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-defmodule SData do
- @moduledoc """
- Utility functions
-
- Compare functions are functions that compares stored items and provides a total order.
- They must return:
- - `:after` if the first argument is more recent
- - `:duplicate` if the two items are the same
- - `:before` if the first argument is older
- These functions must only return :duplicate for equal items.
- """
-
- @doc """
- Calculate the hash of an Erlang term by first converting it to its
- binary representation.
- """
- def term_hash(term, algo \\ :sha256) do
- :crypto.hash(algo, (:erlang.term_to_binary term))
- end
-
- @doc"""
- Compare function for arbitrary terms using the Erlang order
- """
- def cmp_term(a, b) do
- cond do
- a > b -> :after
- a < b -> :before
- a == b -> :duplicate
- end
- end
-
- @doc"""
- Compare function for timestamped strings
- """
- def cmp_ts_str({ts1, str1}, {ts2, str2}) do
- cond do
- ts1 > ts2 -> :after
- ts1 < ts2 -> :before
- str1 > str2 -> :after
- str1 < str2 -> :before
- true -> :duplicate
- end
- end
-
- @doc"""
- Merge function for nils
- """
- def merge_true(true, true), do: true
-end