69 lines
1.6 KiB
Elixir
Executable File
69 lines
1.6 KiB
Elixir
Executable File
defmodule Discordirc.ByteSplit do
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@moduledoc """
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Module that splits text by bytes, Unicode Aware.
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"""
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# use 510 to \r\n newline in mind
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@irclen 510
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@doc """
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split a string into a number `bytes`, optionally subtracting a number of `hold` bytes for prefix/suffix
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"""
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def byte_split(str, bytes, hold \\ 0) do
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case byte_size(str) do
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n when is_integer(n) and n > bytes ->
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str
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|> String.split("")
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|> Enum.chunk_while(
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[],
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fn ele, acc ->
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if Enum.join(Enum.reverse([ele | acc])) |> byte_size() > bytes - hold do
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{:cont, Enum.reverse(acc), [ele]}
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else
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{:cont, [ele | acc]}
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end
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end,
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fn
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[] -> {:cont, []}
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acc -> {:cont, Enum.reverse(acc), []}
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end
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)
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|> Enum.map(&Enum.join(&1))
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_ ->
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str
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end
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end
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def ircsplit(str, pfxlen) do
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str
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|> String.split(" ")
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|> Enum.chunk_while(
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[],
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fn ele, acc ->
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if Enum.join(Enum.reverse([ele | acc]), " ") |> byte_size() > @irclen - pfxlen do
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{:cont, Enum.reverse(acc), [ele]}
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else
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{:cont, [ele | acc]}
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end
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end,
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fn
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[] -> {:cont, []}
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acc -> {:cont, Enum.reverse(acc), []}
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end
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)
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|> Enum.map(fn x -> Enum.join(x, " ") end)
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|> Enum.map(fn x ->
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case byte_size(x) do
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n when is_integer(n) and n > @irclen - pfxlen ->
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byte_split(x, @irclen - pfxlen)
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_ ->
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x
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end
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end)
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|> List.flatten()
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|> Enum.filter(&(&1 !== ""))
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end
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end
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