weewx-proxy/lib/weewx_proxy/utils.ex
2023-06-06 16:41:34 +02:00

47 lines
1.1 KiB
Elixir

defmodule WeewxProxy.Utils do
@spec parse_integer(String.t()) :: integer() | nil
def parse_integer(str) when is_binary(str) and byte_size(str) > 0 do
case Integer.parse(str) do
{int, ""} -> int
_error -> nil
end
end
def parse_integer(_), do: nil
@spec parse_float(String.t() | integer() | float()) :: float() | nil
def parse_float(str) when is_binary(str) and byte_size(str) > 0 do
case Float.parse(str) do
{float, _rem} -> float
_error -> nil
end
end
def parse_float(float) when is_float(float), do: float
def parse_float(int) when is_integer(int), do: int / 1.0
def parse_float(_), do: nil
@spec utc_timestamp :: non_neg_integer()
def utc_timestamp do
:os.system_time(:seconds)
end
@spec utc_offset_string(String.t()) :: String.t()
def utc_offset_string(tz) do
{:ok, dt} = DateTime.now(tz)
offset = dt.utc_offset
if offset > 0 do
"+#{offset}"
else
to_string(offset)
end
end
@spec append_string(String.t(), String.t()) :: String.t()
def append_string(str, append) do
str <> append
end
end