Chunker is a file chunker.

FileSplit is a file chunker.

IsLess returns true if a is less than b.

NewFileReader returns a new FileReader object.

NewFileWriter returns a new FileWriter object.

NewIOReader retruns a new FileReader object.

NewIOWriter returns a new FileWriter object.

NewLines returns a new object of Lines.

NewMergeSorter returns a new MergeSorter object.

OsOpen is a copy of os.Open() as a dependency injection to ease testing.

FileReader is a line reader for the chunk file.

FileWriter is wrapper of file writer but with a buffer.

Lines holds a slice of string as a chunk of data with sort and save functionality.

MergeSorter merge-sorts the sorted chunk files.