otp_version.ex
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otp_version.ex
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	# Pleroma: A lightweight social networking server
	# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
	# SPDX-License-Identifier: AGPL-3.0-only

	defmodule Pleroma.OTPVersion do
	@spec version() :: String.t() \| nil
	def version do
	# OTP Version https://erlang.org/doc/system_principles/versions.html#otp-version
	[
	Path.join(:code.root_dir(), "OTP_VERSION"),
	Path.join([:code.root_dir(), "releases", :erlang.system_info(:otp_release), "OTP_VERSION"])
	]
	\|> get_version_from_files()
	end

	@spec get_version_from_files([Path.t()]) :: String.t() \| nil
	def get_version_from_files([]), do: nil

	def get_version_from_files([path \| paths]) do
	if File.exists?(path) do
	path
	\|> File.read!()
	\|> String.replace(~r/\r\|\n\|\s/, "")
	else
	get_version_from_files(paths)
	end
	end
	end