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Postgres sync engine. Sync little subsets of your Postgres data into local apps and services.
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lib/pg_interop/interval/iso8601_formatter.ex
defmodule PgInterop.Interval.Iso8601Formatter do
alias PgInterop.Interval
@hour 3_600_000_000
@minute 60_000_000
@second 1_000_000
@doc """
Return a human readable string representing the duration, formatted according
to ISO8601. Negative sections will be formatted accordingly, as does PG.
## Examples
iex> format(Interval.parse!("PT2S"))
"PT2S"
iex> format(Interval.parse!("PT2.0001S"))
"PT2.0001S"
iex> format(Interval.parse!("PT1M5S"))
"PT1M5S"
iex> format(Interval.parse!("PT1M5S"))
"PT1M5S"
iex> format(Interval.parse!("P45Y6M5DT21H12M34.590264S"))
"P45Y6M5DT21H12M34.590264S"
0-length interval is special-cased to render as "0S"
iex> format(%Interval{months: 0, days: 0, microseconds: 0})
"PT0S"
"""
def format(%Interval{} = interval), do: IO.iodata_to_binary(to_iodata(interval))
@doc false
def to_iodata(%Interval{months: 0, days: 0, microseconds: 0}), do: "PT0S"
def to_iodata(%Interval{months: months, days: days, microseconds: us}) do
[
?P,
format_months(months),
format_days(days),
format_time(us)
]
end
defp format_months(months),
do: [suffix_nonzero(div(months, 12), ?Y), suffix_nonzero(rem(months, 12), ?M)]
defp format_days(days), do: suffix_nonzero(days, ?D)
defp format_time(0), do: []
defp format_time(time),
do: [
?T,
suffix_nonzero(div(time, @hour), ?H),
suffix_nonzero(div(rem(time, @hour), @minute), ?M),
format_seconds(rem(time, @minute))
]
defp format_seconds(0), do: []
defp format_seconds(us) when rem(us, @second) == 0,
do: [Integer.to_charlist(div(us, @second)), ?S]
defp format_seconds(us), do: [Float.to_charlist(us / 100_000_0.0), ?S]
defp suffix_nonzero(0, _), do: []
defp suffix_nonzero(x, suffix), do: [Integer.to_charlist(x), suffix]
end