Alek Ratzloff
6d503089e4
For some reason there doesn't appear to be a binary search function in Elixir's standard library, so this implements that. Signed-off-by: Alek Ratzloff <alekratz@gmail.com>
40 lines
988 B
Elixir
40 lines
988 B
Elixir
defmodule Omnibot.Util do
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def string_empty?(s), do: String.length(s) == 0
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def string_or_nil(s), do: if(string_empty?(s), do: nil, else: s)
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def now_unix, do: now_unix("Etc/UTC")
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def now_unix(tz), do: DateTime.now!(tz) |> DateTime.to_unix()
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@doc """
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Inserts a zero-width space character inside of a nickname so that it won't
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create a notification for that user.
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"""
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def denotify_nick(nick) do
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String.graphemes(nick) |> Enum.join("\u200b")
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end
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def binary_search([], _key) do
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nil
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end
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def binary_search([{key, value} | _], key) do
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{0, value}
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end
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@doc "Attempts to find to find the given key in a sorted associative array."
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def binary_search(list, key) do
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{head, tail} = Enum.split(list, trunc(length(list) / 2))
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[{mid, _} | _] = tail
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if key < mid do
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binary_search(head, key)
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else
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case binary_search(tail, key) do
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nil -> nil
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{index, item} -> {index + length(head), item}
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end
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end
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end
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end
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