enum VfsEvent {
  Write(String)
  Remove(String)
  Mkdir(String)
} derive(Eq, 
@moonbitlang/core/debug.Debug
Debug)

fn snapshot(dirs : Array[String], files : Array[SnapshotFile]) -> Snapshot

fn snapshot_file(path : String, data : Bytes) -> SnapshotFile

fn vfs_error(msg : String) -> VfsError