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birl

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Date / Time handling for Gleam

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birl src birl@instant.erl
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src/birl@instant.erl 

-module(birl@instant).

-compile(no_auto_import).



-export([now/0, compare/2, difference/2, add/2, subtract/2]).

-export_type([instant/0]).



-opaque instant() :: {instant, integer()}.



-spec now() -> instant().

now() ->

    _pipe = birl_ffi:monotonic_now(),

    {instant, _pipe}.



-spec compare(instant(), instant()) -> gleam@order:order().

compare(A, B) ->

    {instant, Ia} = A,

    {instant, Ib} = B,

    case Ia =:= Ib of

        true ->

            eq;



        false ->

            case Ia < Ib of

                true ->

                    lt;



                false ->

                    gt

            end

    end.



-spec difference(instant(), instant()) -> birl@duration:duration().

difference(A, B) ->

    {instant, Ia} = A,

    {instant, Ib} = B,

    {duration, Ib - Ia}.



-spec add(instant(), birl@duration:duration()) -> instant().

add(Value, Duration) ->

    {instant, Instant} = Value,

    {duration, Duration@1} = Duration,

    {instant, Instant + Duration@1}.



-spec subtract(instant(), birl@duration:duration()) -> instant().

subtract(Value, Duration) ->

    {instant, Instant} = Value,

    {duration, Duration@1} = Duration,

    {instant, Instant - Duration@1}.