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defmodule Elita.Vault do |
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def save(name, history) do |
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vsn = bump(name) |
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:ets.insert(:elita_vault, {name, vsn, history}) |
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:ok |
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end |
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def load(name) do |
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wrap(read(name)) |
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end |
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def restore(name) do |
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load(name) |
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end |
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defp bump(name) do |
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add(settle(check(name))) |
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end |
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defp wrap(nil), do: [] |
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defp wrap(val), do: val |
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defp settle(nil), do: 0 |
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defp settle(val), do: val |
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defp add(val), do: val + 1 |
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defp check(name) do |
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found(lookup(name)) |
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end |
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defp read(name) do |
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hist(lookup(name)) |
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end |
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defp lookup(name) do |
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:ets.lookup(:elita_vault, name) |
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end |
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defp found([{_name, vsn, _history}]), do: vsn |
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defp found([]), do: nil |
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defp hist([{_name, _vsn, history}]), do: history |
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defp hist([]), do: nil |
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end |